Hi Ole,
Sec. 4.4 of draft-mdt-softwire-mapping-address-and-port-03 says:
"Default Mapping Rule:
{2001:db8:0001:0000:<interface-id>:/128 (Rule IPv6 prefix),
0.0.0.0/0 (Rule IPv4 prefix),
192.0.2.1 (BR IPv4 address)}
Example 3: Default Mapping Rule
In most implementations of a routing table, the next-hop address must be of the
same address family as the prefix. To satisfy this requirement a BR IPv4
address is included in the rule. Giving a default route in the IPv4 routing
table:
0.0.0.0 -> 192.0.2.1, MAP-Interface0"
I must admit I found this very confusing:
- It seems to be a purely internal matter, having therefore no place in a
proposed standard.
- In an internal IPv4 routing table, any never-assigned address seems
sufficient (no need for dependence on the BR IPv4 address).
- How a MAP-T CE could get the BR IPv4 address isn't specified (no DHCPv6
parameter specified for its transmission).
Thanks for explaining,
RD
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