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• switchless Infiniband between two servers on RHEL 6.3

  - by exfizik

  I have 2 servers running RHEL 6.3 which have 2 port Infiniband cards >lspci | grep -i infini 07:00.0 InfiniBand: QLogic Corp. IBA7322 QDR InfiniBand HCA (rev 02) I'm interested in connecting them directly to each other bypassing an Infiniband switch (which I don't have). Quick googling showed that at least in some configurations it's possible. I installed all RedHat Infiniband packages with yum groupinstall "Infiniband Support". However, ibv_devinfo shows that both ports in each card are down, which indicates that cables are not connected. But the cable is connected, although the LEDs are off on the cards (not a good sign). Another source of confusion for me is that according to this, RedHat doesn't come with OFED packages and I'm slightly hesitant to install them from source due to the lack of RedHat support for them... So where am I going with this? The questions I have are: is it possible to have a switchless/direct Infiniband connection between two servers the way I described above? If it's possible, do I have to use the OFED packages or can I configure everything with just the packages coming with RHEL. Why are the LEDs off on my servers even though the cable is connected? Any additional input/advice/pointers would be appreciated. P.S. I followed this guide for installation instructions. The Infiniband cards are clearly recognized by my OS and the rdma service is running. Update: I have opensm installed. When I run it it says: OpenSM 3.3.13 Command Line Arguments: Log File: /var/log/opensm.log ------------------------------------------------- OpenSM 3.3.13 Entering DISCOVERING state Using default GUID 0x1175000076e4c8 SM port is down and stays at that point.

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• Howo to get Multipath IO with Dell MD3600i into active/active setup?

  - by Disco

  I'm desperately trying to improve performance of my SAN connection. Here's what i have: [root@xnode1 dell]# multipath -ll mpath1 (36d4ae520009bd7cc0000030e4fe8230b) dm-2 DELL,MD36xxi [size=5.5T][features=3 queue_if_no_path pg_init_retries 50][hwhandler=1 rdac][rw] \_ round-robin 0 [prio=200][active] \_ 18:0:0:0 sdb 8:16 [active][ready] \_ 19:0:0:0 sdd 8:48 [active][ghost] \_ 20:0:0:0 sdf 8:80 [active][ghost] \_ 21:0:0:0 sdh 8:112 [active][ready] And multipath.conf : defaults { udev_dir /dev polling_interval 5 prio_callout none rr_min_io 100 max_fds 8192 user_friendly_names yes path_grouping_policy multibus default_features "1 fail_if_no_path" } blacklist { device { vendor "*" product "Universal Xport" } } devices { device { vendor "DELL" product "MD36xxi" path_checker rdac path_selector "round-robin 0" hardware_handler "1 rdac" failback immediate features "2 pg_init_retries 50" no_path_retry 30 rr_min_io 100 prio_callout "/sbin/mpath_prio_rdac /dev/%n" } } And sessions. [root@xnode1 dell]# iscsiadm -m session tcp: [13] 10.0.51.220:3260,1 iqn.1984-05.com.dell:powervault.md3600i.6d4ae520009bd7cc000000004fd7507c tcp: [14] 10.0.50.221:3260,2 iqn.1984-05.com.dell:powervault.md3600i.6d4ae520009bd7cc000000004fd7507c tcp: [15] 10.0.51.221:3260,2 iqn.1984-05.com.dell:powervault.md3600i.6d4ae520009bd7cc000000004fd7507c tcp: [16] 10.0.50.220:3260,1 iqn.1984-05.com.dell:powervault.md3600i.6d4ae520009bd7cc000000004fd7507c I'm getting very poor read performance : dd if=/dev/mapper/mpath1 of=/dev/null bs=1M count=1000 The SAN is configured as follows: CTRL0,PORT0 : 10.0.50.220 CTRL0,PORT1 : 10.0.50.221 CTRL1,PORT0 : 10.0.51.220 CTRL1,PORT1 : 10.0.51.221 And on the host : IF0 : 10.0.50.1 IF1 : 10.0.51.1 (Dual 10GbE Ethernet Card Intel DA2) It's connected to a 10gbE switch dedicated for SAN traffic. My questions being; why the connection is set up as 'ghost' and not 'ready' like an active/active configuration ?

