827 NAT Question

Unanswered Question
Jun 6th, 2007
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Hi, I am trying to configure an 827 running 12.2(8)T5 with static NAT.

The WAN IP is provided via DHCP on the ATM interface and the LAN is connected via Ethernet0 to a subnet

I want to forward ALL traffic hitting the WAN interface to IP add on the LAN.

I would usualy use the command

'ip nat inside source static interface Dialer1'

However the 827 does not accept this syntax. I get as far as 'ip nat inside source static' but after that it is expecting an inside global address and will not accept 'interface dialer1'

I do not have a static WAN address I can give it. Any ideas?

Many thanks.


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Overall Rating: 5 (1 ratings)
foxbatreco Wed, 06/06/2007 - 08:46
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Hii..as i understand frm ur post... u basically want to hv the inside n/w to move out the isp interface using nat with atm i/f.

u shud use....ip nat inside source list 1 interface dialer 1 overload.

and define an acl as: access-list 1 permit .

ths shld resolve the problem if this is wht is intended.

the statement u hv used is basically a static mapping which needs a global ip to be linked with local ip protocol for traffic redirection, which is not suitable for ur scenario.

Pls do rate the post.

N_Martin Wed, 06/06/2007 - 08:59
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No that is not what I am trying to achieve. I would like to forward ALL inbound traffic from the internet to a specific internal IP address.

It is a simple setup that even the cheapest routers can achieve but the command I usually use is not accepted on this router.

I did try configuring the router as a transparent bridge but the device behind the router became unstable when the ISP changed the WAN IP address hence why I am trying the NAT method. I can get an 837 to work just not this dam 827.

a.cruea1980 Thu, 06/07/2007 - 10:44
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Have you tried: ip nat source static int di1 ?

The only other idea is to try a route-map with NAT. ip nat outside route (routemap name) blah blah blah. . .but I don't know if it'll work.

Can't say I've ever really dealt with NAT and DHCP.

N_Martin Fri, 06/08/2007 - 01:50
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I have answered my own question.

you need the feature 'NAT - Default Inside Server Enhancement '

Just upgraded the IOS - job done!

paolo bevilacqua Fri, 06/08/2007 - 02:05
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Anyone that answers his own question and takes the time to let others know, deserves appreciation, so I have rated your post!

N_Martin Fri, 06/08/2007 - 04:53
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I have found the answers to many of my questions on this forum, it is only fair that I contribute.

Thanks for your vote!


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