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• Connecting a laptop to a TV via HDMI

  - by Madmartigan

  I just bought a new Dell XPS17 laptop (Win7) that only has HDMI output. My last 2 laptops had VGA, which I used to connect to my Sony Bravia 32" TV with no issues, but with the HDMI it's been quite a headache. Drivers for display adapters have been updated to the latest versions: Intel(R) HD Graphics Family NVIDIA GeForce GT 550M I went to a store and plugged in to 4 different TVs from different manufacturers. A sales rep and I spent about 30 minutes being baffled by the results (which are the same as my current TV): Extreme buggy behavior in the Nvidia and Windows display/resolution control panel Can not extend or duplicate displays, can only select one Third and fourth output devices "randomly" detected by the Windows control panel Could not get the screen to fit the output (edges cut off on all sides by about a half inch) Resolution and colors less than perfect. Artifacts around text. Display "randomly" cuts out Defaults to TV output only when plugged in Can not change resolution on either device when connected No audio from the TV Plugged in to 3 monitors from different manufacturers: Defaults to duplicated displays when plugged in Everything works perfectly So far, four people have gone through all the settings in the latop with no luck. I had similar, but not exactly matching results with a different laptop. I'm using the Sony Bravia currently at home, but in order to get it to work I have to turn on the laptop, wait until the display shows up on it, close the lid, then cycle through each output channel on the TV until I come back around to the HDMI port again, but still I have the symptoms described above. However: Once in a while, it just works. Sometimes, seemingly randomly, the output fits the screen perfectly. Sometimes the audio comes through the speakers too, but not always. Usually my screen saver "Mystify" will come up with a message that it cannot be displayed due to a limitation of the video card, but then sometimes it works fine. These 3 things seem to be independent of each other and don't always happen together. So, is there any way to get the laptop to output correctly to a TV, or is it just not meant to be?

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• Router vs switch in a LAN [closed]

  - by servernewbie

  If I have a LAN and and connect it with a switch, I understand it uses a CAM table to route packets in layer 2 (by saving mac to port relations). So far all good. However, when using a router for a LAN (ONLY for a LAN, not to connect it to "the outside" WAN/internet/etc) I get a bit confused as to how it internally processes packets. I would first split this into two router scenarios: Router with buit-in switch In this scenario, I would expect that it will act exactly as a switch with a CAM table internally. This would probably benefit a bit in speed (guessing here?) compared to the next option. Router without built-in switch Here is where I get confused. If hostA wants to send a packet to hostB, it will ARP to find hostB's MAC address and send it there. Now, if we had a switch (above scenario) this would be easy. But how does it work now in a router WITHOUT a switch? If I would guess, hostA would send an Ethernet frame with hostB's MAC address to the line. The router would fetch the packet (even though the router has another MAC address, it would still fetch this packet even if it only contains hostB's MAC address). It would strip the Ethernet frame header and check the IP, and then check its own internal ARP table again for the MAC address. Now, this would seem like a waste of resources compared to a router with a built-in switch. But maybe it does not work like that at all. Does it also contain a CAM table? If that would be true, what would then the difference between these two routers really be?

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• Why do I need to set up Autologon values in registry twice before it works and can i fix this?

  - by jJack

  Background: As part an automated testing suite I am building, I need to set up Autologon on my virtual machines 'on demand'. By on demand, I mean that I don't want to necessarily pre-configure my VM or any snapshot to have Autologon set up already, for security reasons and also a huge business case. My solution so far: I'm copying a script to the guest machine and then using Sysinternals PsExec to execute it. The script is: reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v DefaultUserName /t REG_SZ /d myusername reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v DefaultPassword /t REG_SZ /d myfakepassword reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v DefaultDomainName /t REG_SZ /d mydomain reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v ForceAutoLogon /t REG_SZ /d 1 reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v AutoAdminLogon /t REG_SZ /d 1 reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoLogonChecked" /f /ve /d 1 Note: I don't believe AutoLogonChecked is required for machines post Windows 2000 but I'm doing it just in case for now. Maybe ForceAutoLogon isn't either, not sure yet. The Problem: I see PsExec executes this properly and all the values are in the registry, however when I restart the machine, the user isn't automatically logged on...When I run this a second time then restart the machine, the user is finally logged on. A diff between the registry states shows that the first time I run this, it is missing both the "1" for AutoAdminLogon, and also the DefaultPassword key. The second time I execute it, these values are correctly intact as I intended. So, what is going on here? Is this expected? This post claims in the end that it really all just works (the problem was that a logoff script was setting off the values). Doesn't seem to work for me however.

