Bug#296811: SSH hanging issues

[Vaclav Smilauer]

 I ran into this exact problem today with 1:3.4p1-1.woody.3.  It's
 undoubtedly a server-side MTU issue.  I was able to do

ssh [EMAIL PROTECTED] /sbin/ifconfig eth0 mtu 1000

 and after a brief pause, everything works again.

Adrian, is machine the server you are connecting to or is it the
router that does NAT?

If it is the machine where ssh server runs, can someone knowledgeable
explain if there is a way to achieve working config by tuning the NAT
machine only?

If it is the NAT machine (router, firewall), is eth0 the WAN interface
or the local LAN? 

BTW I am able to ssh with linux port of putty (without X11, though) and
scp with winscp over wine. How odd.

Good luck to everybody...
-- 
Vaclav Smilauer [EMAIL PROTECTED]



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Bug#296811: SSH hanging issues

[Adrian Irving-Beer]

I ran into this exact problem today with 1:3.4p1-1.woody.3.  It's
undoubtedly a server-side MTU issue.  I was able to do

ssh [EMAIL PROTECTED] /sbin/ifconfig eth0 mtu 1000

and after a brief pause, everything works again.

The pause is presumably because it sent me an oversized packet before
the command actually executed, but then the MTU took effect, and the
retransmission hit the new local MTU limit and was forced to fragment.

I do not know why these MTU issues only began affecting me today,
since I have SSHed to this machine several times before.  However, it
bears all the symptoms of an MTU issue, and I have experienced no
further trouble since I lowered the server's MTU.


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