topic Re: ASA management over IPsec VPN in Network Security

ASA management over IPsec VPN

attilafejes — Fri, 21 Feb 2020 14:27:37 GMT

Hi There!

Has anyone configured a dedicated management IPsec tunnel for ASA management which is in Active / Standby mode?

For a standalone device it is working fine as per the documentation by applying the management-access inside command etc...

However, if I use a failover pair the tunnel is building up only the primary ASA, the Secondary device shows it as a "Standby" tunnel.

I am able to ping / ssh to the primary ASA's inside interface, but not to the Secondary one. The secondary actually receives the traffic, however it is doing a route lookup and sending towards to the "outside" where the tunnel is actually in "Standby".

My goal would be that both devices are reachable from the management systems over the VPN, so it can health checked / snmp polled / sshd etc... Like if it were managed over a physical interface.

Thanks!

Re: ASA management over IPsec VPN

Josue Brenes — Tue, 10 Oct 2017 02:39:03 GMT

Hi,

You are right. The traffic will get to the standby unit and will try to be routed over the outside.
In order to fix this, you need to NAT the remote traffic to the inside interface of the primary ASA so the traffic will be returned over the inside network.

Remote site: 192.168.2.0/24
Inside network of ASA's: 192.168.1.0/24
Inside inteface ip address standby ASA: 192.168.1.2

object network Remote_site
network 192.168.2.0 255.255.255.0
object network standby_ASA
host 192.168.1.2

nat (outside,inside) source dynamic Remote_site interface destination static Stanby_ASA Stanby_ASA

management-access inside
ssh 192.168.2.0 255.255.255.0 inside

Rate if it helps.

Regards,
Josue Brenes
TAC - VPN Engineer.

Re: ASA management over IPsec VPN

attilafejes — Tue, 10 Oct 2017 10:44:18 GMT

Thanks for the reply Josue! I need to check it in my lab. I will test it soon and get back to you with the results.

Regards, Attila

Re: ASA management over IPsec VPN

GN974 — Wed, 27 Feb 2019 12:56:45 GMT

Thanks Josue,

But what will happen when the secondary(Standby) firewall initiates a traffic to a tacacs server for authentication, which is hosted over the vpn tunnel.

The solution you have provided will only work in one direction, from remote site to secondary firewall.

I heard of new feature in 9.5 version , Separate routing table for management-only interfaces , can we apply this concept here

if yes , please explain .

Regards,