ipoib-1 Page:9
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Encapsulation
Connection can carry IPv4 or IPv6 or both packets. Therefore
Type of packet is known
Type of packet is distinguishable from the IP header

Two options:
IP packets directly encapsulated in the IB connection mode payload
IP packets encapsulated with the ‘Ethertype’ indication as in IPoIB-UD

Address resolution over UD QP needs to follow IPoIB-UD encapsulation
PPT Version