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I''m using iproute2-ss010824 and a 2.4.20 kernel. Quite a subtle issue here, so I can imagine it has not been spotted before. The setup: I have set up a machine as a gateway. The ''external'' interface uses a dummy IP address (eg. 10.0.0.2) and the internal side is a normal address. (it''s more complex in real life using Zebra and such, but this is the basic

https://bugzilla.netfilter.org/show_bug.cgi?id=1766 Bug ID: 1766 Summary: nfqueue randomly drops packets with same tuple Product: netfilter/iptables Version: unspecified Hardware: x86_64 OS: All Status: NEW Severity: major Priority: P5 Component: netfilter hooks Assignee: