문제

As far as I know, in order to carry IP packets, we need a link protocol. Is there any exception of this?

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해결책

Some tunnel protocols can be seen as exceptions. IP tunnels encapsulate an IP packet into another one. At the end a link protocol is needed to carry the resulting packet, but not directly to handle the first one.

You can take a look at IP in IP, 6in4 or 4in6.

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