Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

2 Routers, 1 LAN

2 Routers, 1 LAN

2 Routers, 1 LAN

Hello, in need of some help if possible. I currently have two routers on one network operating as follows:

Router 1: Staff Use
DHCP from

Router 2: Training Use
Static only from

Both routers and equipment are all on the same LAN but I would like to have the Training Network accessible from the Staff network but not the staff network from the training network.

If anyone can help me with this i would be most greatful, can this be done using Subnetting?


RE: 2 Routers, 1 LAN

A router is used to bridge network domains.  A device on a network will use the destination IP, its own IP, and the subnet mask to determine if the destination is on the same network segment or not.  If the destination is on the same segment, the packet is sent to the destination, otherwise it is sent to the best matching router or default gateway.

Consequently, all devices on your 172.16.x.x/16 network will consider themselves on the same segment and won't go through the routers.

Off hand it sounds like what you need is a switch with ACL (access control list) functionality.  Your router's switch portion may have this capability (you will need to investigate).  This would allow you to create a set of ports that is only accessible via a subset of the range.  In other words, it is still one network segment (not subnetted), but traffic will only flow from one switch bank to the other if it is coming from approved side of the fence.


RE: 2 Routers, 1 LAN

Thanks for the reply, networking really isn't my strong point!!

If the Staff and Training network were on a different class of network would that cause problems e.g.


How would I get the staff network to talk to the Training network?


RE: 2 Routers, 1 LAN

I think this approach would work.  Both of these ranges are private so as long as there is no defined routing path, attempts to access an off limits domain would go nowhere.

In order to get the staff side to be able to access the training side, I think you would need a router with two interfaces for the staff.  One interface (say eth0) would connect to the 192.168.0.x network and the other (eth1) would go to your default (internet) connection like it does now.  You would then tell the staff's router that traffic for the 192.168.0.x range routes via eth0 and make eth1 the default gateway.  

This could even be achieved with a PC being used as a router instead of a dedicated device.  There may be some other, i.e. better, ways to do this too but this isn't my strong point either.  For example, a good router may have multiple ports on it and you can specify some of them being on one range and some on another, I am really not sure what the state of the hardware is today.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close