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Everything posted by systems_glitch

  1. This happened this morning: Apparently the floppy drive had a pretty much dead short in it. Apparently the supply on the bench either doesn't have a functioning shutdown circuit or it's high enough wattage that it didn't see this as a problem. Now the shop stinks of burning wire.
  2. Not very in-depth, but an interesting read if you don't know about the old microwave relay system:
  3. Remember when we did these? Digium TDM400P with 2x FXS modules for $25 shipped: Show off your 1337ness with a Digium backpack! Soekris 4801 Router/Firewall/Embedded platform, probably not enough RAM for full pfSense nowadays but they run old copies of m0n0wall and straight OpenBSD great:
  4. I recently bought an APC AP9211 MasterSwitch, which is a remote controllable 8-outlet PDU. It's got 8 switchable standard outlets so you can poweron/poweroff/reboot machines remotely. It came with an AP9606 web/SNMP management card, which is usable in a bunch of older UPSes and such. The AP9211 is an older unit, but switching power on and off isn't very complicated, and the newer units mostly boast features I don't really need (built in power meters, "too much current" type alerts, et c.), so I bought a cheap AP9211 online. It of course came with an existing, non-reset configuration. The official guide sez to use a serial cable to reset passwords, but I didn't have a USB -> RS232 adapter on hand, so I looked for known vulnerabilities in the management card, and found this little gem: Looks like you can dump the EEPROM over a telnet session using a master password that the factory uses to configure new systems (setting things like MAC addresses). I fired up tcpdump and power-cycled the unit to try and figure out what IP/subnet it was configured for. Got an ARP request and grabbed it -- Sure enough, telnet in, enter any username and the master password, and you end up in debug firmware! I was able to get the existing password from EEPROM and log in. I could see maybe having this feature on the console port of the management card, but it sure does seem short-sighted to put it on the telnet interface! I wonder how many of these things are still in service -- betting quite a few, since the management cards work in a bunch of different APC products, and things like the MasterSwitch don't really become less useful with age.
  5. The industrial ones are usually opto-isolated and should stop something like a USB Killer. That's what the datasheets say anyway, I've never purposefully tried to destroy one
  6. Yeah, there are USB isolators you can get from industrial suppliers that will protect your machine, too (used to prevent a catastrophic failure on a machine tool from blowing up the control system). I would probably just grab the cheapest throwaway laptop in the parts heap/thrift store/whatever and use it, if I were going to check these out. Another thing to look at is local geocaches. I've found a few on hikes that had USB drives in them.
  7. I have actually seen a dead drop embedded in a wall in Cambridge, MA, near the MIT campus (shocking, right?). I did not dare plug my own piece of equipment in there I've heard of people building "wifi throwies," like the LED graffiti thing (LED + battery + magnet, they stick to ferrous surfaces and...well, stay lit up for a while). The idea was to take something like an ESP8266 and a lithium cell, attach a sufficiently strong magnet, and stick it somewhere public. Being an embedded wifi module, they were probably only serving text or static HTML.
  8. Yeah, I'll drop stuff on my website sometimes, as well. The thing with the print shop is, they have *horrible* Internet to start with, so you may or may not be able to download a file if it's more than 1-2 MB. I'm usually printing large electronic schematics in 11x17" tabloid format, so the flash drive is advantageous there. I don't really use them for booting much anymore, though I will load Slax (Slackware based live distro) on a drive for testing now and then. Mostly I netboot stuff for new installs, it's faster and you don't have to mess around with iffy embedded BIOS USB boot implementations. Sometimes 5.25", sometimes 3.5"...but I also have a few systems that are still using 8" floppies Some of it is hard sector too, where the sector start boundaries are marked by a number of physical holes punched in the disk.
