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#1 2020-07-01 15:38:38

willianholtz
Member
Registered: 2017-09-23
Posts: 52

What is the simplest way to make a DHCP server?

Guys, I need to make a DHCP server, I was using Debian, but as I am an Arch user Some time ago, I decided to port to it.
Starting with a clean installation, what is the best way to make the DHCP server work?

The wiki didn't help me at all, it just doesn't connect when I plug the cable into the computer, following the steps there.

A long time ago, I used netctl, but even he is not willing to collaborate. Can you help me from scratch to make a server with Arch?

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#2 2020-07-01 15:46:01

ewaller
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From: Pasadena, CA
Registered: 2009-07-13
Posts: 20,334

Re: What is the simplest way to make a DHCP server?

The dhcpd service is what I use.  https://wiki.archlinux.org/index.php/Dhcpd
You will have to configure it to serve the  subnet you want.  And, you will need to have an address in that subnet assigned to one of your NICs.

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
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#3 2020-07-01 15:46:18

seth
Member
Registered: 2012-09-03
Posts: 60,972

Re: What is the simplest way to make a DHCP server?

https://wiki.archlinux.org/index.php/Ro … S_and_DHCP

it just doesn't connect … I used netctl

Are you sure you want to "make a DHCP server"?

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#4 2020-07-01 15:47:23

merlock
Member
Registered: 2018-10-30
Posts: 258

Re: What is the simplest way to make a DHCP server?

Try looking into dnsmasq

I run it on my RPi for DHCP.

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#5 2020-07-01 15:55:05

willianholtz
Member
Registered: 2017-09-23
Posts: 52

Re: What is the simplest way to make a DHCP server?

ewaller wrote:

The dhcpd service is what I use.  https://wiki.archlinux.org/index.php/Dhcpd
You will have to configure it to serve the  subnet you want.  And, you will need to have an address in that subnet assigned to one of your NICs.

I was using this one, but even following it, it doesn't send the IP to the machine (yes, I use a script with iptables to forward the address)
@ewaller How did you do it? Can you help me?



I'm not sure what you're talking about, but lol (google translator, sorry sad)

@merlock: What exactly did you do?

Last edited by willianholtz (2020-07-01 15:55:52)

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#6 2020-07-01 16:11:06

seth
Member
Registered: 2012-09-03
Posts: 60,972

Re: What is the simplest way to make a DHCP server?

It sounded as if you were trying to receive an IP (ie. this was a client issue)

Does the server listen on port 67/547 (check nmap)
What does your dhcpd config look like?
Also

ip a; ip r; sudo iptables -nvL

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#7 2020-07-01 16:47:39

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 20,334

Re: What is the simplest way to make a DHCP server?

As you are using a translator, I assume English is not your primary language.  As such I will ask a couple questions to be sure we are talking about the same thing.

Are you trying to use your computer to listen for requests for IP address from other computers and to provide those computers with a unique address ?   This allows other computers to join the network controlled by your computer   This is a DHCP server.

Or, is your computer trying to ask another computer (or router) for an IP address so that your computer may join that network?

Most people do not need to run a server.  I do because I develop IoT devices that need to be provided an address  when they start.  One of the wired networks on this computer can be configured to provide those IoT devices addresses when they start up while keeping them on an isolated LAN.

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
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#8 2020-07-01 16:49:50

willianholtz
Member
Registered: 2017-09-23
Posts: 52

Re: What is the simplest way to make a DHCP server?

