RADIUS attribute from rfc6572
PMIP6-Visited-IPv4-HoA
When both the MAG and the LMA are in the visited network, the PMIP6-
Visited-IPv4-HoA attribute (Type value 156) is of type Address and is
used to exchange information between the VAAA and the MAG on the
assignment of the IPv4 Home Address to the MN being present in the
visited network.
The PMIP6-Visited-IPv4-HoA is also used on the LMA-to-VAAA interface.
If the LMA delegates the assignment of the IPv4-HoA to the VAAA, the
attribute MUST contain an address of all zeroes (i.e., 0.0.0.0) in
the RADIUS Access-Request message. The Access-Accept message MUST
have the attribute present if the prior request to the VAAA already
included one.
The attribute SHOULD NOT be included if the use of the LMA in the
home network is authorized (the PMIP6-Home-IPv4-HoA and/or PMIP6-
Home-LMA-IPv4-Address attributes are already present). However, if
the VAAA local policy allows both home and visited LMA addresses to
be delivered to the MAG, then this attribute MAY also be included.0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Reserved |Prefix-Len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Visited IPv4 HoA |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type:
PMIP6-Visited-IPv4-HoA 156.
Length:
= 8 octets
Reserved:
The 10-bit field reserved for future use. The value MUST be
initialized to zero by the sender and MUST be ignored by the
receiver.
Prefix-Len:
6-bit unsigned integer indicating the prefix length of the IPv4
HoA. If the Visited IPv4 HoA contains an address of all zeroes
(i.e., '0.0.0.0'), then the Prefix-Len MUST be set to 32.
Visited IPv4 HoA:
This field is of type Address and contains the IPv4 home address
of the MN in the visited network.