Re: [Openvpn-users] Windows client, mysterious routes and MTU issues

[Erich Titl <erich.titl@xxxxxxxx>]

John

John A. Sullivan III wrote:
> Hello, all.  We are seeing some bizarre behavior with our Windows
> OpenVPN clients.  We are not seeing the same behavior in the Linux
> clients.  Our setup is an OpenVPN gateway running openswan connecting to
> other offices via openswan.  I am just now beginning to peruse the more
> obscure configuration settings and do some extensive testing but, if
> anyone knows the answer off the top of their head, it will save me many
> hours.
>
> Whenever the windows client accesses a station in one of the offices,
> i.e., across the openswan VPN, an entry for that station is added to the
> Windows routing table.  Although that is surprising, it would not be too
> bad except that the MTU on the route is set to 576! 

Did you disable PMTU discovery on Windoze? The reduced MTU size could be 
one of the indications. The surprising thing is, how else would the 
windows client know that his OpenVPN connection is futher tunneled 
through an OpenSwan connection?

The result is
> massive packet fragmentation.

:-) No surprise

cheers

Erich



____________________________________________
Openvpn-users mailing list
Openvpn-users@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/openvpn-users