Henry Nestler wrote:
> Hello Brendan,
> Brendan Simon wrote:
> > Another possibility is that XP is doing TCP checksum offloading (ie.
> > letting the adaptor generate the TCP header checksums). I don't think
> > TAP does this, therefore TCP packets will be invalid. PING uses ICMP,
> > not TCP, so this does not affect PING. I had this problem where I
> > ping XP<->coLinux but I could not telnet, ssh, http, etc. DNS will
> > probably fall in the same category. If this is what you think is
> > happening to you then see the "Networking::Trouble Shooting::TCP/IP
> > Checksums" portion of the Wiki.
> That's a very nice idea.
> I have some other trobble with standard echo request on port 7/UDP.
> Win2000 echo service does not echo my UDP pakets from coLinux
> pcap-Bridged. If I use my self programmed echo server on port 7, it's
> Do you know, how should colinux network device build this checksum?
Just to clarify, the Win2K echo service does not work, but your echo
service (running on Win2K) does work, right???
If so, then it must be a bug in the Win2k echo service?
Have you tried other UDP applications (eg. tftp).
Have you tried disabling tcp checksum offloading? You need to reboot!!!
I assume the TCP stack makes the decision about checksum offloading, not
the applications using TCP/UDP.