Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Have two LANs with separate routers with internet connections which are not connected together and have setup a wireless printer on one network.

I want to share the printer on the other network and block the internet flowing to the other.

Is it possible to do so?

share|improve this question

I assume you're using home routers with NAT, which is the most common case. This means that to outside world, all computers in the LAN (including printer) share IP address of the router.

I'll call the network without the printer A an the other one B.

If the two networks really are not connected by other means, in order to expose the router from one to other, you'll need to expose it to the Internet. In TCP/IP context, that means one more opened port (what your printing protocol is using) on one public IP address (that of router B). Obviously this is a potential security risk, so the least you'll need to do is to set up firewall on router B to limit access to this port to certain single IP address: that of router A.

Regarding the exposing, you can either set up port forwarding in the NAT so that users from network A will connect to the printer directly using the router B's public IP address, or, if your it has that option, set up router B as a printing server, which could help with additional security.

This is probably the simplest solution. Other, probably more secure solutions include using SSH tunnel (insttead of port forwarding) or a VPN to connect the whole networks tohether.

Note that "block the internet flowing" is a different question, which IIUC can be achieved by setting up firewall on router A to talk only to router B.

share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .