Question

4

Cannot acquire DHCP address

rated 0 times [ 4] [ 0] / answers: 1 / hits: 48483 / 1 Year ago, sat, january 14, 2023, 2:33:18

I am unable to acquire a wired DHCP ip address.

I have Ubuntu 13.10 installed on a thin mini-itx ECS Q77H2-TI motherboard. I'm connecting to my cable modem which does provide ip addresses to other (windows, mac osx) machines I've connected to it.

When I run ifconfig I see:

eth1      Link encap:Ethernet  HWaddr 74:27:ea:c2:62:58          

          inet6 addr: fe80::7627:eaff:fec2:6258/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:267 errors:0 dropped:0 overruns:0 frame:0

          TX packets:516 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:50017 (50.0 KB)  TX bytes:111906 (111.9 KB)

          Interrupt:20 Memory:f7c00000-f7c20000 



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:1624 errors:0 dropped:0 overruns:0 frame:0          

          TX packets:1624 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0    

          RX bytes:132240 (132.2 KB)  TX bytes:132240 (132.2 KB)

cat /etc/network/interfaces gives:

auto lo

iface lo inet loopback

When I try tcpdump -i eth0 -n, I see nothing, but tcpdump -i eth1 -n, I see plenty of activity when wired.

I would love some pointers on how to get this machine connected to the internet.

Cheers,

Owen.

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answered 1 Year ago rowbris · Accepted Answer

Your pc view only eth1 interface. Ifconfig don't see eth0.
You can try with nm-tool command to see nic card, state ...
Simple output will be like this

$ nm-tool

NetworkManager Tool

State: connected

- Device: eth0  [Auto eth1] ----------------------------------------------------

 Type:              Wired

 Driver:            xxxxx

 State:             connected

 Default:           yes

 HW Address:        74:27:ea:c2:62:58

 Capabilities:

 Carrier Detect:  yes

 Speed:           100 Mb/s

 Wired Properties

 Carrier:         on

 IPv4 Settings:

 Address:         xxx.xxx.xxx.xxx

 Prefix:          24 (255.255.255.0)

 Gateway:         xxx.xxx.xxx.xxx

 DNS:             xxx.xxx.xxx.xxx

 DNS:             xxx.xxx.xxx.xxx

Also you can try to renew ip settings from dhcp server
first

ifconfig eth1 down

ifconfig eth1 up

or

dhclient eth1

You will probably get ip from dhcp ...

If is your cable in eth0 interface try to up interface

ifconfig eth0 up