[Xen-users] Network-problems with multiple(16) virtual machines

["Rustedt, Florian" <Florian.Rustedt@xxxxxxxxxxx>]

Hello list,

I am doing my first tests with xen-3.3.0 on gentoo and am now running
against an unprotocolled limit?

I start 16 exactly equal domains. Each receives an IP via dhcp. Now i
can ping dom0 (192.168.10.10) from every domU (192.168.10.100 - 115,
names are "xen-gentoo-default10..25").

The curious thing is now, that the domains 17 and 20-25 are not able to
reach the outer world? Nor there are log-entries concerning this?

I tried this again for aprovement with an "ping www.yahoo.de" just to
see that dns works. And as told before, all domU are working except
theese seven ones?

Via google i found the hint for changing "nloopbacks", but this didn't
help either?

As you can see in dmesg, i added the options (all modules are builtin).
In ifconfig, there are 16 vifs' listed.

Anybody can help? Downwards i added dmesg, ifconfig and grub-config..

Kind regards, Florian

Dmesg:
--------------------------------
Linux version 2.6.21-xen (root@XEN0) (gcc version 4.1.2 (Gentoo 4.1.2
p1.0.2)) #4 SMP Tue Nov 4 11:24:23 CET 2008
Command line: root=/dev/sda1 console=tty0 loopback.nloopbacks=255
nloopbacks=255 max_loop=255
[...]
--------------------------------

# ifconfig|grep Ethernet :
--------------------------------
eth0      Link encap:Ethernet  HWaddr 00:21:5b:d1:a6:a7
peth0     Link encap:Ethernet  HWaddr 00:21:5b:d1:a6:a7
vif1.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif10.0   Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif11.0   Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif12.0   Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif13.0   Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif14.0   Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif15.0   Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif16.0   Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif2.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif3.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif4.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif5.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif6.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif7.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif8.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
vif9.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
--------------------------------

Grub-config:
--------------------------------
root (hd0,0)
title           Xen 3.3.0 kernel 2.6.21-xen
kernel          /boot/xen-3.3.0.gz
module          /boot/vmlinuz-2.6.21-xen root=/dev/sda1 console=tty0
loopback.nloopbacks=255 nloopbacks=255 max_loop=255
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