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• Dedicated NIC or dedicated port for iSCSI?

  - by Newt

  When spec'ing and configuring a machine that will utilise shared iSCSI storage, I've read a lot of documentation which suggests a dedicated network adapter should be used for iSCSI communication. That makes a lot of sense and I have no problem with it. The question I do have, is this - should that suggestion be taken to mean that a separate physical NIC should be used, or will a dedicated port/ports on a dual/quad port NIC be just as good? My suspicion is that simply using dedicated port(s) on a shared NIC would be just as good. Any input greatly appreciated.

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• OpenVPN performance: how many concurrent clients are possible?

  - by Steffen Müller

  I am evaluating a system for a client where many OpenVPN clients connect to a OpenVPN server. "Many" means 50000 - 1000000. Why do I do that? The clients are distributed embedded systems, each sitting behind the system owners dsl router. The server needs to be able to send commands to the clients. My first naive approach is to make the clients connect to the server via an openvpn network. This way, the secure communication tunnel can be used in both directions. This means that all clients are always connected to the server. There are many clients summing up over the years. The question is: does the OpenVPN server explode when reaching a certain number of clients? I am already aware of a maximum TCP connection number limit, therefore (and for other reasons) the VPN would have to use UDP transport. OpenVPN gurus, what is your opinion?

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• Load balancing and HTTPS strategies

  - by Dan

  I am faced with the following problem: Servers get saturated since current load balancing strategy is based on client IP. Some corporate clients access our servers from behind large proxies so all clients appear with same IP to our load balancer. I think we are using some hardware load balancing device (can investigate further if necessary). We need to maintain session affinity (site is constructed in ASP), so all requests with same IP get routed to the same node. Since all the communication goes over the HTTPS, no request data (like session Id) is available to balancer as a client discriminator. Is there a way to use some other data besides the IP to distinguish between clients and route the clients even when coming from same IP to different nodes? Note: I need to maintain the traffic between the balancer and nodes safe (encrypted).

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• WinXP How to Tunnel LPT over USB

  - by Michael Pruitt

  I have a windows program that accesses a device connected to a LPT (1-3) 25 pin port. The communication is bidirectional, and I suspected the control lines are also accessed directly. I would like to migrate the device to a machine that does not have a LPT port. I saw the dos2usb software, but that takes the output (from a DOS program) and 'prints' it formatted for a specific printer. I need a raw LPT connection, and a cable that provides access to all the control signals. I do have a USB to 36-pin Centronics that may have the extra signals. I use it with a vinyl cutter that doesn't like most of the USB dongles. It comes up as USB001. Would adding and sharing a generic printer, then mapping LPT1 to the share get me closer? Would that work for a parallel port scanner? My preferred solution is a USB cable with a driver that will map it to LPT1, LPT2, or LPT3.

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• Assigning static IP and domain name mapping to local server in LAN

  - by yashbinani

  I have developed a web application which will be deployed in a LAN environemnt. Clients will be Computers/Android Tablets/IPAD In order for communication between client and local server 1) need to assign a static IP to local server. 2) need a domian name mapping for that IP address in Local environment. 3) router should assign the same static IP if it gets restarted etc. I am using a windows XP machine as Local server OS. Do i need to take care of router configurations before buying one, or all routers will have same capability to perform this task. I am not a network specialist, so Sorry if this question sounds stupid. Thanks

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• Website Upgrade - Avoid Downtime

  - by nolan.sipos

  I have been requested to investigate how I can reduce the downtime of our website upgrades. We maintain a DNN site with both public facing pages and member only pages. The member only pages are directly linked to our core application database while the public pages are not. Our current process is to redirect website users as soon as the upgrade process begins, which includes Backup of the Prod DB Update Prod DB Update Executables (Application) Upgrade Website Application (If this requires an update) Install Dependencies Upgrade sub systems like communication engine and payment broker Update various configuration files Perform testing of systems Restart all services Allow access to site This process can take from 2 to 8 hours depending on upgrade required, scripts to be run, size of database and number or portals. My initial thoughts are to restrict users to read only pages and any update pages would be unavailable. Could anyone please offer suggestions as to the best practices for what I would think to be a common problem so that we can reduce this down time and if we need infrastructure changes, I can put this to our technical department.

