Re: Confusable default routing table on SSVM.

[Gopalakrishnan S]

Hi Dan,

It may caused your KVM host bridge settings. Please make sure its working 
fine using this command.

[root@kvm ~]# brctl show

Also check the KVM host  /etc/cloudstack/agent/agent.properties file network 
segregation settings.

guest.network.device=cloudbr0
private.network.device=cloudbr1


Thank You.
Gopalakrishnan.S


----- Original Message ----- 
From: "Dan Dong" <dongda...@gmail.com>
To: <users@cloudstack.apache.org>
Sent: Tuesday, November 11, 2014 9:59 PM
Subject: Confusable default routing table on SSVM.


Hi, All,
 When debugging why my SSVM could not access outside, I see the following
route table on SSVM:
 root@s-1-VM:~# ip route show
169.254.0.0/16 dev eth0  proto kernel  scope link  src 169.254.1.47
192.168.0.0/24 dev eth1  proto kernel  scope link  src 192.168.0.22
192.168.0.0/24 dev eth2  proto kernel  scope link  src 192.168.0.134
192.168.0.0/24 dev eth3  proto kernel  scope link  src 192.168.0.25

There are 3 rules to reach the same subnet of 192.168.0.0/24 through
different NICs.
The problem is that SSVM could not ping both the KVM host(192.168.0.101) 
on
which the SSVM is running and the Management Server(192.168.0.100, it is
also set to be the gateway of the 192.168.0.0/24 network), although they
are all on the same subnet. I suspect it is the bridge setings of the KVM,
but no clues yet. Any hints?

root@comp11:/etc# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto em1
iface em1 inet static
   address 192.168.0.101
   netmask 255.255.255.0
   network 192.168.0.0
   broadcast 192.168.0.255
   gateway 192.168.0.100
   dns-nameservers 192.168.0.100

#=============CloudStack Network Bridges============
# Public network
auto cloudbr0
iface cloudbr0 inet manual
   bridge_ports em1.200
   bridge_fd 5
   bridge_stp off
   bridge_maxwait 1

# Private network
auto cloudbr1
iface cloudbr1 inet manual
   bridge_ports em1.300
   bridge_fd 5
   bridge_stp off
   bridge_maxwait 1


Cheers,
Dan