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

Monday, January 30th, 2006

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 [...]

Network Security – so https and ssh are immune to arp spoofing right?

Monday, January 30th, 2006

When a machine has been arp spoofed, ALL network traffic from it is likely passing through a “hostile” machine. So, NO, https and ssh traffic is not immune, it is travelling through a hostile machine. However, it should be encrypted. There are a few exceptions though. SSH version 1 is a broken encryption scheme and [...]

Network Security – Arp spoofing

Monday, January 30th, 2006

So…. what is arp spoofing (poisoning)…. and what are it’s implications? ARP spoofing involves tricking a machine into thinking that you’re machine is, yet another. Let’s put this in IP address terms. Let’s say that 192.168.0.1 is the default gatway on the network and 192.168.0.150 is our target. We are given another network address – [...]

Network Security – Hub or Switch?

Monday, January 30th, 2006

So, for those that have a little bit of knowledge about network hardware, you’ve probably heard this. “You can’t sniff switched networks”…. wrong…. let’s see what this is about. Older networking hardware was dominated by what’s called a hub. This was basically a “dumb” device that when it received data, it would retransmit the data [...]

Network security – how safe is your network? Looking at ARP

Monday, January 30th, 2006

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 look at something that makes [...]

Ping not working? try ARP

Monday, December 26th, 2005

I’ll confess to having a lot to learn about IP ethernet networking. I feel pretty comfortable with basic TCP/IP (v4), the concept of UDP vs. TCP ports, ICMP pings, etc… but ARP is something that I haven’t dabbled much with. It is, of course, a layer that TCP depends on. When a machine sends a [...]

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