[c-nsp] 1841 w/2 Internet and NAT

[Bruce Pinsky]

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Charles J. Boening wrote:
> 
> I was wondering if someone knew if the Cisco 1841 with advanced services
> could support NAT to two different providers?
> 
> I have one provider on a T1 and another provider on Ethernet to another
> router that goes T1.  I understand that without dynamic routing,
> incoming connections will be effected.  That's ok.  I'm just worried
> about keeping Internet access from the inside going.
> 

It's certainly possible to map into two different NAT pools from different
provider address spaces.  That being said, if one of the links goes down,
existing connections will be reset.

My concern is detecting "failure" on the ethernet interface for rerouting
since you are likely to suffer soft failures in the forwarding path that
leave the connection up, but blackholing traffic.  You need some detection
mechanism to move traffic off of that link should that occur.  Something
like "Enhanced Object Tracking" or "Reliable Static Routing Using Object
Tracking" would be desirable.

http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a00801541be.html

http://www.cisco.com/en/US/products/sw/iosswrel/ps5413/products_feature_guide09186a00801d862d.html

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bep

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