Re: [MEXT] TLV header in DSMIP

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

Hi Hesham,

Also, can you please clarify the operation for this
below scenarioe. We are updating our PMIP6 IPv4 document
and we are not clear how this scenario works, in liu of
the latest DSMIP6 resolutions. Some clarifications will
help.

When ESP is used only for control traffic and not for data
traffic, how does the NAT traversal scheme work ? The NAT
mappings for both the flows are different, howz the relation
maintained ?

My Assumption: IPv4 transport in use, NAT in path and
the resolution that the port 4500 is used for secure
ESP traffic and for non secure traffic DSMIP port is
used. 

Operation: 
===========
- MN sends MIP BU encapsulated in UDP to port 4500

- NAT binding is created on the NAT device, having a
  relation to src port of the BU, port 4500, IPv4-private-coa,
  IPv4-public-coa and HA-V4-Address
 
- HA creates a tunnel with UDP encap and with the above 
  properties (Src/Dest ports)

- If MN or HA needs to forward data traffic and unprotected,
  does it needs to be sent to port 4500 or DSMIP port ?
  We cannot send non-ESP traffic to port 4500.

- If this is sent to DSMIP port, what triggers the new NAT
  mapping and howz the tunnel encap header modified on the HA ?

- How do keepalives work ?

Appreciate your time on this.


Regards
Sri
  

 

> -----Original Message-----
> From: Hesham Soliman [mailto:hesham at elevatemobile.com] 
> Sent: Saturday, April 05, 2008 1:32 AM
> To: Sri Gundavelli
> Cc: mext at ietf.org; Pasi.Eronen at nokia.com
> Subject: Re: [MEXT] TLV header in DSMIP
> 
> >
> > I can provide the text, if there is agreement that we are using
> > DSMIP port and the TLV-ESP follows the UDP. I'm bit confused, on
> > what is the port number that is in use. 4500 or the DSMIP port ?
> 
> => I don't think we need the text now, there is agreement to remove  
> this.
> We're using 4500 for secure traffic and DSMIP port for other traffic.
> 
> Hesham
> 
> >
> >
> > Sri
> >
> >
> 

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