we have many APs controlled by cisco wlc 5520
We found some mobile phone roaming from one AP to another AP, DCHP problem
for example
when one mobile phone assotiate to one AP and obtain an IP adress A.A.A.A（from dhcp server running on catalyst 9400)
after this mobile phone move to another AP , we can find this mobile phone send DHCP request (source adress is 0.0.0.0,but option 50 request ip address is a new ip address B (not seen anywhere ,not seen another dhcp server assign this IP B），
DHCP server has old binding ip address A.A.A.A, so dhcp server send DHCP NAK to mobile phone, and release old bingding A.A.A.A
after while, mobile phone begin a new dhcp discover process , DHCP server a new IP C.C.C.C
I have found when this happened .mobile join another AP is 802.11 associate request (not reassociate), then dhcp request happened
Has any one saw this mobile phone weired DHCP request behavor?
why during associate another AP, mobile phone send a not seen new ip B.B.B.B dchp request ? you can see attach
I found dhcp debug on android phone same behavior
thank you
Tom
