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Understanding pf with FTP on IPv6


I am running a dual-stack host that I'm currently seeing a strange issue (or at least an issue I don't understand :) ) with outgoing (client) FTP connections over IPv6.

Basically my pf.conf contains a "block in all" at the start and a bunch of rules that allow some stuff to connect on regular ports inbound.

FTP client (outbound) from this host works fine over IPv4 but will fail over IPv6 unless I comment out this line.

Is this difference in behaviour expected?

Any thoughts much appreciated.

Best regards,


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