EDIT:
@ewaller
Sorry I hadn't seen the message, and yes, I want a computer (server) to distribute IP's to a network, I think it's a DHCP server, isn't it? lol


seth wrote:

It sounded as if you were trying to receive an IP (ie. this was a client issue)

Does the server listen on port 67/547 (check nmap)
What does your dhcpd config look like?
Also

ip a; ip r; sudo iptables -nvL

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp8s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:24:e8:de:00:6f brd ff:ff:ff:ff:ff:ff
    inet 139.96.30.100/24 scope global enp8s0
       valid_lft forever preferred_lft forever
    inet6 fe80::224:e8ff:fede:6f/64 scope link
       valid_lft forever preferred_lft forever
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:26:5e:22:98:75 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.105/24 brd 192.168.0.255 scope global dynamic noprefixroute wlan0
       valid_lft 6949sec preferred_lft 6049sec
    inet6 fe80::89:aab9:a86c:5f2a/64 scope link
       valid_lft forever preferred_lft forever
default via 192.168.0.1 dev wlan0 proto dhcp src 192.168.0.105 metric 303
139.96.30.0/24 dev enp8s0 proto kernel scope link src 139.96.30.100
192.168.0.0/24 dev wlan0 proto dhcp scope link src 192.168.0.105 metric 303
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target     prot opt in     out     source               destination

Last edited by willianholtz (2020-07-01 17:03:24)

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#9 2020-07-01 17:14:48

seth
Member
Registered: 2012-09-03
Posts: 60,972

Re: What is the simplest way to make a DHCP server?

Please edit the post and wrap the output in code tags, https://bbs.archlinux.org/help.php#bbcode

There're no iptable rules at all, 2 NICS, the traffic defaults over wifi - do you want to create a dhcp server for the 139.96.30.0/24 subnet (your wired ethernet)?

You forgot to post the dhcpd.conf and to answer whether the interface is listening on the dhcp ports (you can check this locally w/ ss or netstat, but nmap results from a client in the subnet are the most relevant information right now)

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#10 2020-07-01 17:32:41

willianholtz
Member
Registered: 2017-09-23
Posts: 52

Re: What is the simplest way to make a DHCP server?

Ifconfig:

enp8s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 00:24:e8:de:00:6f  txqueuelen 1000  (Ethernet)
        RX packets 217  bytes 58722 (57.3 KiB)
        RX errors 0  dropped 46  overruns 0  frame 0
        TX packets 116  bytes 14720 (14.3 KiB)
        TX errors 2  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 13  bytes 1895 (1.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 13  bytes 1895 (1.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.105  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::89:aab9:a86c:5f2a  prefixlen 64  scopeid 0x20<link>
        ether 00:26:5e:22:98:75  txqueuelen 1000  (Ethernet)
        RX packets 414735  bytes 415114653 (395.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 14055
        TX packets 368868  bytes 27873717 (26.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 18

/etc/dhcpd.conf

option domain-name-servers 8.8.8.8, 8.8.4.4;
option subnet-mask 255.255.255.0;
option routers 139.96.30.100;
subnet 139.96.30.0 netmask 255.255.255.0 {
  range 139.96.30.150 139.96.30.250;
}

I created it as it is on the wiki
/etc/systemd/system/dhcpd4@.service

                                  
[Unit]
Description=IPv4 DHCP server on %I
Wants=network.target
After=network-pre.target
Before=network.target

[Service]
Type=forking
PIDFile=/run/dhcpd4.pid
ExecStart=/usr/bin/dhcpd -4 -q -pf /run/dhcpd4.pid %I
KillSignal=SIGINT

[Install]
WantedBy=multi-user.target

       

