Wednesday, 15 May 2013

What to do if subjected to a Denial of Service attack.

A couple of weeks ago, I lost internet access for about 30 mins due to a Denial of Service (DoS) attack.
I feel honoured that I've annoyed someone on the internet so much that they spent time and effort DoS attacking me!

Brute-force attacks from individuals are difficult, as my downlink speed is much faster than most people's uplink speed. To mount an effective brute-force attack requires multiple computers infected with a trojan. This is known as a Distributed Denial of Service (DDoS) attack and requires a lot of computer knowledge.

A much simpler approach is the SYN flood attack. I believe that I was subjected to one of these, as on rebooting, I temporarily had internet access but lost it after a few seconds when all of the available connections on my pooter became "half-open".

To defeat such an attack is simple. All that you have to do is harden the TCP/IP stack. See also http://msdn.microsoft.com/en-us/library/aa302363.aspx and http://www.pctools.com/guides/registry/detail/1237.

11 comments:

Praguestepchild said...

So your home computer was subjected to a DoS?

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Nigel Kinbrum said...

Yes. I tried the usual remedies of turning everything off, then on again. It worked for a short time, then pages wouldn't load on both Firefox and IE. I called customer services and moaned about the interruption to my service. They told me that there were no outages in my area, but there did appear to be a problem, as my modem wasn't responding to their tests. They arranged to send an engineer the next day to examine my hardware, but I cancelled the visit when I sussed what was happening.

I set my PC security software to monitor network traffic and I could see a high rate of incoming data (~150kbps) even though I wasn't doing anything. At some point, the attack stopped and everything worked again.

Praguestepchild said...

Are you riding the internet bareback? You ought to have a router to do IP masquerading (and other things) to add a layer of security. Even a cheap router adds a decent layer of security and is better than some crap like Norton on your PC. An old computer can be turned into a Linux router which is pretty secure, and can be quite decently secure.

Nigel Kinbrum said...

Dunno about "bareback" My Firewall runs in full stealth mode and passes every port probe test on grc.com. It also blocks and queries outgoing connections from untrusted apps. Someone got hold of my IP address from somewhere, but I haven't had any problems since then. My stack is now well-hard!

Praguestepchild said...

Also, to DoS you someone would obviously need your IP address, how would they get that unless you commented on their blog (where IPs were tracked) or someone gave it to them?

Praguestepchild said...

Bareback, having sex without a condom. If you are connected directly to the internet without a router and a router assigned sub-address you are barebacking. Better to have the firewall and such on a dedicated machine that's not windows based, ie a cheap ass or not so cheap ass router.

Nigel Kinbrum said...

I have a wireless modem with a built-in router.

Nigel Kinbrum said...

I dunno how someone got hold of it.

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