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To: Jerry Jensen <youknicks@yahoo.com>
Date: Sun, 7 Mar 2004 06:48:40 +0300 (MSK)
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cc: freebsd-net@freebsd.org
Subject: Re: multiple logical interfaces
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> is it possible in freebsd to have multiple logical
> interfaces associated with say the loopback interface?
>  if so, how does one do this programmatically (as
> opposed to from the command line).
> 
> need this for building traffic generators that need to
> simulate a bunch of different ip sources.  solaris
> allows it as does linux i believe. 
> thx.
Is it what you want?

> ifconfig -a | grep lo
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0xa 
lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
lo2: flags=8008<LOOPBACK,MULTICAST> mtu 16384
lo3: flags=8008<LOOPBACK,MULTICAST> mtu 16384

If it is, there is from kernel config:

> grep loop /sys/i386/conf/garkin 
pseudo-device   loop    4       # Network loopback