Thanks guys. Steve
""Priscilla Oppenheimer"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > At 02:48 PM 12/11/01, you wrote: > >what does an ethernet keepalive packet look like? Who does a router send > >one to (especially if connected to a switch). Is it looking for voltage or > >something else? > > It's not looking for voltage. It's just checking to see that it can send > its own frame. The frame format is actually a loopback frame (EtherType > 0x9000) from the "Ethernet Configuration Testing Protocol" section of the > Ethernet II standard, which was never widely adopted (except by Cisco). > Here's a capture of a keepalive frame: > > Flags: 0x00 > Status: 0x00 > Packet Length:64 > Timestamp: 14:42:20.319000 04/26/2001 > Ethernet Header > Destination: 00:00:0C:05:3E:80 > Source: 00:00:0C:05:3E:80 > Protocol Type:0x9000 > Packet Data: 46 bytes (all zeros) > > Note that this is quite different from a serial keepalive which has > sequence numbers and ACKs. > > Priscilla > > ________________________ > > Priscilla Oppenheimer > http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=28948&t=28888 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
