[Bug 227888] random port selection for daemons causes other daemons to fail
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Sun May 31 10:33:00 UTC 2020
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227888
--- Comment #2 from Andriy Gapon <avg at FreeBSD.org> ---
Unfortunately, RPC does not have default ports. They are picked up from a
special range. It's been this way forever, AFAIK.
One "solution" is to request a fixed port for each RPC-based service if a
service provides such option.
Another solution is to play with lowlast / lowfirst sysctl-s under
net.inet.ip.portrange.
Another potential solution is to exclude all well-known ports (/etc/services)
from RPC's use. That would automatically work for all but there can be some
challenges.
If you are curious, please see IP_PORTRANGE_LOW in the source code.
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