[CLUG] No buffer space available

[Donal Hunt]

A google search will bring up some useful references...
here's one <http://www.debianhelp.org/node/5452> that was slightly
insightful:

> 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

rebooting.


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).

Regards

Donal

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
> GNU/Linux
>
> Also the imap server sometime gives this type of error
>
> Any ideas?
>
> Thanks
> --
> Gerard Hooton.
> Department of Microelectronic Engineering U.C.C.
> Butler Building,
> Enterprise Centre,
> North Mall.
> Cork.
>
> Tel: +353 21 4904576
> Fax: +353 21 4904573
> http://www.ue.ucc.ie/
>
>
>
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