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Packet Processing Interface to Interface, Part 2: IP Header Check
Media length >= 20 bytes
Version = 4 (or 6)
Header length >= 5
Header length <= total length
Checksum validation
- Mandatory according to RFC1812, but many routers can be configured to skip this step!
If link layer address was broadcast, IP address must be broadcast or multicast
If link layer address was multicast, IP address must be multicast
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