BEAME@MCMASTER.BITNET (10/15/86)
HELP ! What is ethernet protocol 1001h and why is my Ultrix Vax using it to
send TELNET data?
During a regular TELNET TCP/IP session from my PC (Window size of 512)
to the VAX (Window size of 4096) I attempt to "cat" a large file, the Vax
starts sending packets of protocol type 1001h which seems to be of the form:
dest address source address type data
[ 6 bytes ] [ 6 bytes ] [1001h] [512 bytes data] [44 bytes ?]
My uVAX and PC are on the same local ethernet, no gateways.
- Carl Beame"Robert_S._Printis.osbunorth"@XEROX.COM.UUCP (10/16/86)
Looks like you have been bitten by the "illegal" Ethernet packet type that Berkelely used for the so-called "trailer" protocol. I believe that they confiscated the numbers that I assigned for "experimental" use and used them in a product. (At one time I assigned Ethernet host numbers) Anyone using the version on Unix that has the trailers feature will notice these packet types from time to time. Bob
nesheim@THINK.COM (Bill Nesheim) (10/17/86)
Note that REAL 4.3bsd unix will only use the trailer packet type if it is talking to another 4.3bsd machine: it now does trailer negotiation via ARP. In other words, your PC's won't ever see them. Bill Nesheim