[CentOS] DHCP timeout and mysteriously dropping IP address

Jason Edgecombe

jwedgeco at uncc.edu
Tue Jan 2 17:14:38 UTC 2018


Hi everyone,

I'me having trouble with a CentOS 7 guest running on a Hyper-V host. For
some reason, the CentOS guest randomly drops its IP address. Running
"systemctl restart NetworkManager" on the console will restore IP
connectivity without a reboot. I think that DHCP is timing out, but I'm not
sure what to do about it. Is there a way to tell NetworkManager to keep
trying after a timeout?

Here are the versions of the kernel and NetworkManager:
Kernel: 3.10.0-693.11.1.el7.x86_64
NetworkManager: 1.8.0-11.el7_4.x86_64


Here are some pertinent logs:
Dec 23 03:30:26 myhost kernel: hv_utils: Using TimeSync version 3.0
Dec 23 03:30:27 myhost systemd: Time has been changed
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.3750]
device (eth0): link connected
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.3762]
device (eth0): DHCPv4 lease renewal requested
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.3889] dhcp4
(eth0): canceled DHCP transaction, DHCP client pid 7936
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.3890] dhcp4
(eth0): state changed bound -> done
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.3899] dhcp4
(eth0): activation: beginning transaction (timeout in 45 seconds)
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.4487] dhcp4
(eth0): dhclient started with pid 33165
Dec 23 03:30:33 myhost dhclient[33165]: DHCPREQUEST on eth0 to
255.255.255.255 port 67 (xid=0x5cb111f1)
Dec 23 03:30:33 myhost dhclient[33165]: DHCPACK from xxx.xxx.36.1
(xid=0x5cb111f1)
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.5824] dhcp4
(eth0):   address xxx.xxx.37.53
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.5825] dhcp4
(eth0):   plen 23 (255.255.254.0)
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.5826] dhcp4
(eth0):   gateway xxx.xxx.36.1
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.5826] dhcp4
(eth0):   lease time 7200
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.5826] dhcp4
(eth0):   nameserver 'xxx.xxx.0.20'
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.5826] dhcp4
(eth0):   nameserver 'xxx.xxx.0.30'
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.5826] dhcp4
(eth0):   domain name 'example.com'
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.5826] dhcp
(eth0):   domain search 'example.com.'
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.5827] dhcp
(eth0):   domain search 'foo.example.com.'
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.5827] dhcp
(eth0):   domain search 'dyn.example.com.'
Dec 23 03:30:33 myhost NetworkManager[788]: <info>  [1514017833.5827] dhcp4
(eth0): state changed unknown -> bound
Dec 23 03:30:33 myhost dhclient[33165]: bound to xxx.xxx.37.53 -- renewal
in 3368 seconds.
Dec 23 03:30:33 myhost dbus-daemon: dbus[726]: [system] Activating via
systemd: service name='org.freedesktop.nm_dispatcher'
unit='dbus-org.freedesktop.nm-dispatcher.service'
Dec 23 03:30:33 myhost dbus[726]: [system] Activating via systemd: service
name='org.freedesktop.nm_dispatcher'
unit='dbus-org.freedesktop.nm-dispatcher.service'
Dec 23 03:30:33 myhost systemd: Starting Network Manager Script Dispatcher
Service...
Dec 23 03:30:33 myhost dbus[726]: [system] Successfully activated service
'org.freedesktop.nm_dispatcher'
Dec 23 03:30:33 myhost dbus-daemon: dbus[726]: [system] Successfully
activated service 'org.freedesktop.nm_dispatcher'
Dec 23 03:30:33 myhost systemd: Started Network Manager Script Dispatcher
Service.
Dec 23 03:30:33 myhost nm-dispatcher: req:1 'dhcp4-change' [eth0]: new
request (4 scripts)
Dec 23 03:30:33 myhost nm-dispatcher: req:1 'dhcp4-change' [eth0]: start
running ordered scripts...
Dec 23 03:40:42 myhost kernel: hv_utils: Using TimeSync version 3.0
Dec 23 03:40:43 myhost systemd: Time has been changed
Dec 23 03:40:49 myhost NetworkManager[788]: <info>  [1514018449.4566]
device (eth0): link connected
Dec 23 03:40:49 myhost NetworkManager[788]: <info>  [1514018449.4583]
device (eth0): DHCPv4 lease renewal requested
Dec 23 03:40:49 myhost NetworkManager[788]: <info>  [1514018449.4693] dhcp4
(eth0): canceled DHCP transaction, DHCP client pid 33165
Dec 23 03:40:49 myhost NetworkManager[788]: <info>  [1514018449.4694] dhcp4
(eth0): state changed bound -> done
Dec 23 03:40:49 myhost NetworkManager[788]: <info>  [1514018449.4703] dhcp4
(eth0): activation: beginning transaction (timeout in 45 seconds)
Dec 23 03:40:49 myhost NetworkManager[788]: <info>  [1514018449.4781] dhcp4
(eth0): dhclient started with pid 33440
Dec 23 03:40:49 myhost dhclient[33440]: DHCPREQUEST on eth0 to
255.255.255.255 port 67 (xid=0x2f112c1)
Dec 23 03:40:52 myhost dhclient[33440]: DHCPREQUEST on eth0 to
255.255.255.255 port 67 (xid=0x2f112c1)
Dec 23 03:40:57 myhost dhclient[33440]: DHCPREQUEST on eth0 to
255.255.255.255 port 67 (xid=0x2f112c1)
Dec 23 03:41:02 myhost dhclient[33440]: DHCPDISCOVER on eth0 to
255.255.255.255 port 67 interval 6 (xid=0xe5feb70)
Dec 23 03:41:08 myhost dhclient[33440]: DHCPDISCOVER on eth0 to
255.255.255.255 port 67 interval 10 (xid=0xe5feb70)
Dec 23 03:41:18 myhost dhclient[33440]: DHCPDISCOVER on eth0 to
255.255.255.255 port 67 interval 12 (xid=0xe5feb70)
Dec 23 03:41:30 myhost dhclient[33440]: DHCPDISCOVER on eth0 to
255.255.255.255 port 67 interval 16 (xid=0xe5feb70)
Dec 23 03:41:34 myhost NetworkManager[788]: <warn>  [1514018494.9605] dhcp4
(eth0): request timed out
Dec 23 03:41:34 myhost NetworkManager[788]: <info>  [1514018494.9612] dhcp4
(eth0): state changed unknown -> timeout
Dec 23 03:41:34 myhost NetworkManager[788]: <info>  [1514018494.9713] dhcp4
(eth0): canceled DHCP transaction, DHCP client pid 33440
Dec 23 03:41:34 myhost NetworkManager[788]: <info>  [1514018494.9714] dhcp4
(eth0): state changed timeout -> done

Thanks,
Jason


---------------------------------------------------------------------------
Jason Edgecombe | Linux Administrator
UNC Charlotte | The William States Lee College of Engineering
9201 University City Blvd. | Charlotte, NC 28223-0001
Phone: 704-687-1943
jwedgeco at uncc.edu | http://engr.uncc.edu |  Facebook
---------------------------------------------------------------------------
If you are not the intended recipient of this transmission or a person
responsible for delivering it to the intended recipient, any disclosure,
copying, distribution, or other use of any of the information in this
transmission is strictly prohibited. If you have received this transmission
in error, please notify me immediately by reply e-mail or by telephone at
704-687-1943.  Thank you.



More information about the CentOS mailing list