Monday, February 25, 2019

Remotely access switches behind an ASA5525X

I am upgrading a new remote office using an ASA5525X as our gateway with (3) 2960Xs behind that for the LAN-call it Site A

With the understanding that I cannot SSH to the ASA then SSH from the ASA to the switches underneath I am working on trying to find a way to be able to access these switches remotely.

We currently have an IPSEC VPN Tunnel to this office that allows Site A's internal subnet (192.168.5.0/24) to talk to the HQ subnet of 192.168.10.0/24.

I have the switches setup 192.168.5.5 - 192.168.5.6 - 192.168.5.7 with the default gateway to ASA as 192.168.5.1.

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I have been doing some digging and seen something in regards to NATing these internal switches IPs OUT to a specific port and using the external IP of the ASA with that port to access them. Below is a config I am implementing on the ASA.

Has anyone used this method or believe it will work?

object network SW1

host 192.168.5.5

object network SW2

host 192.168.5.6

object network SW3

host 192.168.5.7

!

object-group network SSH_Switches

network-object object SW1

network-object object SW2

network-object object SW3

!

object network SW1

nat (inside,outside) static interface service tcp ssh 22111 (Not the ports I am using just an example)

!

object network SW2

nat (inside,outside) static interface service tcp ssh 22112 (Not the ports I am using just an example)

!

object network SW3

nat (inside,outside) static interface service tcp ssh 22113 (Not the ports I am using just an example)

!

access-list Outside extended permit tcp 192.168.10.0 255.255.255.0 (HQ Office subnet) object-group SSH_Switches eq 22

!

Any help/confirmation much apprecaited.



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