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• Forward all traffic from one IP to another Ip on OS X

  - by Josh

  This is related to this question I just asked... I have two IP address on my iMac I want to "bridge". I'm not sure what the proper terminology is... here's the situation. My iMac has a firewire connection to my laptop and an ethernet connection to the rest of my office. My laptop has an ip of 192.168.100.2 (on the firewire interface). My iMac has an IP of 192.168.100.1 on the firewire interface, and two IPs, 10.1.0.6 and 10.1.0.7, on it's ethernet interface. If I wanted to forward all traffic coming in from 192.168.100.2 on my OS X machine to go out on IP 10.1.0.7, and vice-versa, can this be done? I assume I would use the ipfw command. Essentially I want to "bridge" the firewire network to the ethernet network so my laptop can see all the machines on the 10.1 network, and all those machines can see my laptop at 10.1.0.7. Is this possible?

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• How can I use HAproxy with SSL and get X-Forwarded-For headers AND tell PHP that SSL is in use?

  - by Josh

  I have the following setup: (internet) ---> [ pfSense Box ] /-> [ Apache / PHP server ] [running HAproxy] --+--> [ Apache / PHP server ] +--> [ Apache / PHP server ] \-> [ Apache / PHP server ] For HTTP requests this works great, requests are distributed to my Apache servers just fine. For SSL requests, I had HAproxy distributing the requests using TCP load balancing, and it worked however since HAproxy didn't act as a proxy, it didn't add the X-Forwarded-For HTTP header, and the Apache / PHP servers didn't know the client's real IP address. So, I added stunnel in front of HAproxy, reading that stunnel could add the X-Forwarded-For HTTP header. However, the package which I could install into pfSense does not add this header... also, this apparently kills my ability to use KeepAlive requests, which I would really like to keep. But the biggest issue which killed that idea was that stunnel converted the HTTPS requests into plain HTTP requests, so PHP didn't know that SSL was enabled and tried to redirect to the SSL site. How can I use HAproxy to load balance across a number of SSL servers, allowing those servers to both know the client's IP address and know that SSL is in use? And if possible, how can I do it on my pfSense server? Or should I drop all this and just use nginx?

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• High load on a nagios server -- How many service checks for a nagios server is too many?

  - by Josh

  I have a nagios server running Ubuntu with a 2.0 GHz Intel Processor, a RAID10 array, and 400 MB of RAM. It monitors a total of 42 services across 8 hosts, most of which are checked using the check_http plugin even 5 minutes, some every minute. Recently the load on the nagios server has been above 4, often as high as 6. The server also runs cacti, gathering statistics every minute for 6 hosts. I wonder, how many services should hardware like this be able to handle? Is the load so high because I am pushing the limits of the hardware, or should this hardware be able to handle 42 service checks plus cacti? If the hardware is inadequate, should I look to add more RAM, more cores, or faster cores? What hardware / service checks are others running?

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• Primary/secondary ethernet interfaces in Ubuntu 9.10

  - by Josh

  I have an Ubuntu 9.10 machine with three ethernet interfaces, eth0, eth1 and eth2. eth2 is connected to a private network. eth0 and eth2 are connected to two different LANs. Either one will provide access to the internet. All three networks have DHCP servers. Using Ubuntu's the default settings (And Gnome), when I boot up all the interfaces are active and my system gets three IP addresses. However any attempt to access the internet results in connection timeouts and other weirdness. I suspect that traffic is going out on one NIC (like eth0) and coming back in on another (like eth1). I'm not sure what's going on. The only way I can access the internet at the moment is to bring two of the devices down with ifdown. How can I configure eth0 as my primary interface so all trafic goes out by default on that interface, while keeping the other two active? Also, I want to make sure Avahi broadcasts properly on all three IPs so that the computers on the LAN of eth1 can still connect to myHostname.local...

