[lug] IP alias and DHCP mix

[Chip Atkinson]

Maybe it's that the dhcp client can't assign an address to aliased
ethernet ports.  Have you tried getting the DHCP assigned address to eth0
and assigning your 192.168.x.x IP to eth0:0?  

On Sun, 17 Sep 2006, D. Stimits wrote:

> I'm trying to set up a fedora core 5 machine with a single NIC. For the 
> moment, I have a static address assigned to eth0 so I can ssh in (it 
> doesn't have a keyboard or monitor, though I could grab one with some 
> difficulty). The ssh works fine, it's a non-public 192.x address.
> 
> I'm trying to assign an alias for eth0:0, so that it can grab a dhcp 
> address as well (if I do just dhcp I can no longer talk to it, I don't 
> control the dhcp server). It keeps failing with some bogus message that 
> does not make any sense, which would seem like it is trying to be 
> assigned an address that overlaps another...but there is no possible way 
> it could, this box does not request any particular IP, the dhcp server 
> is for a public IP and the only other IP is an unrelated non-public. The 
> message I'm getting is:
> 
> Determining IP information for eth0:0...SIOCSIFFLAGS: Cannot assign 
> requested address
> SIOCSIFFLAGS: Cannot assign requested address
>  failed.
> 
> The script (real MAC hidden) 
> "/etc/sysconfig/network-scripts/ifcfg-eth0:0" is:
> DEVICE=eth0:0
> BOOTPROTO=dhcp
> HWADDR=00:01:02:03:04:05
> ONBOOT=yes
> TYPE=Ethernet
> DHCP_HOSTNAME=stub
> 
> Is there some restriction that an IP alias cannot work as DHCP? Is there 
> any other possibility of why it would fail other than requesting a 
> non-assignable IP (since it does not ask for a particular IP)?
> 
> I'll add that other linux machines on this same dhcp server work fine 
> with very similar scripts (aside from not being a virtual IP alias). 
> Obviously the NIC works, or my ssh could not get in.
> 
> D. Stimits, stimits AT comcast DOT net
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