Sounds like it may be ipchains or iptables. (probably ipchains)
service ipchains stop; service iptables stop; chkconfig iptables off ;
chkconfig ipchains off
> Having given up trying the MS route, could anyone help me with this
>> I have the simplest of networks - 1 XP laptop, and 1 Redhat 7.1 PC with
> either a cross-over cable or **dumb** hub between.
> - Addressing, etc. is correct
> - Network cables, etc all checked
>> The problem:
> tcpdump on Redhat sees traffic from both machines, but the Redhat machine
> never responds to requests from the XP machine.
> The XP machine responds to requests from the Redhat machine - tcpdumps
> it, but ping, telnet, etc ignore it.
>> The only oddity I can see is that the packets from XP all claim they are
> 801.1Q VLAN#0. There is no reference to VLAN's anywhere I've found on MS.
>> I'd love to get rid of MS altogether but unfortunately its a prototype for
> commercial project where MS clients are unavoidable.
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