[Xen-users] OpenVPN and Xen PV

[Aleix Dorca <adorca@xxxxxx>]

Hi all,

I've recently moved my old phisical machines into a Xen 3.3 PV  
environment. Everything has gone smoothly and fine... but I've found  
some problems when deplyoing the VPN servers.
The thing went like this:

I installed, either OpenVPN or L2TP over IPSEC, in a PV Debian machine  
over Xen 3.3. The services seemed to run fine under low traffic (SSH,  
RDP...) but when packets became bigger (HTTP or SMB) I started to get  
lots of ICMP Dest Unreachable packets from the VPN PV machine to the  
servers with the services mentioned and the performace descended to  
impractical levels.
After some discussion on the OpenVPN mailing list that had no effects  
(like trying to deal with MTU and such) I installed a new Debian on  
Xen, but this time using HVM (full virtualization). In this machine  
all works fine, no ICMP packets.
Seeing this I tried once againg to boot the HVM machine using the Dom0  
kernel in PV and problems appeared again.
I know it's kind of weird but maybe someone has an OpenVPN running in  
a PV environment and modified something i didn't. Any help would be  
appreciated!
Thanks,

Aleix Dorca.



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