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IOS VPN with conflicted IP Addressranges (ISR 1841)

Robert_Berger
Level 1
Level 1

Hello everybody,

can someone help by this configuration:

10.5.0.0 is used on VPN1 and VPN2 side. Therfore i need to NAT spezial traffic on Router B.

example USING 10.254.0.11 as dummy to go to 10.5.0.11 by VPN-Tunnel-2

Router B should NAT back from 10.254. to 10.5. and this only by traffic from and to 80.x.x.x

********

ROUTER A

********

crypto map my_cry 19 ipsec-isakmp

set peer 80.z.z.z

...

match address VPN1

ip access-list extended VPN1

permit ip host 80.x.x.x 10.0.0.0 0.31.255.255

!

crypto map my_cry 20 ipsec-isakmp

set peer 80.y.y.y

...

match address VPN2

!

ip access-list extended VPN2

permit ip host 80.x.x.x 10.254.0.0 0.0.1.255

!

********

ROUTER B

********

!

crypto map my_cry 20 ipsec-isakmp

set peer 80.x.x.x

...

match address VPN1

!

ip access-list extended VPN1

permit ip 10.254.0.0 0.0.1.255 host 80.x.x.x

!

ip access-list extended NO-NAT

deny ip 10.5.0.0 0.0.1.255 10.5.200.0 0.0.0.255 ... other VPN LAN-LAN connect's

deny ip 10.5.0.0 0.0.1.255 host 80.x.x.x

permit ip 10.5.0.0 0.0.255.255 any

!

ip access-list extended NET-MAP

permit ip 10.5.0.0 0.0.1.255 host 80.x.x.x

deny ip any any

!

route-map RMAP permit 1

match ip address NO-NAT

!

route-map NET-RMAP permit 10

match ip address NET-MAP

!

ip nat inside source route-map RMAP interface FastEthernet0/1 overload

ip nat inside source static network 10.5.0.0 10.254.0.0 /23 route-map NET-RMAP no-alias

!

Example close to (based on):

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a00800b07ed.shtml

I can see incoming traffic "sh nat tr" but it translate me from 10.254.0.11 to 10.5.0.0 ...

Thank's Robert

2 Replies 2

umedryk
Level 5
Level 5

I think this could be an error in configuring the IP address. You need to check every IP address and verify if that is what you wanted to assign...

At the moment i have insert the following statments:

ip nat inside source static 10.5.0.11 10.254.0.11 route-map NET-RMAP extendable

ip nat inside source static 10.5.1.2 10.254.1.2 route-map NET-RMAP extendable

ip nat inside source static 10.5.1.3 10.254.1.3 route-map NET-RMAP extendable

and so on for the importants connections.

But that can not be a sollution ..... I hope there is a better way to map a 23 Bit class fully as in each line...

Robert

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