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route-map nonat permit 10 ?

Posted on 2003-12-01
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Last Modified: 2007-12-19
What is this command doing?

route-map nonat permit 10
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Question by:gateguard
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by:Pete Long
ID: 9850672
Hi gateguard,
See Irmoores comments here http://oldlook.experts-exchange.com/Hardware/Routers/Q_20705266.html

PeteL
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by:Pete Long
ID: 9850687
gateguard,
! *  Use a route map to define which traffic from the private

! *  network should be included in the NAT process:

 

route-map nonat permit 10

 match ip address 150

http://www.siliconvalleyccie.com/cisco-hn/vpn-cisco.htm
PL
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Robing66066 earned 300 total points
ID: 9852664
That looks like a line in a VPN router config.  If so, there should be a corresponding line that says something like '
ip nat inside source route-map nonat interface Ethernet0 overload '

Basically, it differentiates VPN 'interesting traffic' from traffic bound for the Internet. As Pete shows, it should be followed by a match ip address line that you can line up with an access list line (such as 'access-list 150 permit ip 10.10.130.0 0.0.0.255 10.10.0.0 0.0.255.255').  Whatever is in the access list is enacted on the traffic heading to the Internet.

So, if you had this in your config:

ip nat inside source route-map nonat interface Ethernet0 overload
route-map nonat permit 10
   match ip address 150

access-list 150 deny   ip 10.10.130.0 0.0.0.255 10.10.0.0 0.0.255.255
access-list 150 permit ip 10.10.130.0 0.0.0.255 any

All traffic from 10.10.130.0 destined for 10.10.0.0 would be denied access to the Internet.
All traffic from 10.10.130.0 destined for anywhere else would be allowed out to the Internet.  (And NATted.)

I *believe* that the 10 reference speaks to the number you used for your crypto isakmp policy, but I'm not sure.
 

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Expert Comment

by:Robing66066
ID: 9852667
That looks like a line in a VPN router config.  If so, there should be a corresponding line that says something like '
ip nat inside source route-map nonat interface Ethernet0 overload '

Basically, it differentiates VPN 'interesting traffic' from traffic bound for the Internet. As Pete shows, it should be followed by a match ip address line that you can line up with an access list line (such as 'access-list 150 permit ip 10.10.130.0 0.0.0.255 10.10.0.0 0.0.255.255').  Whatever is in the access list is enacted on the traffic heading to the Internet.

So, if you had this in your config:

ip nat inside source route-map nonat interface Ethernet0 overload
route-map nonat permit 10
   match ip address 150

access-list 150 deny   ip 10.10.130.0 0.0.0.255 10.10.0.0 0.0.255.255
access-list 150 permit ip 10.10.130.0 0.0.0.255 any

All traffic from 10.10.130.0 destined for 10.10.0.0 would be denied access to the Internet.
All traffic from 10.10.130.0 destined for anywhere else would be allowed out to the Internet.  (And NATted.)

I *believe* that the 10 reference speaks to the number you used for your crypto isakmp policy, but I'm not sure.
 

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