July 2018 - luv-main - example.com

strange 6in4 errors - what does "RX errors" mean?
by Russell Coker 29 Sep '18

29 Sep '18

# ifconfig 6in4 6in4: flags=209<UP,POINTOPOINT,RUNNING,NOARP> mtu 1280 inet6 2a01:4f8:140:71f5:1::ffff prefixlen 128 scopeid 0x0<global> inet6 fe80::a08:1 prefixlen 64 scopeid 0x20<link> inet6 fe80::2e04:7ca5 prefixlen 64 scopeid 0x20<link> inet6 fe80::a0a:a01 prefixlen 64 scopeid 0x20<link> sit txqueuelen 1 (IPv6-in-IPv4) RX packets 563 bytes 69361 (67.7 KiB) RX errors 1200 dropped 0 overruns 0 frame 1200 TX packets 600 bytes 164726 (160.8 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Above is the result of running ifconfig on my 6in4 device. The problem is the "RX errors" which correspond to ICMP packets missing. The system at the far end of the 6in4 link has monitoring that includes "ping6 www.google.com", until recently that was fine, since upgrading to Debian kernel 4.9.0-7-amd64 #1 SMP Debian 4.9.110-1 problems have started. The problems are somewhat intermittent. I don't expect that the recent Debian kernel upgrade broke this, maybe the reboot exposed some other problem. Does anyone know what "RX errors" means in the context of 6in4 interfaces on Linux? Is there any way of getting the kernel to log every error to dmesg or something? I expect this will be a really easy problem to solve once I know what the errors mean. When the errors happen I run tcpdump on the far end of the 6in4 link and see the packets going out, I run tcpdump on the ethernet device and see the encapsulated packets going in, and when I run tcpdump on the 6in4 device I don't see those packets but I do see packets for local ipv6 addresses. Here's the /etc/network/interfaces section from the server: auto 6in4 iface 6in4 inet6 v4tunnel address 2a01:4f8:140:71f5:1::ffff netmask 128 endpoint 203.15.121.80 ttl 64 up ip link set mtu 1280 dev 6in4 up ip route add 2a01:4f8:140:71f5:1::/96 dev 6in4 Here's the /etc/network/interfaces section from the other end: auto 6in4 iface 6in4 inet6 v4tunnel address 2a01:4f8:140:71f5:1::1 netmask 128 endpoint 46.4.124.165 ttl 64 up ip route add 2a01:4f8:140:71f5:1::ffff dev 6in4 up ip link set mtu 1280 dev 6in4 up ip route add 2000::/3 dev 6in4 Here's the result of running tcpdump on the server, those encapsulated packets look ok and should go to the 6in4 device. # tcpdump -i br0 -n host 203.15.121.80 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on br0, link-type EN10MB (Ethernet), capture size 262144 bytes 01:18:57.333752 IP 203.15.121.80 > 46.4.124.165: IP6 2a01:4f8:140:71f5:1::4 > 2404:6800:4006:800::2004: ICMP6, echo request, seq 14, length 64 01:18:58.357831 IP 203.15.121.80 > 46.4.124.165: IP6 2a01:4f8:140:71f5:1::4 > 2404:6800:4006:800::2004: ICMP6, echo request, seq 15, length 64 01:18:59.381702 IP 203.15.121.80 > 46.4.124.165: IP6 2a01:4f8:140:71f5:1::4 > 2404:6800:4006:800::2004: ICMP6, echo request, seq 16, length 64 01:19:00.405686 IP 203.15.121.80 > 46.4.124.165: IP6 2a01:4f8:140:71f5:1::4 > 2404:6800:4006:800::2004: ICMP6, echo request, seq 17, length 64 Any ideas? -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Fwd: [Linux-aus] Linux Humble Bundle today
by Andrew Pam 30 Jul '18

30 Jul '18

Last chance to get a bundle of Linux books: -------- Forwarded Message -------- Subject: [Linux-aus] Linux Humble Bundle today Date: Mon, 30 Jul 2018 08:34:13 +1000 From: Kathy Reid via linux-aus <linux-aus(a)lists.linux.org.au> Reply-To: Kathy Reid <kathy(a)kathyreid.id.au> To: linux-aus(a)lists.linux.org.au https://www.humblebundle.com/books/linux-geek-books?partner=itsfoss Best, Kathy _______________________________________________ linux-aus mailing list linux-aus(a)lists.linux.org.au http://lists.linux.org.au/mailman/listinfo/linux-aus

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New Australian Government Data Sharing and Release Legislation: Issues paper for consultation
by h 29 Jul '18

29 Jul '18

I just found a reference to this in my email - it came to me last week from a WA government mailing list. https://www.pmc.gov.au/resource-centre/public-data/issues-paper-data-sharin… I have not looked at this in detail yet, but open data strikes me as very important for open source software. Has this been discussed in the open source community? Am I misreading its relevance? HDixon

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Good starting point for learning about IPv6?
by Anthony 28 Jul '18

28 Jul '18

Hey folks, Where's a good place to learn about IPv6? I've *mostly* got my head around IPv4 these days, and my ISP still only has an unsupported 6rd gateway which I've tried with momentary success on my router. I understand that the address space is 128 bits vs 32, that successive colons mean 0000 between them, that devices can have "local" and "global" scoped addresses, and it's *supposed* to do away with NAT... but that's about as far as I've gotten :) A server I lease overseas has an IPv6 address block assigned to it, and I'm struggling to figure out how I'm supposed to assign a reverse DNS to it, so Google and friends don't flag it for the MTA not having a reverse lookup (for now, I just lock it to IPv4)... I figured I might as well learn more about how it works, different to IPv4.. Any practical pointers?

