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Re: My wired connection doesn't work suddenly (Debian sid)


On Sun, Aug 26, 2018 at 07:42:31AM -0300, Vinícius Couto wrote:
> Hi,
> I use Debian sid and some weeks ago, a upgrade in some package caused a
> strange thing.
> I use my computer, when my wired connection down. Sometimes only the IPv4,
> sometimes all the connections.

Yet another NetworkManager fault, most likely. The thing lives to its
reputation once more.

> The symbol of the wired connection says that the connection is working.
> When i disable to use a wireless connection in the same network, it works.

Of all the ways to test network connection you just used the least
informative one. Please share the output of "ip a l" and "ip ro l" next
time this happens.

> When i use dmesg | grep r8169
> r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
> r8169 0000:02:00.0 eth0: RTL8168evl/8111evl at 0x        (ptrval), ..., XID
> ... IRQ ..
> r8169 0000:02:00.0 eth0: jumbo features [frames: 9200 bytes, tx
> checksumming: ko]

Pretty normal.

> r8169 0000:02:00.0 enp2s0: renamed from eth0

That's systemd thing.

> r8169 0000:02:00.0: firmware: direct-loading firmware rtl_nic/rtl8168e-3.fw

And here you've used non-free blob, which is most likely completely
unnecessary. But it's unlikely that any of these are somehow related to
your problem.

> dmesg | grep enp2s0
> TCP: enp2s0: Driver has suspect GRO implementation, TCP performance may be
> compromised.

And that says that your NIC has problematic Generic Receive Offload
implementation, yet kernel enabled it.
Try "ethtool -K enp2s0 gro off" if it bothers you, but it'll unlikely
will have any visible effect.

> What is happening to my computer?

Network Manager. See above.


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