Policy based IPSEC tunneling is probably the most widely used technique to get two offices to communicate securely (at least in the SMB Market).
Last week I updated a Cisco ASA HA cluster within a work project. The customer runs about 200 EasyVPN and IPsec VPN Site2Site connections. Our goal was to update the Cisco ASA HA cluster without an interrupt. The installed firmware version was 8.6(1)2 and we wanted to go straight to 9.4(2)11. Design Network With Cluster Asa 5516 Vpn Remote Access And Fortigate Log Vpn Acce. Implementing VPN Clustering requires a virtual cluster by logically grouping two or more ASA’s or VPN concentrators on the same subnet. To outside client, virtual cluster looks like a single device accessible by a single virtual ip address. A VPN client attempting a VPN session connects first to this virtual address but it quickly.
Today I’m going to discuss how you can configure two ASA’s to failover to their secondary WAN, and then have their tunnels fail over as well.
One should always aim for having two ISPs if the business needs to rely on the tunnel. The question to ask ones self is “If this tunnel goes down, can I continue working?”
If the answer is no, then you need a secondary ISP at a minimum.
I’m going to begin the config for ASAv-1 (left network)…
First let’s get some basic “optimizations” out of the way:
The below allows the asa to keep track of ICMP and let it pass through (does it by IP and expected code reply)
The first command prevents TCP fragmentation in the future tunnels by clamping the MSS.
The second command preserves session tables if the VPN bounces (quicker recovery).
Now let’s configure the LAN and WAN and their security levels.
Configure an IP SLA monitor to ping google via the first outside interface.
Connect a track object to the IP SLA so we can reference in the route later.
Tell the ASA to use Outside as the primary WAN and failover to Outside2 when the track object fails.
Configure basic dynamic PAT for both WAN interfaces.
Now let’s configure the VPN:
Enable ikev1 listening on both WAN interfaces.
Set our preferred IKE policy for all VPNs. Uami ndongadas mixtape.
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Create the tunnel groups for both WAN links on the other side, with the same shared secret.
Configure the ACL for matching the traffic to be protected.
Configure the IPSEC encryption parameters.
Configure the crypto map for the tunnel, with two peers, then add it to both WAN interfaces.
Finally configure the identity NAT so that the traffic traverses properly.
Now let’s configure the right network’s ASA. I will put that whole config down here since it’s basically a mirror.
Use the “show vpn-sessiondb l2l” command to view the status of the tunnel, like below.
A healthy tunnel will have both TX and RX Bytes showing.
An unhealthy tunnel will either show “There are presently no active sessions” or it might show some TX or RX, but not both.
It also helps of course to just ping across the tunnel, here I am pinging from 2.10 to 1.10.
Ok now let’s initiate some failover and test:
Shut down the primary WAN on ASA 2 (right network). Let’s confirm which interface that is:
Perfect, looks to be G0/0 as we expected.
Run this debug command to confirm IPSEC failover.
Ok now shut off int g0/0.
Ok let’s confirm the track object did its job and failed over to our static default route with an AD of 2.
Asa Vpn Cluster Load Balancing
![Cluster Cluster](/uploads/1/1/3/6/113648129/985564710.gif)
Yup, looks like we are good there.
Asa Vpn Clustering
Now If I ping again from 2.10 to 1.10 the tunnel should renegotiate. Download animasi bergerak.
Cisco Asa Vpn Cluster Anyconnect
We also would see these decrypt messages from the ASA.
Perfect the failover worked. Now do an “undebug all” in global config mode to return the ASA back to normal.