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Re: Puzzle about networking
by Phil Ashby 21 Dec '23

21 Dec '23

On 21/12/2023 12:00, <peter.northerly(a)gmail.com> wrote: > ifconfig gives this: > enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 > inet6 fe80::d2da:494:eadc:4e0b prefixlen 64 scopeid 0x20<link> > ether 08:60:6e:e7:d2:be txqueuelen 1000 (Ethernet) > RX packets 0 bytes 0 (0.0 B) > RX errors 0 dropped 0 overruns 0 frame 0 > TX packets 982 bytes 158082 (154.3 KiB) > TX errors 1 dropped 0 overruns 0 carrier 0 collisions 0 I'm suspicious of the complete lack of received packets there. It appears you are sending (probably DHCP requests), but getting nothing back. Things to check: 1/ The cable - swap out for a known working one (from another PC?) 2/ The sockets - dust bunnies cause havoc ;-) 3/ Everything other than the affected machine - pop a different device on the end of the cable if you have one (or borrow one!) 4/ The kernel message log (/var/log/kern.log and/or dmesg) might be shouting about something unwell. 5/ Recent software changes (updates perchance? new kernel?), can you roll back (kernel - most likely you can pick previous at boot) (more advanced detective work) 6/ Fire up a packet sniffer (tshark, wireshark) and watch for packets going in/out of the device on the affected machine. 7/ If you have a network *hub* (NOT a switch), then pop that in line and use another machine to watch for packets to/from the MAC address (I'd use tshark or wireshark, YMMV) on another port of the hub. My money is on a recent kernel change borking receive or dust bunnies. Phil.

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Puzzle about networking
by peter.northerly＠gmail.com 20 Dec '23

20 Dec '23

Puzzle about networking. Any suggestions? All of a sudden and for no apparent reason my ethernet connection isn't working. Its not the router, other machines on the router work fine. Its not the local powerline device, I have changed that out. The machine also works fine with a mobile data dongle plugged in to a usb port. So I think it must be something about the configuration, though why it should suddenly have changed is a mystery to me. I do ip link, and this shows as number two: 2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000 link/ether 08:60:6e:e7:d2:be brd ff:ff:ff:ff:ff:ff So then I do ifup enp3s0, and get this: ~$ sudo ifup enp3s0 ifup: unknown interface enp3s0 When I use the gnome network control tool it fails to bring it up. ip link set appears to work, at least no error message. ifconfig gives this: enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::d2da:494:eadc:4e0b prefixlen 64 scopeid 0x20<link> ether 08:60:6e:e7:d2:be txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 982 bytes 158082 (154.3 KiB) TX errors 1 dropped 0 overruns 0 carrier 0 collisions 0 So why can't I bring it up with ifup? Rebooting doesn't make any difference. I don't know what else to try. Its probably something very simple that I am just missing.... Peter

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Puzzle about networking, continued...
by peter.northerly＠gmail.com 20 Dec '23

20 Dec '23

Also systemctl status NetworkManager gives this: NetworkManager.service - Network Manager Loaded: loaded (/lib/systemd/system/NetworkManager.service; enabled; preset: enabled) Active: active (running) since Wed 2023-12-20 16:53:00 GMT; 1h 39min ago Docs: man:NetworkManager(8) Main PID: 769 (NetworkManager) Tasks: 3 (limit: 19064) Memory: 14.1M CPU: 545ms CGroup: /system.slice/NetworkManager.service So that's working. I have come on the suggestion to disable it and then configure /etc/network/interfaces manually. What do you think? Peter Puzzle about networking. Any suggestions? All of a sudden and for no apparent reason my ethernet connection isn't working. Its not the router, other machines on the router work fine. Its not the local powerline device, I have changed that out. The machine also works fine with a mobile data dongle plugged in to a usb port. So I think it must be something about the configuration, though why it should suddenly have changed is a mystery to me. I do ip link, and this shows as number two: 2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000 link/ether 08:60:6e:e7:d2:be brd ff:ff:ff:ff:ff:ff So then I do ifup enp3s0, and get this: ~$ sudo ifup enp3s0 ifup: unknown interface enp3s0 When I use the gnome network control tool it fails to bring it up. ip link set appears to work, at least no error message. ifconfig gives this: enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::d2da:494:eadc:4e0b prefixlen 64 scopeid 0x20<link> ether 08:60:6e:e7:d2:be txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 982 bytes 158082 (154.3 KiB) TX errors 1 dropped 0 overruns 0 carrier 0 collisions 0 So why can't I bring it up with ifup? Rebooting doesn't make any difference. I don't know what else to try. Its probably something very simple that I am just missing.... Peter

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touchpad weirdness
by Bev Nicolson 22 Nov '23

22 Nov '23

Every so often the touchpad, and indeed any mouse function as far as I can tell, fails. The cursor just flickers and dances about uncontrollably. I've found out how to close a window and shutdown the laptop using the keyboard but how do I figure out what's going on here? There are no outstanding updates to install if that makes a difference. Bev.