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• Seperator in dock in osx

  - by sagar

  I have placed too many icons in my dock. there is by default a separator in dock between applications & trash. I want to add more separators in my dock - for grouping purpose. say for example finder, preview, itunes, system pref.,activity monitor FOR Mac osx group Mozilla, safari - for Browsing group Odesk, skype, ipmessanger, adium, team viewer for communication Means, I just want to add separator to identify them very quickly. Is it possible ? if yes - how ? Thanks in advance for sharing your knowledge. sagar

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• Locking down a box on the web

  - by glowcoder

  I'm a Java developer who is looking to put a game on the web. I'm not much of a web or server guy, though, and frankly I seem a little lost at where I should start with putting something on the web. My application works fine on my machine, and I'm sure I can make it work fine on any box I put it on. But the security of that box is pretty important. If I sign up for a standard hosting package (let's say from GoDaddy or something) can I simply tell them "make port 12345 open for communication" and let them handle the rest of the security details? If I can't, what are the things I'm going to need to know to prevent my game server from getting hacked to shreds? (Links to solid resources fine by me!) Thanks!

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• Network wide rule to forwared IP address

  - by Patrick

  Hi, we have a virtual machine which hosts a web based bug tracker in our network which is reached internally via e.g. 192.168.1.5:9800. From the outside we made a port forwarding in our firewall so that the web site can be reached via e.g. 72.10.10.10:9800. Now that works fine but the problem is that we got different IP addresses to reach the same service depending if we are in the office or at home and when the service sends out an email the link doesn't always work :) So we are looking for a solution to fix it. One could be to make a rule in out firewall that all communication to 72.10.10.10:9800 is forwarded to 192.168.1.5:9800... If that's possible that is considering it's an IP address + a port. The reason we used a port is because we only got one static public IP address but multiple virtual web appliances. Thanks for any suggestions or solutions :) Patrick PS: The network is a Win 2008 R2 domain by the way

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• development server?

  - by ajsie

  for a project there will be me and one more programmer to develop a web service. i wonder how the development environment should be like. cause we need central storage (documents, pictures, business materials etc), file version handling, lamp (testing the web service) etc. i have never set up an environment for this before and want to have suggestions from experienced people which tools to use for effective collaboration. what crossed my mind: seperate applications: - google wave (for communication forth and back, setting up guide lines, other information) - team viewer (desktop sharing) - skype (calling) vps (ubuntu server): - svn (version tracking) - ftp (central storage) - lamp (testing the web service) - ssh (managing the vps) is this an appropriate programming environment? and regarding the vps, is it best practice to use ONE vps for all tasks listed up there? all suggestions and feedbacks are welcome!

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• voice transmission using Wi-Fi in Ad hoc networking mode

  - by iam0hot

  We are looking to create Inter Vehicle communication system. So, a couple of vehicles should get connected automatically and could be able to share voice.. We decided to implement ad-hoc networking using Wi-Fi.. we are expecting it to cover a radius of 100 mts. If we could create a system like this.. and one of the user sends a voice information, does all people in the network get that ? What are the things we require to get this project done ?

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• Light Voip and IM server for small teams

  - by Sihan Zheng

  So I have a small group that would need a self hosted Im/voip and possibly video conferencing solution. My goal is for a small group of people (no more than 40) to be able to collaborate within a local area network. I need something that is self hosted, so unfortunately outside solutions like Skype and hosted Lync would not work. I'm looking for something that would allow both one on one, and group communication, so and IRC server would not work. I'm hopefully looking for something that does not require multiple servers, or is too complex to set up. As a student, I have a license of Lync 2013, but setting that up on a single server without active directory is practically impossible. Would Lync 2010 be easier to do on a single server? Are there any other good solutions? Thanks

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• Sharing information between nodes in Beowulf Cluster

  - by Alejandro Sazo

  I am setting up a beowulf cluster and I've been reading that it might be necessary to make the home directory of the cluster users shared between them (assuming this users are local to each machine). The other case is leave each user with its own home and the communication is up to the master node. Another idea that came up was to use an LDAP unique user logged on each machine in the cluster, that keeps the idea of the shared home between nodes (but is only one home of one user). Which approach is better for this kind of cluster? Edit: The cluster is running openmpi and it will support cuda and opencl

