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• How do i Setup a Mac OS X Server - NameServer behind an Airport Extreme?

  - by basilmir

  I have a Mac mini server i want to setup to host a couple of things. My setup is as follows: The WAN connection (static IP and ISP nameservers) goes into the wan port of the Airport Extreme. The Mac mini server is connected to one of the ethernet ports. The mac mini will host my domain something.com. My settings so far: Airport Express gets: 96.x.x.x as the external static IP from the ISP 174.y.y.y as the nameserver Mac mini server always gets a reserved DHCP IP from the Airport Express: 10.0.1.3 is the server's ip 10.0.1.1 as the dns (this ip is the airport express itself) My dns server has an A record pointing to ns.something.com and a PTR doing the reverse. I've already added my 96.x.x.x to point ns.something.com with my registrar as attached. NOW: Nobody seems to be able to access my ns.something.com to resolve any of my records. From a any computer in my network I CAN see my ns and everything works. The outside on the other hand does not... it's as if the airport extreme which "holds" the exterior 94.x.x.x address doesn't pass DNS along to my 10.0.1.3 ns server. I have the server managing the airport. Isn't this supposed to work?

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• Portforwarding Combine Several Ports

  - by kiraitachi

  Hi I got a Raspberry Pi at A.A.A.B in my local network and I have set up a DMZ on my router so that any incoming traffic that comes to my router gets redirected to my raspberry pi wich I can connect via NO-IP adress. The problem is that I want to set up portforwarding since i got several services running on my Pi like SSH, torrent webgui, webalbum, etc. I had this already done before long time ago, but I forgot a bit the syntax and cant get to set it up. Router Help says: The Application allows you to do port forwarding, but only have the ports open when data flowing out of the trigger ports. When a program sends data out on outgoing ports called trigger ports, the device then allows incoming data on the open ports specified in your port triggering configuration. 1.Trigger Port Start Trigger Port Start Specify the start port on the device that would trigger the device to open ports for incoming data. 2.Trigger Port End Specify the end port on the device that would trigger the device to open ports for incoming data. You can enter a port number the same as the trigger port start or enter a larger port number to specify a port range. 3.Trigger Traffic Protocol Type Select the trigger traffic type. Open Port Specify all the ports to be opened. It's content could be: A single port only. A port range only. Start open port number and end port number should be separated by "-" . Combined several single port and several port ranges. Each single port or port range should be separated by "," . Open Traffic Protocol Type Select the open traffic type. This are the fields: http://es.tinypic.com/view.php?pic=n5lv1k&s=8 I think this is the syntax 1-7999,8001-9090,9092-65535. But each time I want to add it gives me an error. Any ideas?

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• Make a drive from one machine appear as a physical disk in another machine.

  - by Roberto Sebestyen

  I want to take a physical disk (or part of a disk) in one machine (call it machine-A) and I want to make it available in another machine (machine-B). But I don't want to map a network drive. I want it to appear in machine-B as a physical drive. Even though it is not a physical drive. The reason I want to do this is i want the ability to create shares in machine-B on that drive. Since I cannot do that on mapped drives, I need to use some utility that fools machine-B to think that it is a physical drive, and treat it as such. Both of these machines are windows server 2003. I heard about NFS, It sounds like what could be the solution to my problem. But isn't that a Linux/Unix protocol? What tools can I use to make this happen? Are there any open source solutions? I don't care what the solution is, as long as it achieves the end result, preferably open source solution though. Thanks for reading guys and gals!

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• Proper approach to debug PC startup problems (POST)

  - by saurabhj

  My CPU was heating up to around 65 deg C and last time this had happened (about a year ago), I got thermal paste put between the CPU and heat sink and this managed to get it down to about 45 - 50 degrees. This time, I got some thermal paste and put it myself. However, my PC is not showing the POST display and not starting up. This is what happens LEDs light up HDDs spin Mouse is getting power All fans including the processor fan starts No display on monitor No diagnostic beep sounds (no sounds at all) What I have tried Removing everything including RAM, HDD, PCI cards, AGP card Boot up machine No changes from first state. What steps can I take to figure out where the problem lies? Note (might be important) When I removed the heat sink, the processor came out with it (it was stuck to it inspite of the processor latch on) Had to pry it separate with a screw-driver. Configuration Pentium 4, 2.8 Ghz with HT (very old, I know) Original Intel Mobo with onboard sound and graphics (GB series) 2x512 Mb DDR-RAM 2 SATA disks (320 Gigs / 250 gigs) DVD Writer Creative Sound Card Network card Any help would be appreciated. Thanks!

