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[indra <question253104@xxxxxxxxxxxxxxxxxxxxx>]

Question #253104 on rohc changed:
https://answers.launchpad.net/rohc/+question/253104

    Status: Answered => Open

indra is still having a problem:
Hi Didier,

Thank you very much for your response and explanation.

If we are going to send these compressed ROHC packets through tunnel(vpn) application. Do these tunnel applications doesn't add ip/udp headers for these packets ? 
Generally How tunnel applications send the packets to the remote static ip machines ? Any good document for this ?

Thanks in Advance.

Regards,
Indra.


> To: indra.gopireddy@xxxxxxxxx
> From: question253104@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [Question #253104]: Reg ROHC implementation in Linux , Android
> Date: Wed, 27 Aug 2014 10:21:59 +0000
> 
> Your question #253104 on rohc changed:
> https://answers.launchpad.net/rohc/+question/253104
> 
>     Status: Open => Answered
> 
> Didier Barvaux proposed the following answer:
> Hello,
> 
> > 1) Generally ubuntu kernel adds the udp, IP, ethernet headers to the
> > packet ? like we will use sendto(), receivefrom() APIs the the reamining
> > things like udp , IP Ethenet headers are added and parsed by the linux
> > kernel ? Hence where we will get the control to compress these
> > headers ? Is there any way we can specify to kernel don't add any these
> > kind of headers ?
> 
> Yes, the Linux kernel (Ubuntu uses the Linux kernel) is in charge of
> adding (resp. removing) the protocol headers when sending (resp.
> receiving) data over Ethernet/IP/UDP or Ethernet/IP/TCP.
> 
> You may bypass this by using RAW sockets to send or receive packets
> without adding/removing headers: see 'man 7 raw' or
> http://man.cx/raw%287%29
> 
> 
> > 2) If we suppose used this and compressed , how to send these IP compressed
> > packets to the remote machine (which is having static IP remotely)?
> 
> This is entirely up to your application. The ROHC protocol does not
> define how ROHC packets are transmitted to the remove node. For example,
> the IP/ROHC tunnel application transmits the ROHC packets encapsulated
> in IPv4 packets, see http://rohc-lib.org/wiki/doku.php?id=iprohc-
> overview
> 
> 
> Regards,
> Didier
> 
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