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NAT on 2509

I'm working on an old 2509 (2xsync, 8xAsync, 1xEther). Idea is to connect small LAN network to the IPS via Leases Line. IP address assigned by the ISP is public.

All hosts in the local network are in private address space, so we starter dynamic NAT translation, and evrything is OK.

Now our customer wants, besides the web access, mail and web server to be accessible from the Internet. We need to define static NAT translations

from public addres and port to private address and port (eg. 80.93.X.Y:80 --> 10.0.Z.W:80).

By the book, we need to type :

ip nat inside source static |local-ip| |global-ip|

But there is a problem: no static command is available. (I can only define ac-list, for dynamic translationa)


Glob(config)#ip nat inside source ?

list Specify access list describing local addresses


Device is : 2509 (Rev:M),

IOS ver: 11.3(1) (flashfile : flash:c2500-i-l.113-1)

Any Ideas ?

  • Other Network Infrastructure Subjects

Re: NAT on 2509

Update your IOS ver to 12.0 or better, IP PLUS.

That should fix it.


Brad H.

Cisco Employee

Re: NAT on 2509

You are right..You need to run PAT by mapping tcp port 80 for web, 25 for mail etc for the same outside ip address.

Now use the IP_PLUS featureset (c2500-is-mz...)for older 11.3 ios to get that "ip nat inside source static.."command..Or any IP image in 12.0..Thx..Tejal

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