[114435] in North American Network Operators' Group
Re: two interfaces one subnet
daemon@ATHENA.MIT.EDU (Hector Herrera)
Mon May 11 17:28:15 2009
In-Reply-To: <f2675b350905111422k30de64caub1bce3630ac1e8df@mail.gmail.com>
Date: Mon, 11 May 2009 14:28:07 -0700
From: Hector Herrera <hectorherrera@gmail.com>
To: David Devereaux-Weber <ddevereauxweber@gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Mon, May 11, 2009 at 2:22 PM, David Devereaux-Weber
<ddevereauxweber@gmail.com> wrote:
> Chris,
>
> I work with iHDTV <http://ihdtv.org>, a project that sends uncompressed h=
igh
> definition television (1.5 Gbps) as UDP over two 1 Gbps interfaces. =A0If=
both
> interfaces are on the same subnet, the OS sees the same router (gateway)
> address on both interfaces, and the results are sub-optimal ... around 50=
%
> packet loss.
packet loss is probably due to the network switch having to re-learn
the location of the MAC address constantly as it sees packets on two
or more ports with the same MAC address (think STP loops).
If your network stack and network device (switch) supports LACP, then
you can have multiple connections between a host and a network device.
That is a very easy way to increase capacity and add redundancy.
That is how all of our VMWare ESX 3.5i servers are connected.
Hector
