ISR with mail server

[mbluemel]

I am installing a 1841 and have a bit of a problem. I need to forward all smtp traffic on the outside to a mail server on the internal network. I was hoping to do a static as I would on a pix but this does not work. Everything is running except for this and I am lost on how to do it.

[leighharrison]

Hi there,

You would do it in the same way, but the config is different. You need to:-

a) Specify inside and outside addresses - use the command ip nat inside/outside on the interfaces

b) Configure port-static NAT from the outside to inside.

If you have an ip address specified in the outside world for your mail server, then use a static NAT.

Check out this link for config specifics:-

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipras_r/1rfipadr.htm#wp1061980

Hope that helps,

LH

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[mbluemel]

I have done it using SDM but it doesnt seem to be working. I cannot telnet to port 25 from the outside. I am probably being a prqat but this job is getting me down today and I dont think I am working at full speed.

[leighharrison]

Can you paste the config that you've got in there?

LH

[mbluemel]

attached. Thanks for all your help.

[leighharrison]

Hello again,

You've put the nat statement in the wrong way round! Easily fixed.

You've got:

ip nat inside source static tcp 192.168.1.1 25 x.x.x.x 25 route-map SDM_RMAP_3 extendable

You need something along the lines of:

ip nat outside source static tcp x.x.x.x 25 192.168.1.1 25

Have a go with that and let me know!

LH

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[mbluemel]

Thanks Leigh. I dont know why the GUI seems to always put it in the wrong way around. After messing around with this ( there were several other problems) I asked the customer if he was happy with a Pix instead. This is now in and working fine. Thanks for your help anyway.

[leighharrison]

HURRAH!!

Great work fella - nothing better than a happy customer ;-)

LH