ICMP Protocol Translation
ICMPv4 and ICMPv6 use same header (type, code, csum)
Most message types have an semantic equivalent
- translation involves static mapping of field values
Query message
- Echo Request and Echo Reply messages only
- rest are silently dropped: either obsolete or single-hop
- Error messages recursively translated
- Destination Unreachable
- Time Exceeded
- Parameter Problem (adjust pointer)
- Packet Too Big (adjust MTU)
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