Date: Mon, 1 Oct 2001 12:05:39 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: "Jasper O'Malley" <jooji@nickelkid.com> Cc: freebsd-net@freebsd.org Subject: Re: Netgraph bridging: what is LOCAL_IFACE? Message-ID: <Pine.BSF.4.21.0110011200370.86630-100000@InterJet.elischer.org> In-Reply-To: <Pine.BSF.4.21.0110011212500.36679-100000@cornflake.nickelkid.com>
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The bridging code connects to the lower (i.e. WIRE) part of each interface
mentionned an dintercepts all packets coming in.
If you want any of these packets to also be passed to the local machine
you should select one of the local interfaces (any will do) and add it in
the LOCAL_INTERFACE entry. This entry specifies to the bridging code that
the upper (i.e. KERNEL side) of that interface should also be added to the
list of recipients of the packets being worked on.
If you do not do this, the interfaces are linked to each other by the
bridging code, but the local machine is not party to the traffic. No copy
of the packets is sent up to it.. (this is a vaild configuration...)
On Mon, 1 Oct 2001, Jasper O'Malley wrote:
>
> I posted this message to -questions last week, but never got a response,
> so perhaps someone on this list (-net) can help out.
>
> I'm trying to learn more about the netgraph bridging module, and I ran
> across this comment in /usr/share/examples/netgraph/ether.bridge:
>
> [quote]
>
> # List the names of the interfaces that you want to bridge across
> # here in ${BRIDGE_IFACES}. If you want to include the local host
> # machine as well then set ${LOCAL_IFACE} as well (it may also be
> # listed in ${BRIDGE_IFACES}). Of course, any ${LOCAL_IFACE} must
> # be ifconfig(8)ured separately. If you don't want a ${LOCAL_IFACE}
> # then leave it defined as the emtpy string.
>
> [end quote]
>
> The sentence:
>
> If you want to include the local host machine as well then set
> ${LOCAL_IFACE} as well (it may also be listed in ${BRIDGE_IFACES}).
>
> is confusing. Can someone clarify what this says? Include the "local
> host machine" in what, exactly? What is meant by the "local host
> machine" in this context? What is the significance of the LOCAL_IFACE
> interface? Why would one want to define a LOCAL_IFACE, rather than simply
> using the bridge interface? Unfortunately, I don't yet know enough about
> netgraph in general to figure it out from reading the rest of the
> bridge-creation script.
>
> Cheers,
> Mick
>
>
>
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