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readme: mark filter is mandatory to avoid deadlocks

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bol-van
2024-10-14 19:56:33 +03:00
parent 390c9419e8
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docs/readme.eng.md
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@@ -97,7 +97,8 @@ Then we can reduce CPU load, refusing to process unnecessary packets.
`iptables -t mangle -I POSTROUTING -o <external_interface> -p tcp --dport 80 -m connbytes --connbytes-dir=original --connbytes-mode=packets --connbytes 1:6 -m mark ! --mark 0x40000000/0x40000000 -m set --match-set zapret dst -j NFQUEUE --queue-num 200 --queue-bypass`
Mark filter does not allow nfqws-generated packets to enter the queue again.
Its necessary to use this filter when also using `connbytes 1:6`. Without it packet ordering can be changed breaking the whole idea.
Its necessary to use this filter when also using `connbytes`. Without it packet ordering can be changed breaking the whole idea.
Also if there's huge packet send from nfqws it may deadlock without mark filter.
Some attacks require redirection of incoming packets :