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• Run Explorer in SYSTEM account on Windows Vista or 7 using Sysinternal’s psexec tool?

  - by Rob

  Has anyone been successful at launching an instance of Windows Explorer in the SYSTEM account on Windows Vista or 7? It is possible to do this on XP, but I haven't been able to get it to completely work in Vista or 7. Trying to launch Explorer as SYSTEM into session 1 (my user session) results in Explorer exiting immediately and returning an error code of 1. I can launch Explorer as SYSTEM into session 0 with the following command: psexec -i 0 -s explorer That will create an instance of explorer running as SYSTEM with a taskbar and start menu on the hidden session 0 desktop, but won't let you open a file browser window. If you switch to the hidden session 0 desktop and try to open an Explorer window from there to browse files, the following error message appears: "The server process could not be started because the configured identity is incorrect. Check the username and password." I have set the following registry key to 1 for my user account and the SYSTEM account: \Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\SeparateProcess There has got to be a way to make this work? If it is not possible, can anyone explain why? -Rob

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• client flips between internal and external IP addresses??

  - by jmiller-miramontes

  I have what seems like a not-particularly-complicated home network, all things considered: a DSL line comes in to a modem/router, which goes off to a switch, which supports a bunch of machines. My machines live in a 192.168.0.x address space; however, I'm running some public servers on the network, so I have a block of 8 (5, really) static IP addresses that are mapped to the servers by the router. The non-servers get 192.168.0.x addresses via NAT; some machines have static addresses and some get addresses from DHCP. Locally, I'm running a DNS server (named) to map between the domain names and the 192.168 address space. Somewhat messy, but everything basically works. Except: One of my local non-server clients occasionally switches from its internal address to its external address. That is, if I check the logs of a website I'm running internally, the hits coming from this client sometimes show up with the internal 192.168 address, and sometimes with the external (216.103...) address. It will flip back and forth for no apparent reason, without my doing anything. This can be a problem in terms of how the clients interact with the way I have some of the clients' SSH systems configured (e.g., allowing access from the internal network but not the external network), but it also Just Seems Wrong. I will confess that I'm kinda skating on the very edge of my networking competence here, but I can't for the life of me figure out what's going on. If it helps, the client in question is running Mac OS X / 10.6; its address is statically assigned, is not one of the five externally-accessible addresses, and gets its DNS from (first) the internal DNS server and (second) my ISP's DNS servers. I can't swear that none of the other NAT clients are also showing this problem; the one I'm dealing with is my everyday machine, so this is where I run into it. Does anybody out there have any advice? This is driving me crazy...

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• Can't find standalone Chrome Gmail client that I know exists

  - by Carson

  I'm on Windows. A couple years ago when I switched from Outlook to Gmail (Google Apps), Google provided this awesome little standalone gmail client that was just a single-purpose Chrome install. It launched like a normal application, stayed updated when I updated Chrome. It was Chrome in a separate application that launched only gmail, stayed logged in really well, and "felt" like a gmail mail client, with the gmail interface. It had it's own little red envelope icon, it was a windows app. (I remember there was no Mac equivalent.) I found it while looking through the "this is how you get your company to switch to gmail" documentation that Google provided. I just repaved my box and now I'm looking for this thing again, and I had no idea it would be impossible to find. I've spent literally 2 hours looking, searching, googling, etc. I'm losing my mind. Anyone know how I can get my hands on this? I used it all day every day for 2 years, so I know it exists :), but I can not find it. Any assistance would be gratefully received.

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• Netcat (nc) traditional package for RHEL 6.x?

