Hi Ramya, > Thanks Didier, > That was wonderful piece of information :) It > helped me a lot in understanding the concepts.
I'm glad to hear it :) If you got another question, do not hesitate. Regards, Didier Barvaux > On Sat, May 15, 2010 at 4:25 PM, Didier Barvaux <[email protected]> > wrote: > > > Hello Ramya, > > > > > Thanks,I got the output > > > I could execute it succesfully using the ping application after > > > which i got the output that has been attached. > > > > Congratulation! You just compressed your first packets with the ROHC > > library :) > > > > > > > In the last line of the output,it gives the size of the ROHC > > > Packet,feedback,compressed header size and payload size,. > > > I sent a packet with size 56 to which 8 bytes of header is > > > added..In the output statistics the payload > > > is being printed as 64 and the ROHC size is being printed as the > > > payload plus the compressed header size.. > > > Is this right? > > > > According to the screenshot you sent, you compressed a 84-byte > > ICMPv4 packet. See the trace "[rohc_comp.c:175 rohc_compress()] > > size of IP packet = 84 bytes". > > > > Your 84-byte ICMPv4 packet is composed of a 20-byte IPv4 header, an > > 8-byte ICMPv4 header and 56 bytes of ICMPv4 payload. The ROHC > > library compresses the IPv4 header but not the ICMPv4 header and > > the ICMPv4 payload. > > > > In the case of the last packet that I see on your screenshot (this > > is the packet #164), the resulting ROHC packet is 67-byte long. It > > is made of a 3-byte ROHC header (ie. the compressed equivalent of > > the 20-byte uncompressed IPv4 header) and a 64-byte ROHC payload > > (ie. the 8-byte ICMPv4 header and the 56-byte ICMPv4 payload > > unchanged). See the trace "[rohc_comp.c:362 rohc_compress()] ROHC > > size = 67 (feedback = 0, header = 3, payload = 64), output buffer = > > 5120" in the screenshot. > > > > ROHC compression with the last packet results in a 85% gain for > > header (20 bytes -> 3 bytes) and 20% gain for header+payload (84 > > bytes -> 67 bytes). > > > > I updated FAQ #639 "How to easily test the ROHC library ?" > > (https://answers.launchpad.net/rohc/+faq/639) to explain the > > rohctunnel traces the same way I did in this email. Let me know if > > the explanations are sufficient. > > > > Regards, > > Didier Barvaux > > > > _______________________________________________ > > Mailing list: https://launchpad.net/~rohc > > <https://launchpad.net/%7Erohc> Post to : > > [email protected] Unsubscribe : https://launchpad.net/~rohc > > <https://launchpad.net/%7Erohc> More help : > > https://help.launchpad.net/ListHelp > > > >
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