- Roundtable - muug.ca

aggregating dsl lines
by Trevor Cordes 30 Sep '15

30 Sep '15

Is it possible to aggregate DSL lines, to combine them to get X-times the bandwidth on a single link? In this situation, I control both ends, the DSLAM and the DSL modem side on the other end of some POTS runs (CAT3-ish I assume, or worse). Note, I don't want load balancing or fancy routing/sharing. I need double (or more) the bandwidth for a single application (single TCP connection). If required, we can have linux/bsd boxes we control at either end of the links. If it's not possible, does anyone have any other ideas for somehow getting better bandwidth out of 500m POTS wires (quantity 4)? Thanks!

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Re: [RndTbl] aggregating dsl lines
by Brock Wolfe 29 Sep '15

29 Sep '15

Are there any reasons for not considering commercial (backbone) wireless gear for connecting points. It is a common practice for multi-building sites where project funds (or other constraints) prevent wired/fibre connections between buildings. On 9/29/2015 10:48 AM, roundtable-request(a)muug.mb.ca wrote: > Send Roundtable mailing list submissions to > roundtable(a)muug.mb.ca > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.muug.mb.ca/mailman/listinfo/roundtable > or, via email, send a message with subject or body 'help' to > roundtable-request(a)muug.mb.ca > > You can reach the person managing the list at > roundtable-owner(a)muug.mb.ca > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Roundtable digest..." > > > Today's Topics: > > 1. aggregating dsl lines (Trevor Cordes) > 2. Re: aggregating dsl lines (Colin Stanners) > 3. Re: aggregating dsl lines (Robert Keizer) > 4. Re: aggregating dsl lines (Adam Thompson) > 5. Re: aggregating dsl lines (Adam Thompson) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 29 Sep 2015 04:18:54 -0500 > From: Trevor Cordes <trevor(a)tecnopolis.ca> > To: MUUG RndTbl <roundtable(a)muug.mb.ca> > Subject: [RndTbl] aggregating dsl lines > Message-ID: <20150929091854.GA13606(a)pog.tecnopolis.ca> > Content-Type: text/plain; charset=us-ascii > > Is it possible to aggregate DSL lines, to combine them to get X-times the > bandwidth on a single link? In this situation, I control both ends, the > DSLAM and the DSL modem side on the other end of some POTS runs (CAT3-ish > I assume, or worse). > > Note, I don't want load balancing or fancy routing/sharing. I need double > (or more) the bandwidth for a single application (single TCP connection). > > If required, we can have linux/bsd boxes we control at either end of the > links. > > If it's not possible, does anyone have any other ideas for somehow getting > better bandwidth out of 500m POTS wires (quantity 4)? > > Thanks! > > > ------------------------------ > > Message: 2 > Date: Tue, 29 Sep 2015 07:09:51 -0500 > From: Colin Stanners <cstanners(a)gmail.com> > To: Continuation of Round Table discussion <roundtable(a)muug.mb.ca> > Subject: Re: [RndTbl] aggregating dsl lines > Message-ID: > <CAPoOROw+CvZAq_O2T+b0M7zukSEaydm10KzYCd6=fougATzkyg(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > At layers 2/3 you can do Multilink PPP or even something wierd and > questionably reliable like LACP over Ethernet-over-IP over the individual > connections, but given that it's only 500m and you control both ends the > best solution would likely be at > http://www.netsys-direct.com/Ethernet_Extenders_s/1814.htm , particularly > http://www.netsys-direct.com/product_p/nv-600ekit.htm > > On Tue, Sep 29, 2015 at 4:18 AM, Trevor Cordes <trevor(a)tecnopolis.ca> wrote: > >> Is it possible to aggregate DSL lines, to combine them to get X-times the >> bandwidth on a single link? In this situation, I control both ends, the >> DSLAM and the DSL modem side on the other end of some POTS runs (CAT3-ish >> I assume, or worse). >> >> Note, I don't want load balancing or fancy routing/sharing. I need double >> (or more) the bandwidth for a single application (single TCP connection). >> >> If required, we can have linux/bsd boxes we control at either end of the >> links. >> >> If it's not possible, does anyone have any other ideas for somehow getting >> better bandwidth out of 500m POTS wires (quantity 4)? >> >> Thanks! >> _______________________________________________ >> Roundtable mailing list >> Roundtable(a)muug.mb.ca >> http://www.muug.mb.ca/mailman/listinfo/roundtable >> >

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Mr. Robot (on Showcase)
by Bradford C. Vokey 17 Sep '15

17 Sep '15

Further to my recommendation to watch "Mr. Robot": For those that don't get Showcase in your Shaw cable package, it seems that you can watch Mr. Robot on-line for free here: http://www.showcase.ca/video#mrrobot/video New episodes every Friday!

