no network between cyrix 6x86 and intel pentium 4

[kamal kc]

i problem i state here is not particularly about freebsd but it's still related to network
and has recently made me very much confused.

the problem is when i try to put two computers with cyrix 6x86 and intel pentium 4
in the same network there is no communication between the computers.

-----
what i did till now:::::
-- i connected the two computers by cross wire cable. there is no communication.
-- i connected the two computers by a 10 Mbps network hub, still there is no
 communication
-- the network card i have used is Realtek 8139 (10/100 Mbps) in both the computers
-- i monitored the transmitted packets by using ::tcpdump:: and ::ethereal:: and 
  what i found was::::: the cyrix 6x86 computer transmits the packets but cannot 
  receive packets sent to it.
-- the cyrix 6x86 has processor speed of about 133 Mhz and intel pentium 4 of 1.8 Ghz
-- the cyrix 6x86 can communicate with pentium computers. i tried it in a different 
   network
-- the pentium 4 can communicate with other pentium 4 computers. i also tried it in a 
   differeent network.

-------------------

that's all i had done till now.

is there any possibility that the processor speed can affect the network??
or 
is there any other reason that i may have overlooked ??

i am really confused and don't know what to do
as i need the network as soon as possible.
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