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What services does nftables know the ports of?
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bulletbill22
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PostPosted: Thu Jul 11, 2024 7:17 pm    Post subject: What services does nftables know the ports of? Reply with quote

For example, to accept ssh, http, and https traffic you can use
Code:
tcp dport {ssh,http,https} accept
instead of using
Code:
tcp dport {22,80,443} accept
What other services can be named rather than using ports?
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pa4wdh
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PostPosted: Thu Jul 11, 2024 7:22 pm    Post subject: Reply with quote

nftables itself uses only port numbers, i expect (but did not check the code) it uses the system resolver for service names which uses /etc/services by default.
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pietinger
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PostPosted: Thu Jul 11, 2024 9:11 pm    Post subject: Reply with quote

pa4wdh wrote:
nftables itself uses only port numbers, i expect (but did not check the code) it uses the system resolver for service names which uses /etc/services by default.

Yes ... the same is true for /etc/protocols ... so you can use names like TCP and UDP (instead of its numbers 6 and 17).
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