A difference of opinion

Princess Nell · l33t Joined: 15 Apr 2005 Posts: 830

Problem: ethernet connection works at home, but not in the office. NM will not establish a connection, but I think this is only a symptom, NM is not the problem. Not sure when this started, could have been kernel 5.x, or a switch upgrade in the office.

This is a ThinkPad X260 with

Banana · l33t Joined: 21 May 2004 Posts: 748 Location: Germany

so the main difference is a different cable? Does work use a different network config? If so, how do you switch?
Do you shut down your device or just suspend, reconnect and expect it to work?
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Princess Nell · l33t Joined: 15 Apr 2005 Posts: 830

I turn the device on and expect it work

I might test a different cable. Don't think it's a factor since everything works when I configure the interface manually. Wireless also works fine and as expected, so I'm assuming the underlying network is sound, as is the dhcp server.

Yes, a different network config works (different vlan), and that involves a different cable, but also a different access switch.

Banana · l33t Joined: 21 May 2004 Posts: 748 Location: Germany

So no hibernate and stuff? Since this is often a source of problems with network connections.

Switching a network with different settings just b unplugging the cable should only work if you restart your connection settings. Otherwise the connection will use the current loaded one which my be not the required settings fpr the new network you are trying to connect to.
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AlexJGreen · Tux's lil' helper Joined: 19 Sep 2018 Posts: 149

Princess Nell · l33t Joined: 15 Apr 2005 Posts: 830

Different cable, different port, same problem.

This did coincide with the installation of a new access switch in the office. And no other box has this problem. I've been setting up several laptops with a well-known Enterprise distribution, all ThinkPads (but other models), and they all work fine.

CaptainBlood · Veteran Joined: 24 Jan 2010 Posts: 1998

Just my 2c:
Can you test alternate working computer from the company on the very same net plug that fails?
Could it be IPV6 issue?
Thls 4 ur attention, interest, & support.

Princess Nell · l33t Joined: 15 Apr 2005 Posts: 830

Yes, I have tried other ThinkPads with CentOS 7/8 on the same cable/port, and they all work.

I think I'll mothball that gentoo setup altogether and switch fully to CentOS in the office. There are things that I just can't get to work in a satisfactory manner, and they're fine on CentOS. This is the general area of "firefox+sound", and my refusal of switching to PA (no choice but to accept it on CentOS).