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cheaper ISP
by Trevor Cordes 16 Sep '15

16 Sep '15

What's the cheapest option for a Winnipeg business to get decent (especially upload) internet access when they aren't in a Shaw area (but are in MTS). Right now they have MTS crappy like 5Mbps down and 400kbps up. It's horrible. We'd be fine with 5 or 10 (or more) down, but we want at least 2 up. The more up in our pricerange the better. Monthly traffic will be quite low in both directions, but we get large-demand bursts. Price range is $40-$80/month. They are willing to pay (a bit) more upfront to save on the monthly fee, if required. They need zero extra features (email boxes, web space, a/v, domain, etc), they just need faster internet. Lower latency than what garbage MTS gives would be better too. I already checked with MTS and what they want for more upload bw is way too much (compared to what Shaw charges). Thanks!

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Linux capabilities vs setuid-root
by Gilbert E. Detillieux 16 Sep '15

16 Sep '15

I mentioned Linux capabilities (setcap/getcap commands) briefly during last night's round-table session, and Trevor mentioned that he thought that recent Fedora releases had eliminated the use of setuid-root binaries in favour of capabilities-based binaries. (That's the stated goal, in any case.) Not sure about the very latest Fedora/Rawhide releases, but here are the numbers on a Fedora 21 host I was able to quickly check... $ getcap /usr/*bin/*|wc -l 10 $ ls -l /usr/*bin/*|grep '^...s'|wc -l 21 $ ls -l /usr/*bin/*|grep '^......s'|wc -l 7 $ All of the setuid binaries (in the second command) are setuid-root. The setgid binaries (last command) have varying group ID's. For comparison, here are the numbers on an EL7 host... $ getcap /usr/*bin/*|wc -l 8 $ ls -l /usr/*bin/*|grep '^...s'|wc -l 23 $ ls -l /usr/*bin/*|grep '^......s'|wc -l 9 $ The difference in counts between the two hosts likely has more to do with specific packages loaded than with actual differences in the distros, though. Note that Linux capabilities are intended to grant only specific kernel-based rights that were otherwise restricted to root, so it likely won't eliminate all setuid/setgid use cases, without some more drastic coding solutions. Gilbert -- Manitoba UNIX User Group E-mail: <gedetil(a)muug.mb.ca> c/o Gilbert E. Detillieux Web: http://www.muug.mb.ca/ University of Manitoba Phone: (204)474-8161 Winnipeg MB CANADA R3T 2N2 Fax: (204)474-7609

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Free e-books
by Gilbert E. Detillieux 10 Sep '15

10 Sep '15

Someone mentioned a web site offering a different free e-book each day, on various tech topics. Here's the correct URL for the site... https://www.packtpub.com/packt/offers/free-learning Enjoy! -- Manitoba UNIX User Group E-mail: <gedetil(a)muug.mb.ca> c/o Gilbert E. Detillieux Web: http://www.muug.mb.ca/ University of Manitoba Phone: (204)474-8161 Winnipeg MB CANADA R3T 2N2 Fax: (204)474-7609

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MUUG Meeting, Sept 8, 7:30pm -- Spacewalk (Room 1M28, UofW)
by Gilbert E. Detillieux 03 Sep '15

