wifi enabling problem

[asadullah4571]

hi 
i successfully connecting wifi on STM32mp157f-DK2 board through IPhone but the when i pass the command 

"# ping google.com " then it show temporary failure  in name resolution ,  and also dhcp command not found why this is happen. please reach me out As soon as possible

[asadullah4571]

root@stm32mp1:~# iw dev wlan0 scan |grep SSID

SSID: Betrust

SSID: 

SSID: Airtel_mani_0680

SSID: MohiT_PIPPAL

* Multiple BSSID

* SSID List

SSID: 4ThFloor

SSID: iPhone

root@stm32mp1:~# iw dev wlan0 scan |grep SSID

SSID: EDS-INDIA\x20

SSID: Betrust

SSID: 

SSID: Airtel_mani_0680

SSID: iPhone

root@stm32mp1:~# [  498.021705] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready

root@stm32mp1:~# ifconfig wlan0

wlan0     Link encap:Ethernet  HWaddr 48:EB:62:BD:88:76  

          inet addr:192.168.73.80  Bcast:192.168.73.255  Mask:255.255.255.0

          inet6 addr: fe80::4aeb:62ff:febd:8876/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:94 errors:0 dropped:0 overruns:0 frame:0

          TX packets:131 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:10538 (10.2 KiB)  TX bytes:14806 (14.4 KiB)

root@stm32mp1:~# ping google.com

ping: google.com: Temporary failure in name resolution

root@stm32mp1:~# iw wlan0 link

Connected to 06:a3:1e:5a:96:de (on wlan0)

SSID: Shubham

freq: 2432

RX: 37506 bytes (271 packets)

TX: 31089 bytes (308 packets)

signal: -32 dBm

rx bitrate: 1.0 MBit/s

tx bitrate: 24.0 MBit/s

bss flags: short-slot-time

dtim period: 2

beacon int: 100

root@stm32mp1:~# ping google.com

ping: google.com: Temporary failure in name resolution

root@stm32mp1:~# ping google.com

ping: google.com: Temporary failure in name resolution

root@stm32mp1:~# iw wlan0 link

Not connected.

root@stm32mp1:~# iw wlan0 link

Not connected.

root@stm32mp1:~# iw wlan0 link

Not connected.

root@stm32mp1:~# ifconfig wlan0 down

root@stm32mp1:~# ifconfig wlan0 down

root@stm32mp1:~# ifconfig wlan0 up

root@stm32mp1:~# [  761.074208] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready

root@stm32mp1:~# iw wlan0 link

Connected to 06:a3:1e:5a:96:de (on wlan0)

SSID: Shubham

freq: 2432

RX: 9541 bytes (28 packets)

TX: 10767 bytes (70 packets)

signal: -29 dBm

rx bitrate: 26.0 MBit/s

tx bitrate: 65.0 MBit/s

bss flags: short-slot-time

dtim period: 2

beacon int: 100

root@stm32mp1:~# ping google.com

PING google.com(del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e)) 56 data bytes

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=1 ttl=57 time=28.3 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=1 ttl=57 time=31.5 ms (DUP!)

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=2 ttl=57 time=54.5 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=3 ttl=57 time=105 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=4 ttl=57 time=64.5 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=5 ttl=57 time=125 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=6 ttl=57 time=140 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=7 ttl=57 time=50.4 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=8 ttl=57 time=49.1 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=9 ttl=57 time=45.8 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=10 ttl=57 time=44.7 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=11 ttl=57 time=83.7 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=11 ttl=57 time=96.6 ms (DUP!)

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=12 ttl=57 time=57.0 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=13 ttl=57 time=52.6 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=14 ttl=57 time=121 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=15 ttl=57 time=37.0 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=16 ttl=57 time=46.8 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=17 ttl=57 time=119 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=18 ttl=57 time=58.0 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=19 ttl=57 time=55.3 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=20 ttl=57 time=55.7 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=20 ttl=57 time=179 ms (DUP!)

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=20 ttl=57 time=179 ms (DUP!)

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=21 ttl=57 time=51.6 ms

64 bytes from del03s16-in-x0e.1e100.net (2404:6800:4002:80b::200e): icmp_seq=22 ttl=57 time=78.7 ms

^C

--- google.com ping statistics ---

22 packets transmitted, 22 received, +4 duplicates, 0% packet loss, time 21029ms

rtt min/avg/max/mdev = 28.253/77.305/178.969/42.066 ms

root@stm32mp1:~# 

it working fine thanks .