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Not getting dhcp ip address from isp

Asked by Tongayi Masunda

Hi

I am using precise desktop although I have had a similar issue with the 12.04 server. When I connect the nic using a bridge over my cpe I cannot get an ip address from the isp dhcp server. When I use the same desktop with windows I do get an ip address. Please assist me with possible causes for this behaviour so that I can resolve it.

Regards,

Tongayi

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actionparsnip (andrew-woodhead666) said : 		#1

If you run :

sudo dhclient eth0

Do you get an IP address?

What Ethernet controller chip are you using? Has this ever worked under this install or has it always been this way?

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Tongayi Masunda (tmasunda) said : 		#2

Hi actionparsnip

When I do a sudo dhclient all I get are dhcp discover messages going out but no traffic coming back in. I can see this from wireshark.

I am almost certain it has to do with autonegotiation because when I was using windows there were no problems getting ip address from dhcp. Please assist.

Regards,

Tongayi

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actionparsnip (andrew-woodhead666) said : 		#3

What is the output of:

sudo lshw -C network

Thanks

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Tongayi Masunda (tmasunda) said : 		#4

The output for sudo lshw -C network is:
  *-network
       description: Ethernet interface
       product: RTL-8139/8139C/8139C+
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 3
       bus info: pci@0000:02:03.0
       logical name: eth0
       version: 10
       serial: 00:16:17:a5:e3:20
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=off broadcast=yes driver=8139too driverversion=0.9.28 duplex=full latency=64 link=yes maxlatency=64 mingnt=32 multicast=yes port=MII speed=100Mbit/s
       resources: irq:23 ioport:de00(size=256) memory:fddff000-fddff0ff

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actionparsnip (andrew-woodhead666) said : 		#5

Try:

sudo modprobe -r 8139too; sleep 5; sudo modprobe 8139too

Thanks

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actionparsnip (andrew-woodhead666) said : 		#6

Also found this:
http://askubuntu.com/questions/132121/ethernet-connection-for-realtek-rtl8139-810x-not-working

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