05-26-2009 04:21 AM
Is it possible to define port-based ACL's (with-in crypto ACL) on L2L (site-to-site) VPN's with routers? Cisco seems to say it is possible, but not recommended.
Thanks,
Brandon
05-26-2009 05:41 AM
Brandon-
It is possible (we have one tunnel like that). The ACLs must match exactly on each side.
Hope that helps.
05-26-2009 06:23 AM
Hi Collin,
So something like the below crypto-ACL on a router should work so long as the peer's ACL is a mirror image?
ip access-list extended xyz-company
permit tcp host 10.10.10.10 host 11.150.116.3 eq telnet 22 ftp www 443 8080 3052 5631 5632
permit tcp host 10.10.10.10 host 11.150.116.3 eq telnet 22 ftp www 443 8080 3052 5631 5632
Thanks,
Brandon
05-26-2009 06:25 AM
Yup
05-26-2009 06:27 AM
Very cool.
I wonder why Cisco says it "should Work", but is not recommended on IOS (routers)?
Thanks,
Brandon
05-26-2009 06:29 AM
It is the most common thing people get wrong when configuring VPN's. A simple subnet-to-subnet ACL is a lot easier to troubleshoot.
05-26-2009 06:33 AM
I got, makes sense. So configuring a basic L2L (site-to-site) VPN with between simple host or subnets AND filtering by just "IP" is much, much easier than filtering by protocol since you have to have an exact match on both sides.
Then it is not becuase of a performance or functionality issue that Cisco recommends against it.
Thanks,
Brandon
06-05-2009 12:17 PM
Hi Collin,
I am having a bit of trouble trying to get this to work in a test lab using the routers. Can you please send a ACL and the key config snippets?
Thanks,
Brandon
06-09-2009 05:47 AM
06-09-2009 07:39 AM
Hi Collin,
Thanks for the example. Unless I am over looking it, isn't there supposed to be a route statement for the VPN to know how to get to the remote host?
Thanks,
Brandon
06-09-2009 07:53 AM
That's one of those weird things. In this example I don't have one, but in some others I need them. I've never found a determining factor of when one is needed or not.
06-09-2009 09:14 AM
That's odd, and interesting at the same time.;-)
Thanks,
Brandon
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