Hello guys,

I have 3 subnets in 3 different offices.

Office #1: 192.168.0.1/24
Office #2: 192.168.100.1/24
Office #3: 192.168.200.1/24

Each office has a MK RouterBoard Router with Dual WAN Configuration.
All the WAN interfaces have static public IP addresses.

Now I would like to connect them into one single network so that every device connected on any network can access any other device connected to any of the 3 networks.

I managed to complete this to roughly 80%.

I've done a Site to Site IPsec Tunnel between the 3 offices in RouterOS and everything seems to be working but it's not quite what I want.

What is working:
[*] I can ping SOME devices throughout the network (ex.: I can ping devices connected to Office #1 from Office #3, etc).

What is not working:
[*] I can't ping Widows PC's with firewall activated, although local pinging from the MK router that the PC is directly connected to works flawlessly.
[*] I can only access some ports through the IPsec tunnel. Example: I can access a office #3 remote AP web administration page (port 80) from office #1 but I can't access a NAS administration page (port 5000) from office #1, it simply timeouts after a long time.

I hope I am clear enough in my explanation.

Can you guys help me please?
I'm desperate...

Thanks !

Anyone?

1.- Check Windows firewall config to open the new C ranges of the other offices. If you enable ping from the firewall UI it will allow only from the C class that the computer belongs to. Try disabling firewall and test.

2.- Could be similar: maybe the NAS only allows access to the /24 it belongs to...

3.- Make sure that you are routing traffic correctly and that traffic isnt coming through one interface/WAN and going out by the other. I've never got IPSec working with dual simultaneous WAN's, only could use them as failover or "loadbalancing" using difeerent policies