I started the interface

systemctl enable dhcpd4@enp8s0.service
systemctl start dhcpd4@enp8s0.service

NETSTAT

netstat
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 pacarch:56250           ce-in-f188.1e10:hpvroom ESTABLISHED
tcp        0      0 pacarch:48848           bbs.archlinux.org:https ESTABLISHED
udp        0      0 pacarch:48355           gru06s30-in-f14.1:https ESTABLISHED
udp        0      0 pacarch:36575           gru14s20-in-f14.1:https ESTABLISHED
Active UNIX domain sockets (w/o servers)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  3      [ ]         DGRAM                    11037    /run/systemd/notify
unix  10     [ ]         DGRAM                    11076    /run/systemd/journal/dev-log
unix  6      [ ]         DGRAM                    11084    /run/systemd/journal/socket
unix  2      [ ]         DGRAM                    20148    /run/user/1000/systemd/notify
unix  2      [ ]         DGRAM                    74705    /var/run/wpa_supplicant/wlan0
unix  3      [ ]         SEQPACKET  CONNECTED     25268    @00004
unix  3      [ ]         SEQPACKET  CONNECTED     25266    @00003
unix  3      [ ]         STREAM     CONNECTED     40440    
unix  3      [ ]         STREAM     CONNECTED     23289    
unix  3      [ ]         STREAM     CONNECTED     21561    
unix  3      [ ]         DGRAM                    75791    
unix  3      [ ]         STREAM     CONNECTED     25379    
unix  3      [ ]         STREAM     CONNECTED     21428    /run/user/1000/bus
unix  3      [ ]         STREAM     CONNECTED     38306    
unix  3      [ ]         STREAM     CONNECTED     23265    /run/user/1000/pulse/native
unix  3      [ ]         STREAM     CONNECTED     22877    @/tmp/.ICE-unix/662
unix  3      [ ]         STREAM     CONNECTED     20402    
unix  3      [ ]         STREAM     CONNECTED     40441    
unix  3      [ ]         DGRAM                    12622    
unix  3      [ ]         STREAM     CONNECTED     23291    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     21465    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     75795    
unix  3      [ ]         STREAM     CONNECTED     25358    
unix  3      [ ]         STREAM     CONNECTED     20422    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     18666    
unix  3      [ ]         STREAM     CONNECTED     41306    
unix  3      [ ]         STREAM     CONNECTED     38994    
unix  3      [ ]         STREAM     CONNECTED     34883    /run/user/1000/pulse/native
unix  3      [ ]         STREAM     CONNECTED     95007    
unix  3      [ ]         STREAM     CONNECTED     22906    
unix  3      [ ]         STREAM     CONNECTED     22575    /run/systemd/journal/stdout
unix  2      [ ]         DGRAM                    74751    
unix  3      [ ]         STREAM     CONNECTED     36332    
unix  3      [ ]         STREAM     CONNECTED     25357    
unix  3      [ ]         STREAM     CONNECTED     21422    
unix  3      [ ]         STREAM     CONNECTED     39173    
unix  3      [ ]         STREAM     CONNECTED     21571    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     20372    /run/dbus/system_bus_socket
unix  3      [ ]         DGRAM                    12623    
unix  3      [ ]         STREAM     CONNECTED     23054    /run/user/1000/bus
unix  2      [ ]         DGRAM                    21315    
unix  2      [ ]         DGRAM                    21061    
unix  3      [ ]         STREAM     CONNECTED     24498    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     21479    
unix  3      [ ]         STREAM     CONNECTED     39118    
unix  3      [ ]         STREAM     CONNECTED     22890    
unix  3      [ ]         STREAM     CONNECTED     22597    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     20388    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     40689    
unix  2      [ ]         DGRAM                    23301    
unix  3      [ ]         STREAM     CONNECTED     21472    
unix  3      [ ]         DGRAM                    75789    
unix  3      [ ]         SEQPACKET  CONNECTED     25384    
unix  3      [ ]         STREAM     CONNECTED     20349    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     39117    
unix  3      [ ]         STREAM     CONNECTED     20434    
unix  3      [ ]         STREAM     CONNECTED     20371    
unix  3      [ ]         STREAM     CONNECTED     21960    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     21277    
unix  3      [ ]         DGRAM                    75851    
unix  3      [ ]         STREAM     CONNECTED     25465    
unix  3      [ ]         STREAM     CONNECTED     20351    /run/user/1000/bus
unix  3      [ ]         STREAM     CONNECTED     39113    
unix  3      [ ]         STREAM     CONNECTED     20429    
