I have installed 12.04 into a used HP Compaq DC 7100 CMT. Plugged in LAN cable into the computer and it says network disconnected. from what I understand on the things I've read, it's not getting the address right, maybe it's just a guess (hardware address 00:16:35:78:47:bb).

I know the LAN cable is working I can get on the net with the old computer. (Old computer is using device MAC address; Auto eth0 00:11:11:E6:4F:FE).

I have put this address into the newer HP and it shows last used (minutes ago) but no Internet sever not found. I tried the hardware address it says never.

I feel and think this should be easy to fix. But I just don't know.

Here is the info everyone has asked for, but they never say what I should do.

sudo lshw -C network; rfkill list; cat /etc/network/interfaces; cat /etc/lsb-release; lspci -nn; lsusb; uname -a;
ifconfig; route -n

*-network
               description: ethernet interface
               product; NetXtreme BCM5751 Gigabit Ethernet PCI Express
               vendor: Broadcom Corporation
               physical id: 0
               bus info: pci@0000:40:00.0
               logical name: eth0
              verson: 01
              serial: 00:16:35:78:47:bb
              size: 100Mbit/s
              capacity: 1Gbit/s
              width: 64 bits
              clock: 33MHz
              capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical
tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000-fd
              configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=
3.121 duplex=full firmware=5751-v3.29a latency=0 link=yes multicast=yes port=twi
sted pair speed=100Mbit/s
             resources: irq:17 memory:f0400000-f040ffff
auto lo
iface lo inet loopback

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION= "Ubuntu 12.04 LTS"
00:00.0 host bridge [0600]: Inter Corporation 82915G/P/GV/GL/PL/910GL Memory Con
troller Hub [8086:2580] (rev 04)
00.02.0 VGA compatible controller [0300]: Intel Corporation 82915G/GV/910GL inte
grated Graphics Controller [8086:2582] (rev 04)
00:1c.0 PCI bridge [0604]: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family)
 PCI Express Port 1 [8086:2660] (rev 03)
00:1c.1 PCI bridge [0604]: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family)
 PCI Express Port 2 [8086:2662] (rev 03)
00:1d.0 USB controller [0c03]: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Fam
ily) USB UHCI #1 [8086:2658] (rev 03)
00:1d.1 USB controller [0c03]: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Fam
ily) USB UHCI #2 [8086:2659] (rev 03)
00:1d.2 USB controller [0c03]: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Fam
ily) USB UHCI #3 [8086:265a] (rev 03)
00:1d.3 USB controller [0c03]: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Fam
ily) USB UHCI #4 [8086:265b] (rev 03)
00:1d.7 USB controller [0c03]: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Fam
ily) USB2 UHCI Controller [8086:265c] (rev 03)
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 PCI bridge [8086:244e] (rev d
3)
00:1e.2 Multimedia audio controller [0401]: Intel Corporation 82801FB/FBM/FR/FW/
FRW (ICH6 Family) AC'97 Autio conrtroller [8086:266e] (rev 03)
00:1f.0 ISA bridge [0601]: Intel Corporation 82801FB/RF (ICH6/ICH6R) LPC Interfa
ce Bridge [8086:2640] (rev 03)
00:1f.1 IDE interface [0101]: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 fami
ly) IDE Controller [8086:266f] (rev 03)
00:1f.2 IDE interface [0101]: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA Con
troller [8086:2651] (rev 03)
40:00.0 Ethernet controller [0200]: Broadcom Corporation NetXreme BCM5751 Gigab
it Ethernet PCI Express [14e4:1677} (rev 01)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Linux bob-desktop 3.2.0-23-generic-pae #36-Ubuntu SMP Tpr 10 22:19:09 UTC 20
12 i686 i686 i386 GNU/Linux
eth0 Link encap:Ethernet HWaddr 00:16:35:78:47:bb
                    inet6 addr: fe80::216:35ff:47bb/64 Scope:link
                    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
                    RX packets:2517 errors:0 dropped:0 overruns:0 frame:0
                    TX packets:164 errors:0 dropped:0 overruns:0 carrier:0
                    collisions:0 txqueuelen:1000
                   RX bytes:164508 (164.5 KB) TX bytes: 40884 (40.0 KB)
                   Interrupt:17

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:16436 Metric:1
                   RX packets:3290 errors:0 dropped:0 overruns:0 frame:0
                   TX packets:3290 errors:0 dropped:0 overruns:0 carrier:0
                   collisions:0 txqueuelen: 0
                   RX bytes:267212 (267.2 KB) TX bytes: 267212 (267.2 KB)

Kernel Ip routing table
Destination Gateway Genmask Flags Metric Ref Use Iface

ran this
  sudo dhclient eth0
  no reply

ran this
  ip addr

1: lo <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
       link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
       inet 127.0.0.1/8 scope host lo
       inet6 ::1/128 scope host
            valid_lft forever preferred_lft forever
2: eth0: <BROADCAST ,MULTICAST ,UP ,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
       link/enter 00:16:35:78:47:BB brd ff:ff:ff:ff:ff:ff
       inet 169.254.7.172/16 brd 169.254.255.255 scope link eth0:avahi
       inet6 fe80::216:35ff:fe78:47bb/64 scope link
             valid_lft forever preferred_lft forever

Help please.