configuring two network interfaces, same subnet

[Vince]

> -----Original Message-----
> From: owner-freebsd-questions at freebsd.org 
> [mailto:owner-freebsd-questions at freebsd.org] On Behalf Of 
> Alfredo Aguirre
> Sent: 13 June 2005 19:11
> To: freebsd-questions at freebsd.org
> Subject: configuring two network interfaces, same subnet
> 
> Hello people!,
> 
Hi

> I'm trying to configure 2 network interfaces in the same 
> subnet, because i want to  use one interface for NS and the 
> other for MX,
> 
> if i try
> bash-2.05b# ifconfig em0 aa.bb.dd.1 netmask 255.255.255.0 
> bash-2.05b# ifconfig em1 aa.cc.ee.2 netmask 255.255.255.0
> ifconfig: ioctl (SIOCAIFADDR): File exists
> 
> ok they both cannot be in the same subnet.

Yep this thread here 
http://lists.freebsd.org/pipermail/freebsd-net/2003-July/001108.html
Seems to cover it quite well.


> 
> i know that i cannot have them both in the same subnet 
> without modifying the routing, but im confussed about it.
> 
> i also tried after settin' one of the ips, deleting the routing
> 
> bash-2.05b# route delete aa.bb.cc.0
> 
> and then setting the ip
> 
> bash-2.05b# ifconfig em0 aa.bb.dd.1 netmask 255.255.255.
> 
> ok i can now set the 2 ips in the same subnet but my DNS 
> stops working,
> 
> i dont want to change the submask, for any of my ips
> 

As far as I know you cannt have 2 interfaces on the same subnet
full stop on freebsd, and to be fair I cant see what advantage 
it would give you if you could.

Vince

> well im confused about it, so i hope you guys could adress me 
> in the right direction,
> 
> Thanks in advance,
> 
> Alfredo
> 
> 
> 
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