Packet loss when using NFQUEUE and nf_conntrack_ipv4

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Hi all

When using NFQUEUE and nf_conntrack_ipv4 together, there is a brief
window at the beginning of each stream where packets are lost. The
first packet for a given conntrack tuple is sent to userspace,
NF_ACCEPT'd using nfq_set_verdict and forwarded on by the kernel, as
expected. Any packets transmitted within a small window (microseconds,
depending on hardware) after the first packet, are received by the
userspace program, the call to nfq_set_verdict suceeds but the kernel
doesn't forward the packet on. Any packets transmitted after this
window are received and forwarded correctly.

Is this a known issue?

Thanks

-- 
Daniel Collins
Junior Developer
daniel.collins@xxxxxxxxxxxxxx

Smoothwall Ltd
Phone: +44 (0­) 8701 999500
www.smoothwall.net

Smoothwall Limited is registered in England, Company Number: 4298247
and whose registered address is 1 John Charles Way, Leeds, LS12 6QA
United Kingdom
Any opinions stated in this message are solely those of the author.
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