ICMPv6 and ICMPv4

• Cleaned up ICMPv4.

  • Timestamp, source quench, and information request and reply were deleted (picked up by other protocols)

• Eliminated unused codes and types.

• IGMP is moved into ICMPv6.

  • ICMPv6 is not compatible with ICMPv4; however, it is the same format

• ICMPv6 does copy more of the offending datagram when sending an error message.

• Error messages have types from 0 - 127 and informational messages have types from 128 - 255.

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