Roundtable

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2555 discussions

Serial to IP Gateway?
by Wyatt Zacharias 20 Aug '16

20 Aug '16

So currently at Bluecross we have a pool of modems connected to a cisco 2600. What happens is when a connection is received on the modem line, the cisco router initiates an IP connection to an internal server and forwards the data from the serial line to the server. We're looking to move that Serial to IP functionality over to a Linux server so we can retire the EOL routers. Does anyone know of a way to do this? Also if anyone has any good resources for modem connectivity with linux they can forward me I'd appreciate it. -- Wyatt Zacharias

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Using Shaw 150 mbps down / 15 mbps up / 1 TB data plan on 100 mpbs ports and hardware
by Hartmut W Sager 18 Aug '16

18 Aug '16

I'm sure everyone here is well aware of Shaw's heavily promoted new Internet plan that gives 150 mbps down / 15 mbps up / 1 TB data per month. My big question is, are there any hiccups/hangups when this plan is used on 100 mpbs ports and hardware? A couple of my computers have 100 mbps (not gigabit) ethernet ports, and so does a router or two here. Obviously my download speed will be limited to slightly under 100 mbps, but my big fear is that the requisite stop/start handshaking protocol (if I encounter a server that wants to send/stream at over 100 mbps) could hiccup and hangup things. I don't even know at which layer/level such a protocol would operate. I've definitely had such hangups with stop/start handshaking protocols in the distant past, like with RS-232 serial. Hartmut W Sager - Tel +1-204-339-8331

4 8

DNS search/resolv.conf help!
by Kevin McGregor 17 Aug '16

17 Aug '16

I'm running Ubuntu 14.04 on a particular server. In the /etc/resolv.conf there are two search lines: search domA.example.org domB.example.org # [NOTE I made these up, but the form is the same] search domA.example.org I want the search setting to be just: search domA.example.org I've deleted the top/offending line, but every time I restart dnsmasq or run resolvconf -u (for example), the offending line comes back. Where is it getting the domB.example.org from? I've looked in all the usual places (I think), and tried "grep -R domB *" in /etc, but nothing turns up! I'm at a loss. Any pointers on where I should look next? Thanks, Kevin

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32 -> 64 offsite? just maybe?
by Trevor Cordes 13 Aug '16

13 Aug '16

In my unending quest to find an easy way to upgrade 32-bit Linux (Fedora) systems to 64-bit systems on headless boxes at remote sites (i.e. don't need to go onsite), I think I may have thought of a way. Can I get uber-genius approval? (Distro doesn't matter, same thought process should work on any distro/packagemgr.) 0. starting point is a working 32-bit userland and kernel install with ssh access only 1. install (force) 64b kernel on running 32b system, leave userland 32b, reboot. Though not supported by Fedora, this should work in theory, says the kernel guys. 2. trick dnf (nee yum; think apt-get) into thinking the system is 64 somehow (many ways to do this) 3. run dnf upgrade distsync (i.e. I'll go from F23 to F24 at the same time), all userland goes 64, manually delete any leftover 32's that aren't normally on a 64 system. 4. reboot, now kernel and ul are both 64 ... might work?? A completely offsite way to pull off this extremely tricky but urgently needed process? Potential gotchas? Maybe in step 3 the order of installs of libs vs bins goes wonky causing failure of forking / execing of new bg (think pre/postinstall) ps's? (Yes, I'll remember to ascii dump and stop any bitness-sensitive-data progs like mysql first, then restore from ascii.)

1 0

monster size 6502
by Trevor Cordes 31 Jul '16

31 Jul '16

This will bring a smile to some of us oldsters. http://monster6502.com/ (The picture halfway down the home page is cool)

1 0

help me test tcsh?
by Trevor Cordes 30 Jul '16

30 Jul '16

(If you want to help me, this will only take you 1 minute!) I've hit a bug in the new Fedora 23 version of tcsh. Can someone help me confirm this bug on another box? It *only* happens on 64-bit x86_64 so I need someone running 64-bit. Also, it only seems to happen if gcc5 is used to compile, so your distro has to be pretty new (Fedora 23 or newer for example). Preferably kernel 4+ too. You can tell if you're 64-bit using: uname -i If you see 64 in there, you're 64. Try: gcc --version If it's 5+ that's good. Lastly, see what kernel ver: uname -r If it's 4+ then we're in business... All I need from you if match the above is start tcsh: tcsh If it says command not found then you need to install it with your package manager, like "dnf install tcsh" or "apt-get ...whatever". Then start tcsh by typing tcsh. Here's the actual test, paste this in tcsh: complete find 'n/-user/u/' 'n/-exec/c/' then type: find . -user [TAB] (hit TAB key where I put tab above, don't type the brackets) Does it list the users on your system or does it list the files/dirs in the current directory? My bug is that it shows the files, not the users. Could also try: complete tcsh n/-c/c/ then type: tcsh -c [TAB] Should give the same results (showing files instead of commands). One last thing, please let me know your tcsh version: tcsh --version I've only gotten this bug to occur on 6.19. Aside: this is a first, the bug is ONLY on my x86_64 boxes and not my i686 PAE ones! Ha! Thanks all!

