Q on what IGP routing protocol to use for supplying only gateway address

Mark D. Kaye mark at eatonkaye.com
Thu Sep 14 21:25:30 UTC 2006


In Answer to you question re Windows 2000/2k3 you would just need to install
routing and remote access service (RRAS) - part of windows, you can then add
OSPF as a routing protocol and tell it which adapter to listen on.

I have used this successfully when setting ISA Server up with a default
gateway off one nic (pointing towards the net - protected by a decent
firewall) and another pointing at the local network, one can then learn the
LAN routes using OSPF or RIP etc. and have a default route out the other

Mark Kaye

-----Original Message-----
From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu] On Behalf Of
Sent: 14 September 2006 18:55
To: Roland Dobbins
Cc: nanog at nanog.org
Subject: Re: Q on what IGP routing protocol to use for supplying only
gateway address

On Thu, 14 Sep 2006, Roland Dobbins wrote:

> On Sep 14, 2006, at 10:35 AM, william(at)elan.net wrote:
>> Any suggestion as to what IGP protocol is best for this scenario?
> This is more of a cisco-nsp question, but probably OSPF, as it's supported
> by the routing daemons on most *NIXes out of the box.  I don't know about 
> Windows.

If this was 5+ years ago, I'd have said RIP as it works great for 
supplying only gateway address, but I want RIP to go RIP and will
not use it again. So yes OSPF seems like best choice, but I was
hoping something simple for gateway-only is available. I've no idea
yet how to deal with Windows (all win2000 and win2003), anybody?

> Are you doing anycasting or something?

Yes, anycasting will be involved but only for very small number of
servers (all linux) - that is kind-of separate issue. The equipment
itself however will only see local gateway addresses (obviously), so
it should not care or know about it.

> If simple redundancy in the default gateway is the goal, another (and 
> probably simpler) method is to implement HSRP or GLBP between your routers

> which are serving the hosts in question.

Can't use HSRP in this case (or IVRP or whatever else its called with 
non-cisco options) - too long to explain why.

William Leibzon
Elan Networks
william at elan.net
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