A google search will bring up some useful references...
here's one <http://www.debianhelp.org/node/5452> that was slightly
> According to these files, the arp cache contains 300 entries after
the reboot, and over 2000 when your problems start. I'd recommend
increasing the values in proc/sys//net/ipv4/neigh/default/gc-thresh
even further; if that doesn't solve your problem try flushing the arp
table when the problem starts, and see if that fixes things without
It suggest you check your arpcache (see /proc/slabinfo) for entries...
other threads suggest that DOS/DDOS can cause these type of issues. Network
card choice can also be a factor (e.g. if you use a Realtek card).
2009/3/9 Gerard Hooton <g.hooton at ucc.ie>
> Hi all,
> I have just installed Debian 5 (Lenny)
> When i ssh from it I get:-
>>> ssh: connect to host xxxx port 22: No buffer space available
>> >From top I get
>> Mem: 515844k total, 506904k used, 8940k free, 11660k buffers
> Swap: 1510068k total, 108k used, 1509960k free, 375792k cached
>> I have
> Linux uepc004 2.6.24-1-686 #1 SMP Thu May 8 02:16:39 UTC 2008 i686
>> Also the imap server sometime gives this type of error
>> Any ideas?
> Gerard Hooton.
> Department of Microelectronic Engineering U.C.C.
> Butler Building,
> Enterprise Centre,
> North Mall.
>> Tel: +353 21 4904576
> Fax: +353 21 4904573
> Cork mailing list
>Cork at linux.ie>http://mail.linux.ie/mailman/listinfo/cork>
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