Adding a new LAN segment

Unanswered Question
Feb 5th, 2007


Currently I only have 1 Cisco 2600 router, which connects serially to a leased line device, with an Ethernet port that connects to my LAN.

Currently, I would like to add a new LAN segment (different network) to my LAN.

My idea is to get a new Cisco router that has 1 serial interface (connects to the old 2600 router ) and 2 Ethernet interfaces (connects to the old LAN segment and the new LAN segment respectively). However, my old router does not have anymore serial port.

What can I do to solve this? Any input is welcomed

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
spremkumar Mon, 02/05/2007 - 22:20


whats the idea behind bringing in one more new segment ?

with the current setup itself you can create subinterfaces on the main physical fastethernet and have two segements configured on it .


Silver_Sys Mon, 02/05/2007 - 23:29

Hi spremkumar,

The current Cisco 2600 router, which connects to my ISP (leased-line device) serially only have 1 Ethernet port(which connects my LAN).

My plan is to get a new network and then connect the old network with the new one.

spremkumar Mon, 02/05/2007 - 23:32


Can you specify your exact router model here ?

if possible do post out show version output so that the compatibility for installation of new modules can be found..


Jitez1234 Tue, 02/06/2007 - 04:26

You may not need another Router if all you really need is to add another network segment or subnet.

2 options

1.configure secondary addressing on your fastethernet interface

2.create logical loopback interface on your fastethernet interface.

I will go for option number2

hope this helps


sindhuraj Wed, 02/07/2007 - 23:01


I am Rajesh Sindhu.

If your LAN is logically in multiple segments then to solve your situation we can have two sub interfaces on eth port of router. then we have to add both ports in static routes also.

this way we can route traffic in between both LAN segments as well as towards WAN also.

If your second LAN is also on different physical segment then we have to uplink that aggregation nearest to point of interconnection in between router and LAN say on directly connected switch on router.

Please update if i am not correct.

[email protected]

Thanks & Regards

ahmednaas Sun, 02/11/2007 - 00:01

What type of switch do you have now?

Does it support VLAN's?

Do you have extra ports on the switch?

Also, if the NM slot in your 2610XM is empty, you should consider the NM-ESW16 switch module.


This Discussion