I'll look up to this doc. Had you had time to test it in your lab yet ?
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Nating on a secondary's interface address
Hi All
Here's my simple configuration
Interface Ethernet1
description WAN
ip address 20.20.20.20 255.255.255.0
ip address 20.20.20.21 255.255.255.0 secondary
ip nat outside
Interface Ethernet0
description LAN
ip address 10.10.10.1 255.255.255.0
ip nat inside
I want to Nat directly connected LAN subnet and a few other ones (10.10.11.0/24, 10.10.12.0/24) throught my secondary address only (20.20.20.21 overload).
How can I do that. I try with route-map but it doesn't work. I also try with like this :
ip nat pool NAT_Pool 20.20.20.21 20.20.20.21 prefix-length 32
ip nat inside source list 2 pool NAT_Pool overload
!
access-list 2 permit 10.10.10.0 0.0.0.255
access-list 2 permit 10.10.11.0 0.0.0.255
access-list 2 permit 10.10.12.0 0.0.0.255
But it's still doesn't work.
Thank you very much !
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Answers
well
although the secondary ip address is in the same subnet as the primary which sounds strange to me
however it worked for me with no problems
below is my config i used loopback interfaces on another router for testing
R3 with lan subnets --------------- R4 with inside and outside interfaces ------------ R5 outside router
Thank you very much. I'll test it maybe tomorrow.
But when you use this "ip nat pool TEST 20.20.20.21 20.20.20.21 prefix-length 30", does it meens you'll probably nat over a range of 4 address (like .20, .21, .22, .23).
It's why I use a /32 prefix, but I think it's the issue. The OS doesn't take a /32 prefix even if he lets me write it down. What are you thinking about that ?
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by: logic2Posted on 2009-10-22 at 19:00:44ID: 25640845
i will try this in lab environment and advise back
however maybe during this time you can go through this document about nat on a stick
it might help you with some manipulation
http://www.cisco.com/en/US