> -----Original Message-----
> > From: ext Sri Gundavelli [mailto:sgundave at cisco.com]
> > Sent: 07 April, 2008 07:12
> > To: 'Hesham Soliman'
> > Cc: mext at ietf.org; Eronen Pasi (Nokia-NRC/Helsinki)
> > Subject: RE: [MEXT] TLV header in DSMIP
> >
> > 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
> >