Problems with UDP frame size??

[Donald Pearson]

Does this mean I will need to manually set the PMTU value, or is the default
value of 1518 (I think?) okay?

If not, do you have a suggested value?

Thank you for your help as always,

Donald

On Fri, Mar 6, 2009 at 5:53 PM, Guus Sliepen <guus at tinc-vpn.org> wrote:

> On Thu, Mar 05, 2009 at 07:02:53PM -0500, Donald Pearson wrote:
>
> [...]
> > I removed the Compression line from the hosts files, and went back to the
> > working UDP configuration that gave me 2MB/sec.
> >
> > However the problem did not go away.  I say I think there is an IP/UDP
> frame
> > size issue because the firewall software I use, SoftPerfect Personal
> > Firewall, is reporting this error in it's logs when I try to do something
> > like a file transfer.
> >
> > I am able to ping between hosts with packet sizes up to 1417 bytes.
> >
> > I did some testing with setting the PMTU value and setting PMTUDiscover =
> > no, however it had no affect.
>
> It seems there is a problem if both PMTUDiscovery and Compression is used.
> Another problem is that both sides must have PMTUDiscovery = no, otherwise
> it
> will still be enabled anyway. Michael Tokarev has also seen this problem.
> I'll
> have a better look at the code and I'll try to reproduce it myself, and see
> if
> I can fix it.
>
> In the mean time, the workaround is to explicitly disable PMTUDiscovery and
> Compression.
>
> --
> Met vriendelijke groet / with kind regards,
>     Guus Sliepen <guus at tinc-vpn.org>
>
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