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We have seen a strange thing recently. Suddenly all our bandwidth becomes busy. Even when I disconnect all users from our 3600 router (E1 Dialup lines) bandwidth remains busy (about whole 1MB/s) and comes to zero after a while (15 - 45 Minutes).
I have investigated our windows machines for Nimada and other visuses. Even when I disconnect windows machines this continues.
We are connected to the internet through a 2600 series Cisco router.
1- Is it possible to Put DOS attack on 2600 router itself?
2- We have a linux box with Squid (Red hat 7.2). Is it possible that some program in linux box does this .
3- How can I know (Generally) I am under DOS attack? (A. For Cisco routers, B. For Linux Boxes and C. Windows Machines )?
some observation that I did recently :
Even though I had disconnected all users there was about 100 connections (using netstat -a)
As soon as I killed squid processes bandwidth came to zero.
One thing that you can do it take a look at your logs on the internet router, i think you said its a 2600. See what traffic is coming in and out.
And YES, someone can DOS an internet router. Also call your ISP. You can work with them on figuring this out. THere are also sniffers you use to see whats actually coming in and out.
I hope this helps.