Problems with UDP frame size??

[Donald Pearson]

Well this has had me stumped for days now.

For months I've been using tinc in TCPOnly because I always received the
unknown host error when using UDP.

On Monday, i set the flag IndirectData = yes in my host files, and removed
the TCPOnly line.

Initially, everything worked great.   My throughput increased from 600KB/sec
to 2MB/sec between the sites.

However, I also did some testing with compression settings in the host
files.

On the first test after setting Compression = 10, I lost full
functionality.   I can still establish the VPN, and hosts are able to ping
between eachother, but if I try to transfer a file for example, it will not
work.

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.

Both hosts are running Windows XP.

Host files;

Address = argyle.thruhere.net
Port = 8002
IndirectData = yes
# PMTU = 1024
# PMTUDiscovery = no
#TCPOnly = Yes
-----BEGIN RSA PUBLIC KEY-----
Address = nixon.endoftheinternet.org
Port = 8003
IndirectData = yes
# PMTU = 1024
# PMTUDiscovery = no
#TCPOnly = Yes
-----BEGIN RSA PUBLIC KEY-----

tinc.conf for both is very simple;

Name = <Argyle | Nixon>
ConnectTo = <Argyle | Nixon>
Interface = Tinc
Mode = switch
#
#


Thoughts?

Thanks!

Donald
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