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• Slow connection to Linux MySQL from Windows only (XAMPP)

  - by Josh

  I'm having a problem with a PHP project (using Kohana 3.2 framework) on my Windows 7 64-bit machine connecting to the database. The development database is stored on a Ubuntu Linux server on the local network. Other development machines running OSX and Linux are connecting fine. There are no other Windows development machines to test with. I can access MySQL fine using MySQL Workbench, and other projects (which I believe to be less database heavy) run mostly ok, only occasionally getting timeout messages. I'm constantly getting Maximum execution time of 30 seconds exceeded when functions such as mysql_query() are run in this particular project. Specifically, the Kohana file where the timeout occurs is MODPATH\database\classes\kohana\database\mysql.php [ 186 ]. My local set-up is: Windows 7 Professional 64bit XAMPP 1.7.7 (PHP 5.3.8) The output of uname -a of the Linux server is: Linux peach 2.6.38-11-server #50-Ubuntu SMP Mon Sep 12 21:34:27 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux I've tried the following, with no success: Disabling Windows firewall Switching between using a persistant and normal connection In my.cnf, adding skip-name-resolve Increasing wait_timeout Enabling bind-address I've run out of ideas now, and have no idea how to debug an odd issue like this. Has anyone come across this before, or have any idea how I could find the root of the issue, or what might be the problem?

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• Domain user periodically can't login, but only temporarily?

  - by Josh

  Ok, this is a strange one that I'm having trouble replicating letting alone solving. I have a user who uses two computers (both XP sp3) on the domain with a roaming profile. She has no problems on her personal computer but occasionally needs to use a shared computer. On this shared computer she is sometimes (~once a week) unable to login with the error message "Username or password incorrect. Check username password and domain and try again." I've checked when this happens and her username and password are indeed entered correctly. Now the strange part - if someone else logs in to the computer (which so far always works) and then logs out she is able to log in after that. This problem began after a recent and long overdue password change. I've tried to replicate this problem after a reboot, or after another user logs out to no avail. Any suggestions on troubleshooting or replicating this one? Anyone experienced something similar?

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• Using a nat rule to translate 80/443 traffic to web server, but internal users cannot access it using external ip/domain name

  - by Josh

  I am using Cisco ASDM for ASA I have my internal network called soa. My outside interface is called outside. Let's say my outside IP given to me by my ISP isp is y.y.y.y I have a web server inside my network with a static ip of x.x.x.110. I have configured 2 static nat rules (one for http the other for https). Source is x.x.x.110. Interface is outside, service (http or https). Maybe I am doing this wrong, but when I run the packet tracer, I choose outside interface and for the source IP I used 8.8.8.8 and the destination ip is my outside IP address, y.y.y.y When I run that, it shows the packet traversing successfully, using 9 steps. For my other test, I switch to the soa interface, input an ip on that network, and leave the destination the same. This test comes up with 2 steps and then fails on my access list. When I see the rule that fails, it is my catch all which is source: any desitnation: any, service: ip action: deny. What rule do I need to make to allow my soa network access to go out and come back in by my external IP addess (using a domain name attached to that ip in my dns, of course)?

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• copy email address from group of emails

  - by Josh

  we have a mailing list with bounce backs going into a outlook account. is there an easy way for me to copy all the email addresses out of a group of emails in outlook so i can remove them from my list.

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• Fixing BIND9 rndc error "connection to remote host closed"

  - by Josh

  I just made some changes to a DNS zone in Webmin and clicked the "Apply Changes" button. I received the error message: rndc: connection to remote host closed This may indicate that the remote server is using an older version of the command protocol, this host is not authorized to connect, or the key is invalid How can I troubleshoot / repair this? I copied parts of the BIND config from a failing server, so I suspect that's what causing it...

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• Does NTFS performance degrade significantly in volumes larger than five or six TB?

  - by Josh Yeager

  One of my customers is planning to set up a new document store, which will probably grow by 1-2TB per year. One of my co-workers says that Windows performance is extremely bad if it has a single NTFS volume that is bigger than five or six TB. He thinks that we need to set up their system with multiple volumes so that no single volume will exceed that limit. Is this a real problem? Does Windows or NTFS slow down when the volume size reaches several terabytes? Or is it possible to create a single volume of 10 or more TB?

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• How to host ASP.NET application externally?

