6to4 and ISATAP

Similarities between 6to4 and ISATAP

  1. Both imbed IPv4 address in the IPv6 prefix
  2. Both do NOT support multicast
  3. Both tunnel IPv6 packet inside IPv4 packet, thus have header overhead
  4. Both use IPv4 as the transport to connect IPv6 networks

Differences between 6to4 and ISATAP

  1. ISATAP use DNS (isatap.domain) or Potential Router List (PRL) to find its ISTAP gateway. 6to4 uses an fixed anycast address of 192.88.99.1
  2. ISATAP was designed to tunnel IPv6 packet over IPv4 network within a site. 6to4 was designed to tunnel IPv6 networks over IPv4 networks among sites
  3. ISATAP can use Global Unique Address. 6to4 has to use 2002::/16 address
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