How can I check if an iptables rule already exists?

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Track title: CC G Dvoks String Quartet No 12 Ame 2

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Chapters
00:00 Question
00:34 Accepted answer (Score 67)
01:01 Answer 2 (Score 13)
02:44 Answer 3 (Score 9)
03:17 Answer 4 (Score 4)
03:50 Thank you

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Full question
https://superuser.com/questions/360094/h...

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Tags
#iptables

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