Re: How does a linux dhcp client know it's name?
From: Alan Chandler (alan_at_chandlerfamily.org.uk)
Date: 10/11/04
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To: debian-user@lists.debian.org Date: Mon, 11 Oct 2004 20:37:30 +0100
On Monday 11 October 2004 14:59, Icebiker wrote:
>
> /etc/hostname said "flipper". I tried pasting the local domain name on (my
> DLink router has a field for local domain name), but that didn't seem to do
> anything.
>
> I can't figure out how:
>
> - the resolver gets the host name from /etc/hostname, if that's what's
> supposed to happen.
I "think" that
/etc/init.d/hostname.sh calls "hostname" to set the name from /etc/hostname
the domain name comes from either /etc/hosts or from bind according to the
setting in /etc/host.conf
This gives the order (although /etc/nsswitch.conf comes in somewhere too)
If dns then looks in /etc/resolv.conf to find out where the dns is. If file,
it looks up /etc/hosts
dhcp3-client sets the info in /etc/resolv.conf.
You can cause a dhcp request to recognise the MAC address of the ethernet card
and to use that to always issue the same ip address to your box.
[NOT for your DLINK router - see why below] In fact - better than that - the
dhcp server can look up which ip address it wants to give you by looking up
the name on a dns server.
> - the router gets the hostname from the box (it can get the hostname for
> all my Windows boxes). Does the dhcp request pass the name to the router,
> or does the router query for the name from the computer.
I can't image how it does this other than potentially using NETBUI
>
> Does anybody know what package contains the resolv+ man page? Is it still
> called resolv+
man hostname
man resolv.conf
man host.conf
are all useful
>
> I suppose I could set up static IP addresses, but that seems like giving
> up.
This is the way I do it
I have my own dhcp server and nameserver running on a linux box. This is
master for the rest of the network. Its own ip address is static
(/etc/network/interfaces). 192.168.0.10 is the DLINK router and 192.168.0.20
is this linux box. I use both as nameservers
The /etc/dhcp3/dhcpd.conf
shared-network home-net {
option domain-name "home";
option domain-name-servers 192.168.0.20, 192.168.0.10;
option subnet-mask 255.255.255.0;
default-lease-time 21600;
max-lease-time 86400;
authoritative;
subnet 192.168.0.0 netmask 255.255.255.0 {
range 192.168.0.40 192.168.0.59;
option routers 192.168.0.10;
}
# The following are hosts which require a fixed ip-address (for instance
# so that NAT can direct things to them)
#
host roo {
hardware ethernet 00:50:da:ec:83:9a;
fixed-address roo.home;
}
host rabbit {
hardware ethernet 00:06:5b:b7:9c:35;
fixed-address rabbit.home;
}
host piglet {
hardware ethernet 00:0b:cd:a9:f2:62;
hardware ethernet 00:06:25:2a:fa:25;
fixed-address piglet.home;
}
host eeyore {
hardware ethernet 00:0b:cd:32:77:75;
hardware ethernet 00:20:e0:5e:18:67;
fixed-address eeyore.home;
}
host kanger {
hardware ethernet 00:50:DA:CF:A5:06;
fixed-address kanger.home;
}
host pooh {
hardware ethernet 00:30:1B:11:32:11;
fixed-address pooh.home;
}
host small {
hardware ethernet 00:06:25:57:19:5D;
fixed-address small.home;
}
host owl {
hardware ethernet 00:09:5b:24:f1:12;
fixed-address owl.home;
}
}
subnet 82.43.0.0 netmask 255.255.0.0 {
not authoritative;
}
-- Alan Chandler alan@chandlerfamily.org.uk First they ignore you, then they laugh at you, then they fight you, then you win. --Gandhi -- To UNSUBSCRIBE, email to debian-user-REQUEST@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
- Previous message: David.Grudek_at_anixter.com: "Re: Cups not working"
- In reply to: Icebiker: "Re: How does a linux dhcp client know it's name?"
- Next in thread: John Van Lierde: "Re: Fw: How does a linux dhcp client know it's name?"
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