unix  3      [ ]         STREAM     CONNECTED     21490    /run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     23089    
unix  3      [ ]         STREAM     CONNECTED     21462    
unix  3      [ ]         STREAM     CONNECTED     75797    
unix  3      [ ]         STREAM     CONNECTED     26711    
unix  3      [ ]         SEQPACKET  CONNECTED     25373    
unix  3      [ ]         STREAM     CONNECTED     21480    
unix  3      [ ]         STREAM     CONNECTED     38299    
unix  3      [ ]         STREAM     CONNECTED     39172    
unix  3      [ ]         STREAM     CONNECTED     22876    
unix  3      [ ]         STREAM     CONNECTED     20394    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     23053    
unix  3      [ ]         STREAM     CONNECTED     21477    /run/user/1000/bus
unix  3      [ ]         DGRAM                    75852    
unix  3      [ ]         SEQPACKET  CONNECTED     25489    
unix  3      [ ]         STREAM     CONNECTED     21501    
unix  3      [ ]         STREAM     CONNECTED     38300    
unix  3      [ ]         STREAM     CONNECTED     39111    
unix  3      [ ]         STREAM     CONNECTED     22725    
unix  3      [ ]         STREAM     CONNECTED     95006    
unix  2      [ ]         DGRAM                    18268    
unix  3      [ ]         STREAM     CONNECTED     23090    /run/user/1000/bus
unix  3      [ ]         STREAM     CONNECTED     20206    /run/systemd/journal/stdout
unix  3      [ ]         DGRAM                    75790    
unix  3      [ ]         STREAM     CONNECTED     26710    
unix  3      [ ]         SEQPACKET  CONNECTED     25372    
unix  3      [ ]         STREAM     CONNECTED     21429    
unix  3      [ ]         STREAM     CONNECTED     39103    
unix  3      [ ]         STREAM     CONNECTED     23264    
unix  3      [ ]         STREAM     CONNECTED     22612    
unix  3      [ ]         STREAM     CONNECTED     20400    /run/user/1000/bus
unix  3      [ ]         STREAM     CONNECTED     40438    
unix  3      [ ]         STREAM     CONNECTED     38921    
unix  3      [ ]         STREAM     CONNECTED     22911    /run/user/1000/bus
unix  3      [ ]         DGRAM                    75798    
unix  3      [ ]         STREAM     CONNECTED     36333    
unix  3      [ ]         STREAM     CONNECTED     24499    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     21430    /run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     39110    
unix  3      [ ]         STREAM     CONNECTED     34882    
unix  2      [ ]         DGRAM                    22893    
unix  3      [ ]         STREAM     CONNECTED     22889    /run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     40688    
unix  2      [ ]         DGRAM                    12620    
unix  3      [ ]         SEQPACKET  CONNECTED     25263    
unix  3      [ ]         STREAM     CONNECTED     21287    
unix  3      [ ]         STREAM     CONNECTED     96671    
unix  3      [ ]         DGRAM                    75792    
unix  3      [ ]         STREAM     CONNECTED     25380    
unix  3      [ ]         STREAM     CONNECTED     21424    
unix  3      [ ]         STREAM     CONNECTED     18591    
unix  3      [ ]         STREAM     CONNECTED     39102    
unix  3      [ ]         STREAM     CONNECTED     22728    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     20401    
unix  3      [ ]         STREAM     CONNECTED     40439    
unix  3      [ ]         STREAM     CONNECTED     21562    /run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     22910    
unix  3      [ ]         STREAM     CONNECTED     21476    
unix  3      [ ]         STREAM     CONNECTED     75796    
unix  3      [ ]         STREAM     CONNECTED     27036    
unix  3      [ ]         STREAM     CONNECTED     25361    /run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     20392    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     18593    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     38307    
unix  3      [ ]         STREAM     CONNECTED     39114    
unix  3      [ ]         STREAM     CONNECTED     20430    /run/user/1000/bus
unix  3      [ ]         STREAM     CONNECTED     20393    
unix  3      [ ]         STREAM     CONNECTED     22905    
unix  3      [ ]         STREAM     CONNECTED     21464    /run/systemd/journal/stdout
unix  3      [ ]         DGRAM                    75788    
unix  3      [ ]         STREAM     CONNECTED     27035    
unix  3      [ ]         STREAM     CONNECTED     25360    
unix  3      [ ]         STREAM     CONNECTED     20385    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     38995    
unix  3      [ ]         STREAM     CONNECTED     21506    /run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     20387    
