[asterisk-users] [Asterisk-users] asterisk +heartbeat (Wilton Helm)

[Freddi Hansen]

>
>> having two NICs on the same subnet
>
> I'm trying to wrap my brain around that in the larger network 
> picture.  Two
> NICs in the same subnet (presumably on the same computer) would have 
> access
> to the same other devices.  This could potentially increase bandwidth
> (maybe?) and offer redundancy (if NICS, wiring or switches were the 
> biggest
> source of failure).  I'm not sure how the OS would decide which one to 
> use
> for a given packet, or if an application (such as Asterisk) could 
> determine
> which one to use.  I can see potential problems with addressing, as other
> devices could send to one, and would definitely not know what to do 
> with a
> reply from the other, etc.  I'm not sure this would be an Asterisk bug.
> Without some concept of what I am missing here, I would consider it a
> cockpit error on system setup.  The only reason I can think of for having
> two NICs in a computer would be using it as a router--in which case they
> wouldn't be on the same subnet.  (OK I've done it before for redundant
> paths, but again, the paths should be on different subnets, otherwise how
> does one tell the OS which path was intended?)

Try reading:
http://www.linuxfoundation.org/en/Net:Bonding
We have 3 networks on each of our servers. Each network (and IP) is 
served by 2 nics. (yes 6 nics per server)
Works well with Asterisk, you can disconnect cables or take power from 
one of the core switches without as much as a click  in audio in ongoing 
connections.