[Bug 197269] net-mgmt/iftop 1.0pre4 unable to detect IPv6 traffic on pure monitoring interface

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197269

            Bug ID: 197269
           Summary: net-mgmt/iftop 1.0pre4 unable to detect IPv6 traffic
                    on pure monitoring interface
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: vd at FreeBSD.org
          Reporter: Trond.Endrestol at ximalas.info
          Assignee: vd at FreeBSD.org
             Flags: maintainer-feedback?(vd at FreeBSD.org)

I'm running an IDS with the bce1 interface configured as a pure monitoring
interface, i.e.:

ifconfig_bce1="up monitor promisc"

This results in:

bce1:
flags=68943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC,MONITOR>
metric 0 mtu 1500
       
options=c01bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO,LINKSTATE>
        ether XX:XX:XX:XX:XX:XX
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active

Other software, like net-mgmt/darkstat, are able to detect and extract IPv6
traffic from the same interface.

net-mgmt/iptop is able to detect and extract IPv6 traffic on proper interfaces,
e.g. non-monitoring interfaces.

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Auto-assigned to maintainer vd at FreeBSD.org

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