Requirements for IP Tunnels and IP Interfaces

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Each tunnel type has specific IP address requirements for the IP interface that you configure over the tunnel. These requirements are summarized in the following table.

Table 4-1 Tunnels and IP Interface Requirements

Tunnel Type	IP Interface Allowed Over Tunnel	IP Interface Requirement
IPv4 tunnel	IPv4 interface	Local and remote addresses are manually specified.
	IPv6 interface	Local and remote link-local addresses are automatically set when you issue the `ipadm create-addr -T addrconf` command. See the `ipadm` (1M) man page.
IPv6 tunnel	IPv4 interface	Local and remote addresses are manually specified.
	IPv6 interface	Local and remote link-local addresses are automatically set when you issue the `ipadm create-addr -T addrconf` command. See the `ipadm` (1M) man page.
6to4 tunnel	IPv6 interface only	Default IPv6 address is automatically selected when you issue the `ipadm create-ip` command. See the `ipadm` (1M) man page.

You can override the link-local addresses that are automatically set for IPv6 interfaces over IPv6 or IPv4 tunnels by specifying a local and remote interface-id with the ipadm create-addr -T addrconf command.