Therefore, ISATAP hosts must be configured with a potential routers list (PRL). However, the lack of multicast support prevents the use of automatic Router Discovery. As the link layer address, the IPv4 address, is contained in the lower-order 32-bits of the IPv6 address, Neighbor Discovery is not really needed. That is why ISATAP is a bit more complex than 6over4.įrom the viewpoint of the IPv6 packet, the link layer is the IPv4 packet. Neighbor Discovery īecause ISATAP uses IPv4 as a non multicast/broadcast-capable (unlike Ethernet) link layer, ICMPv6 Neighbor Discovery cannot be done in the usual manner. The link-local address is determined by prepending fe80 ::0200:5efe:… for globally unique addresses, or fe80::0000:5efe:… for private addresses, in front of the 32 bits of the host's IPv4 address.įor example, the global IPv4 address 192.0.2.143 would use fe80::0200:5efe:192.0.2.143 as its link-local IPv6 address. ISATAP defines a method for generating a link-local IPv6 address from an IPv4 address, and a mechanism to perform Neighbor Discovery on top of IPv4.Īny host wishing to participate in ISATAP over a given IPv4 network can set up a virtual IPv6 network interface.
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February 2023
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