RE: HELP: NFS mount hangs when attempting to copy file

[Roger Heflin]

A kde and gnome are well above MTU they don't know anything
about MTU and neither does NFS, if those hang it up you have
a network configuration problem, and should probably fix it, 
as a number of other things will show the problem also.

Routers almost always have hard coded MTU limits, and they are
almost never the default 1500, so everything needs to be
properly told what your networks MTU is, or some external
device needs to be taking care of it properly.

                    Roger

> -----Original Message-----
> From: linux-kernel-owner@xxxxxxxxxxxxxxx 
> [mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] On Behalf Of 
> Timothy Miller
> Sent: Saturday, July 23, 2005 9:52 PM
> To: Trond Myklebust
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: HELP: NFS mount hangs when attempting to copy file
> 
> On 7/23/05, Trond Myklebust <trond.myklebust@xxxxxxxxxx> wrote:
> 
> > I beg to disagree. A lot of these VPN solutions are 
> unfriendly to MTU 
> > path discovery over UDP. Sun uses TCP by default when mounting NFS 
> > partitions. Have you tried this on your Linux box?
> 
> I changed the protocol to TCP and changed rsize and wsize to 
> 1024.  I don't know which of those fixed it, but I'm going to 
> leave it for now.
> 
> As for MTU, yeah, the Watchguard box seems to have some 
> hard-coded limits, and for whatever reason KDE and GNOME 
> graphical logins do something that exceeds those limits, 
> completely independent of NFS, and hang up hard.
> 
> Thanks.
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