The information you are looking for should be in the Host Requirements RFC -I think this is also a debian package in doc.
For 10Mbits/sec Ethernet cable, this was the policy for a host few years ago and propably it is still in effect: 1. Must be able to send and receive packets using rfc 894(Ethernet) encapsulation. 2. Should be able to receive rfc1042(ieee 802) packets intermixed with rfc894 packets. 3. May be able to send packets using rfc1042 encapsulation. If the host can send both types of packets, the type of packet must be configurable and the configuration option must default to rfc894 packets. -- Ioannis Tambouras [EMAIL PROTECTED], West Palm Beach, Florida Signed pgp-key on key server.