Denial of Service (DoS) attacks!!

Status
This thread has been Locked and is not open to further replies. The original thread starter may use the Report button to request it be reopened but anyone else with a similar issue should start a New Thread. Watch our Welcome Guide to learn how to use this site.

starwolf39

Thread Starter
Joined
Jan 26, 2001
Messages
276
I know someone who is threatening to use DoS attacks on me. I have a firewall, but I don't think that it can protect me if he tries to mass ping me. Is there some sort of program that I can download to prevent these types of attacks, as well as some others hopefully??
 
Joined
Dec 2, 1998
Messages
2,736
I don't think there's any program that can 'prevent' a DOS attack since (as far as I understand), it just creates an enormous amount of traffic - so even if you had everything blocked, there are still the attempts.
If you know who is threatening you, report it to your ISP immediately, they should be able to do something on their end to prevent it getting to you.
 

starwolf39

Thread Starter
Joined
Jan 26, 2001
Messages
276
i used the IP agent program and used the 'test my shields' button to test my computer's security for weaknesses. it found that all my ports were running in stealth mode, and it said that it could not even find port 139!! so is that going to completely eliminate DoS attacks, reduce them, or what?
 

eddie5659

Moderator
Malware Specialist
Joined
Mar 19, 2001
Messages
37,484
I take it you're using a firewall.

Yes, but only to some degree. If they really want you, there you go. Closing the port just protects you more.

Which firewall are you using? Are you on a network or is it just standalone?

The reason why the network, is that they are more than likely to get attacked. Have a read of this:

http://www.sans.org/dosstep/index.htm

Regards

eddie
 

starwolf39

Thread Starter
Joined
Jan 26, 2001
Messages
276
i am on a network, and am running norton firewall, if that helps at all.
 

eddie5659

Moderator
Malware Specialist
Joined
Mar 19, 2001
Messages
37,484
Hiya

I posted that link just to give you a picture on what you may need to do. This one

http://www.petertodd.ca/articles/dos_attacks.html

is pretty good.

This is a bit about securing:

Disable ICMP replies. If someone tries to connect to a port that has nothing behind it why send back a ICMP message saying there is nothing there and double the bandwidth being used up?
If needed disable pings. While probably not something you will want to do very often, I for one am very anoyed when a site doesn't respond to my pings, it can help while you are being attacked.

If the attacker is using up your bandwidth, for instance someone sending zillions of junk packets to random ports, you will have to get your ISP to do the blocking.
If the attacker is trying to use up your computer power, for instance someone doing repetitive junk querys on a web-accesible database, you can do the blocking yourself.
Limiting is a good alternative to outright blocks. Just don't allow more then x whatever per client. This can also apply to bandwidth attacks.
Unless the remote computer has actually connected to a service the return IP address may be fake. For instance UDP junk can have a fake return address while someone doing database querys will always have a real address. This also means that tracking down the person may well be impossible. The FBI has only narrowed the Yahoo! attack down to California and Oregon, and it has been poring over logs for a few days
Also, look at www.grc.com as they have some good articles.

Regards

eddie
 
Status
This thread has been Locked and is not open to further replies. The original thread starter may use the Report button to request it be reopened but anyone else with a similar issue should start a New Thread. Watch our Welcome Guide to learn how to use this site.

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

As Seen On
As Seen On...

Welcome to Tech Support Guy!

Are you looking for the solution to your computer problem? Join our site today to ask your question. This site is completely free -- paid for by advertisers and donations.

If you're not already familiar with forums, watch our Welcome Guide to get started.

Join over 807,865 other people just like you!

Latest posts

Staff online

Members online

Top