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From: Julian Elischer <julian@elischer.org>
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Subject: -current  link layer spaghetti diagram
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A first attempt can be seen at:
http://www.freebsd.org/~julian/layer2-current.pdf

this is not a call graph, but a diagram of where packets can be passed.

comments from vlan, pfil, CARP. if_bridge  developers are welcome.
those new-fangled bits worry me :-)

julian