unix  3      [ ]         STREAM     CONNECTED     22587    
unix  3      [ ]         STREAM     CONNECTED     18854    /run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     23292    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     21288    
unix  3      [ ]         DGRAM                    75799    
unix  3      [ ]         STREAM     CONNECTED     25330    
unix  3      [ ]         STREAM     CONNECTED     21427    
unix  3      [ ]         STREAM     CONNECTED     18669    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     41212    
unix  3      [ ]         STREAM     CONNECTED     22722    
unix  3      [ ]         STREAM     CONNECTED     20403    
unix  3      [ ]         STREAM     CONNECTED     23288    
unix  3      [ ]         STREAM     CONNECTED     21463    
unix  3      [ ]         STREAM     CONNECTED     96672    
unix  3      [ ]         STREAM     CONNECTED     75794    
unix  3      [ ]         STREAM     CONNECTED     25329    
unix  2      [ ]         DGRAM                    21431    
unix  3      [ ]         STREAM     CONNECTED     41305    
unix  3      [ ]         STREAM     CONNECTED     20426    
unix  2      [ ]         DGRAM                    20398    
unix  2      [ ]         DGRAM                    22577    
unix  3      [ ]         STREAM     CONNECTED     18274    
unix  3      [ ]         STREAM     CONNECTED     21959    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     21473    @/tmp/.X11-unix/X0
unix  3      [ ]         DGRAM                    75793    
unix  3      [ ]         SEQPACKET  CONNECTED     25385    
unix  3      [ ]         STREAM     CONNECTED     21509    
unix  3      [ ]         STREAM     CONNECTED     41213    
unix  3      [ ]         STREAM     CONNECTED     22891    /run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     22613    @/tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     20399    
unix  3      [ ]         STREAM     CONNECTED     95349    
unix  3      [ ]         STREAM     CONNECTED     38955    
unix  3      [ ]         STREAM     CONNECTED     36690    
unix  3      [ ]         STREAM     CONNECTED     25449    
unix  3      [ ]         STREAM     CONNECTED     18845    
unix  3      [ ]         STREAM     CONNECTED     39224    
unix  3      [ ]         STREAM     CONNECTED     18892    
unix  3      [ ]         STREAM     CONNECTED     36764    
unix  3      [ ]         STREAM     CONNECTED     25551    
unix  3      [ ]         STREAM     CONNECTED     25662    @/tmp/.X11-unix/X0
unix  2      [ ]         DGRAM                    22231    
unix  3      [ ]         STREAM     CONNECTED     18887    
unix  3      [ ]         STREAM     CONNECTED     25460    
unix  3      [ ]         STREAM     CONNECTED     18833    /run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     18889    
unix  3      [ ]         STREAM     CONNECTED     20031    
unix  3      [ ]         STREAM     CONNECTED     38960    
unix  3      [ ]         STREAM     CONNECTED     25452    
unix  3      [ ]         STREAM     CONNECTED     39249    
unix  3      [ ]         STREAM     CONNECTED     95350    
unix  3      [ ]         STREAM     CONNECTED     25550    
unix  3      [ ]         STREAM     CONNECTED     25444    
unix  3      [ ]         STREAM     CONNECTED     39180    
unix  3      [ ]         STREAM     CONNECTED     80412    @/tmp/.ICE-unix/662
unix  3      [ ]         STREAM     CONNECTED     18890    
unix  3      [ ]         STREAM     CONNECTED     21569    /run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     18884    /run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     36552    
unix  3      [ ]         STREAM     CONNECTED     25394    
unix  3      [ ]         STREAM     CONNECTED     39290    
unix  3      [ ]         STREAM     CONNECTED     24886    /run/user/1000/kded5CnfVoy.1.slave-socket
unix  3      [ ]         STREAM     CONNECTED     36767    
unix  3      [ ]         STREAM     CONNECTED     25559    
unix  3      [ ]         STREAM     CONNECTED     25443    
unix  3      [ ]         STREAM     CONNECTED     80411    
unix  3      [ ]         DGRAM                    75597    
unix  2      [ ]         DGRAM                    21576    
unix  3      [ ]         STREAM     CONNECTED     26174    
unix  3      [ ]         SEQPACKET  CONNECTED     25495    
unix  3      [ ]         STREAM     CONNECTED     25464    
unix  3      [ ]         STREAM     CONNECTED     39223    
unix  3      [ ]         STREAM     CONNECTED     95975    
unix  2      [ ]         DGRAM                    20034    
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Active AX.25 sockets
Dest       Source     Device  State        Vr/Vs    Send-Q  Recv-Q

