The ESP header is located after the IP header and before the transport mode protocol (UDP or TCP) or before an encapsulated IP header when using tunneling.
2
报道了一种新型塑料封装隧道结脉冲半导体激光器。
A new kind of pulse laser on tunnel junction with plastic package is reported.
Tunneling (RFC 2893) : it allows you to encapsulate one packet head into the other and one protocol will communicate with others through the encapsulation in the other protocol.