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geek.de.nz 1st July 2006 14:50

Routing question virtual machines
 
Hi, I've searched this forum extensively but didn't find an answer to my question(s):

My setup:
router/adsl modem is on ip 10.0.0.11/8 (has dns server)
My main linux box (ubuntu 5.10 with 2.6.16-suspend2 kernel) is on ip 10.0.0.4 called lexo
My vmware vm (under main box):
debian etch on ip 192.168.0.2

I've added a virtual ip for 10.0.0.4 of 192.168.0.1 by doing the follwing:
Code:

ifconfig eth0:0 192.168.0.1 netmask 255.255.255.0 up
Output of:
Code:

etch:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:6F:B6:A3
          inet addr:192.168.0.2  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe6f:b6a3/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:37996 errors:0 dropped:0 overruns:0 frame:0
          TX packets:295 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:7476327 (7.1 MiB)  TX bytes:24318 (23.7 KiB)
          Interrupt:177 Base address:0x1400
 ...
etch:~# route -nee
Kernel IP routing table
Destination    Gateway        Genmask        Flags Metric Ref    Use Iface    MSS  Window irtt
192.168.0.0    0.0.0.0        255.255.255.0  U    0      0        0 eth0    0    0      0
0.0.0.0        192.168.0.1    0.0.0.0        UG    0      0        0 eth0    0    0      0

root@lexo:~# cat /etc/sysctl.conf
#
# /etc/sysctl.conf - Configuration file for setting system variables
# See sysctl.conf (5) for information.
#
# Be warned that /etc/init.d/procps is executed to set the following
# variables.  However, after that, /etc/init.d/networking sets some
# network options with builtin values.  These values may be overridden
# using /etc/network/options.

#kernel.domainname = example.com
#net/ipv4/icmp_echo_ignore_broadcasts=1
dev.cdrom.lock=0
# Enables packet forwarding
net.ipv4.ip_forward=1

root@lexo:~# sysctl -p

root@lexo:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:05:1C:01:7C:85
          inet addr:10.0.0.4  Bcast:10.255.255.255  Mask:255.0.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8624 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7796 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:3390769 (3.2 MiB)  TX bytes:1260345 (1.2 MiB)
          Interrupt:11 Base address:0xb800

eth0:0    Link encap:Ethernet  HWaddr 00:05:1C:01:7C:85
          inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:11 Base address:0xb800
  ...
root@lexo:~# route -nee
Kernel IP routing table
Destination    Gateway        Genmask        Flags Metric Ref    Use Iface    MSS  Window irtt
172.16.231.0    0.0.0.0        255.255.255.0  U    0      0        0 vmnet1  0    0      0
192.168.0.0    0.0.0.0        255.255.255.0  U    0      0        0 eth0    0    0      0
172.16.120.0    0.0.0.0        255.255.255.0  U    0      0        0 vmnet8  0    0      0
10.0.0.0        0.0.0.0        255.0.0.0      U    0      0        0 eth0    0    0      0
0.0.0.0        10.0.0.11      0.0.0.0        UG    0      0        0 eth0    0    0      0

OK. But routing seems to not work properly:
Code:

etch:~# ping -c 3 10.0.0.11
PING 10.0.0.11 (10.0.0.11) 56(84) bytes of data.
From 192.168.0.1: icmp_seq=1 Redirect Host(New nexthop: 10.0.0.11)
From 192.168.0.1: icmp_seq=4 Redirect Host(New nexthop: 10.0.0.11)
From 192.168.0.1: icmp_seq=10 Redirect Host(New nexthop: 10.0.0.11)

--- 10.0.0.11 ping statistics ---
28 packets transmitted, 0 received, 100% packet loss, time 27004ms

and when I do:
Code:

etch:~# ping -c 1 google.com
ping: unknown host google.com

But dns is working on the (real) router/adsl modem and I can ping google.com from lexo.

I just want to understand how routing works in unix. Am I on the right track? Is this problem maybe because I'm using everything virtually (virtual ip vmware vms etc.)? It should still work shouldn't it? What is wrong? I thought this would be the simplest setup, but it turns out to be not working. If you need any more outputs, please tell me so. Thanks in advance :-).

Or is it not working because eth0 on lexo is shared and has the same MAC address??

Does anyone know what the vmnet settings (routing table) are for and why they are in a different subnet? Is that maybe the problem? Can I just delete them or are they important? How is it in Xen?

falko 2nd July 2006 18:13

Usually VMware does everything for you to configure bridging and/or NATting...

You might want to have a look here to see how it works with Xen:
http://www.howtoforge.com/perfect_setup_xen3_debian_p6
http://www.howtoforge.com/perfect_xe...bian_ubuntu_p6


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