  - by Josh

  I have an ASP.NET application that I can get to locally by going to 192.168.1.102:81/TestApp. I would like to host the application externally by going to domain.com:81/TestApp (I already have my domain pointing to my router and this works fine - I have apache running on port 80 on another server). I modified the router settings to point any request coming through port 81 to 192.168.1.102. I am still having trouble accessing the ASP.NET site (I get the error message that "This link appears to be broken"). Am I missing something? How can I redirect domain.com:81/TestApp to my ASP.NET application? Thanks.

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• Samba groups not working

  - by Josh

  I am trying to get samba working with groups. I am using CentOS. #sswords = yes lanman auth = no null passwords = no hosts allow = 129.130.155. netbios name = a server server string = base PHP server [team$] path= /var/www writable = yes valid users = @team force group = @team I have created a few users in linux, and added them to a group called team using groupadd -a -g username. I the attempted to login and got a NT_STATUS_NO_SUCH_GROUP. If I comment out the two last lines in the config it works, but I wish to have group ownership and prefer just to be able to add users to a group in Linux and for it to work with the samba.

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• Windows 2008 - Define IP Order by port or service

  - by Josh

  I have a Windows 2008 server that has three IP bound to the NIC. I can select which IP Windows SMTP listens to, but I want to also set the IP address used when mail is sent. Where would I set which outbound IP to use when sending email? Without using real IPs, here is an example what I have setup. Three IPs associated with the server: 10.0.0.1 10.0.0.2 10.0.0.3 I setup the binding on 10.0.0.2 for port 25 in the SMTP server settings, so that it is the only IP that will respond for inbound. When I look at the email header from an email sent from that server, it lists the server with an address of 10.0.0.3. I would like it to use 10.0.0.2 so that when reverse DNS is performed, it maps back correctly.

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• Apache configuration FollowSymlinks- Apply to php scripts?

  - by Josh

  I have Options set to none for my webroot directory. I also have a symmlink /var/coderoot - /var/webroot/coderoot In the php script I can do include("/var/coderoot/file"); and it works fine. Regardless of the option (yes I save and restart apache.) Does follow symlinks only apply to symlinks used in a certain way? Is there a performance loss using the include with a symmlink?

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• Unattended Install of Zend Server license

  - by Zoop - Josh

  I have a Zend Server 5.6 development license and I wanted to know if there is a way to apply the license during install, rather than via the web interface after it has installed. I ask because I administer our server environment via Rightscale and have automated the creation of the server, however it still requires manual input for the license details. We regularly fire up a staging server to do final tests before pushing to production and it would be great if it were completely hands off.

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• Can't open Control Panel or IE

  - by Josh

  I have a XP computer where when ever I try to open Control Panel nothing happens, nothing flashes on the screen. Same thing with Internet Explorer. I've scanned the computer with Malwarebytes and Avast, Malwaresbytes found some Adware which it removed without problems. Avast found nothing. I looked at the running processes with Process Explorer, nothing malicious running. And looked at a Process Monitor output when I tried to run IE, nothing obviously wrong. The process just decides to exit. What can I try next? I would suspect corrupt IE install but Control Panel doesn't work either. UPDATE: Nether work in Safe Mode under the user account. (only 1 user on the computer) But in Safe Mode, under the built in Administrator account, they work. So what ever is broken, is only broken in the one account. Anything under the HKCU registry key that could break this?

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• How can I prevent Virtualmin from storing passwords in cleartext?

  - by Josh

  I am really surprised at this behavior. In Virtualmin, I can see the password for any SSH user by clicking the "(Show..)" link next to the "Password ( ) Leave unchanged" option in a variety of locations. I have found that the passwords for all users including users with SSH access are stored in cleartext files in /etc/webmin/... This seems like an unnecessary risk! How can I prevent Virtualmin from storing passwords in this manner?

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• Good free guide for mod_security?

  - by Josh

  I have looked at the official sites documentation, and it is a little tough to find starting points. Is there a free comprehensive guide that is easy to understand for someone that has never dealt with mod_security?

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• What should a hosting company do to prepare for IPv6?