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Fwd: Pass along this special subscription offer to your fellow LUG members.
by Andrew Pam 28 Jul '18

28 Jul '18

Date: Sat, 28 Jul 2018 06:06:16 +1000 From: Linux Journal Subscription <subs(a)linuxjournal.com> Reply-To: subs(a)linuxjournal.com Special rate for fellow LUG members Subscribe Now <https://linuxjournal.cmail20.com/t/j-l-nihkko-jjjlyklulk-r/> To our Linux User Group Panel, We'd like to provide a special introductory subscription rate of for you to pass along to all of your fellow Linux User Group members: $24.50 for a one-year subscription ($10 off our regular rate). Please feel free to post or forward this link <https://linuxjournal.cmail20.com/t/j-l-nihkko-jjjlyklulk-y/> (https://pubservice.com/Subnew2page.aspx?PC=LJ&pk=M8ALUGS) to anyone you think would be interested in saving $10 off our regular subscription price. Offer expires August 31, 2018. We're working hard to bring you the best long-form, technical journalism in the open-source space, and look forward to continuing to serve you. Your friends at /Linux Journal/ LUG MEMBER NEW SUBSCRIPTION <https://linuxjournal.cmail20.com/t/j-l-nihkko-jjjlyklulk-j/> Facebook <https://linuxjournal.cmail20.com/t/j-l-nihkko-jjjlyklulk-t/> Twitter <https://linuxjournal.cmail20.com/t/j-l-nihkko-jjjlyklulk-i/> YouTube <https://linuxjournal.cmail20.com/t/j-l-nihkko-jjjlyklulk-d/> Linux Journal, 9 5 9 7 Jones Rd #331, Houston, TX 77065

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Today is SysAdminDay :)
by David Zhan 27 Jul '18

27 Jul '18

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intermittent sound on Ubuntu 16.04
by stripes theotoky 23 Jul '18

23 Jul '18

We hear the chimes when the computer starts but then sometimes there is sound sometimes there isn't, sometimes when there is sound it vanishes after the computer suspends. Everything else about the computer seems to be working fine. It is a dell laptop running ubuntu 16.04. Have worked though the first two steps in this with no effect. About to start working on step 3 but in if anyone has any better ideas they would be most welcome. https://help.ubuntu.com/community/SoundTroubleshootingProcedure Could bring the laptop to a meeting in Melbourne if someone could look at it for me. I have lost my voice and may not speak on doctors orders so we would have to discuss the problem even if face to face in writing. Anything to make life more complicated than it already is. All the best -- Stripes Theotoky -37 .713869 145.050562

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Save and restore window positions with openbox
by Kim Oldfield 23 Jul '18

23 Jul '18

Hi, Does anyone know how I can save (and later restore) the positions of my windows on my screens? On my laptop I'm running openbox as my window manager on Ubuntu 18.04. At my desk I have a docking station with 2 external monitors. I've configured keyboard shortcuts in openbox to configure my screens appropriately for docked or undocked configuration (using xrandr). Whenever I undock all my windows get moved over to fit on the laptop screen - so when I dock the laptop again the windows are in the wrong locations, and I have to manually position them in the appropriate locations for my external monitors. What I would like is a way to save my window positions before undocking, and then a way to restore these window positions when I dock again later. Does anyone have a solution or suggestions to help with this problem? Regards, Kim

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real time log watching
by Russell Coker 16 Jul '18

16 Jul '18

What's a good real-time log watching program? This is something I've wanted for a while but not had the inclination to get it going. The thing that finally made me want to do it is when my workstation gave the below log messages and decided to stop supporting USB 3.0 ports. As the ports that are most convenient for connecting my keyboard and mouse are USB 3.0 that was inconvenient. Removing the xhci modules and loading them again fixed the problem. So what I want in this instance is a program that will detect one of the below messages and then run a script that will run some rmmod and modprobe commands to fix it. I want it to know which log entries it has dealt with to avoid performing the operation twice (which would cause problems) or maybe have a list of log messages in the problem solved category. Any suggestions? [18408.111698] xhci_hcd 0000:06:00.0: xHCI host not responding to stop endpoint command. [18408.111716] xhci_hcd 0000:06:00.0: xHCI host controller not responding, assume dead [18408.111738] xhci_hcd 0000:06:00.0: HC died; cleaning up [18408.111747] xhci_hcd 0000:06:00.0: Timeout while waiting for configure endpoint command -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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NBN Cabling responsibilities and CSG
by Tom Robinson 11 Jul '18

11 Jul '18

I'm hoping someone here may have some insight to cabling responsibilities under the NBN and also my expected rights under the Customer Service Guarantee (CSG). I was talking to Internode today about transitioning to the NBN and had a few surprises: 1. I will now be responsible for the cabling from my wall socket to some as yet undefined location in the street (sales guy couldn't tell me where that was). 2. I have to waive my rights to the CSG. I have had two occasions in the last year when I've had to call Telstra to come and fix my line issues (which they did at no cost to me). What can I expect under the NBN? -- Tom Robinson 19 Thomas Road Mobile: +61 4 3268 7026 Healesville, VIC 3777 Home: +61 3 5962 4543 Australia GPG Key: 8A4CB7A7 CONFIDENTIALITY: Copyright (C). This message with any appended or attached material is intended for addressees only and may not be copied or forwarded to or used by other parties without permission.

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