华为手机包括荣耀dhcp服务器未分配给它IP，它竟然可以自动拿到上次用过的IP地址，为什么？

Question

wlan0: AP-STA-CONNECTED dc:16:b2:0c:8b:30
nl80211: Set STA flags - ifname=wlan0 addr=dc:16:b2:0c:8b:30 total_flags=0x61 flags_or=0x1 flags_and=0xffffffff authorized=1
wlan0: STA dc:16:b2:0c:8b:30 IEEE 802.1X: authorizing port
wlan0: STA dc:16:b2:0c:8b:30 RADIUS: starting accounting session B96669DA7100CF14
wlan0: STA dc:16:b2:0c:8b:30 WPA: pairwise key handshake completed (RSN)
/*----------------------------------------------------------------------------*
udhcpd无空闲IP,放弃offer；
*----------------------------------------------------------------------------/
udhcpd: no free IP addresses. OFFER abandoned
udhcpd: no free IP addresses. OFFER abandoned
udhcpd: no free IP addresses. OFFER abandoned
/*----------------------------------------------------------------------------*

Answer 1

dhcp服务器会记录下客户端的mac地址，并且再次分配的时候，会尽量选择之前的ip