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From Vadim Kimlaychuk <>
Subject RE: Confusable default routing table on SSVM.
Date Wed, 12 Nov 2014 07:46:32 GMT

         It might happen if you have basic zone setup. We have implemented such configuration
with XenServer, but it is confusable indeed. It is better to have differen LAN-s (VLANs) and
partition the network properly.  External L2/L3 switch is also a requirement.


-----Original Message-----
From: Dan Dong [] 
Sent: Wednesday, November 12, 2014 1:24 AM
Subject: Re: Confusable default routing table on SSVM.

Hi, All,
  Can experts examine the settings above if they are problematic? Could Management Server,
KVM host and VMs all sit in the same network? I checked a lot but have no idea,
all firewalls have been turned off but still the SSVM could not contact Management server
and the outside.
Thanks a lot!


2014-11-11 10:29 GMT-06:00 Dan Dong <>:

> 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
> dev eth0  proto kernel  scope link  src
> dev eth1  proto kernel  scope link  src
> dev eth2  proto kernel  scope link  src
> dev eth3  proto kernel  scope link  src
> There are 3 rules to reach the same subnet of through 
> different NICs.
> The problem is that SSVM could not ping both the KVM 
> host( on which the SSVM is running and the Management 
> Server(, it is also set to be the gateway of the 
> 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
>     netmask
>     network
>     broadcast
>     gateway
>     dns-nameservers
> #=============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
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