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• MySQL-5.5.10 - Lost connection to MySQL server during query (Both Web Clients and MySQL Slaves)

  - by kwiksand

  We've just upgraded our existing MySQL5.1 DB servers to newer (much better) hardware with MySQL 5.5, and things have been going mostly smoothly for almost 6 weeks. Just the last few days, I've noticed a few errors, such as: From a MySQL Slave: [ERROR] Error reading packet from server: Lost connection to MySQL server during query ( server_errno=2013) Or From Apache/Other: Lost connection to MySQL server at 'reading initial communication packet', system error: 110 At one point this evening, many webnodes reported this error for a three minute period (many such reports as this was in a busy period). However, the issues don't appear to correspond with any times of extreme load. For all intents and purposes, the connection/thread load on MySQL is at a normal rate (between about 10 and 40 connected threads), and Web load has been a LOT higher at times over the last few weeks. Could there bee other reasons for these connection errors, that I'm not seeing?

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• Linux does not communicate to Windows subinterface

  - by artaxerxe

  I set my NIC on Windows so that I have two interfaces: one (the first one) has IP 192.168.0.5 the other one has IP 10.10.10.1. On a Linux machine I set an interface to 10.10.10.2. On another Linux machine I set the interface to 10.10.10.3. And tried to ping those machines. Here is the result. Linux to Linux is ok. Windows to Linux also is ok. But Linux to Windows does not work. Can you help me on getting the communication between Linux and Windows? What should I do for this? I have to mention that those machines are connected through a switch. If you need any details, ask me please! Thanks in advance!

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• Windows 2008R2 two node failover cluster creation fails

  - by Francois Wolmarans

  We have just installed two Windows 2008R2 Enterprise machines with identical hardware. When running the cluster validation everything is ok. When creating the cluster it fails with the following error: An error occurred while creating the cluster. An error occurred creating cluster 'CLUSTER04'. The parameter is incorrect The logfile on the first node where we are running our config from, does not show any errors. On the second node we get: The Cluster service is shutting down because quorum was lost. This could be due to the loss of network connectivity between some or all nodes in the cluster, or a failover of the witness disk. I've double checked and all communication between the servers are fine. Even when creating a one node cluster it gives the error. There are other failover clusters we have setup without any issues.

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• securing server to server http post

  - by ad-inf

  Website is developed on JSF, Servlet, using apache web server. In my website, I accept data submission from few restricted websites using HTTP POST method. We exchange some secure key to ensure that correct source is sending data. But is there any way to ensure that the data is submitted from specific domain / IP address only? In application level I can check request.header('Referer') , but some proxy or firewall might hide the referer. Can this configuration done on firewall or webserver level to authenticate server to server communication? Eg. Say my website is a payment gateway website, integrated with www.abc.com. I want only abc.com to submit data. So a user using abc.com should be able to submit data to my website only through abc.com, and not any other website.

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• secure synchronization of large amount of data

  - by goncalopp

  I need to automatically mirror a large amount (terabytes) of files in two unix machines over a slow link (1 Mbps). This needs to be done frequently, but the data doesn't change too much (delta transmission doesn't saturate the link). The usual solution would be rsync, but there's an additional requirement: it's undesirable, from a security standpoint, that either the source or destination machines have (keyless) ssh keys to each other, or any kind of filesystem access. All communication between the two machines should thus be initialized (and mediated) through a third machine. I've asked a separate question about rsync in particular here. Are there other obvious solutions I'm missing?

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• Configure VPN to access remote LAN network on Windows7

  - by PiotrK

  Situation: I have two Windows7 machines (PC and laptop). I've set PC as VPN server and laptop as VPN client using default built-in W7 network tools. I've disabled use default gateway in remote network on client machine, so client don't try to route all communication through VPN. I've routed port 1723 (TCP/UDP) on NAT to my server and enabled IPSec/PPTP/L2TP passthrough I've put my laptop in indepedent network (basically I've connected it via 3G network), connected to VPN server and checked ipconfig /all I've get: IP Address: 192.168.1.101 Mask: 255.255.255.255 Gateway: (none) LAN mask in server LAN network is 255.255.255.0 - I am surely missing something obvious, but Google doesn't give me any good advices; How can I access local LAN network from remote VPN client? How can I access local shared documents?

