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How can I give the highest priority to mail traffic on port 25 whit tc?

I tried prio option but It didn't work out for me or maybe I'm missing something.

I'd appreciate any help.

JimmySys
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    It would be useful to show us exactly what you've tried and say why that's not doing what you expect/want. – Paul Haldane Nov 09 '14 at 10:26
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    Thanks for your help: I use this command: `tc filter add dev eth0 protocol ip parent 10: prio 1 u32 match ip dport 22` – JimmySys Nov 09 '14 at 16:06
  • Answer to similar problem provided: https://serverfault.com/a/352035/420553 – Te Ri Sep 08 '17 at 18:37

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