Re: [vserver] Static Route on Loopback

From: Rik Bobbaers <>
Date: Fri 15 Oct 2010 - 13:04:23 BST
Message-ID: <>

might be a stupid remark, but if you want machines to talk to each other
inside the same network, you have to put them in the same network

so, if you configure: and, then these 2 machines are on a
different network, so outgoing traffic will go via it's network with the
default route, which is your 192.168.1.x/24 network.

So... i suggest you configure the interface on lo on at least
(or maybe more clear: 24) and go with that....

What's the reason you put /32 on those lo interfaces? what will you use
them for?


Rik Bobbaers

linux/unix/system/network/security/hardware admin
infrastructure architect

> I just confirmed that using dummy interfaces with a real netmask does
> actually make things work the way I want. I notice the lo /32 interface
> still gets created with the same IP. Are there any drawbacks in doing it
> this way?
> Gordan
> Gordan Bobic wrote:
>> Adrian Reyer wrote:
>>> Hi Gordon,
>>> On Thu, Oct 14, 2010 at 10:22:15PM +0100, Gordan Bobic wrote:
>>>> Is there a way to add a static route to a VM on loopback?
>>> You don't need to. As the guest has no network, it doens't need to
>>> route, either. The kernel has the network and does the routing.
>>> Do you experience any problems with this setup?
>> Yes I am seeing a problem with this setup.
>> Host A:
>> lo:
>> eth0:
>> Host B:
>> lo:
>> eth0:
>> When host A connects to, the connection looks like it came
>> from, rather than I don't want my app on host B
>> binding on listening on interface. I want the connection
>> to be going via the internal loopback only. I also want to keep the
>> iptables rules relatively sane and intuitive.
>> Normally, this would be implicit by the network scope, but since lo is
>> different and setting on it would make the local host
>> respond on the entire range, I need an alternative solution that would
>> work more sensibly. Would using a dummy network device work for this? Or
>> is there a better way?
>> Gordan
Received on Fri Oct 15 14:23:29 2010

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