Router to Router 'LAN to LAN Route' over the internet

Many years ago, pre-VPN's, I believe I remember seeing a Router to Router 'LAN to LAN Route' over the internet, allowing Subnet A, to access Subnet B (*Insecurely*), with each router sitting behind its own internet connection. Naturally since then, VPN's are easy to setup, however in my case, my two public addresses are actually still within my managed network, and as such wish to actually configure this using my Cisco 1700 Series routers, without having to purchase new equipment - I just can't remember how it was done.

For further explanation:
SUBNET A -> Cisco 1700 Router A -> INTERNET <- Cisco 1700 Router B <- SUBNET B

For the sake of networks, lets assume the following:

Subnet A: 192.168.1.0 / 255.255.255.0
Router A - Internal IP: 192.168.1.1
Router A - External IP: 202.111.111.111

Subnet B: 192.168.2.0 / 255.255.255.0
Router B - Internal IP: 192.168.2.1
Router B - External IP: 202.222.222.222

From Subnet A, we would like to fully access Subnet B, and vise-versa.

Anyone able to help? And if so, any suggested Cisco Router configs?

Cheers!
- Glenn
connectedguidamAsked:
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egyptcoCommented:
you need to configurate GRE tunnel between your A abd B router

http://supportwiki.cisco.com/ViewWiki/index.php/How_to_configure_a_GRE_tunnel
0
egyptcoCommented:
this config should work for you:

RouterA
interface Tunnel1
 ip address 10.1.1.1 255.255.255.252
 tunnel source FastEthernet0
 tunnel destination 202.222.222.222
 tunnel mode gre ip
!
interface FastEthernet0
 ip address 202.111.111.111
!
ip route 192.168.2.0  255.255.255.0 Tunnel0

RouterB
interface Tunnel1
 ip address 10.1.1.2 255.255.255.252
 tunnel source FastEthernet0
 tunnel destination 202.111.111.111
 tunnel mode gre ip
!
interface FastEthernet0
 ip address 202.222.222.222
!
ip route 192.168.1.0  255.255.255.0 Tunnel0
0

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connectedguidamAuthor Commented:
Perfect! Worked like a charm.

Thanks very much :)
0
connectedguidamAuthor Commented:
Thanks very much - top work & quick reply.
0
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