Security Basics mailing list archives
Re: weird
From: sunflower <sunflower () shadowfire org>
Date: Tue, 24 Feb 2004 18:27:18 -0600
If you are running any Mac OS 9.x or lower on your network, you can't enable spanning tree. Sounds like a loop to me aswell. andrea Aaron Keck wrote:
Are you running spanning-tree protocol? Consider the possibility of a switching loop, and a broadcast storm. They will give identical symptoms to the ones your describing if someone happens to inadvertantly create a loop.kenzo wrote:This weird thing happened at work. Everything was fine, then all of sudden the whole network freezes. All the swicthes and hub lights are blinking like there's no tomorow. So much traffic going on I can't even ping the computer accross me on the same switch. Then it stops and everything is back to normal. That happened twice.I use Ntop to watch for protocol usage to find infected computers(when that happens) and people using other protocols that the're not suppose to. Whenthis happens the box crashes. I tried using ethereal to see if I saw anything but of course it doesn't happen when I'm ready for it. I looked thru the traffic that I gathered from ethereal but none seem to really stick out.I'm not an expert, so the only thing that I know that will do the same thingis flooding the network with ramdom MAC addresses. Or maybe a major arp flooding or something.I haven't tried the arp flooding, but I know that the Mac flooding does thesame thing.What could it be? Did someone flood the network on purpose? If so, how do Itrack it?Or could it be that a bad Nic or device on the network just went crazy for a while. (That's what my boss seems to think.) Even then, how do I track it?Thanks.---------------------------------------------------------------------------Free trial: Astaro Security Linux -- firewall with Spam/Virus Protection Protect your network with the comprehensive security solution that integrates six applications for ease of use and lower TCO. Firewall - Virus protection - Spam protection - URL blocking - VPN - Wireless security. Download 30-day evaluation at: http://www.securityfocus.com/sponsor/Astaro_security-basics_040219------------------------------------------------------------------------------------------------------------------------------------------------------- Free trial: Astaro Security Linux -- firewall with Spam/Virus Protection Protect your network with the comprehensive security solution that integrates six applications for ease of use and lower TCO. Firewall - Virus protection - Spam protection - URL blocking - VPN - Wireless security. Download 30-day evaluation at: http://www.securityfocus.com/sponsor/Astaro_security-basics_040219----------------------------------------------------------------------------
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