Flow-control

Flow-control use pause packet in full-duplex operation; back-pressure in half-duplex

/* pause packet */
00 00 00 00 00 02 00 00 00 00
00 01 88 08 00 01 03 E8 00 00
00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00

Reference:
[1]IEEE-802.3x
[2]http://www.pcdvd.com.tw/showthread.php?t=582735