netdev - Re: Network interface "stops working"

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Date:   Tue, 23 Jan 2018 10:30:25 +0000
From:   Turbo Fredriksson <turbo@...our.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Network interface "stops working"

Not sure it’s a bug yet, but anyone have any ideas on how I can find out?

> On 22 Jan 2018, at 23:32, Cong Wang <xiyou.wangcong@...il.com> wrote:
> 
> (Please always Cc netdev for networking related bugs.)
> 
> On Mon, Jan 22, 2018 at 2:02 AM, Turbo Fredriksson <turbo@...our.com> wrote:
>> I just got a new broadband delivered at home. It is "Hyperoptic 1Gbps fiber" which comes as a ethernet connector at home. I wasn’t around
>> when they connected up everything, so I’m not sure *where* the fiber starts, but either way, I have an ethernet jack in one of my rooms.
>> 
>> They also provided me with a ZTE router. I have need for my own services (firewalling, NATing, IPSEC and what not), so don’t want to use
>> the provided router..
>> 
>> However, I’m having serious trouble keeping the interface up! Works for a few minutes and then just “stops working”. Don’t know why, there’s
>> nothing in the logs or from dmesg..
>> 
>> Taking the interface down and then up again usually solves it. For a few minutes.
>> 
>> Also, when running the interface (a Intel 82576 Gigabit dual port, using the igb driver - tried e1000 and e1000e but they don’t find any interfaces),
>> in 1Gbps mode, the interface starts flapping up and down and I can’t get a connection at all. So my interface definition runs a script to use
>> ethtool to set the speed to 100Mbps, full duplex, no auto negotiation. Which “kinda” works (for a while, hence my problems).
>> 
>> Because the provided router works just fine, I’m sure it’s something on my Linux box (Debian GNU/Linux Jessie) that does it.. I’ve tried running
>> it without any iptables, in both static and DHCP mode but same problem..
>> 
>> I’m not a complete beginner with Linux nor networks, but this is to “close to the hardware” for me. I’m at a loss to what else to try..
>> 
>> This isn’t a new machine, it have served me very well for five years give or take and I’ve never had any problems with it (not to say that it still
>> can’t be hardware problems, but I find that somewhat unlikely at the moment).
>> 
>> 
>> Could anyone please advice to what I can try to try to pinpoint the problem (and/or possibly fix it)?


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