From: Felix Nkansah (felixnkansah@gmail.com)
Date: Thu Aug 14 2008 - 19:12:04 ART
Hi,
Yes. As far as I know, you should be able to implement it even on a 1700
series router. The IOS is what matters. Any IOS version that supports the
said technologies would be good to go.
What I usually do is to terminate the various ISP links on an edge switch,
create VLANs to separate the connections, and connect a trunk from the
switch to the outside interface of my router. Then I use subinterfaces on
the router instead of multiple physical interfaces.
As I always say, the difficulty is when you have to do NAT on the router for
each of the multiple Internet links. You may encounter the situation where
the automatic failover feature does not work. It would usually be because
connections from users whose link has failed try to access the secondary
link using existing NAT translations that belong to the previous one.
As the ISP would have uRPF in place, these connections get dropped until the
old translations time out. That is why you need to use policy NAT so that
translations are done based on the next-hop of the packet.
It's good to keep this mail short. Get to me 'offline' if you attempt it and
encounter any problems.
Regards,
Felix Nkansah, CCIE
Blogs and organic groups at http://www.ccie.net
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