02-02-2020 08:22 PM
Hi all,
Just wondering if this is possible on cisco.. doesn't seem to have worked for me.
I am trying to do some Portforwading with the same Port number to the same router on 2 different WAN interfaces.
ip nat inside source static tcp 192.168.0.252 50000 interface Cellular0 50000
ip nat inside source static tcp 192.168.0.252 50000 interface Dialler2 50000 ==> not working, as cisco does not allow me to have 2 similar port numbers. So I can only have one of the above, not both. However, I would need both working as this is a failover config.
Thanks so much all.
Solved! Go to Solution.
02-11-2020 03:46 PM - edited 02-12-2020 12:05 AM
Hello
This may be due to your own rtr by default creating arp aliases for each of the static nat statements public natted address, So then any arp request/replies from/to these hosts the router will be responding with the same mac address hence it could be why the rtr is complaining about duplicate address conflict with the dynamic route-map nat interface statements.
To negate this you could try and append the "no-alias" to your static nat statements, and then add a static arp entry for each public facing interface with it own mac-address.
sh arp | in 110.60.65.2|200.60.65.2
sh ip aliases
try this first
ip nat inside source static tcp 192.168.1.2 80 110.60.65.2 80 extendable no-alias
ip nat inside source static tcp 192.168.1.2 80 200.60.65.2 80 extendable no-alias
if that doesn't t help then also add the following:
arp 110.60.65.2 axxx.xxx.xxx arpa ( mac address of public facing interface)
arp 200.60.65.2 bxxx.xxx.xxx arpa ( mac address of public facing interface)
02-13-2020 09:00 AM
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