пакетный интерфейс на уровне устройства (packet interface on device level)
Ошибки (баги) (Bugs)
The IEEE 802.2/803.3 LLC handling could be considered as a bug.
Socket filters are not documented.
The MSG_TRUNC recvmsg
(2) extension is an ugly hack and should be
replaced by a control message. There is currently no way to get
the original destination address of packets via SOCK_DGRAM
.