netdev - Re: Loopback and net namespace

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Message-ID: <49F36976.4090701@free.fr>
Date:	Sat, 25 Apr 2009 21:50:14 +0200
From:	Daniel Lezcano <daniel.lezcano@...e.fr>
To:	emil@...ux.org.pl
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	ebiederm@...well.aristanetworks.com
Subject: Re: Loopback and net namespace

David Miller wrote:
> From: emil@...ux.org.pl
> Date: Fri, 24 Apr 2009 23:55:36 +0200 (CEST)
>
>   
>> Currently it is impossible to use both net namespace and sysfs
>> because sysfs does not allow two devices with the same name
>> and each net namespace has to have loopback device.
>>
>> To have this working there must be possibility to
>> create loopback devices with different names.
>>
>> The easiest way to acomplish this seems to be with this patch below.
>>
>> I know the devices will be seen in each namespace, but sometimes
>> the only thing that is needed is network environment separation.
>> For example when I need to run two different services on the same TCP
>> port
>> bound to 0.0.0.0.
>>
>> This patch will not break anything and allow people to test
>> net namespace functionality.
>>     
I don't think you have to patch anything if you try a kernel >= 2.6.29.
The sysfs restriction has been solved by disabling the registering of 
the kobject when we are not in the initial network namespace.

For more information you can check this commit:

http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6-stable.git;a=commit;h=3891845e1ef6e6807075d4241966b26f6ecb0a5c

Regards,
  -- Daniel
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