changed private ip for "nat inside source"

[ilpadrino]

Help. I'm trying to implement an smtp gateway server. so i changed in the perimiter router the mapping of the public email address from the internal ip of the exchange server to the internal ip of the new gateway box like this:

ip nat inside source static 192.168.20.67 123.456.789.123

becomes:

ip nat inside source static 192.168.20.253 123.456.789.123

But once I change that, now you can't ping the smtp gateway server from the outside. Does anyone have an idea of where I could be blocking it in the router?

Thanks.

 

[tschouten]

I'm not quite positive of what is taking place here, could you elaborate on it a little?

 

[ilpadrino]

192.168.20.67 is an email server.
on the perimiter router this email server address is nat'd

ip nat inside source static 192.168.20.67 public.ip.address

i just want to change this nat to the new server, 192.168.20.253.

it doesn't work. email is not being received.

 

[dx1]

You might have to clear the nat translation table.

clear ip nat trans *

 

[ilpadrino]

thanks, i found the problem, discovering another problem in the process.

 

[tschouten]

was going to suggest what dx1 stated. glad you found the problem could you post the problem and the fix? Would like to know what it was.

 

[ilpadrino]

i believe when i remove the old trans, it prompts me to clear ip nat trans automatically.

the problem appears to be a bad NIC / hardware on the server. i'm building a brand new machine to try. the server was never consistantly responsive to connection attempts. thanks for your help.