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Webcast-Catalyst9k
New Member

NAT issue: traffic entering/leaving same interface not NATed

Network setup: 1 Cisco 2600 router with a serial0/0 and fastethernet0/0 interface. The serial is connected to the ISP (me) and the faste connects the LAN. Serial0/0 has a public IP and is a NAT outside interface, while faste0/0 is a private IP and a NAT inside interface. Both static and overloading NAT are in use. The static NAT is to allow access to the web server and the PAT is for local users to access the internet.

Issue: Local users attached to the faste0/0 interface are not able to connect to the web server using the inside-global IP.

4 REPLIES
Silver

Re: NAT issue: traffic entering/leaving same interface not NATed

Since you come in and leave out from the same interface, Natting will not happen for this traffic. For this you may need to perform NAT on stick to perform the natting.

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094430.shtml

This link should help you

New Member

Re: NAT issue: traffic entering/leaving same interface not NATed

Thank you. That is what I am thinking, that I would need another layer 3 interface so that an actual inside-outside or outside-inside traversal occurred. In this case, it is inside-inside.

Bronze

Re: NAT issue: traffic entering/leaving same interface not NATed

Hi,

Please try to change ur access-list 1 to deny the ip address that are defined in static natting.

The problem is ur dynamic natting is overtaking ur static natting statements.

Check the link

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_q_and_a_item09186a00800e523b.shtml#qa17

Hope this helps

Thanks

Raj

New Member

Re: NAT issue: traffic entering/leaving same interface not NATed

Thanks for the tip I will check on that.

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