Check the duplex setting for your FastEthernet Port on the Router and that on your Switch/Hub. Sounds like you might have a duplexing issue.. Spencer ************************************************************ Spencer Wood, Network Manager Ohio Department Of Transportation 1320 Arthur E. Adams Drive Columbus, Ohio 43221 E-Mail: Spencer.Wood@dot.state.oh.us Phone: 614.644.5422/Fax: 614.887.4021/Pager: 866.591.9954 ************************************************************* Drew Weaver <drew.weaver@thenap.com> Sent by: owner-nanog@merit.edu 01/07/2003 02:19 PM To: "'nanog@merit.edu'" <nanog@merit.edu> cc: Subject: Weird networking issue. Hi, this is kind of a newbie question but this doesn't make a whole lot of sense :P I have an etherstack hub connected to a FastEthernet port on a cisco 3660 router, these are the stats when I do a show int fast0/0: 5776 input errors, 5776 CRC, 2717 frame, 0 overrun, 0 ignored Whats weird is I just cleared the counters 12 minutes ago, and already there are almost 6000 CRC errors. This connected via a standard Cat5 ethernet cable, I have tried replacing the cable to noavail. Is this a fairly normal situation, If so that's great, but it seemed rather ridiculous to me, and if it is not a normal situation, what would cause this? Any ideas are appreciated. Thanks, -Drew Weaver