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Beginner

Help: Issues adding to encryption domain IPsec Tunnel

Good Evening All,

I am seeking help and/or advise in regards to adding more networks to the encryption domain of an existing site to site IPsec tunnel.  Both sides of the tunnel are ASA's.  The customer on the remote end is wanting access to more networks on my end.  They have already updated their crypto map ACL to include the new networks.  When they perform "show crypto IPsec sa peer x.x.x.x" it already shows encap packets attempting to reach my network. 

On my side, I updated my crypto map ACL to reference the 2 new networks, created the twice NAT, and added the necessary ACL's to allow inbound access via the ports they want.  When I perform a "show crypto IPsec sa peer x.x.x.x" the output is NOT updated with the new networks added to the encryption domain.  When I run a packet tracer sourcing from one of the servers in the new network, traffic is being translated as it should, but being dropped when it hits the outbound interface to get on the VPN tunnel. 

Am I missing something here? Do I need to bounce the tunnel in order for the new networks to be recognized in the SA?

Thanks in advance.

1 ACCEPTED SOLUTION

Accepted Solutions
Beginner

Hello,

Hello,

You must bounce the tunnel whenever you modify the interesting traffic otherwise the new SA is not going to be created, is kind of funny that you say that the SA is already build at the remote side, the SA cannot be established only in one side, is like building a new tunnel if you don't have it in one side it can't just establish itself and create the entry for the SA. Besides adding the new networks and bouncing the tunnel you need to generate traffic to trigger the new SA or you will never see it created. Check your no nats and routing and it should work.

Regards, please rate.

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6 REPLIES 6
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Advisor

If the remote end is showing

If the remote end is showing it is encrypting packets to you, but you are not showing as decrypting packets from them then the issue definitely seems to be on your end.

I guess you could try clearing the related SA, and make sure it rebuilds.  You definitely need that bit right first.

I'm not sure I can offer much more help without seeing your config and understanding the topology.

Highlighted
Beginner

I don't have access to the

I don't have access to the configs at the moment, but basically I have object groups "LOCAL-NETS and REMOTE-NETS" that my crypto map ACL references.  I just added the networks into the LOCAL-NETS object group.  But when I perform a "show crypto IPsec sa" its not showing the new networks.  Adding them to the crypto map should add them to the encryption domain, correct?

Highlighted
Advisor

Yes, that should add them to

Yes, that should add them to the encryption domain on your end.  Have you added them to any relevant NAT configuration as well (like the existing encryption domain)?

Beginner

Hello,

Hello,

You must bounce the tunnel whenever you modify the interesting traffic otherwise the new SA is not going to be created, is kind of funny that you say that the SA is already build at the remote side, the SA cannot be established only in one side, is like building a new tunnel if you don't have it in one side it can't just establish itself and create the entry for the SA. Besides adding the new networks and bouncing the tunnel you need to generate traffic to trigger the new SA or you will never see it created. Check your no nats and routing and it should work.

Regards, please rate.

View solution in original post

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Beginner

Just curious, but when the SA

Just curious, but when the SA expires and rekey's will the new networks then be included if I don't bounce the tunnel?

I believe I have my ACL's and NAT correct, when I run a packet tracer the traffic of the new network is getting dropped when hitting the tunnel.  (which I believe will be resolved when I bounce it)

Highlighted
Beginner

When a rekey happens the

When a rekey happens the current SAs will negociate new ones I don´t think the tunnel will actually drop on every rekey.

I recently worked on a case where a new SA was not coming up while I got the configuration from the customer and I reviewed it took like 2 days all the configuration was fine but up until we manually bounced the tunnel the SA was able to establish, a couple of rekeys definitely occurred during those 2 days.

When you modify the interesting traffic you just bounce the tunnel you don´t wait for the next rekey to occur for the SA to come up but based on that experience I will say rekey wont make it. Give it a try manually dropping it an let us know.