  - by Josh

  At the time of writing The IPv4 Depletion Site estimates there are 300 days remaining before all IPv4 addresses have been allocated. I've been following the depletion of IPv4 addresses for some time and realize the "crisis" has been going on for many years and IPv4 addresses have lasted longer than expected, however... As the systems administrator for a small SaaS / website hosting company, what steps should I be taking to prepare for IPv6? We run a handful of CentOS and Ubuntu Linux systems on managed hardware in a remote datacenter. All our servers have IPv6 addresses but they appear to be link local addresses. Our primary business function is website hosting on a proprietary website CMS system. One of my concerns is SSL certificates; at the moment every customer with an SSL certificate gets a dedicated IPv4 IP address. What else should I be concerned about / what action should I take to be prepared for IPv4 depletion?

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• Linux noob question - How do I update a program built from source?

  - by Josh

  When I build a program from source (CentOS), How do I go about updating it to a new version? Can I just run the make && make install again with the same configure options?

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• How do you create an ssh key for the apache user on Redhat?

  - by Josh Smeaton

  As the question asks, how do I generate an ssh key for the user apache on Redhat? My use case, is that we have a mercurial server running under the apache user. We also have several web servers clustered that we need to log on to manually and do pulls from. Ideally, what we'd like to do is have the mercurial server push all changes to all the webservers in the cluster. To do this, we want to use ssh, as setting up http mercurial servers on each of the web servers seems like too much work, and far too heavy. What I've tried to do is the following: > sudo mkdir /var/www/.ssh > sudo chown -R apache:nobody /var/www/.ssh > su - apache -c "ssh-keygen -t rsa" This account is currently not available. I found the above commands elsewhere, but I can only assume that Redhat has differences to whatever distro was used for the above. Is there a way I can generate an ssh-key for the apache user?

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• remote desktop computer viewer?

  - by Josh

  I would like to install a quad core computer in my dorm at college and use my much slower laptop to be able to control the quad core just as if I had a quad core laptop (control as in i see the gui, not command line control)! Both are on the same college network, though Im also interested in what would be necessary if the computers were on different networks. What would be the best method fot this? Im looking for non-lag communication.

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• What does it mean to install two OS's alongside each other?

  - by Josh

  I currently have Windows 7 installed on my PC. However, I just tried out Ubuntu via booting from a disc and I love it. I want to install it onto my HDD, but I don't want to get rid of Windows 7. I know HOW to do this, but I am a little unsure what the consequences might be. What does it mean to install Ubuntu alongside Windows? Do they share the same resources? Also, I have my HDD already partitioned into two sections, a 70 GB section where Windows is installed and then another 400 GB section where all my data is stored. There is currently 26 GB free on the 70GB partition. I know Ubuntu doesn't take up much space. However, if I install Ubuntu in that space, will I still be able to install programs on Windows in the future? My main concern is that I am going to short-change my hard drive space for future installations. EDIT: I guess another big question I have is if I install a program on one OS, will the other be able to use it?

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• Force Windows to cache executables without running them?

  - by Josh Einstein

  Is there a way to force Windows to pre-load certain EXE/DLL binaries into its prefetch/superfetch cache as if they had been executed? I have a particular application that loads pretty slowly on first run but if it's "warm" (recently executed) it starts pretty quickly. I'd like to prime the cache early in the background before the application is needed. But since it shows a UI, I'm looking for a way to do this silently. So simply launching the application it isn't ideal. Thanks you in advance. Prompted by David's suggestion in the comments, I wrote a PowerShell script to memory map the files, seek to the end, and close them. I haven't done any controlled tests yet and it could just be my imagination, but Sublime Text (the application in question) appeared to load much more quickly this time around and I haven't used it for several hours.

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• In a php script making /coderoot refer to /var/webroot/coderoot?

  - by Josh

  We are migrating a server and have modified the architecture slightly so that instead of /var/coderoot we now have /var/webroot/coderoot - I realize I could do a scripted find and replace, but I would rather have full unmodified reverse compatibility, or if that's unreasonable lets just say for theories sake. I tried using a symmlink ln -s /var/coderoot /var/webroot/coderoot but attempting to include a file in the code root using /var/coderoot/file does not work. I also tried using mod_alias with ScriptAlias and Alias. Neither worked. Is there anyway to do this?

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