Re: [MEXT] TLV header in DSMIP

["Sri Gundavelli" <sgundave at cisco.com>]

Question .. 

> -----Original Message-----
> From: mext-bounces at ietf.org [mailto:mext-bounces at ietf.org] On 
> Behalf Of Hesham Soliman
> Sent: Thursday, April 03, 2008 1:45 AM
> To: mext at ietf.org
> Subject: [MEXT] TLV header in DSMIP
> 
> Folks,
> 
> During one of the reviews for DSMIP the issue came up regarding the  
> TLV header Type field values and how the current spec doesn't 
> describe  
> how it can be used for IPsec.
> After looking into this a bit I don't see why we would need 
> IPsec for  
> this. We originally defined because people wanted to use GRE so the  
> format would be:
> IP
> UDP
> GRE
> IP
> ...etc
> 

I assume you mean ..

IP 
UDP
TLV-header
Other headers (GRE ..)


So, we assume 3948 scheme is in use and since ESP has the
semantics to identify the contained types ...

IPv4-UDP-ESP-GRE-(IPv4, IPv6) -- 3948 is in use, UDP port 4500.
IPv4-UDP-TLV-GRE-(IPv4, IPv6) -- DSMIP6 port.

This is ok.

Thanks
Sri




> It seems like it would be sufficient to only define this now for GRE  
> and if someone comes up with a need for using IP/IPsec 
> directly after  
> the TLV header they can define that behaviour and request a new type  
> value.
> 
> So the new draft would only allocate one value for GRE.
> 
> Any objections to this ? please respond quickly, we need to finish  
> this ASAP.
> 
> Thanks,
> Hesham
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