Internet Sharing across a Point to Point connection

Posted on 2009-12-23
Last Modified: 2013-12-14
Hello Experts, I am trying to connect a Point to Point circuit with 2 routers to an Internet T1 circuit on a Cisco 1841 router for Internet access.  The Cisco 1841 has an active circuit and provides Internet to the main office. The point to point connection's circuit is active and working.  There is a 1751 router in the main office and one in a remote office for the point to point.  These routers are currently configured so that they provide access to resources in the main office such as file servers. There are also 4 voice lines across this point to point that are operational but quality is poor.  

My real current issue is that I can't seem to get the correct route statement to allow access for the remote clients onto the Internet through the point to point connection.  This was accomplished previously using a Cisco 2800 with 2 CSU cards and worked well but the circuit provider has changed and a managed switch installed with only 1 CSU card.  The managed provider has not been of any assistance in troubleshooting or configuration of the routers.  Can anyone help me?  Please see the attached *cleaned* configs of the point to point routers.  I
don't have access to the managed 1841 router for Internet but the e0 port is .129. I'm not sure if I need to use the router on a stick methodology or what. I'm sure its something simple but I am missing it! Ultimately they need an MPLS circuit but that will probably have to come later.

Connection info:
1841 Internet router S0/0 public IP to T1 circuit
Fe0 connected to network switch IP

1751 Local P2P router S0/0 connected to P2P circuit IP
FE0 connected to same network switch as Interanet 1841 router, IP
Question by:mrichline
    LVL 2

    Accepted Solution

    Who is doing NAT for your office?  The 1841 router?  If so that router needs to be configured to NAT traffic from your remote location,, out to the internet.  They also need a route on the 1841 pointing that network to the P2P router, something like this:

    ip route

    I think this should do it for you as long as there aren't any ACL's or Firewalls in the way.

    Author Comment

    Yes, the 1841 router is doing NAT, I'll have the managed services provider add that statement.  Thanks!  I'll let you know if it resolves the issue.

    Author Closing Comment

    That did the trick!

    Featured Post

    Looking for New Ways to Advertise?

    Engage with tech pros in our community with native advertising, as a Vendor Expert, and more.

    Join & Write a Comment

    We've been using the Cisco/Linksys RV042 for years as: - an internet Gateway - a site-to-site VPN device - a leased line site-to-site subnet-to-subnet interface (And, here I'm assuming that any RV0xx behaves the same way as an RV042.  So that's …
    Skype is a P2P (Peer to Peer) instant messaging and VOIP (Voice over IP) service – as well as a whole lot more.
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

    733 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    22 Experts available now in Live!

    Get 1:1 Help Now