User's Manual

Unified Services Router User Manual
63
Figure 37: 6 to 4 tunneling
3.5.7 ISATAP Tunnels
Advanced > IPv6 > 6to4 Tunneling
ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) is an IPv6
transition mechanism meant to transmit IPv6 packets between dual-stack
nodes on top of an IPv4 network. ISATAP specifies an IPv6-IPv4
compatibility address format as well as a means for site border router
discovery. ISATAP also specifies the operation of IPv6 over a specific
link layer - that being IPv4 used as a link layer for IPv6.