  - by HTTP500

  I'm trying to use the Percona Apache Monitoring [Cacti] Template for Memcached. They do indeed warn that you can't use the openbsd version of the package and provide a solution for Ubuntu/Debian users, i.e.: You need nc on the server. Some versions of nc accept different command-line options. You can change the options used by configuring the PHP script. If you don’t want to do this for some reason, then you can install a version of nc that conforms to the expectations coded in the script’s default configuration instead. On Debian/Ubuntu, netcat-openbsd does not work, so you need the netcat-traditional package, and you need to switch to /bin/nc.traditional... Since the RHEL 6.x version indeed comes from openbsd (confirmed by rpm -qi nc) how does one go about getting this installed on RHEL/CentOS? Anyone else running these Percona templates on RHEL/CentOS? What did you do? alien the Debian package? Update 1: FWIW, I tried to use GNU netcat by compiling it from source but it doesn't seem to have the exact options required by the Cacti template either (i.e. there is no analogy for -C or -q1 so it seems) Update 2: I alien[ed] the netcat-traditional_1.10-38_amd64.deb package to make a .tgz and it does produce a binary "nc.traditional" and that version has the -q option but no -C Cheers

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• SMB access from XP to Windows 2008 R2

  - by Pablo

  Here's the thing... I have a very slow file copy performance from Windows XP clients to Windows 2008R2 servers. Here are the facts: Windows XP to Windows 2K3: Fast Windows XP to Windows 2K8: Very Slow Windows 7 to Windows (any): Fast Despite the fact that the obvious solution would be to upgrade to Windows 7, well, we have 900 desktops so it's not an option in the short time. I have tried everything: Disabling SMB2.0, disabling security signatures, changing the TCP Window size, disabling the W2K8 auto tuning, upgraded the drivers, etc. We eliminated the network; both the server and the client are connected to the same core switch (no hops, no routers, same VLAN). Upon monitoring the network with a packet capture utility, we see that the SMB packets being exchanged between the W2K8 and the XP machines are very small packets (256 bytes); despite the fact that the MTUs are properly set (1500) and there is no fragmentation whatsoever. In fact, those SMB packets show, on the IP datagram, that the window is 65535 or close. The same trace, made using the same application but instead of using a W2K8 share uses a Windows XP share (and that goes FAST) shows SMB packets of 4096 bytes. I can post the traces if necessary. So, why does XP-W2K8 negotiation arrange for 24-bytes SMB payload, whereas the XP-XP negotiation arranges for 4096 SMB packets? Any ideas? I am running short of those...

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• Finding a backup and synchronization solution

  - by Andrea Zilio

  I'm having difficulties to find a backup and synchronization solution with the following characteristics: Cross-platform: Windows, Linux, Mac Offsite backup (so Internet Backup) Data deduplication Transfer only new/modified bits of modified files Secure: Data encrypted before leaving computer Maintain multiple versions of files (even deleted files) Folder synchronization integrated with backup and across multiple computers connected to the internet (not necessarily in the same LAN) I think that the Folder Sync feature needs a better explanation. The use case is this: you have a desktop pc and a laptop. The desktop pc contains a folder with some files and this folder is part of the backup (so it was selected to be backed up). The laptop does not contain that folder or that files at all. Then you're abroad with your laptop and you need that folder. So you want to be able to open the backup program, select that folder from the backup and download it in your laptop mantaining it synchronized with the backed up version. When you then come back home and switch on your desktop pc you want the folder we're talking about to be updated in the desktop PC. Does anyone knows any service with all these features? I've only found SpiderOak to support all the features I've mentioned but I'm not completely satisfied by the time taken to complete a backup. Sometimes it seems to hang for minutes with no reasons at all and folder synchronization occurs only after all files are backed up (instead folder sync should have a separated queue independent from other backup operations and synchronization should occurs frequently... for example every 5 minutes or less, independently from the frequency of normal backup operations)

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• Need to link WP Blog with Rails App on Heroku

  - by John Glass

  I have a client who wants to migrate his Rails app to Heroku. However the client also has a blog associated with his domain that runs on WordPress. Currently, the WordPress blog is running happily alongside the Rails app, but once we migrate to Heroku, that clearly won't be possible. The url for the app is like http://mydomain.com, and the url for the blog is like http://mydomain/blog. I realize that the best long-term solution is to redo the blog in a Rails format like Toto or Jekyll. But in the short term, what is the best way to continue hosting the WP blog where it is (or somewhere) but use Heroku to run the app? The client doesn't want the blog to be on a subdomain, but to remain at mydomain/blog for SEO reasons and also since there is traffic to the blog. I have two ideas: Use rack_rewrite or refraction (or just a regular old 301 and Apache mod_rewrite) on the old (non-Heroku) server to redirect the main url from the old site to Heroku. In this case, I can just leave the Wordpress blog running happily where it is. I think?? Is there a reason to choose one of those options (rack_rewrite, refraction, or mod_rewrite) over the others if I do it this way? Switch the DNS info to point to the Heroku site, and then use a 301 redirect from the blog to the old site. But then I'll have to get the old (non-Heroku) site on a subdomain and use some kind of rewrite rules anyway so it looks like it isn't a subdomain. Are either of these approaches preferable, or is there another way to do it that's easier that I'm missing?

