Nortel Networks Contivity 600 - Internal addresses cannot connect to external address of internal servers

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Subject Author Date
Contivity 600 - Internal addresses cannot connect to external address of internal servers Guy Gervais 08-20-07
Posted by Guy Gervais on August 20, 2007, 2:35 pm
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Hi,

We have a Contivity 600 that has been working well for many years.

Since this morning, we cannot access internal servers using their
external (publicly visible and routable) addresses.

For example, my PC is at 10.x.x.9; we have a server at 10.x.x.100,
with an external "publicly visible" address of 20x.x.x.100 (defined on
the Contivity through Routing/NAT/Firewall).

I can connect to the server if I use the 10.x.x.100 address, but using
the 20x.x.x.100 will result in a timeout eventually.

This used to work fine, and the configuration has not been changed
recently on the Contivity.

A reboot of the Contivity fixes it for about 30-40 minutes, but we
then go back to the timeouts. The "Health Check" menu gives us nothing
out of the ordinary. (Warnings about things we haven't enabled;
nothing different than what has been working for the last few years.)

Access to other external addresses (google, digg, etc) works fine from
internal. Access to our public server from the outside also works.
It's only when internal IPs try to connect to the public addresses of
other internal IPs that it times out.

Any ideas?

Thanks,

Guy Gervais


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