Re: two gateways, one as a backup on second internet line
From: Phillip Windell (_at_.)
Date: 08/06/04
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Date: Fri, 6 Aug 2004 10:36:23 -0500
"philippe mercier" <pmercier@telelingua.com> wrote in message
news:c77d3e62.0408060715.e75da50@posting.google.com...
> 1/ when i turn on my main route again (10.0.0.1), some packets still
> go thru the backup 10.0.0.200,, why??
Dead Gateway Detection will not return back to the first gateway when it
comes back up unitl the second gateway fails. If their are more than two,
then it must work its way all the way to that last gateway (due to gateway
failures) before returning to the first one.
128978 - Dead Gateway Detection in TCP/IP for Windows NT
http://support.microsoft.com/default.aspx?scid=kb;EN-US;128978
171564 - TCP/IP Dead Gateway Detection Algorithm Updated for Windows NT
http://support.microsoft.com/default.aspx?scid=kb;EN-US;171564
> 2/ this system does not switch to the backup line,, if the [cisco] or
> the [leased line] goes down. because in that case the firewall is
> still responding to the server...
>
> How can i configure that? a timeout?
You can't.
The right way to do all this it with two lines from the same ISP that both
come into the same Router (ex. one into each of the Serial Ports on the
router). The Router is then setup with Routing Protocols that handle
determining the Routes. This Router must work together with the ISP's Router
at the other end. So, in other words you have to work together with the ISP
to make this work. Redundnacy and fault tolerance should be part of the
"plan" that you have worked out with the ISP for the services that you pay
for.
-- Phillip Windell [MCP, MVP, CCNA] www.wandtv.com
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