Network Security – how should an open wireless access point be run beside a safe network?

So, let’s say we want to have an open wireless access point for some reason. (Maybe offering it to guests if you’re a business?) There are certainly a lot of BAD ways to give open wireless access. As we’ve seen in this series so far, it could be quite easy to hijack all connections in a network using arp spoofing. If you run business machines on a network you do NOT by any means want an open access point on the same subnet. Here are some possibilities though…..

Let’s say we’ve got a dsl modem/router that gives out addresses in the 192.168.1 range of addresses. Further, let’s say we’ve got a firewall/router setup providing a “safe network with a 192.168.0. range of addresses. So, what are our options?

Access point plugged into 192.168.0. range…. bad idea, the clients could hijack network traffic using arp poisoning.

Wireless router plugged into 192.168.0. range (with clients in the 192.168.2 range) Interesting thought. ARP poisoning would not be possible, but it would be possible for 192.168.2 clients to scan and access tcp services in the 192.168.0. range (which is upstream.) the router would basically prevent tcp access INTO the wireless address subnet, but would not prevent “browsers” working their way out.

So, we could plug and access point into the main dsl/router and give wireless clients a 192.168.1…. address? The only problem with this is that traffic from the firewall to the dsl router could be hijacked using arp spoofing by any of the wireless clients.

So, here the best option seems to be this…. wireless ROUTER plugged into 192.168.1 dsl/router which means the wireless clients can be assigned addresses within their subnet (192.168.2 for instance.) So, the best setup for a side by side safe and “wide open” network seems to be a “Y” configuration…

Safe Net and Unsafe Net are peers with different “internal” subnets. (So they’re each behind a router/firewall)

And the router to the world is upstream for both the safe and the unsafe routers.

Related Posts

Blog Traffic Exchange Related Posts
  • Network security - how safe is your network? Looking at ARP A while back I did a network security series and one of the points that I mentioned was that it's important to know what is normal for your network. In other words, what machines are NORMALLY connected, what services are normally running, etc. Well, I'm about to start a serious......
  • Network Security guide for the home or small business network - Part 9 - Know your network Once more into the breech... Ok you've taken account of the software and services on your pc. The next thing we need to talk about is knowing your network. Do you have any wireless access points? Not sure? Print servers? How many pcs? Are any of them portables? Public access?......
  • Network Security - Arp spoofing series I think I've wrapped up the series on arp spoofing and it's implications for network security. I know there's nothing earth shattering here, most network security types are well aware of the problems (and perhaps aware of more sophisticated solutions?). For some though, this series is likely an eye opener......
Blog Traffic Exchange Related Websites
  • River's Edge Golf Course, Bend, OR River's Edge Golf Course is located in: Bend, OR Phone: 541-389-2828 Website: Course History: This is a terrific course located on the Riverhouse Resort that is open to the public and offers some very great rates. It was designed by the famous Robert Muir Graves and offers a championship......
  • What is a birthright? What is a birthright: A birthright is the wealth preserved for a son. Typically the birthright is reserved for the oldest son. However, there are exceptions within Scripture. Which son deserve the birthright is ultimately a decision reserved for the father and/or the oldest son. Biblical Passages Regarding Birthrights: Jacob......
  • Intego VirusBarrier X6 Mac Antivirus Tools Intego VirusBarrier is hands-down the top Mac antivirus software you can buy. Combining rock-solid protection, comprehensive features and a firewall everything in one usable interface, Intego VirusBarrier X6 sets the conventional of excellence on the subject of Mac security. Put simply, we didn’t find the same a higher level protection......
PDF24    Send article as PDF   

Similar Posts

See what happened this day in history from either BBC Wikipedia
Amazon Logo

Comments are closed.

Switch to our mobile site