03 Sep '15

Update: Meeting will be in Room 1M28, Manitoba Hall, U of Winnipeg. ******************************************************************* The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, September 8. The meeting topic for this month is as follows: Spacewalk This month, Wyatt Zacharias will be presenting Spacewalk, an open source systems management tool. Spacewalk allows administrators to deploy, manage, configure, and monitor their enterprise Linux hosts. Spacewalk also provides update management, security scans, and more. RTFM In the RTFM segment this month, Rob Keizer will be showing us Homebrew (brew(1)). Homebrew is the easiest and most flexible way to install the UNIX tools that Apple didn't include with OS X. Door Prize This month we will be giving away (among our other usual prizes) a ticket to Bsides Winnipeg 2015. Security BSides is a global, non-profit organization that exists to facilitate the creation of local information security conferences. These conferences are ideally organized by locals, and feature local presenters. Unlike other conferences, BSides events are low-cost, relaxed, and inclusive, and attempt to encourage interaction amongst organizers, speakers, and attendees. BSides Winnipeg 2015 will take place on November 14th & 15th, 2015 at The King's Head Pub from Noon to 7pm. Cost is $20 and comes with a meal each day. The group holds its general meetings at 7:30pm on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ****************************************************************** Please note our *NEW* meeting location for this month: *Room 1M28* Manitoba Hall, University of Winnipeg, entrance on Ellice Ave. between Spence St. and Balmoral St. Parking is available on the surrounding streets and in the lots on nearby streets. Look for signage once you're at the building, or ask a security guard. ****************************************************************** For more information about MUUG, and its monthly meetings, check out their web server: http://www.muug.mb.ca/ Help us promote this month's meeting, by putting this poster up on your workplace bulletin board or other suitable public message board: http://www.muug.mb.ca/meetings/MUUGmeeting.pdf -- Manitoba UNIX User Group E-mail: <gedetil(a)muug.mb.ca> c/o Gilbert E. Detillieux Web: http://www.muug.mb.ca/ University of Manitoba Phone: (204)474-8161 Winnipeg MB CANADA R3T 2N2 Fax: (204)474-7609

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Setting resource limits in Ubuntu 14.04
by Kevin McGregor 01 Sep '15

01 Sep '15

I have a server VM running Ubuntu 14.04. It mostly just runs apt-cacher-ng, which I suspect is running into its limit on open files. What's the proper way to increase this limit? I know there's the limit in /etc/security/limits.conf, but I've read elsewhere that doesn't apply! I've also read about "stanzas" for "Upstart" in Ubuntu, but I have no idea where to look for the right place to put that. I'm expecting something like limit nofiles 20000 or some such. I believe the process is running under its own userid "apt-cacher-ng". Any pointers? Kevin

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MUUG Meeting, Sept 8, 7:30pm -- Spacewalk
by Gilbert E. Detillieux 01 Sep '15

01 Sep '15

The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, September 8. The meeting topic for this month is as follows: Spacewalk This month, Wyatt Zacharias will be presenting Spacewalk, an open source systems management tool. Spacewalk allows administrators to deploy, manage, configure, and monitor their enterprise Linux hosts. Spacewalk also provides update management, security scans, and more. RTFM In the RTFM segment this month, Rob Keizer will be showing us Homebrew (brew(1)). Homebrew is the easiest and most flexible way to install the UNIX tools that Apple didn't include with OS X. Door Prize This month we will be giving away (among our other usual prizes) a ticket to Bsides Winnipeg 2015. Security BSides is a global, non-profit organization that exists to facilitate the creation of local information security conferences. These conferences are ideally organized by locals, and feature local presenters. Unlike other conferences, BSides events are low-cost, relaxed, and inclusive, and attempt to encourage interaction amongst organizers, speakers, and attendees. BSides Winnipeg 2015 will take place on November 14th & 15th, 2015 at The King's Head Pub from Noon to 7pm. Cost is $20 and comes with a meal each day. The group holds its general meetings at 7:30pm on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ****************************************************************** Please note our *NEW* meeting location for this month: (Room TBA), University of Winnipeg, entrance on Ellice Ave. between Spence St. and Balmoral St. Check our web site for updates on meeting location. Parking is available on the surrounding streets and in the lots on nearby streets. Look for signage once you're at the building, or ask a security guard. ****************************************************************** For more information about MUUG, and its monthly meetings, check out their web server: http://www.muug.mb.ca/ Help us promote this month's meeting, by putting this poster up on your workplace bulletin board or other suitable public message board: http://www.muug.mb.ca/meetings/MUUGmeeting.pdf -- Manitoba UNIX User Group E-mail: <gedetil(a)muug.mb.ca> c/o Gilbert E. Detillieux Web: http://www.muug.mb.ca/ University of Manitoba Phone: (204)474-8161 Winnipeg MB CANADA R3T 2N2 Fax: (204)474-7609

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Ubuntu apt sources mirror architecture stuff
by Kevin McGregor 31 Aug '15

31 Aug '15

When I use dpkg -l | grep i386 on a x86_64 Ubuntu 14.04 system, I get an empty list. So, I'd assume (I guess incorrectly) that there are no i386 stuffses on this system. But when I do apt-get update I get a bunch of messages like W: Failed to fetch http://mirror/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found Why is it try to find info about i386 packages? How can I ensure there really are no i386 packages, and then force apt to not ever look for i386 updates? Kevin

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