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• Does image block (firefox addon) save internet bandwidth usage?

  - by dkjain

  Does image block save internet bandwidth usage. I have a data capped plan from my ISP ( 5GB at 2mbps and thereafter 256 kpbs / pm). I doubt if the addon or other similar addon actually saves bandwidht. Here is my point of view, pls correct if that is wrong. When a request is sent to the server, the server sends out whatever page it's requested to serve with all its text and images etc. So essentially my ISP has made his pipe available for the data to reach me thus he would count those bytes under my data plan. When the data arrives it's all first stored to my browser cache (folder) area which means all the data has actually been received by me/computer using my ISP's pipe. The browser then fetches those data from the cache and displays it. By hitting the stop button or blocking images via ur addon I am just choosing not to display the data which would remain in the cache or eventually be discarded if still on the network pipe after a timeout limit. The point is the data request have been completed by the ISP and so the data would be metered and thus using addon such as image block or hitting stop button while page is loading does not in any way save internet bandwidth. Your comments plz....... Regards dk.

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• Apache on CentOS 5.9 VM serves my optimized images corrupted (but my Mac doesn't)

  - by Robert K

  I'm using a Vagrant VM to mirror the client's environment as closely as I can. As part of our build process we do no optimization of assets early on; that comes as we're ready to take a site live. Needless to say, this issue is beginning to worry me as we need to take the site live very soon. I use ImageOptim to automate optimization of image assets, which runs a whole series of tools (Zopfli, PNGOUT, OptiPNG, AdvPNG, PNGCrush). I always set the optimizations to their maximum setting. After optimization, my PNGs start looking like this: What's weird is, if I serve the same file through my Mac's copy of Apache, not through Vagrant, the image loads fine. In fact, the only time it's ever corrupt like this is when the image is served from the Vagrant VM and its install of Drupal. All optimized JPEGs display only the first ~20% of the image. And PNGs, depending on the image, may show either a portion or the "progressive"-style corruption below. The browser itself makes no difference, the same browser will serve an uncorrupted image from my Mac's Apache instance and a corrupt image from the VM. When I disable all PNG optimizations except PNGCrush, and the removal of the PNG metadata, the image is served corrupted. I'm optimizing JPEG images with JPEGmini. The server is running CentOS 5.9, Apache 2.2.3-85, PHP 5.3.3, and Drupal 7. As best as I can tell the error lies somewhere within the VM, either with Apache or with (perhaps) the network stack. Seems like the tools that optimize the compression of the PNGs and JPEGs are what trigger this error. I've already determined that the .htaccess file isn't interfering with how the images load. What should I try to troubleshoot this?

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• Unwanted forced authentication after server restart (Win 2k3)

  - by Felthragar

  We're running a Win 2k3 R2 Standard 64-bit edition server. On this server we're running a fileserver and the ability to allow remote login to our network through vpn. We do not currently utilize a domain setup, all user accounts are local accounts on the server. Each employee is given a unique account to login to the server. The password is a randomly generated 16 character long string, which makes it hard to remember. What we've done is basicly had the password stored on the client machine (standard "Remember Me" functionality). This has worked well. However, last night our server automatically restarted after an automatic update. After that, some of our employees, myself included, had to re-authenticate with the server, submitting our credentials again. Then again, some others did not have to re-authenticate. Do you guys have any idea why this is? Is there a setting to prevent this? I've checked the logs but I couldn't find anything of interest. Then again I'm not really sure what I'm looking for. Thanks in advance, I'll try to answer any additional questions you may have. Edit: When I say "login" or "authenticate" I mean through the standard windows samba protocol. Edit 2: Ok, new day. Tonight the server restarted again, and the same two clients that had to re-authenticate yesterday had to re-authenticate today as well. The rest did not.

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• How to connect android client to the localhost of Apache server (php) inside my laptop?

  - by user1796310

  I'm trying to create android apps which able sending data through wifi connection to my laptop Apache Server and MySQL database. I use the samsung galaxy tab 10.1 as my mobile device. and the protocol i used is HttpGet or HttpPost. And i use XAMPP( with Apache& SQL) to do the server and process the php. But, due to android cannot detect adhoc network from laptop, i use Virtual Router ( for window 7) to create virtual access point and make the tablet able connect to my laptop. But the problem is: [1] in my apps (client-android), where the httpget or httppost to which url? localhost in my laptop- 127.0.0.1 or localhost in android 10.0.0.1? or the ip address of the virtual router? [2]so, if i want access from android to the localhost(laptop-Apache) to call the php to run? which port? which ip address /url that i need to put in android apps(httpget)? and do i need to modify anything in httpconfig for XAMPP? thanks alot.