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• Firefox: Unload a tab manually

  - by unor

  Firefox has a setting "Don't load tabs until selected" (see How do I make Firefox 13 Load All My Tabs on Startup or when Resuming Reload). I like that behaviour. I am searching for a way to "deload"/deactivate a tab manually for a session (until I reload it). It should stop all running JavaScript functions and plugins (like Flash). The whole webpage content may disappear until I reload/re-activate the tab, but that is not a requirement. The title has to be displayed as tab label (like it is the case with the startup setting, too). The workaround would be to restart Firefox and don't switch to the tab I want to be deactivated. This is pretty annoying, of course. EDIT: Here is what I found so far (thanks, @bytebuster!) BarTab no longer being maintained (see why) BarTab Lite seems to miss this functionality from BarTab Dormancy experimental; comes with warning that it "may eat your session" Tab Mix Plus Feature request: Unload Tab feature Tab Utilites seems to offer this functionality only for automatic unloading Feature request: Add "unload tab" to tab context menu. UnloadTab removed from addons.mozilla.org (who knows why)

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• Patch management on multiple systems

  - by Pierre

  I'm in charge of auditing the security configuration of an important farm of Unix servers. So far, I came up with a way to assess the basic configuration but not the installed updates. The very problem here is that I just can't trust the package management tools on those machine. Indeed some of them did not sync with the repository for a long time (So I can't do a "yum check-updates" on Redhat for example). Some of those servers are not even connected to the internet and use an company repository. Another problem is that I have multiple target systems: AIX, Debian, Centos/Redhat, etc... So the version could be different (AIX) and the tools available will be different. And, last but not least, I can't install anything on the target system. So I need to use a script to retrieve the information and either: process it directly or save the information to be able to process it later on a server (Which may happen to run a different distribution than the one on which the information have been retrieved). The best ideas I could come up with were: either retrieve the list of installed packages on the machine (dpkg -l for example on debian) and process it on a dedicated server (Directly parsing the "Packages" file of debian repositories). Still, the problem remains the same for AIX and Redhat... or use Nessus' scripts to assess vulnerability on the installed packages, but I find this a bit dirty. Does anyone know any better/efficient way of doing this ? P.S: I already took time to review some answers to similar problems. Unfortunately Chef, puppet, ... don't meet the requirements I have to meet. Edit: Long story short. I need to have the list of missing updates on a Unix system just like MBSA on Windows. I'm not authorized to install anything on this system as it's not mine. All I have are scripts languages. Thanks.

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• Windows Server 2008 ignores any change made to firewall

  - by Maurice Courtois

  I have been trying for the last 2 hours to make my Windows Server 2008 answer ping. I have tried almost every single solution I have found on the web, so far nothing work. My current setup: 2 NIC (1x Internet connection, 1x Local network) Server act as VPN server. So I set the corresponding NIC as either Public or Private. I also enable the rule for "File and Printer Sharing (Echo Request...)" for all Nic and from any IPs. I always been able to ping from the local network or the local ip while connected to the VPN. I also tried to create a specific rule for ICMP ping and disabling the firewall for all but the public nic. Regardless of all this, I still can't ping that server from Internet. Any idea suggestion what could cause this? I have the impression that when you set the server as VPN (I switch the box on when setting it up to block everything else than VPN connection) that changing anything to the firewall setting thought mmc is pointless !?!?

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• Outlook signature distribution tools ?

  - by HannesFostie

  Hi We are soon changing our corporate identity, and as such we will need to change our outlook signatures. However, being some 125 people, my colleague sysadmin and I don't want to go around changing these manually, and are thus looking for a good way to do this fully automated. Most of our desktops are XP, with the exceptional few running Win7. Most run Outlook 2007, some run 2003. Our environment is AD-centered, and most of the information will come from AD (telephone number, title, ...). The biggest problem I can see so far is that because we are bilingual (Dutch and French), there will be 2 versions of the signature, depending on what the person has as main language. People currently do not have anything in AD to distinguish this, but we could create a group for it, or perhaps add some sort of attribute. A cheap if not free tool would be great. eMailSignature could probably do most, if not all, of this for us but it's a rather expensive tool costing some 1250 euro. We just want to distribute the signatures, actual "management" is less important as job titles don't change all that much. Any tips are welcome!

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• Using Samba to share a folder from a Linux guest with a Windows host in VirtualBox

  - by AmV

  I would like to share a folder from a Linux Guest with a Windows host (with read and write access if possible) in VirtualBox. I read in these two links: here and here that it's possible to do this using Samba, but I am a little bit lost and I need more information on how to proceed. So far, I managed to set up two network adapters (one NAT and one host-only) and install Samba on the Linux guest, but now I have the following questions: What do I need to type in samba.conf to share a folder from the Linux guest? (the tutorial provided in one of the links above only explains how to share home directories) Are there any Samba commands that need to be executed on the guest to enable sharing? How do I make sure that these folders are only available to the host OS and not on the Internet? Once the Linux guest is setup, how do I access each of the individual shared folders from the Windows host? I read that I need to mount a drive on Windows to do this, but do I use Samba logins, or Linux logins, also do I use localhost? or do I need to set up an IP for this? Thanks!

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• Windows-to-linux: Putty with SSH and private/public key pair

  - by Johnny Kauffman

  I spent about 3 hours trying to figure out how to connect to a linux box from my windows machine using putty without having to send the password. This is connecting to an Ubuntu server that is using OpenSSH. The private key is SSH-2 RSA, 1024 bits. I am connecting using SSH2. I have run into the more common problems already: Putty generated the public key in the "wrong format". I have corrected this (as seen on this blog post). However, since I am not yet connected, I cannot absolutely confirm that this file is in the correct format. The key is all on a single line now, and I have tried adding/removing line breaks at the end of the file. I've also tried the public file doctoring process a few times to ensure that I haven't flubbed up the manual conversion. Even so, I have no way to verify accuracy here. The permissions were at once point wrong as well, specifically meaning that the file had too many permissions. I had to solve this too and I know it got past this because I no longer see a related error in /var/log/auth.log. I've tried both authorized_keys and authorized_keys2 in case the server has an old version of OpenSSH, but this changed nothing. I do have access as a user. After this keyfile stuff fails, I can enter my password instead The only remaining nibble of information I have is that it claims I have the alleged password wrong: sshd[22288]: Failed password for zzzzzzz from zz.zz.zz.zz port 53620 ssh2 Even so, as far as I can tell, this is just a lazy try/catch somewhere, since I don't think there's a password involved at all. I see nothing else in any of the /var/log files of use. What else could be wrong?

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• Ubuntu "No space left on device" for /home, df shows 100% full, ds shows much, much less

  - by Jon Cram

  On an Ubuntu 12.04 server, normal users can no longer create or add to files in /home, encountering a "No space left on device" error. The /home directory has a capacity of 1.7 terabytes and as far as I can tell is nowhere near full in terms of actual data stored or inodes used. df -h shows: Filesystem Size Used Avail Use% Mounted on /dev/md2 1.0T 18G 955G 2% / udev 7.7G 4.0K 7.7G 1% /dev tmpfs 3.1G 320K 3.1G 1% /run none 5.0M 0 5.0M 0% /run/lock none 7.7G 0 7.7G 0% /run/shm cgroup 7.7G 0 7.7G 0% /sys/fs/cgroup /dev/md3 1.7T 1.7T 0 100% /home /dev/md1 496M 45M 426M 10% /boot /home indeed looks rather full. du -hs /home suggests otherwise: 1.4G /home There appears no inode issue - df -i: Filesystem Inodes IUsed IFree IUse% Mounted on /dev/md2 67108864 75334 67033530 1% / udev 2013497 527 2012970 1% /dev tmpfs 2015816 440 2015376 1% /run none 2015816 2 2015814 1% /run/lock none 2015816 1 2015815 1% /run/shm cgroup 2015816 9 2015807 1% /sys/fs/cgroup /dev/md3 113909760 105981 113803779 1% /home /dev/md1 131072 239 130833 1% /boot I recently deleted a many gigabytes of application cache and log data from /home, however this was in the tens of gigabytes at best and nowhere near the capcity of /home. Update 1: du -hs --apparent-size /home 1.2G /home du -hs /home 1.4G /home What might be going on here?

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• How to import a text file into powershell and email it, formatted as HTML

  - by Don

  I'm trying to get a list of all Exchange accounts, format them in descending order from largest mailbox and put that data into an email in HTML format to email to myself. So far I can get the data, push it to a text file as well as create an email and send to myself. I just can't seem to get it all put together. I've been trying to use ConvertTo-Html but it just seems to return data via email like "pageFooterEntry" and "Microsoft.PowerShell.Commands.Internal.Format.AutosizeInfo" versus the actual data. I can get it to send me the right data if i don't tell it to ConvertTo-Html, just have it pipe the data to a text file and pull from it, but it's all ran together with no formatting. I don't need to save the file, i'd just like to run the command, get the data, put it in HTML and mail it to myself. Here's what I have currently: #Connects to Database and returns information on all users, organized by Total Item Size, User $body = Get-MailboxStatistics -database "Mailbox Database 0846468905" | where {$_.ObjectClass -eq “Mailbox”} | Sort-Object TotalItemSize -Descending | ft @{label=”User”;expression={$_.DisplayName}},@{label=”Total Size (MB)”;expression={$_.TotalItemSize.Value.ToMB()}} -auto | ConvertTo-Html #Pause for 5 seconds for Exchange write-host -foregroundcolor Green "Pausing for 5 seconds for Exchange" Start-Sleep -s 5 $toemail = "[email protected]" # Emails report to this address. $fromemail = "[email protected]" #Emails from this address. $server = "Exchange.company.com" #Exchange server - SMTP. #Email the report. $email = New-Object System.Net.Mail.MailMessage $email.IsBodyHtml = $True $email.To.Add($toemail) $email.From = $fromemail $email.Subject = "Exchange Mailbox Sizes" $email.Body = $body $client = New-Object System.Net.Mail.SmtpClient $server $client.UseDefaultCredentials = $true $client.Send($email) Any thoughts would be helpful, thanks!

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• Syncing Google Desktop Scratch Pad

  - by Anders Frey

  I'm a long time user of Google Desktop Scratch Pad and I would like to be able to put the note in the cloud and make it accessible from all my electronic units. I'm working towards changing the filepath Scratch Pad uses to retrieve the .txt to lead to a DropBox folder. As the Desktop Scratch Pad is discontinued I've had no luck in retrieving the API, but what I've got so far is this: The scratch pad data is located at: C:\Users[user]\AppData\Local\Google\Google Desktop\a3d83d5fa2e9\scratchpad.txt The registry keys related to Google Desktop is located at: HKEY_CURRENT_USER\Software\Google\Google Desktop I'm guessing the Scratch Pad app itself is located at: HKEY_CURRENT_USER\Software\Google\Google Desktop\Components I have limited experience with the registry, so I'm not able to translate the binary and hexadecimals, but I'm hoping that the path location is in there somewhere. I've tried using a bunch of other noteapps (including the 'new' scratch pad in chrome) but haven't been able to find one that suits my needs as Desktop Scratch Pad. Hence the effort in this matter. I may be way off and I'm not sure if this is possible to do, but I'm looking forward to hearing your thoughts.

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• Squid reverse proxy array - siblings not communicating with each other

  - by V. Romanov

  I want to set up 2 squid servers to act as reverse proxy and cache for a webserver on our intranet. The load balancing will be done with DNS round robin or just different mappings for different clients. The thing is, I want both servers to try and contact each other to see if they have the object required in cache before contacting the webserver for it (the network that servers the webserver is the bottleneck and I'm trying to eliminate it) Both squids are configured the same, here are the relevant config lines : acl dvr1_cache_it_best_tv_com dstdomain dvr1.cache.it.best-tv.com acl squid1_it_best_tv_com dstdomain squid1.it.best-tv.com acl squid2_it_best_tv_com dstdomain squid2.it.best-tv.com http_access allow dvr1_cache_it_best_tv_com http_access allow squid1_it_best_tv_com http_access allow squid2_it_best_tv_com http_access allow all http_port 8081 accel defaultsite=dvr1.cache.it.best-tv.com cache_peer dvr1.origin.it.best-tv.com parent 80 0 no-query originserver name=Proxy_dvr1_origin_it_best_tv_com cache_peer squid1.it.best-tv.com sibling 8081 3130 weight=10 name=Proxy_Squid1_it_best_tv_com cache_peer squid2.it.best-tv.com sibling 8081 3130 weight=10 name=Proxy_Squid2_it_best_tv_com cache_peer_access Proxy_dvr1_origin_it_best_tv_com allow dvr1_cache_it_best_tv_com cache_peer_access Proxy_squid1_it_best_tv_com allow squid1_it_best_tv_com cache_peer_access Proxy_squid1_it_best_tv_com allow squid2_it_best_tv_com cache_peer_access Proxy_squid1_it_best_tv_com allow dvr1_cache_it_best_tv_com cache_peer_access Proxy_squid2_it_best_tv_com allow squid1_it_best_tv_com cache_peer_access Proxy_squid2_it_best_tv_com allow squid2_it_best_tv_com cache_peer_access Proxy_squid2_it_best_tv_com allow dvr1_cache_it_best_tv_com just to make it clear - dvr1.cache is the alias for the proxy servers. dvr1.origin is the web server. Both servers work, both serve content and cache it and work fine. However, when I clear the cache on one server and then access it, it gets the content from the parent (DVR1_ORIGIN) instead of going to the sibling squid. What did I configure wrong? Or perhaps I don't understand the architecture correctly? I read the squid manuals but as far as I see i did it all by the book and yet it doesn't work right. Any help will be appreciated!

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• How to setup port forwarding from my Webserver (apache) to my Database server (mysql)

  - by karman888

  Hello again guys, and thank you for your help so far. Here is my problem: I have two remote dedicated servers, one webserver that runs apache, and one db server that runs mysql. The apache server is visible on the internet of course, but the second server is only visible to the apache server because they are connected with LAN. I need to connect to the remote mysql server through internet from my home-pc , but only apache server is visible to my home-pc. How can i setup port-forwarding from my apache server to the mysql server so i will be able to "see" the mysql server from my home-pc? This question is a follow-up from my first question Connect to remote mysql server from my application. Problem is that Mysql server is on LAN in which you answered me and helped me a lot by telling me to do "port-forwarding". I looked over the internet, and i cant find a good how-to to do port-forwarding. I'm an experienced programmer, but have little experience on hardware and networks. I can understand though what must be done, so i just need a litle help to sort things out :) I hope you can help me guys, Thank you in advance p.s. machine that Apache is running is on CentOS, mysql server also CentOS. p.s2 webserver runs WebHostManager i dont know if that makes any difference or it can be made easily through this, i just mention it :)

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• LDAP Account Locked Out Sporadically after Password change - Finding the source of invalid attempts

  - by CityView

  On a small network of machines (<1000) we have a user whose account is being locked out after an indeterminate interval following a password change. We are having severe difficulties finding the source of the invalid logon attempts and I would appreciate it greatly if some of you could go through your thought process and the checks you would perform in order to fix the problem. All I know for sure is that the account is locked out several (5+) times a day, I can't even be sure it's due to failed login attempts as there is no record of failure until the account is locked. So far I have tried; Logging the account out of everything we can think of and back in with the new password Scanning the user's box for any non standard software which might perform an LDAP lookup Checking all installed services on our production boxes to check none are attempting to run under the account Changing the user back to their old password (Problem persists so perhaps password change is a red herring) Wireshark on a box where lots of LDAP authentication is performed - Rejects only occur after account is already locked out Clearing the credential cache in - Control Panel - User Accounts - Advanced Looking at the local I'm at a loss for what to try. I am happy to try any suggestions you have in order to diagnose the issue. I think my question boils down to a simple request; I need a technique for deriving the source (Application/Host) of the invalid login attempts which are causing the account to be locked. I'm not sure if that's even possible but I suspect there must be more I can try. Many thanks, CityView

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• Ubuntu 12.10, Unity, AMD 12.11 beta drivers, AMD APP SDK 2.7 and OpenCL detection of multiple gpus

  - by junkie

  I'm using Ubuntu 12.10, AMD 12.11 beta drivers, AMD APP SDK 2.7 and OpenCL. I have three amd radeon 7990s plugged in each of which are a dual 7970 so I have six gpus altogether. I plan to go up to eight in a few days. Windows couldn't use even 4 but linux works fine with 6 so far. The strange thing is that the six gpus are only detected by OpenCL in unity (the ubuntu default window manager). If I switch to e17, blackbox or fluxbox or anything else for that matter OpenCL only detects one. I'm using a simple OpenCL program to list all devices to check. I've also checked the output of aticonfig --list-adapters, fglxinfo and clinfo. The first two always show six in all window managers wheras clinfo shows 6 in unity but 1 gpu in all other WMs. I'm also using an X config generated by aticonfig --initial -f --adapter=all. I'm also only using one monitor. I've also checked using lsmod that the fglrx module is loaded in all WMs. So I have two questions. Why does OpenCL see six gpus only in unity? How can I enable six gpus on other lightweight WMs? Basically I'm getting at what determines how many gpus the OpenCL runtime sees? Thanks.

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• VMWare web UI intermittent access on CentOS

  - by PeteWilliams

  Hiya, I've got a CentOS 5.2 server that I'm trying to get set up as a development environment. As part of this, I planned to install VMWare Server 2 and set up several virtual development servers. I've got as far as installing VMWare Server 2 but access to the remote control panel is only working intermittently. If I access it through Firefox at https://127.0.0.1:8333/ui/# it usually says either: "Connection intterupted: connection was reset before the page loaded" Or "Firefox can't establish a connection to the server at 127.0.0.1" But every now and then it lets me in and I'll manage a few clicks in the web UI before it kicks me out with the following error: "The server could not complete a request (HTTP 0 ). The server encountered an unexpected condition that prevented it from fulfilling the request. If this problem persists, please contact your system administrator." I've done all the updates available in CentOS except one OpenOffice one that is causing a conflict, and I re-ran wmware-config.pl after updating the kernel. Though I went with all the defaults as I don't really know what I'm doing! I've since rebooted and nothing changed. I've also tried accessing the control panel remotely from another machine in the network and the results are the same. Does anyone have any ideas what might be causing this and how I can resolve it? I'm afraid I'm a developer playing at sys-admin, so I may be missing something obvious! Many thanks Pete Update I have now reinstalled both the operating system and VMWare and I'm still getting the same issue. I wonder if it's a result of the settings I'm putting in on the config.pl script..?

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• postfix - connection refused from behind NAT

  - by manchine

  When attempting to telnet postfix from a different host in the same LAN through the FQDN (and thus the LAN's public IP), the following error occurs: root@mailer:/var/log# telnet mail.domain.com 25 Trying 1.2.3.4... telnet: Unable to connect to remote host: Connection refused Other services can be reached from the exact same host, however: root@mailer:/var/log# telnet mail.domain.com 22 Trying 1.2.3.4... Connected to mail.domain.com. Escape character is '^]'. SSH-2.0-OpenSSH_6.0p1 Debian-4+deb7u1 To make matters more intriguing, Postfix can be accessed from outside the LAN: nunos-mbp:mailog nzimas$ telnet mail.domain.com 25 Trying 1.2.3.4... Connected to mail.domain.com. Escape character is '^]'. 220 mail.domain.com ESMTP Postfix (Ubuntu) To sum thing up: a) Postfix (running on 10.10.10.4 / mail.domiain.com) refuses connection from a host in the same LAN (10.10.10.2), but only when queried through the FQDN (mail.domain.com) b) mail.domain.com accepts connections to other services (but Postfix) from 10.10.10.2 c) mail.domain.com accepts connections to all services, including Postfix, from the outside world If it were a firewall issue, then I believe it would not be possible to connect to any service from 10.10.10.2 through the FQSN / public IP. It ought to be some missing parameter in Postfix, although I haven't found any clear pointers so far.

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• Route return traffic to correct gateway depending on service

  - by Marnix van Valen

  On my office network I have two internet connections and one CentOS server running a website (HTTPS on port 443). The website should be publicly accessible through the public IP of the first internet connection (ISP-1). The other internet connection, ISP-2, id the default gateway on the network. Both internet connections have routers (the household-kind) with NAT, SPI firewalls etc. The router on ISP-2 is a Netgear WNDR3700 (aka N600) with original firmware. The problem is that the website is unreachable. Looks like incoming traffic on ISP-1 will reach the server but the returning traffic is routed through ISP-2, effectively making the site unreachable. As far as I can tell I can't do port based routing on the WNDR3700. What are my options to make this work? I've been looking at implementing an iptables / routing based solution on the server itself but haven't been able to make that work. Update: Note that the server has one network interface connecting it to both routers.

