TCP checksumming must be explicitly enabled in NMMGR - I believe that
it's disabled by default.  The flag is located on the
NETXPORT.GPROT.TCP screen.  HP normally recommends that this be turned
off due to overhead considerations.
 
Lee Gunter
HMO Oregon      Internet:   [log in to unmask]
 
______________________________ Reply Separator _________________________________
Subject: HP NS3000 clients (zero tcp checksum)?
Author:  David D Kaas <[log in to unmask]> at ~INTERNET
Date:    11/22/95 8:02 AM
 
 
We have an HP3000 and are using the NS3000 communications programs.
I have set up a proxy program on a Sun running solaris 2.3.  The sun
seems to ignore connections requests from the NS3000 software.  In
running a sniffer on the network it seems that the NS3000 client,
nvt, has a zero tcp checksum field.  I have looked at tcp source
code, tcp_input, and if a packet has a bad checksum it is dropped.
Does the HP set an incorrect tcp checksum field? or am I missing
something.
 
Thanks for any help.
 
dave kaas
[log in to unmask]
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| Dave Kaas                         | Internet: [log in to unmask]               |
| Box 300 M/S A1-05                 |                                      |
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