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• Arch linux - strange behaviour after installing fglrx

  - by kosto

  I have a problem with drivers on arch linux. I installed catalyst through unnoficial catalyst repo as wiki says. pacman -S catalyst catalyst-utils aticonfig --initial After this operation i rebooted the system. KDM loaded succesfully, but when i tried to switch to console (ctrl+alt+1/2/3) i saw only some strange dots, like pixels from the text were splitted on the whole screen. I was able to go back to kdm and enter the account details tho. This gave me a hang just before kde loaded. Here's a video where i'm showing above actions. Anybody knows what caused the problem? I can still chroot to fix some issues. Thanks for interest. http://glothriel.org/arch/arch_problem.ogg same thing on gnome / gdm, that's my second try on installing catalyst on arch. Open drivers suck the battery 2x faster. ___________EDIT_____________ Ok, i found a sollution, so i'm posting if someone else shares my problem. Catalyst does not support KMS, so you need to disable it from grub. You must know where are your /etc and /boot paritions mounted. If you have only one partition for / it's even simplier. Mount / on /mnt mount /dev/sdaX /mnt where X is number of the partition where is your / installed arch-chroot /mnt nano /etc/default/grub and add line: GRUB_CMDLINE_LINUX="nomodeset" save and quit then run (this will delete your windows grub configuration) grub-mkconfig -o /boot/grub/grub.cfg exit umount /mnt reboot

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• How does the EFI partition work and can I boot an x86 OS with a bootx64.efi file?

  - by Ian

  I have a Thinkpad X230 laptop and I want to install Linux Mint Debian Edition along side Windows 7 on my GPT formatted SSD with the BIOS in UEFI mode. The problem is that I don't understand how EFI booting works. There seems to be an EFI partition involved with some folders and binary files in it. GRUB 2 seems to be able to make more folders in it (I followed this guide http://www.thinkwiki.org/wiki/UEFI_Firmware), but it appears that the only file that does anything is the bootx64.efi file in the /efi/boot folder of the EFI partition (I am not sure if this is always the case, but it appears to be the case for my laptop http://www.thinkwiki.org/wiki/Category:X220). Here is what I have been able to do: I can install Linux Mint Debian Edition x86 with the BIOS in BIOS mode on my SSD. I can then install grub-efi and follow the guide linked above. The problem is that I don't get a GRUB prompt when I switch the BIOS to UEFI mode. It just boots Windows. It appears that I can either boot from the SSD or something called "Windows Boot Manager". If I replace the bootx64.efi with the file created by GRUB, I can no longer boot directly from the SSD. Booting from "Windows Boot Manager" still works fine. I realize that the guide says to use x64 Linux, but Linux Mint Debian Edition x64 hangs during the install process. I am really confused. What should I do? Can anyone explain how the EFI boot partition works? Can a bootx64.efi boot an x86 OS? Should I just give up with using UEFI? I haven't been able to find very much useful information about using Debian based operating systems with UEFI. Thanks, Ian

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• Multiple cable adapter setup not working - VGA to smartphone. All cables tested and work

