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ASA5505 VPN overlapping traffic selection

Posted on 2009-07-14
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Can I overlap VPN traffic selection subnets?

I have a triangle of 3 ASA5505s running version 8.x.  A very large amount of subnets, and the internet, are behind the main unit (we'll call it unit 1).  Unit 2 and 3 connect into unit 1 fine.  The traffic selection for the VPN on units 2 and 3 is "local subnet to ANY".  

The problem arises when I set up a VPN between units 2 and 3.  Since the "local subnet" for both unit 2 and 3 are included in "ANY" (hitting the traffic selection for unit 1 VPN), the session between units 2 and 3 will not even attempt to come up because it's hitting the "local to ANY" rule.  

I tried inserting a "don't protect the other units subnet" statement before the "local subnet to ANY" line on units 2 and 3 hoping it would skip to the second traffic selection rule, but it did not work.  (i.e. on unit 3, don't tunnel traffic for bound for unit 2 in the unit 1 tunnel)

Any ideas are appreciated.  Thanks.  Mike
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Question by:Avi8r
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Expert Comment

by:MikeKane
ID: 24852705
<I tried inserting a "don't protect the other units subnet" statement before the "local subnet to ANY">

Do you mean you tried adding a deny before the permit?  Something like this?

Access-list crypto_1 deny <local subnet> <site 3 subnet>
Access-list crypto_1 permit <local_subnet> any


Remember the crypto maps need to match exactly.  

As another option, you could just try to make the Site2 to 3 vpn tunnels higher on the list so they execute 1st and move the original tunnel lower on the list.


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Author Comment

by:Avi8r
ID: 24852852
"As another option, you could just try to make the Site2 to 3 vpn tunnels higher on the list so they execute 1st and move the original tunnel lower on the list."

How do I bump them up?  I do everything through ASDM and the "move up" buttons are grayed out.  


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MikeKane earned 500 total points
ID: 24853085
Not sure how to move it, but you can recreate it I think.  

In the ASDM, try using CONFIGURATION - SITE to SITE VPN - Advanced - Crypto map        Then click Add in the rules window and create the new IPSEC rule with priority 1 (or something higher than the original Site 1 rule).    You'll need to tweak the VPN to use this instead, but it should match before the Site 1 traffic identifying rule and use that for establishing the tunnel.  

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Author Comment

by:Avi8r
ID: 24911039
Thanks Mike.  Will try this during my next maintenance window.
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Expert Comment

by:MikeKane
ID: 24919668
Good.   Let me know how it goes.
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Author Closing Comment

by:Avi8r
ID: 31603406
The crypto maps definately need to be in the right order!  The crypto map priority can be changed under "Configuration, Site-to-Site VPN, Advanced, Crypto Maps.  

Thanks for the help!
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