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Re: [Question #229409]: How to know flow of packet after be compressed

To: rohc@xxxxxxxxxxxxxxxxxxx
From: Didier Barvaux <question229409@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 23 May 2013 17:31:19 -0000
Reply-to: question229409@xxxxxxxxxxxxxxxxxxxxx
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Question #229409 on rohc changed:
https://answers.launchpad.net/rohc/+question/229409

    Status: Open => Answered

Didier Barvaux proposed the following answer:
Hello,

The way you transmit the ROHC packets on your network is up to you. It
depends of your network and your use case. In general, you will transmit
the ROHC packets above the link layer. On an Ethernet network, you might
transmit them as payload of Ethernet frames. On a PPP link, you might
want to transmit ROHC packets in PPP frames. In a satellite network, you
might want to transmit then in ATM, MPE, ULE, GSE... frames.

If you want to transmit ROHC packets over the Internet, you need a way
to tunnel the ROHC packets. IP hosts and routers won't understand the
ROHC headers so they can not handle ROHC traffic directly. You can use
an IP-IP, GRE, or even IP-UDP tunnel. The ROHC over UDP tunnel [1]
performs the third option. The IP/ROHC tunnel [2] performs the 1st
option.

Regards,
Didier

[1] http://rohc-lib.org/wiki/doku.php#rohc_over_udp_tunnel
[2] http://rohc-lib.org/wiki/doku.php#ip_rohc_tunnel

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