Suddenly Unable to Obtain IP via DHCP

I have an Ubuntu Server 14.04 installation. It has been ruing fine for 3 weeks. It is set up as a VM using QEMU (specifically on a QNAP NAS).

On Friday evening I installed LAMP using:

Code:

sudo apt-get install lamp-server^

There were no problems. I set up a database. The next moing I installed RoundCube from a tarball (just unpacked into /var/www/html) and configured it and was able to access it without issue over HTTP.

Later that day my problem started. I first noticed my e-mail client could not coect to the mail server and that I could no longer load RoundCube. I logged in and the MOTD was updated from a few hours before with some updates being available.

I tried:

Code:

ip addr

...
2: eth0 <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:57:10:64 brd ff:ff:ff:ff:ff:ff
    inet6 fe80:5054:ff:fe57:1064/64 scope link
       valid_lft forever preferred_lft forever

I tried:

Code:

sudo dhclient -v eth0

Inteet Systems Consortium DHCP Client 4.2.4
...

Listening on LPF/eth0/52:54:00:57:10:64
Sending on   LPF/eth0/52:54:00:57:10:64
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0x685e9559)
... (DHCPDISCOVER repeats 26 more time with different intervals)
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

On boot it hangs for a bit and eventually says:

Code:

Waiting for network configuration...
Waiting up to 60 more seconds for network configuration...
Booting system without full network configuration...

Troubleshooting I tried was to restart Ubuntu. Restart the NAS which is ruing QEMU. Reboot the router. None of those things made a difference. This moing I created a new Ubuntu VM and it obtained an IP no problem during install and has one now. I can take that eth0 up and down and it gets a DHCP lease no issue like the other did before. So it does seem to be a problem specific to this instance not a broader issue.

Here are some common items requested by helpful forum members:

ifconfig

Code:

eth0      Link encap:Etheet  HWaddr 52:54:00:57:10:64
          inet6 addr: fe80::5054:ff:fe57:1064/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:215 errors:0 dropped:0 overruns:0 frame:0
          TX packets:37 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:27680 (27.6 KB)  TX bytes:10062 (10.0 KB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:60 errors:0 dropped:0 overruns:0 frame:0
          TX packets:60 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:4244 (4.2 KB)  TX bytes:4244 (4.2 KB)

/etc/network/interfaces

Code:

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp

lshw -C network

Code:

*-network
       description: Etheet interface
       product: 82450EM Gigabit Etheet Controller
       vendor: Intel Corporation
       physical id: 3
       bus info: pci@0000:00:03.0
       logical name: eth0
       version: 03
       serial: 52:54:00:57:10:64
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: bus_master rom etheet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000 driverversion=7.3.21-k8-NAPI duplex=full latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:11 memory:feba0000-febbffff ioport:c000(size=64) memory:febc0000-febdffff

I can only guess something that was installed as part of the LAMP stack caused a problem, but I don't know what. I also am guessing everything seemed OK until the DHCP lease went to renew. Any help is greatly appreciated. Thanks!

برچسب: نویسنده: استخدام کار تاريخ: دوشنبه 23 فروردين 1395 ساعت: 1:19

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