Sometimes I need to setup my android phone as hotspot. Then I'm trying to
connect from laptop with openSUSE Leap 42.2 (plasma 5 desktop, nm enabled) to
this hotspot. However it's not possible due to dhclient time out.

Apr 03 22:37:37 vostro NetworkManager[910]: <info>  (wlan0): Activation:
starting connection 'Mi4c' (970bd06b-5f6c-49b6-bc70-7ddd46f9c180)
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  (wlan0): device state
change: disconnected -> prepare (reason 'none') [30 40 0]
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  NetworkManager state is now
CONNECTING
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  (wlan0): device state
change: prepare -> config (reason 'none') [40 50 0]
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  (wlan0): Activation: (wifi)
connection 'Mi4c' requires no security.  No secrets needed.
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  Config: added 'ssid' value
'Mi4c'
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  Config: added 'scan_ssid'
value '1'
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  Config: added 'key_mgmt'
value 'NONE'
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  Config: set interface
ap_scan to 1
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  (wlan0): supplicant
interface state: inactive -> scanning
Apr 03 22:37:37 vostro kernel: wlan0: authenticate with 20:82:c0:70:57:c4
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  (wlan0): supplicant
interface state: scanning -> authenticating
Apr 03 22:37:37 vostro kernel: wlan0: send auth to 20:82:c0:70:57:c4 (try 1/3)
Apr 03 22:37:37 vostro kernel: wlan0: send auth to 20:82:c0:70:57:c4 (try 2/3)
Apr 03 22:37:37 vostro kernel: wlan0: authenticated
Apr 03 22:37:37 vostro kernel: wlan0: associate with 20:82:c0:70:57:c4 (try
1/3)
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  (wlan0): supplicant
interface state: authenticating -> associating
Apr 03 22:37:37 vostro kernel: wlan0: RX AssocResp from 20:82:c0:70:57:c4
(capab=0x421 status=0 aid=18)
Apr 03 22:37:37 vostro kernel: wlan0: associated
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  (wlan0): supplicant
interface state: associating -> completed
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  (wlan0): Activation: (wifi)
Stage 2 of 5 (Device Configure) successful.  Connected to wireless network
'Mi4c'.
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  (wlan0): device state
change: config -> ip-config (reason 'none') [50 70 0]
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  Activation (wlan0)
Beginning DHCPv4 transaction (timeout in 45 seconds)
Apr 03 22:37:37 vostro NetworkManager[910]: <info>  dhclient started with pid
2282
Apr 03 22:37:37 vostro NetworkManager[910]: <warn>  Unable to detect kernel
support for extended IFA_FLAGS. Assume no kernel support.
Apr 03 22:37:37 vostro NetworkManager[910]: <warn>  libnl and the kernel do not
support extended IFA_FLAGS needed by NM for IPv6 private addresses. This
feature is not 
Apr 03 22:37:39 vostro avahi-daemon[822]: Joining mDNS multicast group on
interface wlan0.IPv6 with address fe80::ae72:89ff:fe3e:71e6.
Apr 03 22:37:39 vostro avahi-daemon[822]: New relevant interface wlan0.IPv6 for
mDNS.
Apr 03 22:37:39 vostro avahi-daemon[822]: Registering new address record for
fe80::ae72:89ff:fe3e:71e6 on wlan0.*.
Apr 03 22:38:23 vostro NetworkManager[910]: <warn>  (wlan0): DHCPv4 request
timed out.
Apr 03 22:38:23 vostro NetworkManager[910]: <info>  (wlan0): DHCPv4 state
changed unknown -> timeout
Apr 03 22:38:23 vostro NetworkManager[910]: <info>  (wlan0): canceled DHCP
transaction, DHCP client pid 2282
Apr 03 22:38:23 vostro NetworkManager[910]: <info>  (wlan0): DHCPv4 state
changed timeout -> done
Apr 03 22:38:23 vostro NetworkManager[910]: <info>  (wlan0): device state
change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5]
Apr 03 22:38:23 vostro NetworkManager[910]: <info>  NetworkManager state is now
DISCONNECTED


I tried to track it down and it seems that issue is with /etc/dhclient.conf.
When I remove it (to allow dhcp client use default values) then I'm able to
connect to my android hotspot. I used wireshark to capture network packets. I'm
attaching to files:
* dhclient-fail.pcap.gz - captured when original /etc/dhclient.conf is
available
* dhclient-success.pcap.gz - captured when there is no /etc/dhclient.conf file

Is there any incorrect/outdated option in /etc/dhclient.conf which blocks
dhclient from receiving IP address?