Arch Linux

allbluedream

Member

Registered: 2008-04-06

Posts: 155

[SOLVED]dhcp isn't getting ip addresses

I installed Arch yesterday and dhcp was working fine for me. Somehow I decided to reinstall today to familiarize myself with Arch, and dhcp doesn't seem to work.

Before installation the correct tg3 driver for my ether card was loaded, but I could not go for the FTP installation (error fetching packages or something). Pinging Google with

ping -c 3 www.google.com

returned an "unknown host" message.
I chose to install from CD, and after successful installation I was still not able to connect. Pinging Google always gave me the same result, and pinging localhost sometimes yielded a "Network is unreachable" message.

I am connected to the net with dhcp under Ubuntu now. Issuing ifconfig gets me:

eth0      Link encap:以太网  硬件地址 00:1a:a0:ff:35:d6  
          inet 地址:158.143.185.35  广播:158.143.187.255  掩码:255.255.252.0
          inet6 地址: fe80::21a:a0ff:feff:35d6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  跃点数:1
          接收数据包:6956 错误:0 丢弃:0 过载:0 帧数:0
          发送数据包:599 错误:0 丢弃:0 过载:0 载波:0
          碰撞:0 发送队列长度:1000 
          接收字节:1088072 (1.0 MB)  发送字节:110255 (107.6 KB)
          中断:17 

lo        Link encap:本地环回  
          inet 地址:127.0.0.1  掩码:255.0.0.0
          inet6 地址: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  跃点数:1
          接收数据包:1960 错误:0 丢弃:0 过载:0 帧数:0
          发送数据包:1960 错误:0 丢弃:0 过载:0 载波:0
          碰撞:0 发送队列长度:0 
          接收字节:98000 (95.7 KB)  发送字节:98000 (95.7 KB)

wlan0     Link encap:以太网  硬件地址 00:1b:77:b9:5f:12  
          UP BROADCAST MULTICAST  MTU:1500  跃点数:1
          接收数据包:0 错误:0 丢弃:0 过载:0 帧数:0
          发送数据包:0 错误:0 丢弃:0 过载:0 载波:0
          碰撞:0 发送队列长度:1000 
          接收字节:0 (0.0 B)  发送字节:0 (0.0 B)

wmaster0  Link encap:未指定  硬件地址 00-1B-77-B9-5F-12-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  跃点数:1
          接收数据包:0 错误:0 丢弃:0 过载:0 帧数:0
          发送数据包:0 错误:0 丢弃:0 过载:0 载波:0
          碰撞:0 发送队列长度:1000 
          接收字节:0 (0.0 B)  发送字节:0 (0.0 B)

Never mind the Chinese characters, but on the second line you can see that I am getting the correct addresses. Under Arch I could not get the inet line, and no inet6 line either. wlan0 and wmaster were also missing, but as I didn't set up wireless connections, maybe they shouldn't be there anyway.

Besides, I used the same configuration as I did yesterday, which worked flawlessly. Although as I said, I wasn't able to get a connection even before I tried to set up anything, so my own configuration might not be the problem.

Here is my rc.conf

#
# /etc/rc.conf - Main Configuration for Arch Linux
#

#
# -----------------------------------------------------------------------
# LOCALIZATION
# -----------------------------------------------------------------------
#
# LOCALE: available languages can be listed with the 'locale -a' command
# HARDWARECLOCK: set to "UTC" or "localtime"
# TIMEZONE: timezones are found in /usr/share/zoneinfo
# KEYMAP: keymaps are found in /usr/share/kbd/keymaps
# CONSOLEFONT: found in /usr/share/kbd/consolefonts (only needed for non-US)
# CONSOLEMAP: found in /usr/share/kbd/consoletrans
# USECOLOR: use ANSI color sequences in startup messages
#
LOCALE="en_US.UTF-8"
HARDWARECLOCK="UTC"
TIMEZONE="Europe/London"
KEYMAP="dvorak"
CONSOLEFONT="default8x16"
CONSOLEMAP=
USECOLOR="yes"

