Question

Can you route multiple NAT'd Internet Connections with a standard Cisco or similar router?

Asked by: bitincusa

I have a client that has 2 T1s from 2 different providers.  They use the one connection for all of their internet traffic.  The other is used right now for incomming VPN connections.  On both connections I have Cisco PIX 501s.  What I would like to do is set a router (Cisco or similar) on the inside of the PIXs.  I would like to then set all the workstations to use the router as the default gateway.  I would set the router to continue to use the primary internet connection as it is now but would gain the ability to log in to the router and change the default route to the other connection in the event of an outage.  Would this work?  I am using PAT/NAT on both PIXs.  My current LAN is flat on a 255.255.255.0 subnet.

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Asked On
2007-08-20 at 20:11:19ID22775783
Tags

multiple

,

nat

,

cisco

,

router

,

internet

Topics

Network Routers

,

Cisco PIX Firewall

,

Network Operations

Participating Experts
3
Points
500
Comments
4

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Answers

 

by: rsivanandanPosted on 2007-08-21 at 00:56:30ID: 19736067

Yes and better still, if you want, you can do this and along with this you can make the switchover automatically.

You could run a routing protocol between PIX1 and the router, just add a static route with higher administrative distance on router, so that when the link goes down traffic switches over to PIX2

Cheers,
Rajesh
 

 

by: lrmoorePosted on 2007-08-21 at 04:28:58ID: 19736747

Agree with Raj. You can use several methods of making the failover dynamic, or you and do some pseudo-load balancing using route maps. Check out route-maps and SLA monitors:
http://www.cisco.com/en/US/products/sw/iosswrel/ps5413/products_feature_guide09186a00801d862d.html
http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature_guide09186a00801d1e95.html

Since your 501's don't support advanced routing protocols like OSPF, I would suggest using the router to make those decisions. On the other hand, if you were to upgrade your 501's to ASA's then you can use OSPF in conjunction with the T1 router to make those intelligent decisions.

 

by: llyquidPosted on 2007-08-21 at 06:03:22ID: 19737384

The cisco ASA support IP SLA command s natively,   so you would only need a single piece of hardware to "Fail Over"  if this is what you want...      

Why not use both T1's at the same time,   send your servers and SMTP out one connection,  and let all the workstations surf out the other...  This can be done with Policy Based Routing... which is in effect using the route-maps and set ip next hop commands...   do a search on Cisco website for "PBR"  and you'll get several different scenarios and examples...


20120131-EE-VQP-002

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