  - by Christopher Rucinski

  Issue Pictured overhead projector setup does not work. #1 - #2 - #3 - Phone. All cables are tested and work! The issue is the HDMI connection between cable #2 and #3. With all other cables, the screen will automatically be displayed onto the projector screen. No extra work needed. With the pictured setup, the smartphone screen is not displayed onto the projector screen. What is the issue with the HDMI connection?? Background We recently had to do presentations at work (school), but the administration only provided VGA means of hooking up to it. Mostly likely reason probably dealt with cost. Anyways, there are several teachers that have brand new Samsung Series 9 ultrabooks (or similar). You know, the ones without VGA support. So I bought an adapter for those ultrabooks. Cable #5 in the picture below. However, both my coworker and I have been wanting to just display our phone screens on the projector. This I knew would require some extra work. What I have VGA cable to projector (cables go through the wall) For laptops HDMI to VGA cable For laptops MHL adapter For 11-pin microUSB phones microHDMI to VGA cable For ultrabooks 11-pin to 5-pin microUSB adapter For older 5-pin microUSB phones) Equipment Projectors 1 projector with VGA and HDMI input (issue is coworkers forget to switch sources) 1 projector with VGA only input Laptops 2 new Samsung ultrabooks w/o VGA or HDMI support 1 ultrabook with VGA and HDMI support several other laptops with at least VGA support 1 tablet with 11-pin microUSB at least 1 new phone with 11-pin microUSB at least 1 old phone with 5-pin microUSB Tested VGA cable (#1) to laptop Good VGA cable (#1) to HDMI adapter (#2) to laptop Good VGA cable (#1) to microHDMI adapter (#5) to laptop Good Projector to HDMI cable (not shown) to MHL adapter (#3) to Galaxy Note 3 smartphone Good VGA cable (#1) to HDMI adapter (#2) to MHL adapter (#3) to Galaxy Note 3 smartphone Does not work!! Extra Notes The 11-pin MHL adapter will not fit inside the 11-pin to 5-pin microUSB adapter so older phones can be displayed on the screen.

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• sorry, the maximum allowed clients from your host (10) are already connected" FTP error

  - by Sejanus

  Hello, I keep getting the "sorry, the maximum allowed clients from your host (10) are already connected" error whenever I try to transfer a large number of files. At first I thought it's a filezilla bug, however I get the same error basically with every FTP client I've tried, including Total Commander under Wine. I do not get that error using Windows. I did try to limit maximum allowed connections for Filezilla, both in server settings and in global settings, it didnt change anything. I did try to switch between passive and active modes (not sure if it's related at all, just last desperate attempt), and it didnt change anything either. When I try to use native ftp client (not sure how is it called, the one in Places - Connect to a server) I get abstract "connection refused" error every time I transfer large number of files. Connection is refused for separate particular files, if I click "Ignore" each time the rest of files are transfered perfectly well, so I assume it's the very same error. Anything I could do? This really drives me mad, transfering large numbers of files is a part of my everyday job... P.S. and this happens with many different FTP servers. Also I dont get this error in Windows. So I assume it's not a server problem. P.P.S. I am aware of similar question here, the answer provided just didn't solve it to me.

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• Powershell: Execute exe on remote server and capture output

  - by user364825

  I am trying to script the execution of an installer on remote web servers. The installer in question is also a Windows Service that hosts NServiceBus. If RDP'd into the server, the application is installed by the following command: &"$theInstaller" /install /serviceName:TheServiceName The installer prints output about its progress registering the service and connecting to the database to stdout, among other things. This works fine from an RDP session, but when I execute it remotely via PS, I get a you-can't-do-this-over-the-network message if I execute it directly or via Invoke-Command -computername $theRemoteServer: System.IO.FileLoadException: Could not load file or assembly 'file://\\theRemoteServer\c$ \thePath\AutoMapper.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515) --- System.NotSupportedException: An attempt was made to load an assembly from a network location which would have caused the assembly to be sandboxed in previous versions of the .NET Framework. This release of the .NET Framework does not enable CAS policy by default, so this load may be dangerous. If this load is not intended to sandbox the assembly, please enable the loadFromRemoteSources switch. See http://go.microsoft.com/fwlink/?LinkId=155569 for more information. (Note: I added an additional "\" to the path in the first line in order to get it to show up correctly in the preview on this site.) This, and other DLLs, are loaded by the service, and the service's execution context cannot, apparently, be remotified. I have also tried using Invoke-WmiMethod, which does something, but it's not clear what, and the output from the installer is lost: Invoke-WMIMethod win32_process create '"$theInstaller" /install /serviceName:TheServiceName' -ComputerName $server (with and without cmd.exe /k before the intaller reference): __GENUS : 2 __CLASS : __PARAMETERS __SUPERCLASS : __DYNASTY : __PARAMETERS __RELPATH : __PROPERTY_COUNT : 2 __DERIVATION : {} __SERVER : __NAMESPACE : __PATH : ProcessId : ReturnValue : 9 How does one remotely execute such an EXE and capture the output? Thanks!