  9. I still use flash drives to take stuff to untrusted computers -- for example, when I take something to the print shop to be run off in large format. These types of places (print/copy shops, library, et c.) don't run a primary business of having safe, secure computers, and they let you plug in and run pretty much anything, so I will typically use a flash drive to take files, then nuke it when I get home. I don't log into anything on those computers, I've seen people at the print shop logged in with their cloud storage, email, whatever. Seems like a great way to get keylogged or your session cookie swiped or something. For moving stuff around between computers I trust, yeah, I don't really use flash drives anymore. Ironically I do still use floppies -- but that's only because part of my business is legacy systems repair/maintenance.
  10. It looks like Digium is running their own Git server, under which DAHDI is hosted: Might see about sending them a PR or diff patch.
  11. Tried a DVD drive last night, it doesn't like it as either master, slave, or cable select. I unplugged the hard disk and stuck a bootable Slax CF card in the CompactFlash slot. Looks like it comes up as master on primary IDE, so you can't use the CF and IDE master at the same time. A lot of CF cards won't work as a master with an IDE slave, so probably you ought to pick one or the other. Anyway, Slax boots fine, identifies all of the Ethernet interfaces, and all of the Ethernet interfaces work (grab IP/IPv6 addresses and will communicate). I have memtest86+ on that CF card too, so I let it run for several passes. Seems to be completely stable with the 933 MHz CPU and 256 MB RAM.
  12. I picked up a MultiTech Systems RouteFinder RF600VPN router/firewall/VPN thing for really cheap recently. It's a 1U rack mountable device with three Ethernet ports, serial, USB, modem, and a VGA connector. The VGA and USB suggested it was probably an x86 compatible thing that could be repurposed to run pfSense/opnsense/plain old OpenBSD. I had time to take it apart today, did not disappoint: Plain looking beige 1U box Nice front panel status readouts though, interfaces helpfully labeled LAN, WAN, DMZ. Ports! The VGA was a tipoff that there was probably an x86 PC inside. Oh look, an x86 PC! It's a custom motherboard but it uses a standard Intel chipset, Socket 370 CPU, 168-pin SDRAM, 44-pin 2.5" IDE hard disk, and has a free PCI slot and CF slot. CPU was a 566 MHz Celeron, replaced with a random 933 MHz P3 I had which works just fine. I upgraded the RAM from 128 MB to 256 MB. Looks like the Ethernet interfaces are real Intel eepro100 devices! Should make for a good router/firewall. There are keyboard/mouse PS/2 ports hidden inside. Oddly enough they don't seem to like a keyboard plugged in. A USB keyboard works fine, though. You can see a floppy drive header to the right of the PS/2 ports, and a modem module below the ports. The red jumper to the upper-left appears to be a "turn the power on" jumper -- it won't power up without it. I suspect it's for a front-mounted power switch, which this model doesn't use. Hardware summary screen, internal hard disk is 15 GB. Oh look, it's loading Linux with LILO... Apparently this used to be the router for some city hall. "But glitch, you seem to have root!" Yeah...the root password was set to "admin." Everything's on default. That's as far as I've gotten with this, next thing I'll do is probably dump the hard disk (or just swap it out) and get ready to put something better/more modern on there. I'll probably plug in a CD drive and try booting Slax Linux (Slackware-based Live CD).
  13. Oh, I've taken the DNS record out by this point. Basically, there are things out there that treat DNS records like they're always clean text that can just be shoved into whatever without sanitizing. I'd set up a DNS resource record that did Javascript XSS in the browser when a particular DNS record was displayed. The rDNS on 2001:470:1f07:b75::1337 is still present, if you go to the tool in the second link and paste in that address in the IPv6 rDNS lookup, you'll see a bold hi! on your screen. I'll set up the address again if you guys want to see how that works.
  14. Apparently someone else thought about this a few years ago, but I was working on my Dynamic DNS project last night and thought, how many websites grab DNS or reverse DNS information and just pass it to the browser, unescaped? Apparently nonzero: Click the button The following site works for both forward lookup on and reverse lookup on 2001:470:1f07:b75::1337 Another example of how no external data should ever be trusted!
