Ethernet change from SUN OS 4.03 to 4.1?

[eaf at res-c4.prime.com]

I use IBM OS/2 Extended Edition and IBM TCP/IP 1.0 on a PS/2.  My ethernet
packets are accepted by MIPS, Apollo, Prime, and IBM. They are also
accepted by SUN OS 4.03.  They are not accepted by SUN OS 4.1.

I would appreciate any help that netters can provide.  One hint, my
packets are the extended IEEE form.  Is there a switch in SUN OS 4.1 that
will cause these extended packets to be recognized?

Please respond via E-Mail.
Thanks.

Edward A. Feustel
Prime Computer
500 Old Connecticut Path
Framingham, Ma. 01701-4548
efeustel at primerd.prime.com
(508)-879-2960x3846 until 10/6/90
(508)-620-2800x3846 after 10/6/90