[PLUG] Debian Buster and USB3...

Thu Apr 16 13:19:22 UTC 2020

In my case I knew my NIC card was working just fine, but I saw that I
had an issue with the network (DNS resolution) MTR showed me
where it was, I gave a printout to ATT and asked about changing
the DNS in the modem. I was told it was hardwired. (It would over-
ride the public DNS in my router) when I was told there was no
work around, I said there was, it was called Cox... Their gear ended
up at the UPS store.

On Thu, Apr 16, 2020 at 1:36 AM Mike C. <mconnors1 at gmail.com> wrote:

> I use MTR to do some of that testing. It is kind of like traceroute but
> gives a lot more info.
>
> It is traceroute, "Matt's or My" traceroute. Bit It also includes ping sent
> / reply stats per hop after the route is traced and  some other options
> that are useful for checking all the network hops from end to end.
>
> There are a slew of commands and utilities for network troubleshooting. But
> tools don't fix problems by themselves.
>
> What I've seen on this list so many times is folks trying to troubleshoot
> networking related issues without a solid understanding of how networking
> actually works.
>
> The best tool that I know to use for determining if the NIC on your local
> computer is dropping packets is Ethtool:
>
> ethtool -S wlp2s0b1
>
> NIC statistics:
>      rx_packets: 478448
>      rx_bytes: 311948183
>      rx_duplicates: 2052
>      rx_fragments: 346639
>      rx_dropped: 2787
>      tx_packets: 134979
>      tx_bytes: 24760285
>      tx_filtered: 0
>      tx_retry_failed: 1250
>      tx_retries: 17627
>
> Ethtool even has an option for a NIC self-test.
>
> ~ $ sudo ethtool -t enp0s25 offline
> The test result is FAIL
> The test extra info:
> Register test  (offline) 0
> Eeprom test    (offline) 0
> Interrupt test (offline) 0
> Loopback test  (offline) 0
> Link test   (on/offline) 1
>
> On Wed, Apr 15, 2020 at 8:37 PM Chuck Hast <wchast at gmail.com> wrote:
>
> > I use MTR to do some of that testing. It is kind of like traceroute but
> > gives a lot more
> > info.
> > When I moved to Oklahoma City, I got ATT internet (the other option was
> > Cox) they
> > brought out a modem and set it up. I tried to use the network, but it was
> > very slow
> > to resolve, once resolved it was blazing fast.
> > I used mtr to look at their DNS (the DNS was hardwired in the modem). At
> > that time
> > the DNS was down in Austin TX. It was 8 hops down there, about the 4th
> hop
> > down
> > there was a router that showed about 75% loss. Also had a lot of jitter.
> >
> > At least I knew that the issue was not on my end.
> >
> > On Wed, Apr 15, 2020 at 7:50 PM Mike C. <mconnors1 at gmail.com> wrote:
> >
> > > Is the USB network adapter support stable in Debian Buster? I ask
> > because I
> > > suspect that my USB3 gigabit network
> > > card is dropping packets.
> > >
> > > -- If it wasn't supported the driver wouldn't install, the module
> > wouldn't
> > > load and you wouldn't see the NIC listed in lsusb.
> > >
> > > -- With that being said, NIC drivers can also have bugs and in my
> > > past experience, especially with WIFI NIC drivers, it's possible to
> > install
> > > a non-compatible / non-working driver. Probably a much less common
> > problem
> > > these days.
> > >
> > > When I ping www.yahoo.com 10 times through this USB adapter hooked up
> to
> > > my
> > > Spectrum cable modem, I lose anywhere from 0% to 60% of the packets and
> > > this is happening consistently.
> > >
> > > -- Possibly bad test and bad assumptions. There are many network
> devices
> > > (hops) between your NIC and a yahoo server. Packets could be dropped or
> > is
> > > often the case just discarded as the device is configured not to
> respond
> > to
> > > ICMP packets.
> > >
> > > -- If you really think there's a local problem with the NIC itself,
> start
> > > with testing the NIC first and then move out one step at a time.
> > >
> > > 1. Ping the loopback address of 127.0.0.1 to verify/ensure there's no
> > > TCP/IP stack issues.
> > >
> > > 2. Ping the ip address of the USB GIG NIC.
> > >
> > > 3. Ping the next hop ip address on the same ip subnet as the USB GIG
> NIC.
> > > The LAN gateway ip addr.
> > >
> > > 4. Ping the WAN side ip addr of your internet router.
> > >
> > > If that all checks good, then any network connectivity issues you're
> > > experiencing are out of your control.
> > >
> > > On Wed, Apr 15, 2020 at 3:30 PM <michael at robinson-west.com> wrote:
> > >
> > > > Is the USB network adapter support stable in Debian Buster? I ask
> > because
> > > > I suspect that my USB3 gigabit network
> > > > card is dropping packets.
> > > >
> > > > When I ping www.yahoo.com 10 times through this USB adapter hooked
> up
> > to
> > > > my Spectrum cable modem, I lose anywhere
> > > > from 0% to 60% of the packets and this is happening consistently.
> > > >
> > > > I do:
> > > >
> > > > $ ping -c 10 www.yahoo.com ; sleep 15 ; ping -c 10 www.yahoo.com ;
> > sleep
> > > > 15 ; ping -c 10 www.yahoo.com ; sleep 15 ; ping -c 10 www.yahoo.com
> > > >
> > > > If I'm lucky, one of these four rounds of ping will have a drop rate
> of
> > > 0%.
> > > >
> > > >  -- Michael Robinson
> > > >
> > > > michael at filter:~$ lsusb
> > > > Bus 009 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > > > Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > > > Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > > > Bus 007 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
> > > > Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > > > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > > > Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > > > Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > > > Bus 005 Device 002: ID 0b95:1790 ASIX Electronics Corp. AX88179
> Gigabit
> > > > Ethernet
> > > > Bus 005 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> > > > Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > > > michael at filter:~$
> > > >
> > > > I've ordered a PCI 32 bit gigabit card to bypass the USB entirely,
> but
> > > I'm
> > > > still curious if my hunch about a USB problem is correct.
> > > > _______________________________________________
> > > > PLUG mailing list
> > > > PLUG at pdxlinux.org
> > > > http://lists.pdxlinux.org/mailman/listinfo/plug
> > > >
> > > _______________________________________________
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> > > PLUG at pdxlinux.org
> > > http://lists.pdxlinux.org/mailman/listinfo/plug
> > >
> >
> >
> > --
> >
> > Chuck Hast  -- KP4DJT --
> > I can do all things through Christ which strengtheneth me.
> > Ph 4:13 KJV
> > Todo lo puedo en Cristo que me fortalece.
> > Fil 4:13 RVR1960
> > _______________________________________________
> > PLUG mailing list
> > PLUG at pdxlinux.org
> > http://lists.pdxlinux.org/mailman/listinfo/plug
> >
> _______________________________________________
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> http://lists.pdxlinux.org/mailman/listinfo/plug
>

-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960