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. <mconno...@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 <wch...@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. <mconno...@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 <mich...@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@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@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@pdxlinux.org > > > > http://lists.pdxlinux.org/mailman/listinfo/plug > > > > > > > _______________________________________________ > > > PLUG mailing list > > > PLUG@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@pdxlinux.org > > http://lists.pdxlinux.org/mailman/listinfo/plug > > > _______________________________________________ > PLUG mailing list > PLUG@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@pdxlinux.org http://lists.pdxlinux.org/mailman/listinfo/plug