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* Problem : Linux - SOlaris NFS
@ 2002-09-17  7:38 ashutosh.varshney
  2002-09-19 17:23 ` Tom McNeal
  0 siblings, 1 reply; 5+ messages in thread
From: ashutosh.varshney @ 2002-09-17  7:38 UTC (permalink / raw)
  To: nfs

Hi

We had a lot of SUN machines and just installed few linux machines.We
have all our licenses/Softwares of Solaris m/cs( NIS also on Solaris).But
when we access the things from linux client..network chokes..all things
hang..then we reboot the linux ..and set the rsize & wsize to 8K and now
things work fine..
Can any one puts lights why this all happen ..where is the problem.. in
linux or solairs.
Any site referneces for this customization..

thanks in advance

Ashutosh



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^ permalink raw reply	[flat|nested] 5+ messages in thread
* RE: Problem : Linux - SOlaris NFS
@ 2002-09-19 20:00 Lever, Charles
  2002-09-20  3:39 ` ashutosh.varshney
  0 siblings, 1 reply; 5+ messages in thread
From: Lever, Charles @ 2002-09-19 20:00 UTC (permalink / raw)
  To: ashutosh.varshney; +Cc: nfs

please verify your configuration for me:

you are using NFS over UDP with 32K r/wsize?
your Linux clients run a 2.4 kernel, probably 2.4.18?

> > We had a lot of SUN machines and just installed few linux 
> machines.We
> > have all our licenses/Softwares of Solaris m/cs( NIS also 
> on Solaris).But
> > when we access the things from linux client..network 
> chokes..all things
> > hang..then we reboot the linux ..and set the rsize & wsize 
> to 8K and now
> > things work fine..
> > Can any one puts lights why this all happen ..where is the 
> problem.. in
> > linux or solairs.
> > Any site referneces for this customization..


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https://lists.sourceforge.net/lists/listinfo/nfs

^ permalink raw reply	[flat|nested] 5+ messages in thread
* RE: Problem : Linux - SOlaris NFS
@ 2002-09-20 15:18 Lever, Charles
  0 siblings, 0 replies; 5+ messages in thread
From: Lever, Charles @ 2002-09-20 15:18 UTC (permalink / raw)
  To: 'ashutosh.varshney@st.com'; +Cc: nfs

this looks like the famous "single NFS client DOS attack" bug.
when fragmenting IP packets, Linux can drop the remaining fragments
of an IP packet if it runs out of socket space during the fragmentation.
if this happens often enough, the server runs out of IP reassembly
queue space, and no one can talk to it.

enlarge your default socket buffer size with these instructions,
or use NFS over TCP instead, to prevent this from occurring.

1.	Become root on your client
2.	cd into /proc/sys/net/core
3.	echo 262143 > rmem_max
4.	echo 262143 > wmem_max
5.	echo 262143 > rmem_default
6.	echo 262143 > wmem_default
7.	Remount your NFS file systems on the client

or add these lines to /etc/sysctl.conf and reboot your system:

net.core.rmem_max = 262143
net.core.wmem_max = 262143
net.core.rmem_default = 262143
net.core.wmem_default = 262143

> Hi
> Yes ..we are using nfs over udp. . NFS server is Solaris 8 
> (with default
> r/wsize=32Kb) and NFS Client is Red Hat Linux 7.3 ( kernel version
> 2.4.18-3)..
> thanks for ur response
> ashutosh
> 
> > please verify your configuration for me:
> > 
> > you are using NFS over UDP with 32K r/wsize?
> > your Linux clients run a 2.4 kernel, probably 2.4.18?
> > 
> > > > We had a lot of SUN machines and just installed few linux 
> > > machines.We
> > > > have all our licenses/Softwares of Solaris m/cs( NIS also 
> > > on Solaris).But
> > > > when we access the things from linux client..network 
> > > chokes..all things
> > > > hang..then we reboot the linux ..and set the rsize & wsize 
> > > to 8K and now
> > > > things work fine..
> > > > Can any one puts lights why this all happen ..where is the 
> > > problem.. in
> > > > linux or solairs.
> > > > Any site referneces for this customization..
> > 
> > 
> > -------------------------------------------------------
> > This sf.net email is sponsored by:ThinkGeek
> > Welcome to geek heaven.
> > http://thinkgeek.com/sf
> > _______________________________________________
> > NFS maillist  -  NFS@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/nfs
> > 
> 


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^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2002-09-20 15:18 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2002-09-17  7:38 Problem : Linux - SOlaris NFS ashutosh.varshney
2002-09-19 17:23 ` Tom McNeal
  -- strict thread matches above, loose matches on Subject: below --
2002-09-19 20:00 Lever, Charles
2002-09-20  3:39 ` ashutosh.varshney
2002-09-20 15:18 Lever, Charles

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