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• Automatically install driver on headless WHSv1 system

  - by Dan Neely

  I have one of the HP Mediasmart Windows Home Server v1 boxes. It's network port appears to have died a few days ago but the system is not giving any other sign of failure: No activity lights activate on either side of the cable when connected to my gigabit switch; when connected to one of my routers 100 megabit ports the lights turn on but it remains unreachable over the network and my router never lists it as among DHCP clients. I bought a USB-ethernet adapter to temporarily get it back online; but the adapter needs a driver to work which I can't install because the system is headless by design (no video out, no PCI/PCIe slots) with admin access only available via the WHS client or remote desktop. Both of those options require network connectivity and are consequently unavailable. I tried copying the drivers to a flash drive; but Windows either didn't look there or none of the drivers provided were suitable (Win8, Win7, or combined XP and Vista). I've been told that a USB WiFi adapter would have the same driver problem.

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• Sync desktop Mac environment to laptop

  - by Andrew Vit

  I spend the majority of my time working at my desktop Mac, which I have configured for my web development environment. My spouse has a MacBook for casual use, and I occasionally steal it back when I need to work off-site, or when travelling. The question is how to best synchronize the two so I can switch between them more readily. I've solved a few obvious things by using online services: Email is hosted on IMAP. Working files are in Dropbox. Source code is managed in git. However, the following are things I always miss when jumping on the laptop: Installed Applications (current versions) Installed libraries & utilities (/usr/local) Apache VirtualHosts & other configurations (/etc) Disk image files for VMs My current method is to connect the MacBook via Firewire target mode and rsync the /Users/me home directory, and then cherry-pick the other items I need from Applications, /etc and /usr/local. The problem with this method is that it can be very time consuming due to things like my virtual machine image files, cached emails, etc. How can I make this faster & easier? Can you recommend a solution for configuration management (so I can repeatably install & configure the same software on both), or synchronization (so I can bring the MacBook up to date nightly, over our home network)?

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• Windows 7 - "A disk read error occured. Press Ctrl + Alt + Del to restart"

  - by Senthil

  Problem: When I switch on my PC, after BIOS POST, a cursor is blinking for about 5 seconds and then I am getting this error message: A disk read error occurred. Press Ctrl + Alt + Del to restart. I am able to go into BIOS. But Windows loader doesn't even start. This message is shown after my motherboard logo comes and goes. Symptoms: I DID notice my system freezing for minutes at a time for past two days. Also, in the past two days, it stopped half way through the Window booting process. I had to do hard reset couple of times to get it working. But since today morning, I only get this error message. Configuration: Operating System: Windows 7 Ultimate 32-bit only. Hard disk: 1 Physical Disk - 80GB SATA Partitions: Two (2) - C: and D: File System: NTFS No drive encryption or compression is turned on. After I searched on the net, I have found people mentioning these possible causes: Hard Disk is physically failing Corrupt MBR Bad Sector I am planning to buy a new hard disk, install Windows on it and continue. But I need data from the old hard disk. The data I want is in D: drive, outside any Windows user folder, is not encrypted or compressed or protected in anyway. I think if someone/something can get the disk working again and knows NTFS, the data can be hopefully read. What steps should I follow to recover files from the defective disk? Update: I bought a new disk, installed windows on it and added the defective one as a slave. Then I was able to read the data from the defective hard disk. Though chkdsk found lots of errors, the files I wanted were not affected and I got them back :) I am not using that hard disk anymore though it seems to be working at the moment.

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• Can I make two wireless routers communicate using the wireless?

  - by Dana Robinson

  I want to make a setup like this: cable modem <-cable- wireless router 1 <-wireless- wireless router 2 in another room <-cables- PCs in another room Basically, I want to extend my network access across the house and then have a bunch of network jacks available for my office PCs. Right now, I have a cable modem going to a wireless router in one room and a PC with a wireless PCI card in it in the office on the other side of the house. I use internet connection sharing with the other PCs in the office. The problem is that ICS is flaky, especially when I switch to VPN on the Windows box to access files at work. I picked up a wireless USB adapter that I thought I could share among the PCs I work on but I'm not very happy with it so I'm going to return it (NDISwrapper support for it is poor). Is this possible? My wireless experience so far has been pretty straightforward so I have no idea what kind of hardware is available. I've looked at network extenders but those just look like repeaters for signal strength. I want wired network jacks in my office.

