Ethereal - free, and decent. Shomiti Surveyor - expensive, requires special hardware for line rate (and excess) traffic generation, and difficult as could be to use. But very powerful. Basically, it depends on what you want to do with it. If you want to analyze what's going on on the LAN, I see nothing wrong with Ethereal/tcpdump/<insert free package here>. But for actual testing, you need Surveyor or something similar. Just my $0.02 Jon -----Original Message----- From: Dr. Mosh [mailto:nanog@zeromemory.com] Sent: Monday, August 19, 2002 5:29 PM To: nanog@merit.edu Subject: Sniffers/Analysers Anyone have recommendations for LAN analysers? (besides building a box and using tcpdump) Personal experiences, recommendations, etc...? Private reply works. Thanks -- -------------- http://www.zeromemory.com - metal for your ears.