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• Losing SQL connections

  - by john pavelka

  sql servr 2005 - Standard; one dedicated sql server (VM); windows server 2003; Small databases; About once a week we lose all sql connections. It seems to fix itself after about 5-10 minutes. System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. --- System.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. We don't have a fully qualified DBA; it's kind of a joint effort here. Can somebody give me some general ideas for troubleshooting the network side and the application side? We already ran a few tuning profiles and ran through Database Tuning Advisor to apply indexing recommendations. It would sure be nice if there was a way to take a snapshot of what was running on sql server when these 100% cpu spikes occured, but sometimes we're not around. Is it common to throttle CPU for certain processes? Can this be done with Windows server 2003? For example, if security apps were making cpu spike to 100%, is there a way to limit their cpu usage? Any advice is appreciated. thanks,

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• /etc/hosts: What is loghost? (fresh install of Solaris 10 update 9)

  - by cjavapro

  # # Internet host table # ::1 localhost 127.0.0.1 localhost XX.XX.XX.XX myserver loghost What is the purpose of loghost? If it was not for having loghost in there, all the /etc/hosts files on all the servers in this particular network could be identical. Edit: I looked at /etc/syslog.conf #ident "@(#)syslog.conf 1.5 98/12/14 SMI" /* SunOS 5.0 */ # # Copyright (c) 1991-1998 by Sun Microsystems, Inc. # All rights reserved. # # syslog configuration file. # # This file is processed by m4 so be careful to quote (`') names # that match m4 reserved words. Also, within ifdef's, arguments # containing commas must be quoted. # *.err;kern.notice;auth.notice /dev/sysmsg *.err;kern.debug;daemon.notice;mail.crit /var/adm/messages *.alert;kern.err;daemon.err operator *.alert root *.emerg * # if a non-loghost machine chooses to have authentication messages # sent to the loghost machine, un-comment out the following line: #auth.notice ifdef(`LOGHOST', /var/log/authlog, @loghost) mail.debug ifdef(`LOGHOST', /var/log/syslog, @loghost) # # non-loghost machines will use the following lines to cause "user" # log messages to be logged locally. # ifdef(`LOGHOST', , user.err /dev/sysmsg user.err /var/adm/messages user.alert `root, operator' user.emerg * ) Very interesting. when shutting down,, alerts go to all users probably through *.emerg * Looking at ifdef, it seems that the first parameter checks to see if current machine is a loghost, second parameter is what to do if it is and third parameter is what to do if it is not. Edit: If you want to test a logging rule you can use svcadm restart system-log to restart the logging service and then logger -p notice "test" to send a test log message where notice can be replaced with any type such as user.err, auth.notice, etc.

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• php extensions & apache mods gone/not working after server restart?

  - by user1782359

  I was wondering if anyone has ever come across this before, as I'm pretty stumped to be honest, and my server admin knowledge isn't particular good so I'm not sure what could even be wrong, let alone how to fix it. Basically, Thursday last week everything was fine on our server. I come in on Friday and it's a mess: php extensions are missing/not working, apache modules are gone. (e.g. oci_* was gone completely, odbc_ not working but still there, the apache ntlm_auth for single sign on was gone and so the website wasn't even loading in IE). I'm ruling out anything deliberate because it's just incredibly unlikely. The only thing that really happened between thursday & friday is that on thursday evening one of the network guys did a RAM upgrade on the server and restarted it. That's it, nothing else. Now I'm wondering if somehow those extensions and such which we installed months ago were somehow only saved in a local memory of sorts, and a restart has wiped them? But we installed them all as root, so I don't see why it should be any different from installing anything else. It makes little/no sense to me. To expand on an example of something that's gone very wrong, the php odbc_ extension: It's still on the server, it doesn't return undefined function or anything. But it just cannot connect to the datasource any more. I've tested it through the command line and it's working perfectly fine with that datasource and login details, but all of a sudden having it in the php odbc_connect() function and it just can't connect. ( [S1000][unixODBC][FreeTDS][SQL Server]Unable to connect to data source. ) But unixODBC is set up fine. Like I say i've tested it all through the terminal and it can connect, and we've not changed anything, it's just now all of a sudden not working through the PHP function. Anyone have any ideas whatsoever as to what could be going on? This is on CentOS 5.x by the way.

