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New Member

Two s-t-s tunnels to same network - asa

  Hi,

i am configuring VPN solution between  3 sites. Site A is remote office that connects to HQ office witch is site B.

Site C is disaster recovery site that connects by L2VPN to site B (HQ) so they are in same network/subnet and i threat them as single site from the VPN routing point of view. Each site has it's own asa appliance.

Can i create to VPN tunnels to same remote subnet (site B and site C are in the same subnet) and tell ASA to use one of those tunnels as primary?

What is your opinion for solutioning this kind of VPN, how would you do it?

Please see attach for info.

Tnx,

Srdjan

2 REPLIES
Cisco Employee

Two s-t-s tunnels to same network - asa

Hi,

If you do not need both the tunnel active at the same time and want to use them as primary and back up you need only one crypto map on the ASA and add both the IP as primary and back up.

Forexample.

On Site B and C you will have the normal site to site VPN configuration.

On site A you need to do the following:

access-list vpn permit ip 192.168.1.0 255.255.255.0 192.168.100.0 255.255.255.0

crypto map outside_map 10 set transform-set VPN

crypto map outside_map 10 set peer x.x.x.x (site B) x.x.x.x (site C)

crypto map outside_map 10 match address vpn

crypto map outside_map interface outside

tunnel-group x.x.x.x (IP of site B) type ipsec-l2l

tunnel-group x.x.x.x (IP of site B) ipsec-attribute

pre-share-key cisco123

tunnel-group x.x.x.x (IP of site C) type Ipsec-l2l

tunnel-group x.x.x.x (IP of site C) ipsec-attribute

pre-share-key cisco123

So in short you need to create only one crypto map on site A and define the IP address of Site B and C as peer.

And create 2 tunnel-group with the same pre-shared key.

SO which ever IP you will use first in the set peer command will become primary and other will become back-up.

I hope this answers your question. Please let me know if you have any other question.

Thanks

Jeet Kumar

New Member

Two s-t-s tunnels to same network - asa

Hi,

Thank You for reply, i will try this in few days on site and let You know is it working.

Tnx again,

Srdjan

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