DHCP Problems

[Alan Chandler]

I have been reconfiguring the networking on my SARGE based server so 
that it can act as an internet gateway for my home network.  This 
requires that it uses dhcp (client) to get an ip address from my ISP for 
the internet interface (eth0) and that it has a fixed ip address with a 
dhcp server for the lan side interface (eth1).

In /etc/network/interfaces if have two stanzas, One for the external 
interface is

iface eth0 inet dhcp
        pre-up /etc/firewall $IFACE
        pre-up echo 1 > /proc/sys/net/ipv4/ip_forward
the other for the lan side is

iface eth1 inet static
        address 10.0.10.100
        netmask 255.255.255.0


However, I am suffering because dhclient appears to operate on both 
interfaces, and seems to get a lease from the the server on this machine 
which it the overwrites the static interface definition.

I have temporarily made my server recognise the ethernet MAC address of 
the static interface and allocate the same address - but surely there is 
a way to tell dhclient not to try and discover an address for an 
interface.  I tried to use the alias option in dhclient.conf, but that 
didn't seem to do anything.

Is there a better way?



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