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• Managed LAMP platform for maximizing availability and global reach, not scalability

  - by user66819

  Assume a Linux/Apache/MySQL/PHP application for a small base of registered users. With small userbase, there are no traffic peaks so the scalability that cloud platforms offer is not imperative. But the system is mission-critical, so availability is the primary goal. Users are also distributed across Asia, Europe, and US, so multiple server locations that minimize users' network hops would be highly desirable. The dream: a managed VPS platform where we would configure a single server (uploading PHP and other files, manipulating database, etc.), and the platform would automatically mirror the server in a handful of key places around the world (say one on each US coast, one in Europe, one in east Asia). File system synchronization and MySQL replication would happen automatically. Core operating system is managed, so we don't need to do full system administration and security, and low-level backups are also done by service provider, though we also do our own backups as well. Couple this with some sort of DNS geo-detection, so users are routed to the nearest operational server... with support for https, of course. Does such a dream exist? If not, what are some approaches to accomplish the same end with minimal time investment and minimal monthly hosting costs?

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• File descriptor linked to socket or pipe in proc

  - by primero

  i have a question regarding the file descriptors and their linkage in the proc file system. I've observed that if i list the file descriptors of a certain process from proc ls -la /proc/1234/fd i get the following output: lr-x------ 1 root root 64 Sep 13 07:12 0 -> /dev/null l-wx------ 1 root root 64 Sep 13 07:12 1 -> /dev/null l-wx------ 1 root root 64 Sep 13 07:12 2 -> /dev/null lr-x------ 1 root root 64 Sep 13 07:12 3 -> pipe:[2744159739] l-wx------ 1 root root 64 Sep 13 07:12 4 -> pipe:[2744159739] lrwx------ 1 root root 64 Sep 13 07:12 5 -> socket:[2744160313] lrwx------ 1 root root 64 Sep 13 07:12 6 -> /var/lib/log/some.log I get the meaning of a file descriptor and i understand from my example the file descriptors 0 1 2 and 6, they are tied to physical resources on my computer, and also i guess 5 is connected to some resource on the network(because of the socket), but what i don't understand is the meaning of the numbers in the brackets. Do the point to some property of the resource? Also why are some of the links broken? And lastly as long as I asked a question already :) what is pipe?

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• PFSence VPN Routing

  - by SvrGuy

  We use PFSense firewalls at three installations with the following LAN networks: 1.) Datacenter #1: 10.0.0.0/16 2.) Datacenter #2: 10.1.0.0/16 3.) HQ: 10.2.0.0/16 All of these locations are linked via an IPSEC tunnel that works properly. Hosts in any of the above networks can communicate with hosts in any other of the above networks. Now, for our laptops etc. we established a road warrior network 10.3.0.0/16 and have implemented OpenVPN to link the laptops etc. to Datacenter #1. This works great too, so our laptops can connect and communicate with any host in Datacenter #1 (anything on 10.0.0.0/16) The problem is the laptops can't communicate with any hosts that Datacenter #1 can reach by its IPSEC tunnel to Datacenter #2 (and/or the HQ for that matter). Does anyone know what to do configuration wise on the PFSense box in Datacenter #1 to configure to route packets received on the OpenVPN tunnel to Datacenter #2 over the IPSEC tunnel? It could be a setting on the OpenVPN or some sort of static route or some such. Any ideas?

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• Setting up test an dlive enviornment - how?

  - by Sean

  I am a bit new to servers and stuff so had a question. I have my development team working on my website. They are in different countries and currently they put all the work live on the test site. But the test site is open to anyone who knows the URL. It is behind a directory but this effects my QA process because i cannot use the accurate URL structures to prevent the general public from seeing it. So what I want to do it: Have my site live on the net but only for me and my team, so like an internal network. Also I will need to mirror this to my live site when i put it live. So i guess this is something like setting up a staging and live environment. So how to do it and are both environments on the same physical server or do i need to buy two servers? And if i setup a staging environment how will i access it and my team since we are all spread out so i assume we need to log into something to access it? What about the URL - do i need a different URL for the test site or can i use the same live url for the test site? I plan to get a dedicated server + CDN for my site.

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• Power surge PC damage: How can I test all components of my PC without access to a second computer?

  - by Doug T.

  Ever since we had some crazy power surges last week my 64 bit Windows 7 PC has been acting strange. My USB network adapter disconnects from the wireless and can't detect the signal. I have to disable/reenable the adapter to detect it again. Also my wife has reported that the PC has rebooted a few times while I'm not sitting at it. Today I finally caught the reboot while I was using the PC. I got this blue screen of death. Stop Code 0x00000109: "Modification of system code or a critical data structure was detected." I followed the advice at the linked article and ran a memory test. I used memtest86 and its already found around 300,000 errors out of 8 gigs of ram. Now I'm worried -- what are the odds this is isolated to just my memory and not just a system wide problem? Isn't there a good chance that many other components are fried? More importantly, how can I test those other components? Are there tools similar to memtest I can use to test my motherboard/video card/power supply? If these are vender specific, is it typical for vendors to provide testing tools?

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• Transfer iptables rules to another server (almost) real time

  - by MrShunz

  I'm running 2 cPanel servers with ConfigServer Security & Firewall plugin. One of the functions of the plugin is to block via iptables (temporarily and/or permanently) IPs which fail various authentications (POP3/IMAP, SMTP, FTP, webmail, mod_security and such). Now, i'd like to push those IP blocks to the border router to drop packets as soon as possible (and doing so protecting the other machines on the network). Keep in mind that after N failed logins IP is blocked for 5 minutes, then re-allowed. If multiple bans occours in an hour IP is blocked permanently and should be unlocked "by hand". So I need a near realtime solution. What I'm looking for is a better way than firing some cronjobs both on cPanels and border router to: dump the rules to file transfer the file to border router (via scp/sftp) load the rules from the file in the border router I'm aware that I will need some scripts to parse and modify the rules as cPanels have one ethernet interface and some aliases while border router has two ehternet interfaces and some loopbacks. All machines involved use Linux. EDIT as per @pjmorse comment. The plugin consists of a bunch of perl and config files. The part I'm intrested in is a process which scans logfiles (lfd) and installs iptables rules (and sends an alert email). Fact is, it upgrades quite often (one or two times a week) and itself is 7000 lines of perl so I'm not comfortable on tampering with it.

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• Bridging networks problems

  - by Eric

  In my setup I have 3 computers and 2 (wireless d-link) routers. Computer1 has ethernet and wireless interfaces ethernet : 192.168.0.x (DHCP) wireless : 192.168.10.254 (static) Computer 2 has ethernet with two ips ethernet1 : 192.168.0.90 (static) ethernet2 : 192.168.10.110 (static) Computer 3 is a particular device with a hardcoded ip that I can't change wireless : 192.168.10.41 (static) Router1 manages internet and DHCP for network 192.168.0.0/24 Router2 is more complicated. I don't use DHCP. I use it to bridge between both networks. Its static ip is 192.168.10.1 Computer1 can ping Computer2. Computer1 can ping Computer3. Computer1 can ping Router1. Computer1 cannot ping Router2. Computer2 cannot ping Computer3. Computer2 can ping Router2. Router1 can ping Router1 Router2 can ping Computer2 Router2 cannot ping Computer1 Router2 cannot ping Computer3 This is very weird. Router2 manages the wireless connection, it should be able to ping its own computers right? My question is obviously : How can I make it so Computer2 can access everything else. This is a traditional case of "it was working before christmas and now it doesn't". The ethernet wiring is as follow : [ Computer1 ]----[ Router1 ]---[ Router2 ]---[ Computer3 ] I am using switch (lan) ports on Router1/2.

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• New AD user request form and workflow

  - by user66390

  I'm wondering if anyone is providing a solid solution for creating New Network User Account Request forms, and attaching workflows to them to automate account creation? I'm currently investigating a number of options, but am surprised that such a ubiquitous task hasn't been solved a dozen times over and thoroughly documented. Or at least isn't integrated into current off-the-shelf change management and ticketing systems. Ideally, I'd like for our current ticketing system, ServiceDesk+ to present a standard 'New User' form to department heads, which they can fill in with the required new user details. This triggers a workflow that submits the request as a ticket that can be reviewed and actioned. Actioning the ticket triggers a workflow that creates a user in AD with the details provided, and notifies the department head upon completion. All told, a pretty standard requirement that I'm sure most organizations have. What are other people doing to accomplish this? Edit: I should add, I'm more looking for "supported" methods. As is, I've submitted a number of scripted solutions, none of which have met with manager approval.