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• Windows Server 2003 DHCP not handing out IPs

  - by SnOrfus

  I'm trying to setup a home server (to tinker with) as a domain controller. I've setup the domain and I've installed DHCP and setup a scope without any exclusions (with the default range of 192.168.0.1-254). My client machine is a Windows 7 (RC) machine and it has a connection but can't get an IP address. Even if I try setting the IP to a static 192.168.0.2 and there is still no connectivity. I can ping it from the server, but pinging the server from the client just times out. The only thing between the server and the client is a 24 port switch (D-Link DES-1024D). edit Ok, it turned out that the interfaces were setup backwards in the NAT settings (the internal nic connection was set to public and the external nic connection was set to private). I changed this and all was OK.... sort-of. Problem is now: If I set a static ip on the client (where I am typing this from) all is fine. BUT; when I set it to get it from DHCP, I get a correct IP from the server (192.168.0.2) but there is no internet on the client; but I can still ping the server fine from the client (which makes sense cause I was able to get an IP from it). edit I ended up just removing the Routing and DHCP server roles and just going with ICS for the time being until I get my hands on some better learning tools.

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• What is the correct iptables rule when NATing multiple private subnets?

  - by Jose Mendez

  I have a Centos minimal 6.5 acting as a router. eth0 is connected to a Cisco switch trunk port, allowing VLANs 200-213. I have several VLAN interfaces just as this link suggests: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/s2-networkscripts-interfaces_802.1q-vlan-tagging.html And have IPv4 forwarding, so all my network devices from any of the networks 200-213 can communicate with each other using this linux box as their router. Problem is, I need them to access the Internet, so I added the following rule: iptables -t nat -A POSTROUTING -s 192.168.0.0/16 -j SNAT --to 1.1.1.56 1.1.1.56 is the "outside" address. This works fine, devices connected to the internal networks can ping Intertnet addresses BUT, they stop being able to talk to each other across subnets, so 192.168.211.55 can ping 8.8.8.8, but can't talk to 192.168.213.5. As soon as I do a service iptables restart to remove the rule, I can start talking across internal subnets again. What would be the correct way to set up NAT for multiple private subnets? Or maybe the correct way to set up forwarding?

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• How do I stop MSYS from transforming my compiler options?

  - by Carl Norum

  Is there a way to stop MSYS/MinGW from transforming what it thinks are paths on my command lines? I have a project that's using nmake & Microsoft Visual Studio 2003 (yeecccch). I have the build system all ported and ready to go for GNU make (and tested with Cygwin). Something weird is happening to my compiler flags when I try to compile in an MSYS environment, though. Here's a simplified example: $ cl /nologo Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 13.10.6030 for 80x86 Copyright (C) Microsoft Corporation. All rights reserved. /out:nologo.exe C:/msys/1.0/nologo LINK : fatal error LNK1181: cannot open input file 'C:/msys/1.0/nologo.obj' As you can see, MSYS is transforming the /nologo compiler switch into a windows path, and then sending that to the compiler. I really don't want this to happen - in fact I'd be happy if MSYS never transformed any paths - my build system had to take care of all that when I first ported to Cygwin. Is there a way to make that happen? It does work to change the command to $ cl -nologo Which produces the expected results, but this build system is very large and very painful to update. I really don't want to have to go in and change every use of a / for a flag to a -. In particular, there may be tools that don't support the use of the - at all, and then I'll really be stuck. Thanks for any suggestions!

