I have setup the L2TP VPN Client on a MikroTik router in a branch office to connect to our L2TP VPN Appliance in our main office. The MikroTik connects no problem and is able to ping clients on the main office LAN, but clients that are connected to the MikroTik aren’t able to connect to the same main office LAN. I’ve tried adding firewall and NAT rules from other questions on the forum, but haven’t been able to figure out what needs to be added for the MikroTik to let it’s clients also communicate across the VPN. Any suggestions? Thanks!
If the Mikrotik at branch offices communicate properly, then it sounds like the devices at the main office does not know where to route the subnet for branch office to, so ensure you have a route at main office for th branch office subnet pointing to the branch office as gateway