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• How can I generate filesystem images that are usable on many different virtualization systems?

  - by Mark Longair

  I have written a script that generates a root filesystem image (based on Debian lenny) suitable for User-Mode Linux. (Essentially this script creates a filesystem image, mounts it with a loop device, uses debootstrap to create a lenny install, sets up a static IP for TUN/TAP networking, adds public keys for login by SSH and installs a web application.) These filesystem images work pretty well with UML, but it would be nice to be able to generate similar images that people can use on alternative virtualization software, and I'm not familiar with these options at all. In particular, since the idea is to use this image as a standalone server for testing the web application, it's important that the networking works. I wonder if anyone can suggest what would be involved in customizing such root filesystem images such that they could be used with other virtualization software, such as VMware, Xen or as an Amazon EC2 instance? Two particular concerns are: If such systems don't use a raw filesystem image (e.g. they need headers with metadata or are compressed in some particular way) do there exist tools to convert between the different formats? I assume that in the filesystem, at least /etc/network/interfaces will have to be customized, but are more involved changes likely to be necessary? Many thanks for any suggestions...

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• Iptables - forward email ports?

  - by Emmet Brown

  im trying to open some local ports (LAN) and then re-direct them to another server (WAN) using iptables. Here is my config: #WAN allow-hotplug eth1 auto eth1 iface eth1 inet static #Tarjeta red WAN address 192.168.2.2 gateway 192.168.2.1 netmask 255.255.255.0 #LAN allow-hotplug eth0 auto eth0 iface eth0 inet static address 192.168.16.6 netmask 255.255.255.0 network 192.168.16.0 broadcast 192.168.16.255 I try this: iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 110 -j DNAT --to 200.40.30.218:110 iptables -A FORWARD -p tcp -i eth0 -o eth1 -d 200.40.30.218 --dport 110 -j ACCEPT iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 25 -j DNAT --to 200.40.30.218:25 iptables -A FORWARD -p tcp -i eth0 -o ethq -d 200.40.30.218 --dport 25 -j ACCEPT but, it did not work. i also try changeing eth0 to eth1 (and eth1 to eth0) but nothing happened. Starting Nmap 5.00 ( http://nmap.org ) at 2011-10-03 14:44 UYST Interesting ports on 192.168.16.6: Not shown: 997 closed ports PORT STATE SERVICE 22/tcp open ssh 111/tcp open rpcbind 8080/tcp open http-proxy Im running debian. Can u guys help me to check what is happening? edit: IPTABLES-SAVE # Generated by iptables-save v1.4.8 on Mon Oct 3 15:43:14 2011 *mangle :PREROUTING ACCEPT [139993:77867651] :INPUT ACCEPT [139385:77761761] :FORWARD ACCEPT [186:12071] :OUTPUT ACCEPT [173556:74341650] :POSTROUTING ACCEPT [173734:74352988] COMMIT # Completed on Mon Oct 3 15:43:14 2011 # Generated by iptables-save v1.4.8 on Mon Oct 3 15:43:14 2011 *nat :PREROUTING ACCEPT [1649:190626] :POSTROUTING ACCEPT [6729:339646] :OUTPUT ACCEPT [6697:337660] -A PREROUTING -i eth0 -p tcp -m tcp --dport 110 -j DNAT --to-destination 200.40.30.218:110 -A PREROUTING -i eth0 -p tcp -m tcp --dport 25 -j DNAT --to-destination 200.40.30.218:25 COMMIT # Completed on Mon Oct 3 15:43:14 2011 # Generated by iptables-save v1.4.8 on Mon Oct 3 15:43:14 2011 *filter :INPUT ACCEPT [138307:77066136] :FORWARD ACCEPT [168:11207] :OUTPUT ACCEPT [172288:73655708] -A FORWARD -d 200.40.30.218/32 -i eth0 -o eth1 -p tcp -m tcp --dport 110 -j ACCEPT -A FORWARD -d 200.40.30.218/32 -i eth0 -o ethq -p tcp -m tcp --dport 25 -j ACCEPT COMMIT # Completed on Mon Oct 3 15:43:14 2011 Regards

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• Limited bandwidth and transfer rates per user.

