Re: THICKER TCPIP SOUP

A few more things to try:

1) can you run the loopback (one-computer) test on both of the two machines
being used for the two-computer test?

2) is it possible to take two computers off the network and connect them
directly to each other with a cheap hub or 10-base-t 'null-modem' cable?
This would take all the routers, firewalls and other network issues out of
the test.

3) can you run an off-the-shelf ftp server on one machine and a client on
the other? Switch roles?

> -----Original Message-----
> From: Gene LeFave [SMTP:gene_at_tekdata.com]
> Sent: Friday, May 10, 2002 11:01 AM
> To: sftalk_at_forth.com
> Subject: [sftalk] Re: THICKER TCPIP SOUP
>
>
> Suggestions:
>
> Be sure that the recv on the client handels the WSAEWOULDBLOCK
> status differently then other errors.
>
> Verify that the two machines are actually in the expected states, that the
>
> client issued the recv, and the server issued the send.
>
> Double check the network masks, you should be able to ping both ways.
>
> Verify that you are not expecting the packet boundaries to remain intact
> over a network. For example, a client might send two 10 byte packets,
> but the server might receive a single 20 byte packet. The converse can
> also happen, the client can send a 20 byte packet, but the server could
> receive this as two packets. A good thing to look for is if the client or
>
> server has two sends or recvs in a row. This is a flag for a common
> programming error.
>
> Gene
>
>
>
> On 10 May 2002 at 10:51, Dr. Roger Dube wrote:
>
> >
> > Let me just thicken the TCPIP soup a bit, following my previous
> posting...
> >
> > hostname = localhost on client
> > Client and Server on same machine
> > All two-way communication works fine.
> >
> > hostname = IP address on client,
> > Client and Server are still on the SAME machine
> > All two-way communication works fine
> >
> > hostname = IP address on client
> > Client on second machine on the LAN
> > Server still at first machine with IP address used to set
> hostname
> > on Client
> > Connection is made, conversation stops when Server tries to
> send a
> > response back to Client.
> >
> >
> > ????
> >
> > I'm only changing the physical machine on which Client is operating...
> > seems to me. Sorry, that's the experimental physicist in me trying to
> use
> > experiments to locate the problem.
> >
> > Again, any ideas would be most welcome.
> >
> >
> >
> >
> > ----------------------------------------------------------------------
> > Dr. Roger Dube
> > rdube_at_gate-tech.com
> > President
> > Gate Technologies International, Inc.
> > http://www.gate-tech.com
> > Executive Offices:
> > 3700 Airport Road Suite 307
> > TEL +1.561.392.7404
> > Boca Raton, FL 33431-6409
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Received on Fri May 10 2002 - 11:32:54 PDT