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"New" PC
by Mark Rogers 10 Nov '23

10 Nov '23

I'm in the market for a new desktop PC ("workstation"). No interest in gaming, Will want to run (probably) Ubuntu and a handful of VMs, plus FF or Chrome with a couple of hundred tabs open. I'm more than happy to get one that's a few years out of date and refurbished if it gets me decent value. My existing PC is a i5-6400 CPU @2.7GHz, with 24GB RAM - I've probably had it about 7 years. I don't really have a budget in mind - probably max £1k inc VAT. It's so long since I looked at PCs or CPUs that I have no idea what to look for any more. Going to want at least 1TB SSD (preferably 2TB) but I can add that myself afterwards (although that would affect budget). Min 32GB, maybe 64GB RAM? What should I be looking for (and where should I be looking)? -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0344 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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Transferring files over SSH
by Mark Rogers 09 Nov '23

09 Nov '23

I often seem to find myself in this scenario: - I SSH into Server A using my personal key - I SSH into Server B using my personal key I find files I need on B that I need to transfer from B Usually the files are quite small so I'll just transfer them to my own PC as an intermediary. But I now need to transfer about 30GB from A to B so it seems like the right time to find a better way. I don't really want to have to give A permanent access to B (albeit I can always delete the key later, it seems like the sort of thing that would get forgotten). -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0344 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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Re: Transferring files over SSH
by Mark Rogers 09 Nov '23

09 Nov '23

On Thu, 9 Nov 2023 at 12:26, BD <dzidek23(a)gmail.com> wrote: > > How about using scp, it is like cp but over an ssh? scp/rsync is how I'd have done it in the past but that (to my understanding anyway) needs A to have SSH access to B (or vice versa) so I'd either need password based logins (which is how I used to do it but I'm trying to be better!) or creating a key on A and authorising it on B (or, again, vice versa) which I don't really want to be doing for a one-off file transfer. -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0344 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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Transferring settings and data from Firefox and Thunderbird
by Bev Nicolson 02 Nov '23

02 Nov '23

It looks like I will be getting another laptop as my old one is reaching the end of the road. I want to be certain about what I'll be doing, hence asking. What I want to do is transfer all the bookmarks (I have *a lot*), passwords and settings for Firefox over. Is creating a profile the easiest way of doing that? I also want to ensure I have the folders of old emails saved in Thunderbird somewhere safe. Those are emails I have stored on the laptop, not online. Transferring Thunderbird's settings would be a bonus too. If I create a Thunderbird profile, will it do both of those things? Bev.

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Re: Trojans....
by Peter Berrie 27 Oct '23

27 Oct '23

On Fri, 20 Oct 2023 12:00:02 +0100 main-request(a)lists.alug.org.uk wrote: Adam, Thanks for replying! > Have you ever saved or copied a browser cache onto this stick? No, this is the puzzling thing. I only seem to recall having used it on Debian. I've only used it to put some files on it which I then accessed from my laptop, which is also Debian. So I cannot think where these can have come from. I am wondering if possibly they were on the stick itself when I bought it. They are not going to be able to do anything in Linux, are they? I have also checked online and found a couple of similar trojans which MS AV says it detects, so they sound like Windows trojans. I am thinking now of having clamav run all night on my total Debian hard drive, in recursive mode. That ought to detect them, do you think, if they are on it? Is there anything else you would do? My laptop is dual boot, windows and Debian, so I will boot to windows and then run the MS AV in windows. I suppose run ClamAV in Debian after that. What a pain. But in Windows it would probably be a lot more than just a pain. Peter

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Comparing XML files
by Mark Rogers 26 Oct '23

26 Oct '23

This has been driving me mad all afternoon. How can I compare xml files from the commandline? Specifically: If I have two XML files and one contains: ... <field name="A">ValueA</field> <field name="B">ValueB</field> ... and the other contains: ... <field name="B">ValueB</field> <field name="A">ValueA</field> ... ... then I consider those two files to be the same, but obviously a diff will not. How can I compare just the content and not the ordering/formatting/etc? -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0344 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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