Monday, March 5, 2018

[Troubleshooting] ASA L2L NATing

Hi,

I've recently acquired ownership of our networking equipment while a new Network Engineer is being hired and I'm having a bit of trouble around NATing. Specifically I've just linked two sites via an ASA L2L tunnel which works mostly fine however there is a quirk.

The two networks can connect to eachother without incident but you cannot ping/ssh the DMZ interface (used for management) on Network A's ASA from Network B's ASA and vice versa. All VMs in each network are pinging eachother without issue.

See below:

Network A: networka-1# sh run interface

!

interface Ethernet1/1

description DMZ

nameif DMZ

security-level 50

ip address xxx.xxx.50.107 255.255.255.248 standby xxx.xxx.xxx.108

!

[...]

interface Ethernet1/5.50

description INET_COMCAST

vlan 50

nameif INET_COMCAST

security-level 0

ip address xxx.xxx.xxx.183 255.255.255.252

!

networka-1# sh run nat

nat (any,INET_COMCAST) source static netobj_local_network netobj_local_network destination static netobj_dr-network netobj_dr-network no-proxy-arp route-lookup

nat (any,INET_COMCAST) source static netobj_local_network netobj_local_network destination static netobj_client-vpn netobj_client-vpn no-proxy-arp route-lookup

!

Network B: networkb-1# sh run interface !

interface Ethernet1/1

description DMZ

nameif DMZ

security-level 50

ip address xxx.xxx.150.107 255.255.255.248

!

[...]

interface Ethernet1/5.50

description INET_COMCAST

vlan 50

nameif INET_COMCAST

security-level 0

ip address xxx.xxx.xxx.201 255.255.255.252

!

networkb-1# sh run nat

nat (any,INET_COMCAST) source static netobj_local_network netobj_local_network destination static netobj_dr-network netobj_dr-network no-proxy-arp route-lookup

nat (any,INET_COMCAST) source static netobj_local_network netobj_local_network destination static netobj_client-vpn netobj_client-vpn no-proxy-arp route-lookup



No comments:

Post a Comment