user1@debian:~$ ping ya.ru
ping: unknown host ya.ru
user1@debian:~$ ping 192.168.11.1
PING 192.168.11.1 (192.168.11.1) 56(84) bytes of data.
From 192.168.11.14 icmp_seq=1 Destination Host Unreachable
From 192.168.11.14 icmp_seq=2 Destination Host Unreachable
From 192.168.11.14 icmp_seq=3 Destination Host Unreachable
From 192.168.11.14 icmp_seq=4 Destination Host Unreachable
From 192.168.11.14 icmp_seq=5 Destination Host Unreachable
From 192.168.11.14 icmp_seq=6 Destination Host Unreachable
^C
--- 192.168.11.1 ping statistics ---
9 packets transmitted, 0 received, +6 errors, 100% packet loss, time 8018ms pipe 3
user1@debian:~$ sudo ifdown wlan0
Killed old client process
Internet Systems Consortium DHCP Client 4.3.1
Copyright 2004-2014 Internet Systems Consortium.
All rights reserved.
For info, please visit
https://www.isc.org/software/dhcp/Listening on LPF/wlan0/5D:BA:2D:BC:20:1E
Sending on LPF/wlan0/5D:BA:2D:BC:20:1E
Sending on Socket/fallback
DHCPRELEASE on wlan0 to 192.168.11.1 port 67
user1@debian:~$ sudo ifup wlan0
Internet Systems Consortium DHCP Client 4.3.1
Copyright 2004-2014 Internet Systems Consortium.
All rights reserved.
For info, please visit
https://www.isc.org/software/dhcp/Listening on LPF/wlan0/5D:BA:2D:BC:20:1E
Sending on LPF/wlan0/5D:BA:2D:BC:20:1E
Sending on Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 14
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 13
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
user1@debian:~$
user1@debian:~$ ping 192.168.11.1
connect: Network is unreachable
user1@debian:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 08:00:27:71:91:c7 brd ff:ff:ff:ff:ff:ff
inet 192.168.10.102/24 brd 192.168.10.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::a00:27ff:fe71:91c7/64 scope link
valid_lft forever preferred_lft forever
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether 5D:BA:2D:BC:20:1E brd ff:ff:ff:ff:ff:ff
user1@debian:~$ sudo iwlist wlan0 scan
wlan0 No scan results