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• Photoshop CS5 performance over network drive (cifs)

  - by grub

  Hello Everyone I did install a QNAP NAS TS410 for a customer (professional photographer) with 3 Hitachi Deskstar 7200rpm 2TB disk configured as RAID5. The NAS and the workstations are connected over a Gigabit network. He and his co-worker are accessing the photos (about 1TB of photos) over a mapped network drive from their windows machines (Windows XP - 32bit and Windows 7 Ultimate - 32bit). Both are using Photoshop CS5 to edit the photos. The problem is that to save a edited photo takes a really long time, it takes about 3 times as long to save a photo as to open it. After some tests I can exclude the network, the NAS and the windows machines as source of the issue. I think the problem is the Photoshop software and its handling of the network drives. Officially network drives are not supported by Adobe. I do not have any experience with the Adobe products, especially with Adobe Photoshop CS5. What are your recommendation to solve the performance issue? Should my customer copy the photos to the local drive, edit them and upload them again to the network drive or is Adobe Drive or Adobe Version Cue the answer? One requirement is that the photos need to be accessible / editable from both computers even when one of them is offline. Adobe Version Cue needs a dedicated service running to be usable, so this solution is not possible as far as I understand the Cue software. Thank you for your input to this issue and have a nice day :-) Greetings grub

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• What's the best way to clone multiple PCs from one machine?

  - by Jason T.

  Where I work we have dozens and dozens of old ThinkPad laptops. A lot of these can be reused but not for our needs. They have been long since replaced. The higher-ups have decided to donate them to charity. For better or for worse I have been tasked with reimaging them. I took a laptop and installed the factory copy of Windows, updated it, configured it appropriately. Now I'm trying to reimage it to dozens of other laptops. What's some good software to do this? First I used clonezilla to clone the hdd in the laptop to an internal drive in an external enclosure and it worked. Then I tried taking the base image out and connecting it externally to a laptop that needed to be imaged and I got it to work a few times. So far so good, right? Well once I informed my boss of my findings and what I would want to do then the images started to not work on new laptops. One of three things would happen: The Thinkpads would just blink at me and Windows wouldn't load. Or Windows would load but freeze within two minutes. Last but not least the laptops would BSOD during the Windows XP bootup. These laptops are not going to be used by the company. They're going to charity. So can anyone else recommend a way to reimage multiple laptops?

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• Can I use iptables on my Varnish server to forward HTTPS traffic to a specific server?

  - by Dylan Beattie

  We use Varnish as our front-end web cache and load balancer, so we have a Linux server in our development environment, running Varnish with some basic caching and load-balancing rules across a pair of Windows 2008 IIS web servers. We have a wildcard DNS rule that points *.development at this Varnish box, so we can browse http://www.mysite.com.development, http://www.othersite.com.development, etc. The problem is that since Varnish can't handle HTTPS traffic, we can't access https://www.mysite.com.development/ For dev/testing, we don't need any acceleration or load-balancing - all I need is to tell this box to act as a dumb proxy and forward any incoming requests on port 443 to a specific IIS server. I suspect iptables may offer a solution but it's been a long while since I wrote an iptables rule. Some initial hacking has got me as far as iptables -F iptables -A INPUT -p tcp -m tcp --sport 443 -j ACCEPT iptables -A OUTPUT -p tcp -m tcp --dport 443 -j ACCEPT iptables -t nat -A PREROUTING -p tcp --dport 443 -j DNAT --to 10.0.0.241:443 iptables -t nat -A POSTROUTING -p tcp -d 10.0.0.241 --dport 443 -j MASQUERADE iptables -A INPUT -j LOG --log-level 4 --log-prefix 'PreRouting ' iptables -A OUTPUT -j LOG --log-level 4 --log-prefix 'PostRouting ' iptables-save > /etc/iptables.rules (where 10.0.0.241 is the IIS box hosting the HTTPS website), but this doesn't appear to be working. To clarify - I realize there's security implications about HTTPS proxying/caching - all I'm looking for is completely transparent IP traffic forwarding. I don't need to decrypt, cache or inspect any of the packets; I just want anything on port 443 to flow through the Linux box to the IIS box behind it as though the Linux box wasn't even there. Any help gratefully received... EDIT: Included full iptables config script.

