Strange empty NAT entry

Unanswered Question
Jul 27th, 2009

Hi All,

What's causing some work stations to create this strange NAT entry with no protocol defined and no Outside local and Outside global.

core2#sh ip nat trans | inc 172.16.75.139

Pro Inside global Inside local Outside local Outside global

--- 210.15.240.9 172.16.75.139 --- ---

tcp 210.15.240.9:5380 172.16.75.139:5380 61.137.191.125:80 61.137.191.125:80

Any ideas?

Thanks.

Andy

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Roman Rodichev Wed, 08/05/2009 - 09:55

that a static NAT entry, look for "ip nat inside source static" in your config

regards,

Roman

asaykao73 Wed, 08/05/2009 - 16:53

Hi Roman,

Thanks for the reply.

There is no static nat configured which is why I'm puzzled by that entry.

core2#sh run | inc nat

nat server

nat server

nat server

nat server

nat server

ip nat outside

ip nat inside

ip nat inside

ip nat outside

ip nat inside

ip nat translation timeout 300

ip nat pool NAT-POOL 210.15.240.6 210.15.240.9 netmask 255.255.255.224

ip nat inside source route-map nonat pool NAT-POOL overload

route-map nonat permit 10

That's the whole config and you can see that there is no static nat configured anywhere.

I have a few dhcp clients doing this on the network.

Look for example at the dhcp clients of 172.16.75.23 and 172.16.75.239.

core2#sh ip nat trans

Pro Inside global Inside local Outside local Outside global

tcp 210.15.240.9:1024 172.16.75.239:49796 210.15.254.237:443 210.15.254.237:443

--- 210.15.240.8 172.16.75.23 --- ---

--- 210.15.240.9 172.16.75.239 --- ---

tcp 210.15.240.6:1024 172.16.75.26:49240 207.46.61.90:80 207.46.61.90:80

tcp 210.15.240.6:1025 172.16.75.243:50811 202.45.127.78:993 202.45.127.78:993

tcp 210.15.240.6:1032 172.16.75.232:51226 66.102.11.164:80 66.102.11.164:80

tcp 210.15.240.6:1026 172.16.75.232:51526 72.167.82.19:993 72.167.82.19:993

tcp 210.15.240.6:1027 172.16.75.241:49982 209.85.129.111:993 209.85.129.111:993

tcp 210.15.240.8:54775 172.16.75.23:54775 89.149.236.104:80 89.149.236.104:80

Thanks.

Andy

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