[Bug 215545] net/mDNSResponder mdnsd doesn't bind to second interface

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215545

            Bug ID: 215545
           Summary: net/mDNSResponder mdnsd doesn't bind to second
                    interface
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet at FreeBSD.org
          Reporter: kika at kikap.com
          Assignee: sunpoet at FreeBSD.org
             Flags: maintainer-feedback?(sunpoet at FreeBSD.org)

Created attachment 178258
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178258&action=edit
disable SO_REUSEADDR for FreeBSD and enable SO_REUSEPORT instead

I have a dual-homed machine which advertises mDNS resources to only one
network. After running the mdnsd in debug mode I discovered that it reports
"bind: address already in use" when trying to bind to the second interface. 
It appears that on FreeBSD using SO_REUSEADDR is not enough and one needs to
use SO_REUSEPORT to successfully receive unicast and multicast packets on the
same port on multiple interfaces.

Suggested patch was made against latest Apple upstream version
"mDNSResponder-765.20.4"

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