Leased Line configuration on Serial Port (Cisco 1841)

Discussion in 'Cisco' started by Master of Public Administration, Mar 11, 2008.

  1. Hi all,

    Just wondering id some one is able to assit me with setting up 2 x
    Cisco 1841 To connect to a Leased Line connection. Details Listed

    Cisco 1841 Have Cisco IOS 12.1 - Also Have Serial Interface Cards

    Site A

    Remote Site with a 2mb Leased Line connection
    IP Range -
    Ideally Would Like Router on IP
    Need To connect to Site B for File / Exchange / DHCP

    Site B

    Main Site With 2mb Leased Line to Site A - Internet Connectivity
    Through Gateway
    IP Range -

    Looking for the best way to connect Site A to B with DHCP provided
    internet through

    Master of Public Administration, Mar 11, 2008
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  2. Master of Public Administration

    L J Guest

    setup a gre tunnel between A and B
    add static routes on both routers to reach the LAN subnets through the
    confugure ip helper on LAN interface of A
    configure DHCP pool on ROuter B for Router A's LAN subnet
    encrypt the tunnel after you get everything working
    L J, Mar 12, 2008
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  3. Master of Public Administration

    jseemann Guest

    I don't understand the reason for GRE tunnel LJ mentions, perhaps I'm
    not following what you want to do.

    When you say you have a 2Mb leased line and your routers have serial
    interfaces, I'm assuming that means there is some sort of multiplexer
    that telco is providing you to bond multiple T1s? Or maybe you just
    use E1? At any rate the serial interfaces below may need more
    configuration specific to clocking and framing - but you don't provide

    Its awfully tough to give you router config without understanding more
    of your SITEB setup, but in general ROUTERA is awfully simple to set
    up. It doesn't sound like you have a routing protocol running so
    we'll just use a static


    interface serial 0/0
    description LINK_TO_ROUTERB_2Mb
    ip address

    interface fastethernet 0/0
    ip address
    ip helper-address (sounds like is a MS DHCP
    server of some variety?)

    ip route


    interface serial 0/0
    description LINK_TO_ROUTERA_2Mb
    ip address

    interface fastethernet 0/0
    description This might not be how your network is laid out, so the
    default route below might not make sense if this particular router
    doesnt have an interface on 10.1.15.x
    ip address 10.1.15.x

    ip route
    jseemann, Mar 13, 2008
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