Route traffic from LAN to OpenVPN Client network



  • Hi,

    I've configured my pfsense as an openvpn client in order to access the 172.21.0.0/16 network, the connection is ok and it pushes the route to 172.21.0.0/16 network and from pfsense i can ping ips from 172.21.0.0/16 network.

    But now i want to access the 172.21.0.0/16 network from my LAN network, i've configured this rule on pfsense:

    ID Proto Source Port Destination Port Gateway Queue Schedule
    IPv4 * LAN net * 172.21.0.0/16 * *         none

    But still no luck, do i need anything else to make it work?


  • Rebel Alliance Global Moderator

    why would you need that rule - isnt there already a lan rule that say lan net to anything allowed?  This is the default lan rule.

    the routes should already be in there.  What is pfsense route table look like?  If pfsense can ping clients in 172.21/16 then clients on its lan should be as well from the rules.  What is most likely is the problem is your outbound nat.

    How does the remote network know to talk to your lan clients IP?  What are you lan clients network?  Are you natting your clients to pfsense vpn connection IP?



  • @johnpoz:

    why would you need that rule - isnt there already a lan rule that say lan net to anything allowed?  This is the default lan rule.

    the routes should already be in there.  What is pfsense route table look like?  If pfsense can ping clients in 172.21/16 then clients on its lan should be as well from the rules.  What is most likely is the problem is your outbound nat.

    How does the remote network know to talk to your lan clients IP?  What are you lan clients network?  Are you natting your clients to pfsense vpn connection IP?

    My rules are to block everything unless i allow it first.

    My LAN is 192.168.2.0/24, and on the remote side there is also a lot of 192.168.X.X networks, so they are natting all 192.168.0.0/16 to 172.21.0.0/16.

    I think the problem is that i'm not natting my LAN clients to pfsense vpn connection.

    On the remote server they see messages on their openvpn logs like:

    MULTI: bad source address from client [192.168.2.10], packet dropped.


  • Rebel Alliance Global Moderator

    Well you shouldn't have to nat if you don't want to..  They just need a route back..  But using 192.168/16 means they overlap your network - is that a typo?

    Your not going to want to have the same networks on both sides of your vpn connection.  Either change your network to something other 192.168 or why and the hell are you using /16's for vpn and do they really have so many machines they need a /16 – all in 1 broadcast domain? ;)



  • @johnpoz:

    Well you shouldn't have to nat if you don't want to..  They just need a route back..  But using 192.168/16 means they overlap your network - is that a typo?

    Your not going to want to have the same networks on both sides of your vpn connection.  Either change your network to something other 192.168 or why and the hell are you using /16's for vpn and do they really have so many machines they need a /16 – all in 1 broadcast domain? ;)

    They have 192.168.2.0/24, 192.168.200.0/24, 192.168.201.0/24, 192.168.10.0/24, 192.168.5.0/24, 192.168.20.0/24.

    On my side i also have 192.168.2.0/24 and 192.168.10.0/24, so these two overlap.



  • I've configured an oubound NAT to nat my LAN clients accessing 172.21.0.0/16 to the OpenVPN connection IP, and it fixes my problem.