VPN setup on mikrotik router

Question

I have successfully setup a pptp vpn server on a Mikrotik routerboard. I am able to connect to the VPN and can successfully access a certain IP range.

This is my setup:

ADSL modem/router - mikrotik router -> private community network (CTWUG)

IP range at home is a subset of the larger CTWUG network range : 172.18.107.224/28 The CTWUG network rage : 172.18.0.0/16

• In my home setup the mikrotik router acts as the gateway and router. IP: 172.18.107.238
• The ADSL router acts as the DHCP server. IP : 172.18.107.237
• There is a route on the mikrotik for access to the CTWUG range: 172.18.0.0/16 -> 172.18.107.252
• And a route for internet access 0.0.0.0/0 -> 172.18.107.237 (ADSL modem)
• For the VPN the local ip issued is 172.18.107.236 and remote ip issued is 172.18.107.235
• On my ADSL modem I have setup port forwarding on port 1723 TCP to 172.18.107.238 (mikrotik)

The problem and question is: I am able to access the complete CTWUG range 172.16.0.0/16 except my home range 172.18.107.224/28. I have torched the pptp(VPN) interface and I can see the packets for my local range being forwarded to the device on my local range. There is just no packets returning over the VPN. Any help please.

Solution

Problem solved. Had to change the ARP on my local ethernet to arp-proxy and change the local vpn proxy to that of my mikrotik router.

Comments

[David Schwartz]

The default gateway on the destination network needs to know to forward the return packets to the VPN endpoint.

[Grizly]

Can you explain the last part, I'm trying to get this working too, what does "local vpn proxy" mean?

[Grizly]

Nevermind, contacted my reseller and they explained that you only need proxy-arp if your vpn clients are sharing the same subnet.. I've been a fool!