Clarrification needed regarding Multiple IP levels handling in IP Profile.

"narendranv" <narendranv@xxxxxxxxxxxxxxx> · Mon, 6 Apr 2009 15:22:45 +0530

Dear RoHCers,

I need clarrification 
regarding handling of Multiple IP Levels in Profile 
-0x0004.   

Let us 
assume 3 level IP as Input IP 
Packet:

Outermost 
Ip        Outer IP 
level            
Innermost IP level

RFC3843 says : Sec3.2. Handling Multiple Levels of IP 
Headers:

"   
The IP-only profile defined in this document goes one step 
further

and supports compression of an arbitrary number of IP levels.  This

is achieved by adding a dynamic chain to the general format 
of

compressed headers, to include the header part of each IP level 
in

excess of the first two."

 "   
For compressed headers, the information related to the initial two 
IP

headers is carried as for the IP/UDP profile, and a chain of 
dynamic

header information is added to the end of the compressed header 
for

each and every additional IP header.  "

Q.1) 
Which IP level should be considered as Additional IP Level in Profile- 
0x004.
     Is "IP1" considered as 
Additional level or "IP3" should be considered as Additional 

     level for 
Implementation?

Q.2) 
Is this interpretation correct?

     IP2 and IP3 levels are 
compressed and respective fileds are filled in the compressed header 

     and IP1 is added as additonal 
dynamic chain at 
the end of general format of compressed 
header.

Pls 
share your valuable opinions on the same.

Thanks & 
Regards,
Narendran. 

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