Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

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

The machine has two NIC's, each connecting to a separate network.

  • Network A is Internet facing and requires a proxy to do so
  • Network B is an Intranet

The problem is, if I set the proxy settings, I cannot access sites on Network B. If I don't set them, I cannot access the Internet (on Network A). Is there a way to set this up so I don't have to keep flipping this setting on and off?

The specific browser I'm using is Firefox, but I'm asking in more of a general sense. Is this something I could configure on the NIC itself?

share|improve this question

migrated from Jun 14 '11 at 14:09

This question came from our site for system and network administrators.

Please read our FAQ next time. – Chopper3 Jun 14 '11 at 14:09
up vote 1 down vote accepted

You can't do it per NIC, but you should be able to do it per address range. Look under Options, Advanced, Network, Connection, Settings, No proxy for.

share|improve this answer
I don't know how I've never seen that before, it was right in front of me! I guess I just wasn't entirely sure what I was looking for. Thanks! – Gary Jun 14 '11 at 14:22
I do have one follow up question. This option allows me to enter a domain name or IP range. I don't suppose there's a way to do so for NetBIOS names (within that IP range) other than manually putting in each server, is there? – Gary Jun 14 '11 at 14:27

Most browsers have a proxy exclude list.

Add your intranet to the exclude list and use the proxy for everything else.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.