Re: VLAN problem with netlink interface (kernel 2.4.25)

Fermín Galán Márquez wrote:
> Dear all,
> 
> Due to this is my first mail in this maillist, so let me introduce myself.
> My name is Fermín Galán, and I'm working at CTTC in applications related
> with VLANs.
> 
> I'm experiencing some problems using the VLAN support in Linux kernel 2.4.25
> (a bit old nowadays).
> 
> The problem appears after using vconfig to create and remove the same VLANs
> several times (for example, 'vconfig add eth0 111', then 'vconfig rem
> eth0.111', then 'vconfig add eth0 111', etc.). In this situation, the
> netlink kernel interface (AFAIK, a API/"protocol" that applications can use
> to get information about the interfaces known by the kernel) behaves weird:
> it returns information about "ghost" interfaces (interfaces that actually
> don't exist). I've checked this behaviour with applications that uses
> netlink (netlink.h). However, if the machine is rebooted and the VLANs
> created after the boot (but not deleted and created again) the problem
> dissapears and the netlink interface seems to work fine.
> 
> I would like to know if there are known issues in that kernel version
> (2.4.25), with VLAN, netlink or the combited use of both. Or maybe is a
> problem of 'vconfig' command (I don't know what is exactly my vconfig
> version; I've tried 'vconfig --version' but the program hasn't told me it
> :)? Any information/link/reference/etc is very welcome!
> 
> I would like also to know your opition about upgrating the kernel to a newer
> version (for example, the last stable one provided by kernel.org, 2.6.14.2).
> Do you think it could solve this problems? Have been significative
> improvements in VLAN support since 2.4.25? What about backward compability?

VLAN has had some improvements, and I am not aware of any serious bugs like
you mention in the latest code.  Please do try 2.4.32 or 2.6.14.2
and see if you can reproduce the problem.

Thanks,
Ben

> 
> Thank you very much in advance!
> 
> Best regards,
> 
> --------------------
> Fermín Galán Márquez
> CTTC - Centre Tecnològic de Telecomunicacions de Catalunya
> Parc Mediterrani de la Tecnologia, Av. del Canal Olímpic s/n, 08860
> Castelldefels, Spain
> Room 1.02
> Tel : +34 93 645 29 12
> Fax : +34 93 645 29 01
> Email address: [email protected]
> 
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-- 
Ben Greear <[email protected]>
Candela Technologies Inc  http://www.candelatech.com