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• Linux arp cache timeout values

  - by Jak

  I'm trying to configure sane values for the Linux kernel arp cache timeout, but I can't find a detailed explanation as to how they work anywhere. Even the kernel.org documentation doesn't give a good explanation, I can only find recommended values to alleviate overflow. Here is an example of the values I have: net.ipv4.neigh.default.gc_thresh1 = 128 net.ipv4.neigh.default.gc_thresh2 = 512 net.ipv4.neigh.default.gc_thresh3 = 1024 Now, from what I've gathered so far: gc_thresh1 is the number of arp entries allowed before the garbage collector starts removing any entries at all. gc_thresh2 is the soft-limit, which is the number of entries allowed before the garbage collector actively removes arp entries. gc_thresh3 is the hard limit, where entries above this number are aggressively removed. Now, if I understand correctly, if the number of arp entries goes beyond gc_thresh1 but remains below gc_thresh2, the excess will be removed periodically with an interval set by gc_interval. My question is, if the number of entries goes beyond gc_thresh2 but below gc_thresh3, or if the number goes beyond gc_thresh3, how are the entries removed? In other words, what does "actively" and "aggressively" removed mean exactly? I assume it means they are removed more frequently than what is defined in gc_interval, but I can't find by how much.

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• Conditionally set an Apache environment variable

  - by Tom McCarthy

  I would like to conditionally set the value of an Apache2 environment variable and assign a default value if one of the conditions is not met. This example if a simplification of what I'm trying to do but, in effect, if the subdomain portion of the host name is hr, finance or marketing I want to set an environment var named REQUEST_TYPE to 2, 3 or 4 respectively. Otherwise it should be 1. I tried the following configuration in httpd.conf: <VirtualHost *:80> ServerName foo.com ServerAlias *.foo.com DocumentRoot /var/www/html SetEnv REQUEST_TYPE 1 SetEnvIfNoCase Host ^hr\. REQUEST_TYPE=2 SetEnvIfNoCase Host ^finance\. REQUEST_TYPE=3 SetEnvIfNoCase Host ^marketing\. REQUEST_TYPE=4 </VirtualHost> However, the variable is always assigned a value of 1. The only way I have so far been able get it to work is to replace: SetEnv REQUEST_TYPE 1 with a regular expression containing a negative lookahead: SetEnvIfNoCase Host ^(?!hr.|finance.|marketing.) REQUEST_TYPE=1 Is there a better way to assign the default value of 1? As I add more subdomain conditions the regular expression could get ugly. Also, if I want to allow another request attribute to affect the REQUEST_TYPE (e.g. if Remote_Addr = 192.168.1.[100-150] then REQUEST_TYPE = 5) then my current method of assigning a default value (i.e. using the regular expression with a negative lookahead) probaby won't work.

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• Disable or remove filter driver for single HID device

  - by snoopen

  Running Windows XP in a corporate setting here. I have an issue where a filter driver is interfering with the functionality of different USB HIDs. For example graphics tablets do not respond while the filter driver is in place. I've also had the issue with foot pedals used with transcription software. My question is really two fold: A) what makes Windows use a filter driver on one HID but not another? B) when a filter driver is causing conflicts how can I disable it on the affected devices? Background I've previously narrowed down the issue to the filter driver by uninstalling the software (Funk Proxy Host) responsible for the filter driver. The software is a type of RDP we use here at work. (I might have even booted into safe mode and renamed the file, I forget). I believe the filter driver is present to disable or modify the use of the local keyboard and mouse while admin staff are assisting users. Either way I don't have the authority to just go uninstalling this software. As far as I can tell the software versions are the same, however I'm not sure if the device driver definitions are all the same as I don't know where these things would be located. To check for the presence of the filter driver I locate the hardware device in Device Manager, click Properties Driver tab Driver Details.... It shows up as ph32ihid.sys. Even though all machines are meant to have the same SOE and do have Funk Proxy Host installed I don't always have issues with the same HIDs. A few machines here the foot pedals without any issues. I've not had any machines work with the graphics tablet without uninstalling Funk software. Driver details I've just read up a bit more about filter drivers and found the drivers description in the registry under "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ProxyHostHIDFilter" There it's called "Kernel-mode HID filter driver for the Proxy Host". Presumably I could also disable it here but that would be system wide which is probably not desirable?

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