Re: ip_queue & QUEUE target

[Patrick McHardy <kaber@trash.net>]

Hi Nigel,

Nigel Kukard wrote:

>Hi all,
>
>I have a very interesting problem, I have all packets passing through my
>firewall being thrown to userspace with -j QUEUE, I them pick certain
>packets and generate statistics.
>
>My problem comes when I do a ping -f, at random times will my small
>program just not receive any packets. I'm using ipq_read with a timeout
>of 250000ms. I also get "Timeout" error messages when using ping -f.
>
>I've tried to re-open the IPQ handle each time it fails, to no avail.
>
>
>does anyone know how i can solve this problem?
>  
>

netlink sockets provide unreliable communication. your problem is
probably the sockets receive queue overflowing. ip_queue then
returns a negative error code to nf_queue which drops the packet.

Hope that helps,
Patrick

>Regars
>
>Nigel Kukard
>
>  
>