I'm using my notebook for testing, a while ago I used it to forward an IP to my PS4 and it worked, but now it won't sad

Last edited by willianholtz (2020-07-01 21:26:45)

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#11 2020-07-01 20:13:45

loqs
Member
Registered: 2014-03-06
Posts: 18,268

Re: What is the simplest way to make a DHCP server?

What is the status of the service?

systemctl status dhcpd4@enp8s0.service

Please note quote tags are not code tags.

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#12 2020-07-01 20:22:25

seth
Member
Registered: 2012-09-03
Posts: 60,972

Re: What is the simplest way to make a DHCP server?

"code", not "quote", please edit your post (there's a link in the lower right corner)

netstat -tulpen

From your notebook run

ip a; sudo nmap --script broadcast-dhcp-discover

I'm using my notebook for testing, a while ago I used it to forward an IP to my PS4 and it worked

Kannst Du bitte kurz erläutern, was das Ziel des Setups ist?
Du hast das WLAN im 192.168.0.0/24 Segment, es bezieht eine IP via DHCP, verm. von Deinem Router?

Ist der Plan, die PS4 über ethernet und das WLAN des Servers an den Router und darüber ins Internet zu kriegen?
Dann wolltest Du nämlich vermutlich eine https://wiki.archlinux.org/index.php/Network_bridge
Wie sind PC und PS4 denn verbunden? Crosslink cable, dummer switch oder ein weiterer Router?

Oder sollen PS4 und Arch-Server in einem isolierten Subnetz hängen (um zB. PS4 gegen PC zu spielen)?

Unabhängig davon kannst Du übrigens der PS4 eine statische IP geben, https://portforward.com/networking/static-ip-ps4/
Wichtig ist, daß die physisch verbundenen NICs im selben Subnetz agieren (dh. wenn die PS4 irgendwie mit dem Kabelgebunden ethernet verbunden ist, muß sie auch im 139.96.30.0/24 Netz sein)

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#13 2020-07-01 21:36:32

willianholtz
Member
Registered: 2017-09-23
Posts: 52

Re: What is the simplest way to make a DHCP server?

seth wrote:

"code", not "quote", please edit your post (there's a link in the lower right corner)

netstat -tulpen

From your notebook run

ip a; sudo nmap --script broadcast-dhcp-discover

I'm using my notebook for testing, a while ago I used it to forward an IP to my PS4 and it worked

Kannst Du bitte kurz erläutern, was das Ziel des Setups ist?
Du hast das WLAN im 192.168.0.0/24 Segment, es bezieht eine IP via DHCP, verm. von Deinem Router?

Ist der Plan, die PS4 über ethernet und das WLAN des Servers an den Router und darüber ins Internet zu kriegen?
Dann wolltest Du nämlich vermutlich eine https://wiki.archlinux.org/index.php/Network_bridge
Wie sind PC und PS4 denn verbunden? Crosslink cable, dummer switch oder ein weiterer Router?

