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NAT and PAT

joby.varghese
Level 1
Level 1

Hi,

Can any one of you help me with an explanation why I am seeing the 1:1 static NATed IP getting patted as well with the below setup. It is some times getting patted using the internal IP (172.X.X1.2) and <public IP1>. And this happening only for the only for (ip nat inside source static 172.X.X1.2 <public IP1>) not to all NAT statement. It looks strange to me:


interface Loopback10
 description ***** Loopback for CLAN PAT *****
 ip address <public IP3> 255.255.255.255

ip nat inside source list 110 interface Loopback10 overload
ip nat inside source static 172.X.X1.2 <public IP1>
ip nat inside source static 172.X.X.11 <public IP2>

access-list 110 deny   ip host <management loopback IP> any
access-list 110 deny   ip host <CE WAN interface IP> any
access-list 110 permit ip any any

When see the NAT translation I can see the 172.X.X1.2 getting translated Loopback 10 IP or <public IP1> getting translated Loopback 10 IP.

1941_001B#sh ip nat tr

udp <Loopback10 IP>:55867   172.X.X.2:55867     <Destination>:14040    Destination:14040

tcp <Loopback10 IP>:55867   <public IP1>:55867     <Destination>:14040    Destination:14040

 

Thanks.

Joby

 

1 Reply 1

Hi Joby,

What are you trying to accomplish or are you asking just for clarification on whats happening? Also what traffic do you have going through there thats being natted? 

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