DHCP errors

[phrack]

I used a Stage 3 install of Gentoo; been having issues with dhcp over a period of 3 re-installs.

DHCP worked fine on my first install on the base Gentoo system, but somehow it stopped working and I re-installed in an attempt to correct it. I have read over the manual several times just to make sure that I wasn't leaving anything out.

I emerged dhcpcd, and I have /etc/conf.d/net set to config_eth0=("dhcp"). I have checked to make sure that this is the correct NIC using "lspci -v" (I have two) and it is. This is not a wireless connection. I am sure that my network is configured correctly; there have been no network changes since the original working install of Gentoo.

Upon boot, Gentoo runs net.eth0 and dhcpcd, but fails to receive an IP address. I also get the error that "netmount" has failed to start.

Everything else is working correctly except my dhcp; it's driving me crazy especially since it has worked before, but refuses to now. This leads me to believe that it is a network problem, but there have been no changes to the network.

The network is MAC restricted, but my MAC address is ok because I can boot to Windows and connect.


I really need some help.


EDIT: I forgot to mention the kernel. I used genkernel as well as coldplug, and coldplug has been added to the boot runlevel. My NIC is a standard Broadcom NIC that has worked with other linux distros in the past.

[sdousley]

I emerged dhcpcd, and I have /etc/conf.d/net set to config_eth0=("dhcp").

Do you have the () in there aswell?

The one copy of /etc/conf.d/net that i have that works is:

iface_eth0="dhcp"
dhcpcd_eth0="-HD"

[phrack]

I tried your version of /etc/conf.d/net and it still did not work.

I have, however, found out a situation in which the dhcp DOES work, but it is very strange.

If I put the LiveCD back in, and remount all the partitions and chroot into the environment, using these commands, I will get dhcp working on the immediate reboot following the chroot, but only once. If I reboot again, I can't get dhcp to work.

(hda1 is Windows)

mount /dev/hda4 /mnt/gentoo
mount /dev/hda2 /mnt/gentoo/boot
cd /mnt/gentoo
mount -t proc none /mnt/gentoo/proc
chroot /mnt/gentoo /bin/bash
env-update
source /etc/profile

This is very strange to me, but perhaps this sheds some light on my problem for you more advanced linux users.

[sdousley]

ok, next time u boot and it dont work, try:

env-update 
source /etc/profile
dhcpcd eth0

See if that works

[phrack]

I tried it, it does not work.

[spencerf]

Do you have your NIC selected in the kernel? You said you used genkernel and that can be kinda buggy sometimes imho. Just do this and check.

cd /usr/src/linux
su
make menuconfig

look under: device drivers: networking support: Ethernet 10-100: then your card.

Then you have mount boot if you don't have it booted.
mount /boot
cp arch/i386/boot/bzimage /boot/kernel(whatever your kernel is saved as)
cp System.map /boot/System.map (or whatever it is named)

oh yeah then reboot.
hope this helps.

[skrye]

Hi.
Just a thought did you do:

rc-update add dhcpcd default

(or whatever client your using)

after you emerged it?

[jaboua]

Hi.
Just a thought did you do:

rc-update add dhcpcd default

(or whatever client your using)

after you emerged it?

In addition to this, I beleve the new syntax was with spaces between the parantheses and the '"', like this example:

iface_eth0=( "dhcp" )
dhcpcd_eth0="-HDN"

[sarumont]

Hi.
Just a thought did you do:

rc-update add dhcpcd default

(or whatever client your using)

after you emerged it?

No. You rc-update add net.ethX default, where X is the ethernet interface. Then you have to configure your /etc/conf.d/net correctly. Make sure to add the modules=( "dhcpcd" ) to the top. Then what jaboua has is correct for the rest of the config.