Oder sollen PS4 und Arch-Server in einem isolierten Subnetz hängen (um zB. PS4 gegen PC zu spielen)?

Unabhängig davon kannst Du übrigens der PS4 eine statische IP geben, https://portforward.com/networking/static-ip-ps4/
Wichtig ist, daß die physisch verbundenen NICs im selben Subnetz agieren (dh. wenn die PS4 irgendwie mit dem Kabelgebunden ethernet verbunden ist, muß sie auch im 139.96.30.0/24 Netz sein)

Is that German? woow I'm Brazilian lol!
So, in my tests I just want to take the internet from my notebook to my PS4. But the goal is to create a linux server to manage IP's on a network and configure squid to block some inappropriate sites.

Then you ask me: "why not use Debian or another distro?" Because I don't like these distros, I think Arch is more up-to-date and more secure (to a certain extent).

As far as I know, to configure an internet server with a DHCP network, you need to specify the IP of a network card, and in the dhcpd.conf configuration, specify which IP's will be used, and what are the "ranges" used by that network! As described on this site, easy and practical! But it looks like Arch isn't doing that.

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#14 2020-07-01 21:55:28

loqs
Member
Registered: 2014-03-06
Posts: 18,268

Re: What is the simplest way to make a DHCP server?

You like arch because it is more modern but use deprecated commands ifconfig replaced by ip and netstat replaced by ss.
You also did not include the state of the service or the other requested outputs.

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#15 2020-07-01 22:00:19

seth
Member
Registered: 2012-09-03
Posts: 60,972

Re: What is the simplest way to make a DHCP server?

Sorry, I assumed your name was "Willi Anholtz" - sounded German enough.
The link explains a dhcpd setup, like the link to the arch wiki ewaller posted.

Aside the oustanding command outputs of the last few posts:
- Is the notebook the archlinux device or is this an extra server?
- Is the archlinux device physically connected to the PS4? How? (Dumb switch, another router or a crosslink cable)

Internet sharing is detailed here, https://wiki.archlinux.org/index.php/Internet_sharing - your iptables don't match that
As for squid, it's "just" a proxy. You can circumvent it by just not using it. If it's not on the filtered machine, your router will have to redirect all traffic on http and ftp ports through it.

@loqs

seth invited that and wrote:

you can check this locally w/ ss or netstat

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#16 2020-07-01 22:19:55

merlock
Member
Registered: 2018-10-30
Posts: 258

Re: What is the simplest way to make a DHCP server?

I've been using a pi-hole for 3 years now, and when I installed it, was interested in its' use of dnsmasq's DHCP server capabilities.

I needed a bit more fine-tuning than what pi-hole does out-of-the-box, so I made a drop-in config file (for dnsmasq) just for the DHCP server.  Works like a champ.

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#17 2020-07-01 22:54:47

willianholtz
Member
Registered: 2017-09-23
Posts: 52

Re: What is the simplest way to make a DHCP server?

I discovered the missing details, just typed dhcpd in the terminal and it worked!

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#18 2020-07-01 23:04:04

loqs
Member
Registered: 2014-03-06
Posts: 18,268

Re: What is the simplest way to make a DHCP server?

What were the missing details?
Edit:
You can get dhcpd to work from the console what about using the service file?

Last edited by loqs (2020-07-01 23:07:14)

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#19 2020-07-01 23:20:12

willianholtz
Member
Registered: 2017-09-23
Posts: 52

Re: What is the simplest way to make a DHCP server?