  15. link to the Hack a Day article: Feeling pretty good about that decision to move to KiCAD with the 4.0.0 release
  16. You sure do forget all the little tricks and keyboard shortcuts in a hurry! Don't trust bulk pack bargain bin CD-Rs with important data?! I've got a few spindles of Verbatim archival grade stuff for work and really important permanent backups. Stuff that changes some times gets put on Magneto-Optical cartridges.
  17. Since getting the HP 420 squared away with a proper mirrored ZFS volume, I've been working on getting to the point where I can shut down my old workstation, which was still limping along running a few applications, like my Dynamic DNS widget. I needed somewhere to run things like the Dynamic DNS system, and leave a tmux running for persistent IRC. I don't have a server rack up yet, so my old VM hosting box is currently offline. It's really too loud to run out in the main workshop area (you can hear it upstairs, the workshop is in the basement). Until then, I dug into the junk bin and put together a server: The case is a massive Lian Li aluminum ATX server case. I picked it up at a local tech surplus auction for, I think $10, with a power supply and a DVD drive. It looks kinda silly with so little hardware in it: The motherboard is an Intel Desktop Board DP43TF from a machine I built in probably 2009 and dismantled in 2010 or 2011 -- it developed a RAM error and I stole the Xeon CPU out of it to use in something else. The CPU is an Intel Core 2 Duo E4300, 1.8 GHz LGA775, 2 MB cache, that came from a computer we found in the trash that had exploded motherboard caps, but a good CPU and RAM. Power supply came from a friend's junk PC that I was given when he replaced it. There's no onboard video on the DP43TF so I've got a GeForce 8800GT stuck in there for the console at the moment 8 GB DDR2 came from another junk PC someone gave me. DVD drive and WD RE4 250 GB drive were on the spare parts shelf. I updated the BIOS to the 2011 release (was the original 2008 release) which is supposed to improve stability. It's currently running OpenBSD 6.0 AMD64, with various applications deployed to it with Capistrano (manages your deploys over plain SSH). Telephoney is going to send me a less power hungry PCIe card with VGA so I can get the GeForce 8800 out of there! I've though about finding another Xeon X3360 (quad core, 12 MB cache) for the board -- that's what I originally ran in it, and it's the fastest thing it will support, but it doesn't really seem worthwhile since this box is pretty old and should be temporary anyway.
  18. Oh man, board layout with AutoCAD We had some legacy products at previous jobs where the layouts were all AutoCAD from back in the DOS days. Using a real EDA tool makes life *so* much easier!
  19. That's the approach I go with -- small, highly portable laptop, let the desktop do the heavy lifting. Works out being cheaper anyway, since you can get beefy off-lease workstations for good prices. My poor Lenovo X201 laptop is nearing retirement though!
  20. Ouch! You can tell the iMac's thermal management was definitely designed to try and keep the fans off. The ones at the office got uncomfortably hot on top before the fans would come on. I guess most iMac owners don't use them the way programmers use them, or something.
  21. Hah, true! I had a Shuttle XPC with a Core 2 era Xeon in it that would do basically all development-related tasks faster than our first gen i7 iMacs at work.
  22. Yeah, not sure what the posting of the bill is about. I can't speak for Vonage in particular, but with other ATAs like the Digium IAXy, the conversion from pulse is done in the ATA itself. In the case of the IAXy it leave as IAX (Inter-Asterisk eXchange) protocol, which encapsulated the voice stream, digits dialed, et c. I don't know if there are FXO boards that would then allow you to convert digits dialed into pulses for a line that only has pulse service, but if there was you could probably effectively do pulse in -> pulse out. If such a thing existed, you'd also end up doing DTMF in -> pulse out.