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• NFS-Root not working when booting over PXE

  - by Randy

  I am desperately trying to get a diskless client running over PXE-Boot using a NFS-Share as a root file system. I did this before some years ago but for some reason I am stucked at this since days. The TFTP-Server itself is running fine and booting a netinstaller works also fine. The kernel and initrd are loaded also but the bootprocess stops with this (screenshot) kernel panic. I'm using the squeeze standard i386-Kernel and I have prepared the initrd with this config: MODULES=most BUSYBOX=y KEYMAP=n COMPRESS=gzip BOOT=nfs DEVICE= NFSROOT=auto I also tried MODULES=netboot with the same outcome. My PXE-configuration looks like this: LABEL linux KERNEL diskless/debian-default/vmlinuz-2.6.32-5-686 APPEND root=/dev/nfs initrd=diskless/debian-default/vmlinuz-2.6.32-5-686 nfsroot=192.168.140.2:/storage/nfs-boot-images/default-squeeze ip=dhcp rw Furthermore I have captured the network communication of the client via tcpdump and learned that the client isn't even trying to connect to the NFS-share. Does anybody has got an idea what is going wrong here?

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• In Debian, how can I route rtorrent to a certain network interface, say ppp0?

  - by Timo

  I have purchased a PPTP account from StrongVPN and configured the setup by these (http://pptpclient.sourceforge.net/howto-debian.phtml#configure_by_hand) instructions and now I want to have rtorrent do its communication to the Internet through this VPN tunnel. So I have a ppp0 interface, which has the VPN tunnel. What is the next step? I guess it has something to do with the routing tables? I am new to routing, so please be elementary and precise so that I understand! Thank you!

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• All nework interfaces hang for seconds while one interface goes up/down

  - by user3698377

  I am building a client/server application that uses several network interfaces in parallel for redundancy, and I have noticed that while one network interface goes down or goes up, the communication on other interfaces hangs for several seconds. I could reproduce this behavior without my application in a simple way: there are 2 interfaces available on computer 1 ( Ethernet and WiFi ) ping from computer 2 the IP address of the Ethernet connection of computer 1 disconnect the WiFi of computer 1 ping hangs for seconds, and then the packets are traveling again between the 2 computers. The hanging happens as well if I turn back on the WiFi connection on computer 1. It happens as well if I ping the WiFi IP, and turn off/on the Ethernet connection ( or unplug/plug the cable). I am using Linux Ubuntu 12.04 on both computers. Any ideas why is this happening, and if / how can it be avoided?

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• How secure is Remote Desktop from Mac OS X to Windows Server 2003?

  - by dwhsix

  It's unclear to me exactly how secure Remote Desktop access from Mac OS X to a Windows Server 2003 machine is. Is the communication encrypted by default? What level of encryption? Are there best practices for making this as secure as possible? I found http://www.mobydisk.com/techres/securing_remote_desktop.html but it's unclear how much of that is still relevant for current versions of RDP and Windows Server. I know I can tunnel RDP over ssh, but is that overkill or redundant?

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• recipient_delimiter in MS-Exchange

  - by guettli

  Most UNIX mail server support recipient delimiters behind a plus sign in email addresses. [email protected] In the above example "everything" could be any string, and the mail should get into the mail box of the user "user". In postfix it is called recipient_delimiter: http://www.postfix.org/postconf.5.html#recipient_delimiter Is this possible with Exchange 2010? Usecase1: The user can use different email addresses. He can use [email protected] for the communication with "fooshop". If he gets spam mail to this address later, he knows that fooshop has given his address to someone else. Usecase2: We run a ticket system ( http://tbz-pariv.de/software/modwork/ ) and want to add send scans via email to the system. The network scanner can only modify the to-address and we want to insert the ticket type like this [email protected]

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• ISP Load Balancing with ISA 2006

  - by Bill Best

  I understand that ISA 2006 has an integrated Network Load Balancing feature. We also recently acquired a second internet line through a second service provider. I know it is possible to purchase a NLB router for using both incoming lines but this is not the route we would like to take if at all possible. Thus, is it possible to have two ISA 2006 servers each with there own external connection, Load balanced to be viewed as one gateway? My thought was to have two ISA servers each with three NICs, one external, one internal and one for cross communication. I am under the impression that this should work but was hoping someone else has had experience with it.

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