[SOLVED] dhclient doesn't set domain-name

[Whissi]

Hi,

I have network with an own domain name (intern.example.org for example).
A Debian system is running a dhcpd (isc-dhcpd-4.1.1-P1) and a DNSd.

Everything is working fine:
Other clients (Windows, Debian and Ubunt systems) will get the network configuration by the DHCP. Every client will set the domain-name option for example correctly.

Now I added my first Gentoo system to my network. It's running dhclient (isc-dhclient-V3.1.2p1-Gentoo).

The problem is, that dhclient does not set the domain. For example, after dhclient received the configuration from the dhcpd, my "/etc/resolv.conf" looks like

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gentoo ~ # cat /etc/resolv.conf
# Generated by dhclient for interface eth0
search intern.example.org
nameserver 192.168.1.2

but I expected

Code: Select all

domain intern.example.org
search intern.example.org
nameserver 192.168.1.2

I captured the DHCP request and ACK, I can see that dhclient is requesting the domain-name as configured, and also receiving the domain-name... but it isn't set.

Here are some configuration files:

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gentoo ~ # cat /etc/conf.d/net
# This blank configuration will automatically use DHCP for any net.*
# scripts in /etc/init.d.  To create a more complete configuration,
# please review /etc/conf.d/net.example and save your configuration
# in /etc/conf.d/net (this file :]!).

config_eth0=( "dhcp" )
module_eth0=( "dhclient" )

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gentoo ~ # cat /etc/dhcp/dhclient.conf
send host-name "gentoo";
request subnet-mask, broadcast-address, time-offset, routers,
        domain-name, domain-name-servers, domain-search, host-name,
        netbios-name-servers, netbios-scope, interface-mtu,
        ntp-servers;

[tony-curtis]

"search" does the same thing as "domain" here, however search lets you list out multiple names, whereas domain is just a single value.

There's a man page for resolv.conf(5) that shows how this process works.

[Whissi]

"search" does the same thing as "domain" here, however search lets you list out multiple names, whereas domain is just a single value.

There's a man page for resolv.conf(5) that shows how this process works.

No, it doesn't the same thing here: Without "domain",

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hostname -f

won't work for example.

You need both. And remember, Debian and Ubuntu will set both values like expected.

[tony-curtis]

Oh, well my brain apparently failed today. I've never actually encountered that problem (in over 20 years )

[Veldrin]

check if you have your hostname (without domainname) listed in /etc/hosts.

If you remove it, hostname -f should work again.

cheers
V.

[cwr]

I've had a similar problem with a missing local domain name, where the answer was to use eg:
xxx.xxx.xxx.xxx localhost.localdomain localhost
and not
xxx.xxx.xxx.xxx localhost localdomain.localdomain
in /etc/hosts.

I can't imagine why this would make a difference, but apparently it does. It might work
for DHCP as well.

Will

[Whissi]

Hi,

check if you have your hostname (without domainname) listed in /etc/hosts.

If you remove it, hostname -f should work again.

Yes, the hostname without the domain-name was listed in the hosts file.
I removed it and hostname -f is now working as expected.

Thank you!