Hi, i’ve got two RB750 and want to use them to link two households with a VPN tunnel.
Each hosehold is using a Thomson TG789vn as WAN modem/router.
Any suggestions on how I should set this up in the RB750’s?
//Stefan
LOTS of examples in the Wiki. You can use IPSec, OVPN, PPTP, L2TP, etc… I would suggest L2TP or IPSec. Look in the wiki for exact examples of this situation.
Save yourself lots of headaches = You should put your ISP modems into bridge-mode so your routers are getting a public IP address, and not a private IP.
Been trying to get this to work and think I’ve got it set up with IPsec as the wiki explains, but can’t get a connection.
I’ve attached a diagram of what I’m trying to do, any help would be much appreciated.
Happy new year 
Again… save yourself headache and put both of your ISP modems into bridge-mode so your Mikrotik’s receive a public IP address (NO port forwarding)
You have both of your Mikrotik routers natted behind ISP modems… this makes it MUCH more complicated for IPSec. You are going to have to research IPSEC NAT-T for NAT to work with IPSec… which in the past has not worked very well with Mikrotik.
Also… with the port forwarding, are you forwarding the IPSEC protocols? Or just the TCP protocols? It makes a difference…
Thanks, but I cant bridge the TG789, there limited by the ISP to a minimum of functions 
Can you suggest any other type of VPN that might be easier to use in this case?
L2TP is much more NAT friendly. Forward UPD/1701 on both ISP routers to the Mikrotik, and setup L2TP from Mikrotik-to-Mikrotik.