  - by Cx03

  I searched for a while but couldn't find anything concrete, hopefully someone can help me. I'm going to be running a Debian server on a gigabit port, and want to give each user his/her fair share of internet access. The first objective is easy - transfer rates (speed) per user. From what I've looked at, IPTables/Shorewall could do the job easy. Is this easy to setup, or could one of you point me at a config? I was hoping to limit users at 300mbit or 650mbit each. The second objective gets complicated. Due to the usage of the boxes, most of the traffic will be internal network traffic that does NOT get counted to the quota. However, I still need to limit the external traffic, and if they go over, cut off access (or throttle traffic to a very low speed (10mbit?)). Let's say the user has a 3TB external traffic limit. The IF part is: If the hostname they are exchanging the traffic with DOES NOT MATCH .ovh. or .kimsufi. (company owns multiple TLDs), count to the quota. Once said quota exceeds 3TB, choke them. Where could I find a system to count that for me? It would also need to reset or be able to be manually reset on a monthly basis. Thanks ahead of time!

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• (Windows 7) Shared External Drive Permission Issues

  - by connec

  So, say I share my system (C) drive through windows (E.g. properties -> Sharing -> Advanced Sharing -> Share this Folder). I can then access this drive at \\Comp\C on another networked computer - all is well. However, if I insert a removable (USB) disk, say "E", and proceed to share it the same way, when I attempt to access \\Comp\E (either directly or through browsing) I get an error: Windows cannot access \\Comp\E You do not have permission to access \\Comp\E. Contact your network administrator to request access. Now, the permissions (Advanced Sharing -> Permissions) are set with "Everyone" having read access (same as the internal drive), so this doesn't make a lot of sense. Also of note, I have an SSH server on my computer (through Cygwin) and even through SSH (logging in as an administrator user) I cannot access /cygdrive/e (although /cygdrive/c is accessible). As a final note, the drive is of course accessible on the host machine (E:\), and also at \\Comp\E on the host machine.

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• Hibernate & Sleep broken after IE 9 RTM installation in Windows 7 x64.

  - by AKa

  I have a question about hibernation. I installed Internet Explorer 9 RTM x64 on my Windows 7 x64 SP1 desktop machine. After this, computer don't entry the hibernation or (hybrid) sleep state properly. After I hibernate the computer the monitor become blank screen and the keyboard and mouse are inactive. But the machine is still running and there isn't any possibility to switch them off as only with power button. But this is recognized on next start as ineligible because of log entry with message “The previous system shutdown at xx:xx:xx on ?xx.?xx.?x was unexpected“ and menu with safe mode option. I’m clearly not sure if it has something to do with Internet Explorer installation, but I’m definitely guaranteed that before of this I never had some problems with hibernation or (hybrid) sleep. In Windows logs isn’t something suspect. I switched the hibernation off and on, installed new drivers for mainboard, graphic and network card, checked the hard disk, nothing was helpful. This is really sad, beacuse I don't like to switch the computer completely off because it takes longer to boot. Any suggestions?

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• Issues with returned mail sent to web-based email domains

  - by Beeder

  My company is having issues with returned mail that we send out to external domains. A few weeks ago we replaced a firewall and changed ISP providers and began subsequently having issues RECEIVING emails from external sources because we hadn't updated our new IPs in the DNS records. After making the necessary configuration changes and setting up SMTP forwarding over port 25 to our mail server, everything was working fine up until a few days ago when we started having mail sent out returned to us. We aren't having any trouble communicating internally (to recipients on our domain) but it seems we're having trouble with outbound messages to web-based email recipients. (@hotmail, @live, @yahoo, @gmail...etc) Currently we are running Server 2003 SP2 and exchange 2003. I'm very unfamiliar with configuring Exchange and could really use some help in narrowing down the possibilities. I did some research and am becoming suspicious of Sender ID being the culprit due to our recent IP address change and the likelihood that Sender ID is identifying us as a fake domain. Am I going in entirely the wrong direction? Any input or guidance would be infinitely appreciated. This is the message that is returned when an outbound message fails...this particular one was sent to my @live.com account for testing purposes... Your message did not reach some or all of the intended recipients. The following recipient(s) could not be reached: [email protected] on 5/17/2012 3:02 PM There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. Unfortunately, messages from xx.x.xx.x weren't sent. Please contact your Internet service provider since part of their network is on our block list. I tried a reverse DNS lookup and found that we are set up as a Forward-confirmed reverse DNS. So do I just need to contact my ISP and have them correct their DNS records or is this something I can solve on our end??

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