Networking issues with Ubuntu 11.04 32 bit

[jbrownaf]

I recently installed Ubuntu 11.04 on my desktop and i am loving it. At the moment the only problem that i am having is that it won't connect to the network switch that i have hooked it up to.
The configuration is standard: cat5 cable from modem to switch and then cat5 from switch to computer. The switch is transferring information but the computer is not recognizing the connection. I keep going to the network tool in linux but it seems that nothing that i do is helping.

Is there anything that i can do to fix it and get it to recognize the internet connection coming from the switch?

[jbrownaf]

I think i'm just a lil retarded...I looked at the box and it says compatible with Mac and Windows....i don't think that it's compatible. Didn't know that was possible.

[jayd512]

Welcome to LinuxForums!

I looked at the box and it says compatible with Mac and Windows.

There are a lot of vendors out there that simply don't post Linux compatibility on their products, so I wouldn't jump to any conclusions just yet.
Are you connecting with a dynamic IP address (DHCP) or is this a static configuration?
Once booted up, and connections are made, open a terminal and run the following commands.

ifconfig

cat /etc/resolv.conf

Post back with the results.

[jbrownaf]

ok...got the info you requested...i'm not on my linux machine so i'm typing all of this back.

DHCP

eth0 Link encap: Ethernet HWaddr 00:21:85:9f:4d:82
inet6 addr: fe80::221:58ff:fe9f:4d82/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets: 46 errors:0 dropped:0 overruns:0 frame:0
TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3080 (3.0 KB) TX bytes:5732 (5.7 KB)
Interrupt: 43 Base address:0xc00

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: 16 errors:0 dropped:0 overruns:0 frame:0
TX packets: 16 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes: 960 (960.0 B) TX bytes:960 (960.0 B)

when i put in the "cat /etc/resolv.conf" it only says

# Generated by NetworkManager


any clues?

[jayd512]

Do this in a terminal:

sudo ifdown eth0
sudo ifup eth0

See if you have an IP address after that: ifconfig

[jbrownaf]

performed: sudo ifdown eth0
response: ifdown: interface eth0 not configured

performed: sudo ifup eth0
response: Ignoring unknown interface eth0=eth0

no ip afterward it's still 127.0.0.1

[jayd512]

In the top right hand corner of your screen, you should have the icon for Network Manager. Right-click on it, make sure that 'Enable Networking' is checked. If it is already checked, go to 'Edit Connections'. Edit your wired connection, make sure that it has the right info: DHCP, Available to all users, and set to connect automatically.

If none of that makes a difference, execute this in a terminal:

sudo lspci -kvnn

We just need the entry pertaining to the Ethernet controller.

lsmod

If possible, use a USB drive to transfer the file over to post from another computer.

[jbrownaf]

i saved it to a .txt file and gave you everything that came up...couldn't identify the line that you wanted...sry. I hope that you can find it.

The normal txt is the first command...after the third page it should get bold indicating the second command.linux troubleshooting.txt

[jayd512]

You had a slight typo in the command, but no worries, I see the line.
You're using an ethernet card with a Realtek chipset, and it's loading the forcedeth driver.
Did you double check the settings in Network Manager?

By the way, are you able to connect to the Internet when connecting directly to your modem?
And what type of switch are you using? Does it require a configuration file for each computer to connect? like something similar to MAC filtering or anything?

[jbrownaf]

I have rechecked all of the setting to the best of my abilites (windows knowledge) and everything looks good to me.

When i do hook it up directly to the modem there is no problem with the connection.

The switch does not require configuration file for each device connected. It is a Cisco: Linksys SE1500 switch link is below.