#
# -----------------------------------------------------------------------
# HARDWARE
# -----------------------------------------------------------------------
#
# Scan hardware and load required modules at bootup
MOD_AUTOLOAD="yes"
# Module Blacklist - modules in this list will never be loaded by udev
MOD_BLACKLIST=(net-pf-10 pcspkr)
#
# Modules to load at boot-up (in this order)
#   - prefix a module with a ! to blacklist it
#
MODULES=(tg3 iwl3945 snd-mixer-oss snd-pcm-oss snd-hwdep snd-page-alloc snd-pcm snd-timer snd snd-hda-intel soundcore)
# Scan for LVM volume groups at startup, required if you use LVM
USELVM="no"

#
# -----------------------------------------------------------------------
# NETWORKING
# -----------------------------------------------------------------------
#
HOSTNAME="arch"
#
# Use 'ifconfig -a' or 'ls /sys/class/net/' to see all available
# interfaces.
#
# Interfaces to start at boot-up (in this order)
# Declare each interface then list in INTERFACES
#   - prefix an entry in INTERFACES with a ! to disable it
#   - no hyphens in your interface names - Bash doesn't like it
#
# Note: to use DHCP, set your interface to be "dhcp" (eth0="dhcp")
#
lo="lo 127.0.0.1"
eth0="dhcp"
INTERFACES=(eth0)
#
# Routes to start at boot-up (in this order)
# Declare each route then list in ROUTES
#   - prefix an entry in ROUTES with a ! to disable it
#
gateway="default gw 192.168.0.1"
ROUTES=(!gateway)
#
# Enable these network profiles at boot-up.  These are only useful
# if you happen to need multiple network configurations (ie, laptop users)
#   - set to 'menu' to present a menu during boot-up (dialog package required)
#   - prefix an entry with a ! to disable it
#
# Network profiles are found in /etc/network-profiles
#
#NET_PROFILES=(main)

#
# -----------------------------------------------------------------------
# DAEMONS
# -----------------------------------------------------------------------
#
# Daemons to start at boot-up (in this order)
#   - prefix a daemon with a ! to disable it
#   - prefix a daemon with a @ to start it up in the background
#
DAEMONS=(syslog-ng @network netfs crond)


# End of file

hosts

#
# /etc/hosts: static lookup table for host names
#

#<ip-address>    <hostname.domain.org>    <hostname>
127.0.0.1        localhost.localdomain    localhost arch

# End of file

Any idea?

Last edited by allbluedream (2008-04-10 01:57:19)

fed359

Member

Registered: 2007-11-21

Posts: 46

Re: [SOLVED]dhcp isn't getting ip addresses

Have you checked /var/log/messages.log for any errors related to dhcpcd?

allbluedream

Member

Registered: 2008-04-06

Posts: 155

Re: [SOLVED]dhcp isn't getting ip addresses

Thanks for the reply. I just got it to work by issuing this command before anything else:

dhcpcd -h arch -t 120 eth0

I don't think that the host part is relevant though. Previous attempts without specifying '-t' showed that it was a 'time out' problem.

I do wonder how to reconnect once dhcpcd timed out. I can't run dhcpcd twice, and Arch doesn't know how to do that by itself, e.g. later during FTP/HTTP installation, the installer told me that 'dhcp failed', apparently because I just did dhcpcd myself.

Currently I have to reboot if dhcp actually fails. I believe that there are better ways that I don't know of?

ibendiben

Member

Registered: 2007-10-10

Posts: 519

Re: [SOLVED]dhcp isn't getting ip addresses

I do wonder how to reconnect once dhcpcd timed out. I can't run dhcpcd twice, and Arch doesn't know how to do that by itself, e.g. later during FTP/HTTP installation, the installer told me that 'dhcp failed', apparently because I just did dhcpcd myself.

Currently I have to reboot if dhcp actually fails. I believe that there are better ways that I don't know of?

You can kill dhcpcd with:

dhcpcd -x eth0

and then try again...

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Misfit138

Misfit Emeritus

From: USA

Registered: 2006-11-27

Posts: 4,189

Re: [SOLVED]dhcp isn't getting ip addresses

If dhcpcd times out with the default -t setting, edit it under /etc/conf.d/dhcpcd:

DHCPCD_ARGS="-R -t 30 -h $HOSTNAME"

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allbluedream

Member

Registered: 2008-04-06

Posts: 155

Re: [SOLVED]dhcp isn't getting ip addresses

Thank you both

Now that this problem is solved, many more are coming... Em, I guess this is the fun part of Arch