[Bug 235909] net/dual-dhclient: does not survive a netif restart

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235909

            Bug ID: 235909
           Summary: net/dual-dhclient: does not survive a netif restart
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: cperciva at FreeBSD.org
          Reporter: hsw at bitmark.com
             Flags: maintainer-feedback?(cperciva at FreeBSD.org)
          Assignee: cperciva at FreeBSD.org

Created attachment 202219
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=202219&action=edit
replacement dual-dhclient

when using net/dual-dhclient and doing a service netif restart the DHPv6
address is lost.  This is because the dhclient6 is not killed during the stop
process since the base dhclient is unaware of the /var/run/dhclient6.pid file
to terminate the second dhclient.

As a quick workaround replace the installed /usr/local/sbin/dual-dhclient with
the attached script.  The script just adds these two lines just befor starting
the dhclients

    pid6=/var/run/dhclient6.pid
    [ -n "${pid6}" ] && kill $(cat "${pid6}")

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