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SubjectWas: NCSA telnet doesn't work any more. IS: Socket destroy delayed.


On Wed, 27 Mar 1996, Alan Cox wrote:

> > I have already posted this in linux-net, but got no single response. Now
> > I have some more data, so I'm posting this once more.
>
> Ok the reason I ignored it is I bin most reports based on certain stacks because
> they are known problem stacks anyway. Notably trumpet v1 and NCSA
>
> > I have found that linux 1.3.74 and 1.3.77 does not work with NCSA telnet for
> > DOS (or rather NCSA telnet doesn't with linux). From NCSA side it looks like
> > the conection is open, but nothing (even login's output) arrives. From the
> > linux side in.telnetd is launched, but nothing more.
>
> Someone said something about NCSA having been fixed. I don't know more about
> it - maybe ask the NCSA people. Also send them this trace too. If they need
> a contact to work out why the two dont talk point them at me.
>
> > 18:08:12.000000 kakofonix.posnet.com.telnet > 1.2.3.88.11134: . ack 16 win 13125 (ttl 64, id 1700)
> > 18:08:12.000000 1.2.3.88.11134 > kakofonix.posnet.com.telnet: . ack 1 win 1024 (ttl 100, id 5)
>
> Up to here looks ok. Note now that we keep sending the remote machine data
> and it is ignoring us after this. That is broken because unless its turned off
> it should either be
>
> a) Sending us an ICMP protocol error if it thinks we are talking garbage
> b) Sending a TCP reject if its lost the connection
> c) Sending a TCP ack frame for at least every other tcp frame regardless of
> whether sequence spaces are right or wrong
>
> > If you have any ideas or need additional information or testing, feel free
> > to write me even at 8 in the morning :-)
>
> Can you try leaving pc/tcp compatibility off and disabling MTU discovery ?
>
> Alan


I have just checked it. It helps. But after changing this ONE option I've
got many 'Socket destroy delayed' messages.



Mar 27 13:48:00 kakofonix kernel: ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Mar 27 13:48:00 kakofonix kernel: Floppy drive(s): fd0 is 1.44M, fd1 is 1.2M
Mar 27 13:48:00 kakofonix kernel: Started kswapd v 1.4.2.2
Mar 27 13:48:00 kakofonix kernel: FDC 0 is a 8272A
Mar 27 13:48:00 kakofonix kernel: ne.c:v1.10 9/23/94 Donald Becker
(becker@cesdis.gsfc.nasa.gov)
Mar 27 13:48:00 kakofonix kernel: NE*000 ethercard probe at 0x300: 00 80
48 9f 13 f2
Mar 27 13:48:00 kakofonix kernel: eth0: NE2000 found at 0x300, using IRQ 11.
Mar 27 13:48:00 kakofonix kernel: Partition check:
Mar 27 13:48:00 kakofonix kernel: hda: hda1 hda3 hda4
Mar 27 13:48:00 kakofonix kernel: VFS: Mounted root (ext2 filesystem)
readonly.
Mar 27 13:48:00 kakofonix kernel: Adding Swap: 12468k swap-space
Mar 27 13:48:00 kakofonix kernel: double lock on device queue!
Mar 27 13:48:00 kakofonix kernel: Socket destroy delayed (r=0 w=236)
Mar 27 13:48:40 kakofonix last message repeated 4 times
Mar 27 13:49:50 kakofonix last message repeated 7 times
Mar 27 13:50:50 kakofonix last message repeated 6 times
Mar 27 13:51:00 kakofonix kernel: Socket destroy delayed (r=0 w=236)
Mar 27 13:51:04 kakofonix syslogd: exiting on signal 15



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