VPN IPSec ASA with two ISP active

Hi ALL!

I have a question.

So I have ASA with 9.2 (1) SW connected to ISP with active SLA.

I need to configure redundant IPSec VPN via ISP2, while all other traffic must go through isps1. In case if one of the ISP goes down all including VPN traffic must be routed via ISP alive.

I have configured SLA and it works.

ciscoasa # display route performance
Route 0.0.0.0 isps1 0.0.0.0 10.175.2.5 5 track 1
Route isp2 0.0.0.0 0.0.0.0 10.175.3.5 10 track 2
Route isp2 172.22.10.5 255.255.255.255 10.175.3.5 1 excerpt 2

Here we can see if isps1 and ISP2 are RISING, all traffic passes through isps1, but traffic intended for the remote peer IPSec 172.22.10.5 passes by ISP2.

This configuration works just at the moment when isps1 or isp2 is down or if a static route for 172.22.10.5 deleted. Where two Internet service providers are increasing to ASA does not send the next remote IPSec datagrams.

ciscoasa # display running nat
NAT (inside, isp2) source static obj-INSIDE_LAN obj-INSIDE_LAN destination static obj-REMOTE_LAN obj-REMOTE_LAN no-proxy-arp-search to itinerary
NAT (inside isps1) source static obj-INSIDE_LAN obj-INSIDE_LAN destination static obj-REMOTE_LAN obj-REMOTE_LAN no-proxy-arp-search to itinerary

Crypto ipsec transform-set ikev1 ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
Crypto ipsec pmtu aging infinite - the security association
card crypto cm_vpnc 10 correspondence address acl_vpn
card crypto cm_vpnc 10 set pfs
peer set card crypto cm_vpnc 10 172.22.10.5
card crypto cm_vpnc 10 set transform-set ESP-AES-256-SHA ikev1
86400 seconds, duration of life card crypto cm_vpnc 10 set - the security association
card crypto cm_vpnc interface isps1
cm_vpnc interface isp2 crypto card
trustpool crypto ca policy
isps1 enable ikev1 crypto
isp2 enable ikev1 crypto
IKEv1 crypto policy 1
preshared authentication
aes-256 encryption
sha hash
Group 2
life 86400

ciscoasa # show ip
System of IP addresses:
Subnet mask IP address name interface method
Vlan1 in 192.168.2.1 255.255.255.0 CONFIG
Isps1 Vlan2 10.175.2.10 255.255.255.0 CONFIG
Isp2 Vlan3 10.175.3.10 255.255.255.0 CONFIG

The main question why?

Thank you in advance,

Anton

Hi anton,.

If you check the log message on your ASA R301-IS , he's trying to build the tunnel VPN with both IP and it receives packets of asymmetrically your distance ciscoasa.

TO avoid this asymmetrical connection, point your IP from peers as primary & secondary on your R301-EAST

set peer 10.175.3.10 10.175.2.10

Delete the track on your routing entries

Route isp2 172.22.10.5 255.255.255.255 10.175.3.5

This should work for you.

Similalry lower your ISP 2, you should see VPN tunnel is mounted with isps1 one.

HTH

Sandy

Tags: Cisco Security

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