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I have opened a number of ports, and am familiar enough with pfctl, but even though I have opened various ports, then show up as "filtered" - which means of course that they are not open.

How can I open them, or is it a function of having a suitable app using them? For example

pass in proto tcp from any to any port 53

In a scan this shows up as

53 dns Filtered

How can I open this port?

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1 Answer 1

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Usually port scanners use UDP and TCP to scan port. Since most implementations of DNS servers use UDP you probably also have to open 53/udp:

pass in proto udp from any to any port 53
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  • PORT STATE SERVICE 53/udp open|filtered domain 53/tcp Filtered
    – Harry McGovern
    Commented Oct 17, 2015 at 11:15
  • the command above in pf.conf just opens the UDP port, doesn't change the "filtered" flag for tcp
    – Harry McGovern
    Commented Oct 17, 2015 at 11:18

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