Date: Thu, 26 Feb 1998 11:11:54 -0600 (CST) From: Wm Brian McCane <root@bmccane.maxbaud.net> To: isp@FreeBSD.ORG Subject: DoS attacks Message-ID: <Pine.BSF.3.91.980226110250.5125A-100000@bmccane.maxbaud.net>
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I am having a peculiar problem with my router, and have begun to believe that it is the result of some form of DoS attack. At seemingly random intervals (usually late at night), my router would stop talking to my upstream feed. In order to fix the problem , I would have to tell it to hangup it's ISDN connection, at which point it would dial back in and everything would work for a couple of days. To help fix the problem, I wrote a small shell script which connected to my router and did the hangup automatically. This was run once a night and the problem seemed to go away (I picked a time a few minutes after the latest time I had gotten the problem). After this script was implemented, I started to receive the lockups during the day occassionally. So, being the industrious person I am, I modified the perl script to run all the time, and monitor the ping statistics inside my router (It's a truly ugly state machine by the way). Anyway, I am now at the point where I can recover within about 30 seconds of a lockup, I could be faster but I don't want to tie up my line with pings. To make a long story shorter, I am now receiving these lockups at a rate of about 1.5 in every 10 minute interval. Connections to down-stream sites from me are not suffering this problem, only my connection to the Internet, so I don't think it is the router. I have checked Ascend, and I have the latest firmware for the unit. Any suggestions? brian BTW> This is a Max200Plus router (kinda like a red-headed step-child out at Ascend, but it worked great for several months before this started). +-----------------------------------+------------------------------------------+ He rides a cycle of mighty days, and \ Wm Brian and Lori McCane represents the last great schizm among\ McCane Consulting the gods. Evil though he obviously is, \ root@bmccane.cavtech.com he is a mighty figure, this father of \ http://bmccane.cavtech.com/ my spirit, and I respect him as the sons \ http://bmccane.cavtech.com/~pictures/ of old did the fathers of their bodies. \ http://bmccane.cavtech.com/~bmccane/ Roger Zelazny - "Lord of Light" \ +-------------------------------------------+----------------------------------+ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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