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Date:      Mon, 08 Jan 2018 18:47:43 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-net@FreeBSD.org
Subject:   [Bug 224961] VLAN ID 0 Not Supported
Message-ID:  <bug-224961-2472-W1QYKKD9Kx@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-224961-2472@https.bugs.freebsd.org/bugzilla/>
References:  <bug-224961-2472@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224961

Eugene Grosbein <eugen@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |eugen@freebsd.org

--- Comment #3 from Eugene Grosbein <eugen@freebsd.org> ---
(In reply to johnllyon from comment #2)

Incoming ethernet frames tagged with zero vlan tag are not correct, so first
operation should be conversion of such frames to standard untagged frames.

ng_vlan should perform this flawlessly if configured with command like "ngc=
tl
msg vlan: addfilter '{ vlan=3D0 hook=3D"untagged" }' and hook "untagged" co=
nnected
to ng_eiface node that creates ngeth0 interface.

Also, ng_vlan's "downstream" hook should be connected to ng_ether node
corresponding "real" interface like em0 and its hook "lower". Then real
interface passes incoming packets to ng_vlan instead of normal delivery.
ng_vlan strips incorrect vlan tag and result is delivered normally as recei=
ved
from ngeth0.

Ethernet frames received without vlan tag will be dropped by this comple sc=
hema
but it is possible to process them too by inserting ng_tee node into the gr=
aph.
ng_tee is capable of combining two streams of data into single one and pass=
ing
it to arbitrary next node.

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