RE: 3gpp-analysis-04: Transition mechanisms at UEs; 3GPP IPv6 dep loyment

["Karim El-Malki (HF/EAB)" <karim.el-malki@ericsson.com>]

 > On Thu, 24 Jul 2003, Karim El-Malki (HF/EAB) wrote:
 > > You're assuming that roaming is done at L3. Roaming is normally
 > > done at L2 so for example ISATAP is a relevant option.
 > 
 > (I think you should elaborate on "normally")

According to the 3gpp standard.

 > 
 > OK.  If roaming is done at L2, then IP addresses etc. should 
 > stay the same
 > when you roam, right?  Then IPv6 addresses will stay too, 
 > right?  So, why
 > do you need ISATAP there then?

Imagine a situation in which you're roaming to another
operator's network. The roaming user requests v6 connectivity
(PDP Context) in the new network. If the new network doesn't
support it, the roaming user won't get v6 connectivity.
The PDP Context is a special L2 as described in RFC 3314.

/Karim