rohc

ROHC Library and setup questions

Asked by Vikas Moothy

Hi All,

I am trying to figure out the working of the ROHC library here. I had a few basic questions after looking at rohctunnel tool:
1). Does the topology has to be in the same subnet like in rohctunnel tool is creating a 10.0.0.2 for example.
2). Can I have a router in between the two ROHC enabled systems?. How will the router understand the ROHC headers if IP headers are being replaced?

Thanks
Vikas

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Didier Barvaux
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Best Didier Barvaux (didier-barvaux) said : 		#1

Hello,

> 1). Does the topology has to be in the same subnet like in rohctunnel
> tool is creating a 10.0.0.2 for example.

There is no such requirement. You may choose whatever IP addresses
you want. If you choose IP addresses that are not in the same subnet,
you must take care to set the corresponding IP routes on each endpoint.

> 2). Can I have a router in between the two ROHC enabled systems?.
> How will the router understand the ROHC headers if IP headers are
> being replaced?

You can have a IP router between two ROHC enabled systems if you use
the ROHC tunnel tool. This is possible because the tunnel tool uses UDP as
a link layer for the ROHC packets.

Regards,
Didier

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Vikas Moothy (vikasmn84) said : 		#2

Thank you so much.

Vikas