Arch Linux

pentomasis

Member

Registered: 2019-10-17

Posts: 18

[SOLVED] No IPv4 address

Hello Everyone,

two days ago I noticed that I wasnt able to connect using the Tor-Browser. When I use Firefox or Chromium I can browse to some websites while I get 'Server not found' immediately for others. 'ip address' showed me that for some reason I only have IPv6 addresses and no IPv4 addresses. I dont know how to fix this issue. Does anybody know a solution?

Thank you very much!
pentomasis

Last edited by pentomasis (2020-03-03 23:59:25)

Wild Penguin

Member

Registered: 2015-03-19

Posts: 347

Re: [SOLVED] No IPv4 address

There is too little information in your post to give any kind of advice. You need to give a bit more information, such as:

1. What is your network HW setup (i.e. what router, what kind of connection)?

2. Which way did you configure your network?

More specifically, go trough the parts in https://wiki.archlinux.org/index.php/Ne … connection and post the results here.

If you are using a router, check what kind of connection it sees (i.e. trough it's web admin interface)..

A few guesses: if it used to work previously, and started occurring without you changing anything, it could be a problem on your ISPs side. For example, if you live in an apartment complex, there might be a (fiber-optic) modem the user has no access to, which might get screwed up. I once needed to change my MAC address because of such a rare situation (which has happened only once in ~4 years).

Last edited by Wild Penguin (2020-02-28 13:49:53)

pentomasis

Member

Registered: 2019-10-17

Posts: 18

Re: [SOLVED] No IPv4 address

Sorry, I am connected via ethernet and wifi. All other devices (smart tv, windows machines, mac and android) on the network are not having any issues. Its only my beloved Arch that seems to have problems. I feel like it must be an issue with ipv4.

[user@archlnx ~]$ ip address
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: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 62:0a:31:a2:1d:e4 brd ff:ff:ff:ff:ff:ff
    inet6 2003:e3:5725:645e:b465:d86:46fe:d610/64 scope global temporary dynamic 
       valid_lft 14400sec preferred_lft 1800sec
    inet6 2003:e3:5725:645e:bd6:e950:dd5f:d607/64 scope global dynamic mngtmpaddr noprefixroute 
       valid_lft 14400sec preferred_lft 1800sec
    inet6 fe80::127c:95f:5dbe:a7e0/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: wlp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 7e:f3:2b:31:b3:2d brd ff:ff:ff:ff:ff:ff
    inet6 2003:e3:5725:645e:a8ed:d573:802e:8c4a/64 scope global temporary dynamic 
       valid_lft 14383sec preferred_lft 1783sec
    inet6 2003:e3:5725:645e:db3d:c671:5466:17fd/64 scope global dynamic mngtmpaddr noprefixroute 
       valid_lft 14383sec preferred_lft 1783sec
    inet6 fe80::1b7e:9c4b:84dc:fa0f/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

Also when I try to ping an ipv4 address, it fails immediatly.

[user@archlnx ~]$ ping -c 2 8.8.8.8
ping: connect: Network is unreachable

ping to an IPv6 address works like a charm

[user@archlnx ~]$ ping -c 2 2001:4860:4860::8888
PING 2001:4860:4860::8888(2001:4860:4860::8888) 56 data bytes
64 bytes from 2001:4860:4860::8888: icmp_seq=1 ttl=57 time=7.81 ms
64 bytes from 2001:4860:4860::8888: icmp_seq=2 ttl=57 time=7.76 ms

--- 2001:4860:4860::8888 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 7.762/7.785/7.809/0.023 ms

Scimmia

Fellow

Registered: 2012-09-01

Posts: 12,123

Re: [SOLVED] No IPv4 address

Which isn't even close to answering Wild Penguin's questions. Please read the post again.

Wild Penguin

Member

Registered: 2015-03-19

Posts: 347

Re: [SOLVED] No IPv4 address

pentomasis: Indeed, try to go trough the documentation I've linked and answer the questions.

However, we have gathered it most likely is not a problem on your ISPs side but on your home network, most probably your Arch Linux installation. Two questions:

1. Which Network manager have you set up when you installed Arch? Or perhaps you chose a dhcp client?

2. Can you ping a local IPv4 address (such as your default G/W, which should be your router)?

IIRC NetworkManager might get enabled when Arch is installed, but I could be in the wrong. Check with "systemctl status NetworkManager". You may want to check other services also listed in the Wiki. How to go about really depends on which one you are using.

If none are enabled, you may do a quick check by manually adding the configuration with ip address add ... (look at the Wiki). Those chances are not persistent, as mentioned there.

Also, since you are connected via a wire, I would disable the WiFi (on your computer) for the time being. It will simplify things, and once you get wired connection working, you might (or might not, depending on your use case) want to enable WiFi.

pentomasis

Member

Registered: 2019-10-17

Posts: 18

Re: [SOLVED] No IPv4 address

Thank you for your reply.

Your guess that it was a problem with the router was correct. After logging in the web admin panel, I noticed that my laptop running Arch was showing up dozens of times in the list of connected devices. They were all offline but the other devices were online. The router was set to remember the IP addresses it gave each device for 3 weeks. On my laptop I activated MAC randomization in order to be a little more difficult to be tracked. I assume, that the router had no available IP addresses left it could assign to my laptop because so many were assigned to my laptop previously.

The solution for me was to delete all the non-existing instances of my laptop in the routers admin panel. After restarting the router it worked like a charm. I also changed the setting of the router to remember IP addresses for only one week. Hopefully that is short enough to not run into any more problems.

Thank you for pointing me to the correct direction

waytin

Member

From: Taiwan, ROC

Registered: 2009-02-03

Posts: 19

Re: [SOLVED] No IPv4 address

I have the same issue with my new router.

Like pentomasis said, restarting the router solved issue.

I found the solution here also seems to works, and maybe more convenient:

sudo dhclient -r ROUTER_NAME
sudo dhclient ROUTER_NAME

The ROUTER_NAME can be found by

nmcli dev

Honestly, I don't really know what the dhclient command does and why it works. It would be great if somebody can explain that.

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常無欲以觀其妙，常有欲以觀其徼

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,232

Re: [SOLVED] No IPv4 address

Using this opportunity to close this old thread.

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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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