Capwap Mailing List: RE: Question on LWAPP-03 draft

[Vishwas Manral (Vishwas]

Hi Puneet,

I think you mean all middleboxes and not just firewalls.

I guess for IPv6 it is already stated that we do not do fragmentation at LWAPP 
level because we have to do MTU discovery and hence fragments can be done at 
the application level itself. I think only if Path MTU discovery is done for 
IPv4 too, can we avoid fragmentation. 

Are you saying that the F, L and Fragment Id fields were only valid for Layer-2 
transport and not for Layer-3 transport earlier?

Thanks,
Vishwas
________________________________________
From: Puneet Agarwal [mailto:pagarwal [at] broadcom.com] 
Sent: Thursday, January 05, 2006 4:16 AM
To: Abhijit Choudhury; capwap [at] frascone.com
Subject: RE: [Capwap] Question on LWAPP-03 draft

The main issue is passing IP fragments via firewalls. Most firewalls drop 
fragmented packets (in fact the note is section 3.3.4 also refers to that). 
Hence the question.
 
Hope this helps.
 
Thanks.
 
-Puneet

________________________________________
From: Abhijit Choudhury [mailto:Abhijit [at] sinett.com] 
Sent: Wednesday, January 04, 2006 11:42 AM
To: Puneet Agarwal; capwap [at] frascone.com
Subject: RE: [Capwap] Question on LWAPP-03 draft
For L3 transport, as the spec says, only the first IP fragment
would have an LWAPP header. Standard IP reassembly is used to put the
fragments together.  F, L, and FragID fields in the LWAPP header
are not neeed for reassembly.
 
Am I missing something ?
 
Thanks,
   Abhijit
-----Original Message-----
From: Puneet Agarwal [mailto:pagarwal [at] broadcom.com] 
Sent: Tuesday, January 03, 2006 7:57 PM
To: capwap [at] frascone.com; Pat Calhoun (pacalhou)
Subject: [Capwap] Question on LWAPP-03 draft
Question of IPv4 frag/reassembly (Section 3.3.4):
 
There was some talk in the past about performing the fragmentation/reassembly 
at the application level to avoid IP fragments. In that case, the F,L and 
FragID bits would need to be used even for L3 transport. Did we ever reach a 
consensus on this one?
 
My recommendation would be to do the frag/reassembly at application level.
 
Thanks.
 
-Puneet