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One tricky question about NAT with gateway less server

Unanswered Question
Nov 3rd, 2009
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Hi, all

Thanks in advance

I have one problem regarding bidirectional natting.


One of our customer requiremant is as follows

Customer has a IP trapper device which is preconfigured and can not configure it because they have no access to this box.

But now they want to connect this vpn box from internet,but they dont know the gateway of device.

We have done the following config on rouetr which is connected to internet.

1)First configure one to one static nat for ip trapper device.(1.1.1.1 to 2.2.2.2)

2)Then we configured the outside natting on interface by which public user's ip address converted to 1.1.1.9 with add-route option and ip nat pool option.

But stilll we can not access the Ip trapper from internet.


Please suggest the config which will work



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Giuseppe Larosa Tue, 11/03/2009 - 11:16
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Hello Sandeep,

you could try to use IP proxy-arp:

whatever default gateway the box is trying to use it has to perform an ARP request for it.

if your router has an ip address in net 1.1.1.x and can answer to ARP requests for an IP of type 1.1.1.y with its own MAC address you should be fine.


you need to enable ip proxy arp also for local ip addresses


ip proxy-arp

is the normal command


ip local-proxy-arp

is the one I'm suggesting


see

http://www.cisco.com/en/US/docs/ios/ipaddr/command/reference/iad_arp.html#wp1013159


Hope to help

Giuseppe


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