On Sunday 31 August 2008, Frank Mehnert wrote: > On Sunday 31 August 2008, Mag Gam wrote: > > I am using Debian as my guests and Ubuntu as Host. > > What is a TAP interface? > > TAP device == host interface networking. See the user manual for a > detailed description on how to set up this network interface on a > Linux host. > > > I am using PCNET FastIII as my interfaces. > > So could you check please if there is some difference in the performance > if you switch to E1000 instead? > > For comparison: I have a Debian/Sid host here and a Debian/Etch guest > connected with a Ubuntu/Gutsy guest over an internal network. With > wget I achieve a data rate of ~48 MByte/s from one VM to the other. > > You might also check with traceroute in the guest that the network > packets are routed only through the internal network interface.
Keep in mind that an internal network interface does not receive an IP automatically because there is usually no DHCP server attached to such an interface. So you should assign an IP manually, for instance: VM1: ifconfig eth1 192.168.5.1 netmask 255.255.255.0 VM2: ifconfig eth1 192.168.5.2 netmask 255.255.255.0 I assume that eth0 is the NAT interface on both VMs and eth1 is the internal network. You also want to disable the NAT interface (perhaps disconnect the network cable in the VM settings) to make sure the traffic is NOT routed through the NAT interface. Kind regards, Frank -- Dr.-Ing. Frank Mehnert Sun Microsystems http://www.sun.com/
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