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




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