Come on, I did the following steps:

1 - I downloaded new .iso from Arch Linux
2 - I did the procedure to put a fixed IP

# ip link set up dev eth0
# ip addr add 139.96.30.100/24 dev eth0

3 - I edited the dhcpd.conf file

option domain-name-servers 8.8.8.8, 8.8.4.4;
option subnet-mask 255.255.255.0;
option routers 139.96.30.100;
subnet 139.96.30.0 netmask 255.255.255.0 {
  range 139.96.30.150 139.96.30.250;
}

4 - I created the dhcpd4@.service file (I don't know if you need it, but I did)
in /etc/systemd/system/dhcpd4@.service

[Unit]
Description=IPv4 DHCP server on %I
Wants=network.target
After=network.target

[Service]
Type=forking
PIDFile=/run/dhcpd4.pid
ExecStart=/usr/bin/dhcpd -4 -q -pf /run/dhcpd4.pid %I
KillSignal=SIGINT

[Install]
WantedBy=multi-user.target

Only the 4 steps work, it sends the IP to the client machine, but there are 6 steps I had to follow
And of course, I started the dhcpd process.

5 - I created a route for iptables releases the internet for the client

pacman -S iptables
touch /etc/iptables/iptables.rules

echo "1" > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o enp0s3 -j MASQUERADE

6 - I created a script to automate all of this at boot

And that, now all client machines work and get an IP of the range that I specified in dhcpd.conf.

Last edited by willianholtz (2020-07-01 23:21:23)

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#20 2020-07-01 23:36:46

loqs
Member
Registered: 2014-03-06
Posts: 18,268

Re: What is the simplest way to make a DHCP server?

Would steps 5 and 6 be needed if dhcpd was bound to the same interface that the DHCP requests were received on?
Edit:
I mean just to obtain a DHCP lease not to perform internet connection sharing.

Last edited by loqs (2020-07-01 23:41:06)

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#21 2020-07-01 23:40:29

willianholtz
Member
Registered: 2017-09-23
Posts: 52

Re: What is the simplest way to make a DHCP server?

loqs wrote:

Would steps 5 and 6 be needed if dhcpd was bound to the same interface that the DHCP requests were received on?

It seems so, because only then can you send signal to another network!

I'm sorry if I'm wrong!

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#22 2020-07-02 03:53:06

fukawi2
Ex-Administratorino
From: .vic.au
Registered: 2007-09-28
Posts: 6,231
Website

Re: What is the simplest way to make a DHCP server?

5 is definitely not required for a DHCP server - a DHCP server doesn't pass any traffic through it, it just hands out packets with lease details to any other host that asks for it. Hence no need for ip_forward or NAT MASQUERADE.

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#23 2020-07-02 06:44:24

seth
Member
Registered: 2012-09-03
Posts: 60,972

Re: What is the simplest way to make a DHCP server?

willianholtz wrote:

Only the 4 steps work, it sends the IP to the client machine, but there are 6 steps I had to follow
And of course, I started the dhcpd process.

He also wants to forward traffic, but confirmed that setting up and running dhcpd works.

@willianholtzm how *exactly* do you run dhcpd directly (complete command)
Also

loqs wrote:

What is the status of the service?

systemctl status dhcpd4@enp8s0.service

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#24 2020-07-02 12:17:32

willianholtz
Member
Registered: 2017-09-23
Posts: 52

Re: What is the simplest way to make a DHCP server?

seth wrote:
willianholtz wrote:

Only the 4 steps work, it sends the IP to the client machine, but there are 6 steps I had to follow
And of course, I started the dhcpd process.

He also wants to forward traffic, but confirmed that setting up and running dhcpd works.

@willianholtzm how *exactly* do you run dhcpd directly (complete command)
Also

loqs wrote:

What is the status of the service?

systemctl status dhcpd4@enp8s0.service

Only dhcpd in the terminal

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#25 2020-07-02 14:02:08

seth
Member
Registered: 2012-09-03
Posts: 60,972

Re: What is the simplest way to make a DHCP server?

This will, in contrast to your service, run dhcp on all interfaces (and including IPv6) - what brings us back to how the subnets are actually arranged, notably how PS4 and arch system are connected (wifi or wired LAN)

We're also still lacking the service status.

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