July 2002
Beginner
360 pages
11h 19m
English
Content preview from IPv6 Essentials
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Protocol Translation (Chapter 10, RFC 2765)
Table B-13 shows how IPv4 header fields are translated to IPv6 header fields.
Table B-13. Translated IPv6 header fields
|
Header field |
Information |
|---|---|
|
Version |
6 |
|
Traffic Class |
All 8 bits from the Type of Service and Precedence Field are copied. |
|
Flow Label |
Zero |
|
Payload Length |
The Total Length from the IPv4 header field minus the size of the IPv4 header (including options, if present). |
|
Next Header |
Protocol Field copied from IPv4 header. |
|
Hop Limit |
TTL value copied from IPv4 header. Since the translator is a router, the value has to be decremented by one (either before or after translation) and the value checked. If zero, an ICMP TTL exceeded message has to be generated. |
|
Source Address |
Combination of IPv4-mapped address prefix and the IPv4 address in the
32 low-order bits, for example:
|
|
Destination Address |
Combination of IPv4-translatable address prefix and the IPv4
destination address, for example:
|
|
IPv4 Options |
If any IPv4 options are present, they are ignored. If a source route option is present, the packet must be discarded and an ICMPv4 “destination unreachable/source route failed” (Type3, Code 5) error message should be returned to the sender. |
Table B-14 shows the header fields when a translated packet needs to be fragmented.
Table B-14. IPv6 header fields with fragmentation
|
Header field |
Information |
|---|---|
|
Header fields | |
|
Payload Length |
The Total Length from the IPv4 ... |
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