  23. Finally decided to get MPLAB X up and going on my Slackware workstation, so I can pull the SSD out of my laptop and do a clean install on a new SSD. MPLAB X is NetBeans based and mostly Java, but apparently there are some system libs that are 32-bit x86 only Up til now, I just used it on my Arch Linux install on the laptop, since Arch makes multilib pretty painless. Slackware64 is "multilib ready," but does not include multilib stuff in the base install -- this gives you a clean 64-bit Slackware. I've never needed multilib under Slackware before, turns out it's not difficult. I followed alienbob's multilib guide: Beware that the mirror he gives is *very* slow, I ended up letting it run overnight. It worked fine, and provides everything you need to run MPLAB X (some GCC libs, X libs, et c.). Decided to do a proper SlackBuild and make a package. It's not been accepted to yet but you can find it here:
  24. In August I picked up an AMD Bulldozer workstation: This was supposed to be a replacement for my AMD A8 APU desktop, but it turns out the single core performance is *horrible* and for most of my workload the A8 is actually faster. Well, the A8 box started to have hardware issues and some update had started to cause Firefox to consume massive quantities of memory if left running for too long (it'd use up all 16 GB of main memory, plus 8 GB of swap!), so I switched over to the Bulldozer box as my main workstation for a few weeks. Aside from being slower than the A8 for my day-job workload, it's *loud*! These Supermicro boxes came from a production development environment, I'm not sure how they had several of these in an open plan work area running all day. I guess everyone was deaf or wore noise cancelling headphones. It's not 1U server bad, but it's pretty loud. Anyway, I found a used HP Z420 in "barebones" config (no RAM, hard disk, or graphics) for $200 shipped. Specs: * Intel Xeon E5-1620 (i7 derivative, it seems) * 8x ECC DDR3 slots for 64GB supported (unsure if you can use 16GB DIMMs) * 10x internal SATA ports, two of which are 6 gb/s * Still has PS/2 connectors for my IBM Model M keyboard * Shockingly, FireWire 400 on the front and back * Some generic SATA DVD burner * PCIe slots: 2 x16, 1 x8, 1 x4, 1 x1 * Legacy PCI slot * USB 3 on the motherboard It can also boot directly from M.2 PCIe attached SSDs, so no more having to have a boot partition on a SATA disk, like I did with the Bulldozer box. I put the following on-hand hardware in: * 12 GB ECC DDR3 1066 * Samsung SM951 128GB SSD in a PCIe x4 adapter board * 1 TB WD Green storage drive * GeForce GTX 750 from the A8 workstation It's running Slackware 14.2, still have a boot partition on the 1 TB SATA disk since I just pulled the storage out of the Bulldozer box and moved it over. I plan on doing a reinstall and eliminating the 1 TB mechanical disk. I'll probably replace with two 250 GB WD RE3 SATA drives in a ZFS mirror -- I don't need piles of local storage, that's what the fileserver is for. So far it's significantly faster than both the Bulldozer box and the A8 box -- my main benchmark is how long a certain massive test suite takes to run. It was about 20 minutes on the A8 box, 30 minutes on the Bulldozer box, and 17 minutes on the Z420. I've ordered 32 GB ECC DDR3 so that the memory currently installed can go back into the Bulldozer box -- I have a friend who's interested in it as a VM host. Thinking about getting a 256 GB M.2 SSD and reinstalling to that, I could use the 128 GB SSD elsewhere. Part of the reason I got this box is because it was cheaper than getting a new SuperMicro motherboard for my Micro ATX tower (the one the A8 mobo is in currently), and the SuperMicro board obviously didn't come with a CPU. Also it has enough free PCIe slots that I can use a M.2 SSD, the double slot GTX 750, and still have a free x8 or better slot for a 10gig Ethernet card. I may end up with a Xeon E5-1660 v2 CPU in there, the single-core performance is better and two extra cores (plus 2 hyperthreads) couldn't hurt with my VM load.
  25. Slackware 14.2 was released over the weekend (2016-07-01), downloading now! Got my DVD copy on order, too. Anyone else still running Slackware?