It might also be important to know that both machines are xen domU servers.
The client machine is an Ubuntu Lucid domU with a 2.6.32-22-server kernel running on a Centos 5.4 dom0 with a 2.6.18-149.el5xen kernel and a Xen 3.4.2 server.
The server machine is a Debian Etch domU with a 2.6.18-164.el5xen kernel running on a Centos 5.4 dom0 with a 2.6.18-164.el5xen kernel and a Xen 3.3.0 server.
It might also be important to know that both machines are xen domU servers.
The client machine is an Ubuntu Lucid domU with a 2.6.32-22-server kernel running on a Centos 5.4 dom0 with a 2.6.18-149.el5xen kernel and a Xen 3.4.2 server.
The server machine is a Debian Etch domU with a 2.6.18-164.el5xen kernel running on a Centos 5.4 dom0 with a 2.6.18-164.el5xen kernel and a Xen 3.3.0 server.