questions

[newbie <m1lu@yahoo.com>]

Hi:

I have some questions on
"draft-ietf-udlr-lltunnel-02.txt".

2) can anyone here explain scenario 1 to 4?
2) In section 6:

A datagram is delivered from the network layer to the
link layer of the unidirectional interface (see Figure
2). It is then encapsulated behind a MAC header
corresponding to the unidirectional link. This packet
cannot be sent over the link and is then processed by
the tunneling mechanism.

The packet is encapsulated behind an IP header whose
destination is the IP address of a feed bidirectional
interface (f1b or f2b), also called the tunnel
end-point.

f1b or f2b, according to the figure 1, was the
interface(s) connecting to bidirectional internet. But
the text in section 6 seems to say that the tunnel
goes through the bidirectional internet, instead of
forming a virtual symmetric link between f1u and x1u.

TIA

-mll
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