bin/60325: unbound emits warning: so-sndbuf 4194304 was not granted

["roy%marples.name@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60325
>Category:       bin
>Synopsis:       unbound emits warning: so-sndbuf 4194304 was not granted
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 12 16:55:01 +0000 2026
>Originator:     Roy Marples
>Release:        NetBSD-11.99.6
>Organization:
>Environment:
>Description:
warning: so-sndbuf 4194304 was not granted. Got 9216. To fix: s
tart with root permissions(linux) or sysctl bigger net.core.wmem_max(linux) or kern.ipc.maxs
ockbuf(bsd) values. or set so-sndbuf: 0 (use system value).

None of the sysctls mentioned exist on NetBSD and I don't see an obvious one via sysctl -a
>How-To-Repeat:
Start unbound with a default config
>Fix:
server:
     so-sndbuf: 0