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Looking for Web Developer
by Gerald Brandt 30 Jul '16

30 Jul '16

Hi, I'm looking for a web developer (preferably PHP) to convert an existing Access 97 application to the web. Any recommendations? Gerald

3 2

Looking for a PHP dev
by Gerald Brandt 18 Jul '16

18 Jul '16

Hi, We have an old app written in Access we'd like moved to a web interface with an SQL backend. The app is fairly straight forward, as is the DB. We're looking for a PHP dev to port from Access to the web for us. Any good recommendations? I'm a bit short on details, but can make an appointment to see the existing app and the DB structure. Gerald

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Trevor's wacky slow 10MB/s disk I/O update
by Trevor Cordes 23 Jun '16

23 Jun '16

Thanks a ton for all the great suggestions at the meeting the other night about my slow disk I/O. (For those not at the meeting, this is the slow I/O issue I've been battling with for months and have asked about here on the mailing list numerous times.) I think Adam(?) suggested testing dd with an option to avoid the cache completely, after others thought it sounded like a cache issue. The option for that (after a quick RTFM) is oflag=direct. Here's the results of that on the system after being up a day (without my hourly test running): spinning rust: 5:15am ~#dd if=/dev/zero of=/dev/sda2 bs=1M count=200 conv=fdatasync 209715200 bytes (210 MB) copied, 9.07724 s, 23.1 MB/s 5:15am ~#dd if=/dev/zero of=/dev/sda2 bs=1M count=200 conv=fdatasync oflag=direct 209715200 bytes (210 MB) copied, 2.04618 s, 102 MB/s ssd: 5:18am ~#dd if=/dev/zero of=/dev/sdb2 bs=1M count=200 conv=fdatasync 209715200 bytes (210 MB) copied, 3.38177 s, 62.0 MB/s 5:16am ~#dd if=/dev/zero of=/dev/sdb2 bs=1M count=200 conv=fdatasync oflag=direct 209715200 bytes (210 MB) copied, 0.508799 s, 412 MB/s Whoa! Indeed we have a cache issue. Disks are near full speed when writing direct to disk, but slow when going through the cache. FYI, here's what top looks like after I ran the tests (for mem info): top - 05:21:49 up 1 day, 4:43, 1 user, load average: 0.00, 0.03, 0.07 Tasks: 212 total, 1 running, 211 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.0 us, 0.0 sy, 0.0 ni, 99.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 16522952 total, 4668792 free, 706636 used, 11147524 buff/cache KiB Swap: 0 total, 0 free, 0 used. 15709432 avail Mem So it looks like buff/cache is getting quite large after all (11GB). So we'll try the next suggestion: 5:23am ~#sync ; echo 1 >> /proc/sys/vm/drop_caches top KiB Mem : 16522952 total, 15508640 free, 706136 used, 308176 buff/cache 5:24am ~#dd if=/dev/zero of=/dev/sdb2 bs=1M count=200 conv=fdatasync 209715200 bytes (210 MB) copied, 4.39049 s, 47.8 MB/s So that doesn't help at all (that's the ssd and should be 400-500MB/s). Very strange indeed! At least I have some better search terms to google with in the next few days... maybe I'll get lucky.

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muug.ca/mirror debian jessie issue
by Theodore Baschak 13 Jun '16

13 Jun '16

Good Morning: I got the following cron-apt error in my email overnight: CRON-APT RUN [/etc/cron-apt/config]: Mon Jun 13 04:00:01 CDT 2016 CRON-APT SLEEP: 3104, Mon Jun 13 04:51:45 CDT 2016 CRON-APT ACTION: 0-update CRON-APT LINE: /usr/bin/apt-get -o quiet=1 update -o quiet=2 E: Release file for http://muug.ca/mirror/debian/dists/jessie-updates/InRelease is expired (invalid since 12h 34min 34s). Updates for this repository will not be applied. I ran apt-get update again and its coming up with the same file being expired since 15 hours ago. I'll try again later this morning too, perhaps its just in the middle of pulling a new mirrored file down or something. Theodore Baschak - AS395089 - Hextet Systems https://ciscodude.net/ - https://hextet.systems/ https://theodorebaschak.com/ - http://mbix.ca/

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