Question about accept filters

Borja Marcos via bind-users <[email protected]> Tue, 10 Mar 2026 15:03:40 +0100

Newsgroups	gmane.network.dns.bind9.user,gmane.network.dns.bind.user
Message-ID	<[email protected]>

Hello,

In the Bind 9 ARM (for example, for version 9.20.20) there is a mention of the kernel level “accept” filters. The text for the "tcp-listen-queue”  statement
says "If the kernel supports the accept filter "dataready", this also controls how many TCP connections are queued in kernel space waiting for some data
before being passed to accept.”.

At least on FreeBSD, as far as I know, you need to explicitly add a filter to a socket using the SO_ACCEPTFILTER  socket option and  I can’t find a mention of that
constant at least in the 9.20 sources, except for a note in the changelog-history.rst stating "Temporarily disable SO_ACCEPTFILTER support. [RT #22589]” among the changes for 9.8b1.

I presume that functionality has been permanently removed? 



Thanks!





Borja Marcos.

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