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+--- Thread: [Server] Block/reject queries with opcode 'c' using iptables (/showthread.php?tid=807)
Block/reject queries with opcode 'c' using iptables - AdrianBZG - 2019-09-27
Hi,
I have seen some servers that even tho they have less than 100 players, the players are not listed in the server browser. This is obviously a measure against UDP query flood to the server.
I was wondering if someone could help me or tell me how to do the exact same thing.
Does this require to block SAMP UDP packets with a specific opcode using iptables, e.g. opcode 63 (flag c), which is the one that gives the players info? See https://wiki.sa-mp.com/wiki/Query_Mechanism#Opcodes for info about opcodes.
I tried with this iptables rules, but it's not working, I still get the server info in the server browser:
iptables -I INPUT -p udp --dport 7777 -m string --algo kmp --hex-string '|53414d50|' -m string --algo kmp --hex-string '|611e63|' -j DROP
I'm not sure how to do that, please help.
Thanks.