Leased Line configuration on Serial Port (Cisco 1841)

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 Below.

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

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 - DHCP DNS

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


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Master of Public Administratio
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setup a gre tunnel between A and B add static routes on both routers to reach the LAN subnets through the tunnel 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

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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 particulars.

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

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