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_wacolaco_
Level 1
Level 1

I have a situation in which I require to set-up IPSec tunnel in between two 1841 routers. This is normally two minutes job, in this case however one of the routers sits on a private LAN behind ADSL router (at the moment there is no reasonable way to get around it).

Thus:

1841-1 <-> WAN <-> ADSL Router  <-> 1841-2

1841-1

FE0/1 Private LAN 172.16.1.1

FE0/0 Public IP   

      |

WAN

      |

ADSL Router

Public IP

NAT

Private LAN1 192.168.0.1

      |

1841-2

FE0/0 LAN1 IP 192.168.0.1

FE0/1 LAN2 IP 172.16.0.1

172.16.1.0-172.16.0.0 require to communicate over the IPSec tunnel.

Could you please advice me on 1) what is the most practical way to set this up with out loosing sanity; and 2) Could you maybe point me to some documentation that deals with this specific scenario?

Thanks.

Comments
andrew.prince
Level 10
Level 10

Most ADSL routers support IPSEC Pass-Thru - so you just configure NAT-T on the routers, and allow the IPSEC VPN to be encapsulated in a UDP packet.

The ADSL modem should be configured for port forwarding for UDP 500 and 4500.

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