Alan Cox wrote:
>
> > offices connected via two 3Com Netbuilder RemoteOffice Router
> > over a 64K ISDN leased line. There are several unix machines
> > in the second network, e.g. a DG Aviion running DG/UX, which
> > can be accessed fine from the first network all the time.
>
> Try turning off tcp_sack on the Linux boxes. I dont know of specific
> bugs in the netbuilers, but that seems the best first guess
>
> Alan
Hello Alan,
i�ve turned off tcp_sack in /proc/sys/net/ipv4/tcp_sack. Nothing
changed. I investigated the problem further with strace on a example
telnet session. Here is the status of telnet client and server that i
found when the connection hangs:
SERVER: strace shows that it hangs on "select(1, [0], [0], [0], NULL"
netstat -t shows that in this special example there are
about 39k in the sendqueue, receivequeue is empty.
CLIENT: strace shows that it hangs on "select (4, [0 3], [], [3], NULL"
netstat -t shows that recvqueue is empty.
Any idea how to go further in debugging the problem?
--
Helmut Wirth
[EMAIL PROTECTED]
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