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• Cisco SA520 to Adtran 1234 no DHCP transfer

  - by Grico

  I am trying to set up a Cisco SA520 to run DHCP on my network. I have a vendor provided switch, the Adtran 1234, and it provides DHCP for our phone systems on VLAN 200. I do not have access to the Adtran, but the vendor gave me a IP on port 1 for WAN and said port 2 should be for the "trust" side should go. I did setup a mini lab where, Adtran 1 went to SA520 WAN port, and SA520 trust 1 went to my laptop. Everything worked fine, I could ping and get internet using the DHCP scope I put on the SA520. I then unplugged my computer from SA520 trust 1 and plugged it into Adtran 2. I plugged my computer into Adtran 23 and I dont get DHCP or even a link light. If I restart my machine, I get a brief link and then it dies once the machine boots. I have tried several ports on the Adtran and none seem to work. Different cables as well. However, when I plug a phone into the Adtran, the phone boot immediately and shows link. Thoughts?

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• Completely automated DVD insert-rip-compress-eject workflow

  - by Kevin L.

  (Partially inspired by this question.) Background: I have a PC hidden away behind an HD LCD in custom-built entertainment center. The only visible part of the PC is an external DVD drive, mounted above the Wii. The PC happens to have Windows XP on it; Hackintoshing and Linux might be possible, but I've had issues with drivers for the sound card before. Let's just assume that OS X and Linux are a no-go unless they provide a truly awesome and simple solution for this particular problem. Goal: I would like to have a completely automated workflow for ripping DVDs. Something like this: Push the eject button on the DVD drive, insert the DVD. PC recognizes that this is a video DVD (as opposed to data). PC rips DVD to hard drive. PC finishes ripping, and ejects the DVD tray. PC compresses DVD image into some format that an Xbox 360 can read. PC copies finished compressed video file to a particular folder, so that it can be read into a WMP11 library and seamlessly played by the Xbox 360. PC cleans up all temporary files. Done. The impetus to have this be completely automated is that I’ll never need to switch the TV to the PC’s input and fiddle with the wireless keyboard. That’s just needless user intervention. The UI doesn’t have to be pretty. Nor do I care about speed. And I can probably bridge several of the gaps with some creative Perl use. But it seems likely that many (or all) of the parts should already exist. Any thoughts?

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• Routing WIFI and LAN for specific traffic

  - by jakebird451

  I have two network devices aboard my macbook pro: WIFI (en1): Used for general traffic. Connects to an ip of 192.168.19.* via DHCP LAN (en0): Used for specific traffic. Connects to an ip of 192.168.2.10 as a static IP. Does not connect to a router, only a switch for direct routing connection. I have 4 IP addresses I need to access on the LAN: 192.168.2.1 192.168.2.21 192.168.2.20 192.168.2.30 The rest of the traffic needs to go to WIFI. I have tried setting up a routing table for the specific ip addresses, but I only managed to mess up my network. I do not venture out into the world of networking too often, but this was the latest command I have been trying: sudo route add -host 192.168.2.30 -interface en0 This command killed my ability to use ping. It told me that ping could not allocate memory (is that even possible)? It also killed my wifi access. Logging out and back in fixed the issue. I really do not mind to make this solution permanent, so I am fine with a temporary routing. EDIT: If I currently have been trying: sudo route flush sudo route add default 192.168.19.1 This gets everything to work for about a minute. But after such minute it "forgets" the routing to WiFi while retaining LAN's (en0) routing. If I unplug and replug my LAN (en0) cable, the process works for another minute.

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• Force SSL on one page via .htaccess without looping

  - by Will Martin

  Okay, I have this code: RewriteCond %{HTTPS} off RewriteCond %{REQUEST_URI} ^/borrowing/ill/request\.php$ RewriteRule ^.*$ https://%{HTTP_HOST}%{REQUEST_URI} [R,L] The way I would expect this to work is: A request for /borrowing/ill/request.php comes in on HTTP. The rule matches. The server redirects to HTTPS. The rule does not match, because HTTPS is now on. The way it actually works is: A request for /borrowing/ill/request.php comes in on HTTP. The rule matches. The server redirects to HTTPS. The rule matches. The server redirects to HTTPS. The rule matches. The server redirects to HTTPS ... And so on. I know that the second condition (matching the file name) is working, because the redirect loop only hits that specific page. The question is, why isn't the switch to HTTPS causing the first condition to not match? EDIT: I put the exact same .htaccess rules into a test area on another server -- same file and path info. And they worked just fine. There's got to be something wrong with the server configuration elsewhere.

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