Help with BCP and multiple routers

Hi. I have problem routing between some of my routers. My setup is like this:

One central router on public ip. No physical connection to anything but the internet.

Several other routers spread out on various ends of internet connects to the Central one and opens transparent bcp bridge.

Technichians connect windows l2tp to central router and gets access to all the external routers and their networks.

The problem: I need 2 of the external routers to be transparent between them and share the same c-net, broadcast, multicast and so on.

Internal ip:s
Central router: 172.31.255.254
Ext. router 1: 172.17.1.254
ext. router 2: 172.17.2.254
Ext. router 3: 172.17.3.254 and so on.

When client connects to central router all neworks appear to work but no matter how i add routes I dont get 2 routers to be transparen.
Any suggestions on what technic to use? What protocols?

/HW

  1. Use Ethernet over IP instead of any other BCP protocol.

  2. I suggest you to not route multicast o broadcast over Internet, except, if you want, DHCP, SAMBA, NetBIOS, etc.

I do it because i need it. I have unintelligent rfid-bases that report their existense by multicast and I also need dhcp to be bridged so the main unit know who is who.

Why is Eoip better then BCP?

I´ll add a picture of the topology.
routerprobs.jpg

I solved it using pptp to the “Service” and Eoip to the “Demo” and “Central” but it dont like the speed. Its slow!

Almost like this forum when you have to wait 2 days for posts to get moderated… :frowning: