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• Can IP v4 and IP v6 share a single physical Ethernet?

  - by sleske

  I keep reading about the transition from IP v4 to IP v6, and the possible advantages and problems. One thing that keeps popping up is "dual-stack" networking, meaning (I believe) a host can speak both IPv4 and IPv6. I don't quite understand how this works, however. Can a host actually transmit using IPv4 and IPv6 at the same time over the same physical Ethernet (like e.g. HTTP and FTP can be used simultaneously)? Or is the physical network strictly IPv4 or IPv6, with the "other" protocol sent via tunneling?

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• Working with Git on multiple machines

  - by Tesserex

  This may sound a bit strange, but I'm wondering about a good way to work in Git from multiple machines networked together in some way. It looks to me like I have two options, and I can see benefits on both sides: Use git itself for sharing, each machine has its own repo and you have to fetch between them. You can work on either machine even if the other is offline. This by itself is pretty big I think. Use one repo that is shared over the network between machines. No need to do git pulls every time you switch machines, since your code is always up to date. Never worry that you forgot to push code from your other non-hosting machine, which is now out of reach, since you were working off a fileshare on this machine. My intuition says that everyone generally goes with the first option. But the downside I see is that you might not always be able to access code from your other machines, and I certainly don't want to push all my WIP branches to github at the end of every day. I also don't want to have to leave my computers on all the time so I can fetch from them directly. Lastly a minor point is that all the git commands to keep multiple branches up to date can get tedious. Is there a third handle on this situation? Maybe some third party tools are available that help make this process easier? If you deal with this situation regularly, what do you suggest?

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• Ubuntu 9.10 Dowload Speed Very Slow

  - by Don

  I'm running Ubuntu 9.10 desktop and I'm new to the Linux world, so bear with me. I'm on a corporate network of 3 T1s shared across 50-60 users. I typically get about 300 KB/sec for downloads, but for whatever reason, the Linux box will start out in that range, then drop to less than 1KB/Sec sometimes. Doesn't seen to matter where I'm downloading from. Right now I'm trying to get Eclipse for PHP and it's running at 3-6KB/sec. Getting the updates for the system will also drop to very slow rates. Our IT person has set up the machine to get the same 10.0.0.x address when it starts, and moved this IP to bypass our Proxy/Firewall going out, so that shouldn't be the issue. Can anyone recommend something I can try to better diagnose the problem. Again, I'm new to the Linux world and the hardware/OS setup side in general (coming form more of a coding background). Thanks for any advice.

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• Setting up a VPN tunnel between a Linux box and a Cisco FW

  - by Meni

  Hi. I have a linux box (ubuntu) and I have a service provider that will only allow an IPSEC tunnel connection between his network and my linux box. I have these details from the service provider: Service Provider: Peer IP – Lan on service provider's side - 10.10.10.10/24 Linux box details: Peer IP - Lan - Connection details: Phase1: Sha Aes 128 DH - group x Preshared – Lifetime – 24h Phase2: Sha Aes 128 Lifetime – 1h I am not sure which app I need to install on the linux box that will support this type of connection. Any ideas? Thanks!

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• Can't connect to the internet in Windows Vista

  - by Kola

  I have a Windows Vista computer which i have used for about 2 years without any issues. Recently, i started having problems connecting to the internet with this Vista computer. My other XP Computers are fine and can connect to the Internet. Regardless of wired or wireless connection, i am unable to get the Vista computer connected to the web. The Status remains "Limited" for IPv4 and IPv6. It also shows unidentified Public Network, and is able to connect to the router. However, there's a disconnection between the router and the internet. Any help will be greatly appreciated, i have been on this for 4 weeks now.

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• Hide unauthorized folders from view in webdav

  - by eric.s

  We have a Windows server running webdav. When a Mac connects to it they see the folders they do not have access to as a blacked out folder, and then the folders they do have access to as folders. This does not happen when a client using Linux or Windows connects. All users connect with their domain account credentials. I may not be searching properly to get the information I am looking for, so I turn here. Is this an issue that I should be researching on the Mac side, or ask our network team to be looking into settings on the server?

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• Configure browser and VPN traffic

  - by Zachzor

  Hello everyone. I've been having a few issues with my company's VPN server. The VPN is running on a Mac Server (10.6.x) and I'm also using a Macbook (10.6.5). I've been building specific programs to gather information from IPs, and to work on this while I'm at home I need to go through our VPN to access the network. Unless I send all traffic over VPN, I'm not able to hit those specific IPs. However, I'm unable to access the internet through my web browser when I send all my traffic over VPN. I was wondering if there was a way (besides setting up a split tunnel) that I could set up a web browser to go through my current wireless connection, as opposed to going through the VPN like the rest of my applications. Wether the browser be Chrome, Firefox, or Safari doesn't matter to me. Anyone else run into this issue and find a clever way to solve it? Thank you!

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• Backup solution

  - by user66115

  We are currently looking for a new backup solution. Our current network is 5 remote location with a tape backup in each plant. Right now we are looking at a MPLS VPN and running backups out of our main plant. The main thing that we backup are user private folders and department files. And each plant has it's own file server that houses CAD drawings. My main plan is to have every thing but that CAD drawing at the main faculty. We would start with a main backup of the drawing files and then do change backups back to the main plant. Besides tapes what would be the best way to backup. Our contact at Pc Connection is point us toward a Tandberg Data device.

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• How to configure postfix to dynamically choose different relayhosts?

  - by user24315

  I use my laptop at work on wireless and wired networks, at home on a wireless network, and at various other places (such as conferences, friends houses, etc). When at work I'd like postfix to use the corportate mail server to route emails. When at home I'd like it to use my personal mail server to route emails. When elsewhere I'd like to have the laptop attempt to deliver email in the normal smtp fashion. Is this possible using just postfix? Do I need something else (such as Lamson http://lamsonproject.org/, or scripts that dynamically patch my postfix configuration) when I want to do routing that depends on my current location?

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• X crashes and GNOME loses all its configuration

  - by Oli

  About every 3 days on my desktop (always on), X crashes, gdm restarts and it dumps me at a login screen. When I log in Gnome appears to have lost a lot of its settings: it plays sounds in weird places, UI elements look like they're from the 90s (GTK+ defaults) and it's generally pretty hideous. Note everything works fine. It's not like my profile doesn't exist because I can browse the internet fine (Firefox knows my bookmarks, history, passwords, etc) and my desktop is unscathed (apart from the icon theme). Manually restarting gdm doesn't fix this. I have to do a full reboot. Now I'm almost certain that this is a nvidia issue causing X to baulk (I've seen similarish threads on nvnews) and I'm happy with that (my fault for running their latest drivers all the time). What I'm concerned about is why Gnome looks so fugly. Is there anything I can do to force it to reload its settings without restarting the whole computer. Restarting is an issue for me as I run several daemons that other computers on the network depend upon. This is what I mean by ugly/fugly... Look at that scroll bar!

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• Windows 7 - ICS - Xbox360

  - by Hailwood

  I am trying to connect my xbox360 to the internet through ICS using my laptop. I have done this a few days ago using the exact same hardware(so no hardware problems) The laptop can browse the internet. The laptop gets its settings though DHCP. I have enabled ICS on the Wireless connection (where the internet is coming from) I have set the xbox and the Wired connection on the laptop to obtain settings automatically. The issue is that the Wired connection only shows 'Unidentified Network'. What could i be doing wrong?

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• iTunes Home Sharing with VPN

  - by Philip Crumpton

  I'm trying to set up a VPN on a Windows machine that contains my iTunes library, then connect my iPhone ot it, wirelessly, using Home Sharing (remotly). I have read that this can easily be set up if the iTunes library is on a Mac (Network Beacon and YazSoft ShareTool are two products I found). I can't find anyone who has had success on a Windows machine, though. In my thinking, there are a few options to getting this done. Find a utility that takes care of this for me (like the Mac-only options listed above) and is compatible with iPhone (Hamachi is NOT compatible with iPhone VPN). Manually configure a VPN to allow Bonjour multicast (I'm not sure what this really is...) Emulate a Mac on my Windows PC. FYI my router is a Linksys WRT54GL running Tomato 1.28 Note question is related to this

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• Suggestion for live video stream aggregation/switching/forwarding/management software?

  - by deceze

  I'm looking for a software or system that can receive video streams from a number of cameras via a network (RTMP or similar protocol), present a visual overview of all video streams and allow me to forward/send a selected stream to another service (e.g. to a Flash Media Server, or anywhere via RTMP). Basically the digital internet equivalent of a TV studio control panel, which allows a director to put together a live show. Is there any such software at an affordable price? A GUI-less server which can be scripted to switch streams would be good too. I'm not even quite sure what kind of product category this falls into or what search terms to plug into Google. Most results I have come up with have little more than an executive summary description which doesn't tell me anything. Any suggestion welcome.

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• Oracle EZConnect in Mediawiki

  - by raindog308

  Mediawiki supports Oracle and I'm trying to configure it in the installer. The installers says you can use EZConnect...something like: user/pass@//server.example.com/dbname or since the installer has fields elsewhere for user/pass server.example.com/dbname The installer includes a link to the EZConnect docs: http://docs.oracle.com/cd/E11882_01/network.112/e10836/naming.htm. All the examples in that doc include a forward slash. But every combination I've tried results in an error like this: Invalid database TNS "sever.example.com/service_name". Use only ASCII letters (a-z, A-Z), numbers (0-9), underscores (_) and dots (.). I can't find any examples of EZConnect that don't include a forward slash. That error is from Mediawiki, not Oracle. I'm tailing the listener log and there is no connection made - Medaiwiki is returning an error without trying to connect. I'm using php OCI8 with the Oracle instant client. I don't have a tnsnames.ora setup for this client - which is kind of the point of EZConnect. I did write a test php script that connects via oci_connect just fine. Has anyone configured Mediawiki to use Oracle with EZConnect? If so, what did you use in the installer?

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• SQL server could not connect: Lacked Sufficient Buffer Space...

  - by chumad

  I recently moved my app to a new server - the app is written in c# against the 3.5 framework. The hardware is faster but the OS is the same (Win Server 2003). No new software is running. On the prior hardware the app would run for months with no problems. Now, in this new install, I get the following error after about 3 days, and the only way to fix it is to reboot: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.) I have yet to find a service I can even shut down to make it work. Anyone had this before and know a solution?

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• Reasonably Secure Alternative to Poptop PPTP Server for Ubuntu server and Windows clients?

  - by wag2639

  I have a poptp server running on a old Fedora server but I'm upgrading to an Ubuntu 10.04 server. I was wondering if there are any good, reasonable secure alternatives to poptop that in can install on our new Ubuntu server as a way to get VPN access from Windows clients (XP and 7) to get remote access into our Intranet. We only use the VPN to access files located inside the network; we do not need to use it as a proxy/gateway. I've looked into openVPN but it seemed way too complicated and I would prefer something built into Windows. A Windows 7 only solution is OK.

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• iptables, allow access from certain MAC addresses

  - by user788171

  Presently, I limit which clients can access my server by using IP addresses via iptables, only approved IP addresses can connect. However, the problem with this is if a client is on a laptop and goes to a different location, they can no longer connect because the IP has changed. For a variety of reasons, iptables authentication is the only option I have. Is there a way to restrict access by device instead of ip address. For instance, only allow certain MAC address to connect to port 5000. Is it possible to do this via iptables? Note, the computers are not on the same network, they could be connecting from anywhere in the world.

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• Adding Internal DNS server in Host file

  - by Param

  I have added Global DNS server ip address to one of my Desktop ( please see the Network configuration screenshot ). and after that i have added my both domain controller ip address in host file, and it is working fine. ( please see the below screen-shot for your reference ) Can you please guide, what problem can i face if i kept my configuration in this way. but i am wondering, can this setting can create a problem? because the computer will be able to reach corp.abc.com easily, with the help of host file.

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• Load testing nginx inside AWS

  - by andy

  I'm trying to load test nginx running on AWS. I need to try to optimise it to handle 1Gbps of inbound traffic. Currently I've got it to peak at 85Mbit/s by running nginx on an m1.large with 4 other machines hitting it by using ab with -i (for head requests) -k (keepalives) -r (ignore failed requests) -n 500000 -c 20000. I'm struggling to generate more than 85 Mbit/s traffic from 4 machines, yet when I do scp a large file I get nearly 0.25Gbit/s of traffic going over the network. Are there any tools or approaches that I could use to load test nginx that might generate more load? I'm only interested in inbound traffic, so perhaps a DoS tool could help if it chucks away responses? I'm hitting a very small (40 byte) static asset, and have peaked at handling 50K concurrent connections and getting 25k reqs/s when just using a single load generator machine.

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• How to stream multiple files on demand in VLC?

  - by romkyns

  Is there any way at all that I can set up VLC on a server PC in such a way that I can access a list of all my videos from another PC, and pick one to be streamed on demand? I've been pointed at this streaming guide (pdf), but it's pretty useless. For a start, most of the menus in those screenshots don't match the actual current version VLC, and then it sort of assumes you already know what you're doing. So far I managed to figure out how to stream a single file, which I must choose before watching on the server PC - pretty useless if you ask me! The impenetrable "UI" doesn't help either... (P.S. The reason I'm going for streaming rather than the very simple to set up network drive is described in this question)

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• HP Virtual Connect and VLAN Tagging

  - by JaapL

  We have a c7000 chasis with the ability to have 8 uplinks per ESX host. Only 6 are currenlty active. I have a Virtual Switch with multiple vlan port groups and all the VMs are working fine. Recently we've been asked to setup network load balancing for one of our VMs, so we had our Virtual Connect engineer activate the last two uplinks. We then created a new vSwitch and added the two new uplinks to this vSwitch. We then moved the VM to this new vSwitch, but we get no connectivity. What could be the issue? We also added the appropriate VLAN ID. The VConnect engineer says everything is configured correctly and networking TEAM says the appropriate trunking is setup, so we are at a loss...

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• New whitepaper: Evolution from the Traditional Data Center to Exalogic: An Operational Perspective

  - by Javier Puerta

  IT organizations are struggling with the need to balance the day-to-day concerns of data center management against the business level requirements to deliver long-term value. This balancing act has proven difficult and inefficient: systems and application management tools are resource intensive and traditional infrastructure management architectures have developed over time on a project by project basis. These traditional management systems consist of multiple tools that require administrators to waste time performing too many steps to handle routine administrative tasks. Operational efficiency and agility in your enterprise are directly linked to the capabilities provided by the management layer across the entire stack, from the application, middleware, operating system, compute, network and storage. Only when this end to end capability is provided will we experience the full benefit of a scalable, efficient, responsive and secure datacenter. Managing Exalogic is substantially less complex and error prone than managing traditional systems built from individually sourced, multi-vendor components because Exalogic is designed to be administered and maintained as a single, integrated system (Figure 1). It is at the forefront of the industry-wide shift away from costly and inferior one-off platforms toward private clouds and Engineered Systems. Read the full whitepaper "Evolution from the Traditional Data Center to Exalogic: An Operational Perspective". Full document is available for download at the Exadata Partner Community Collaborative Workspace (for community members only - if you get an error message, please register for the Community first).

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• New Whitepaper: Evolution from the Traditional Data Center to Exalogic: An Operational Perspective

  - by Javier Puerta

  IT organizations are struggling with the need to balance the day-to-day concerns of data center management against the business level requirements to deliver long-term value. This balancing act has proven difficult and inefficient: systems and application management tools are resource intensive and traditional infrastructure management architectures have developed over time on a project by project basis. These traditional management systems consist of multiple tools that require administrators to waste time performing too many steps to handle routine administrative tasks. Operational efficiency and agility in your enterprise are directly linked to the capabilities provided by the management layer across the entire stack, from the application, middleware, operating system, compute, network and storage. Only when this end to end capability is provided will we experience the full benefit of a scalable, efficient, responsive and secure datacenter. Managing Exalogic is substantially less complex and error prone than managing traditional systems built from individually sourced, multi-vendor components because Exalogic is designed to be administered and maintained as a single, integrated system (Figure 1). It is at the forefront of the industry-wide shift away from costly and inferior one-off platforms toward private clouds and Engineered Systems. Read the full whitepaper "Evolution from the Traditional Data Center to Exalogic: An Operational Perspective". Full document is available for download at the Exadata Partner Community Collaborative Workspace (for community members only - if you get an error message, please register for the Community first).

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• Information I need to know as a Java Developer [on hold]

  - by Woy

  I'm a java developer. I'm trying to get more knowledge to become a better programmer. I've listed a number of technologies to learn. Instead of what I've listed, what technologies would you suggest to learn as well for a Junior Java Developer? I realize, there's a lot of things to study. Java: - how a garbage collector works - resource management - network programming - TCP/IP HTTP - transactions, - consistency: interfaces, classes collections, hash codes, algorithms, comp. complexity concurrent programming: synchronizing, semafores steam management metability: thread-safety byte code manipulations, reflections, Aspect-Oriented Programming as base to understand frameworks such as Spring etc. Web stack: servlets, filters, socket programming Libraries: JDK, GWT, Apache Commons, Joda-Time, Dependency Injections: Spring, Nano Tools: IDE: very good knowledge - debugger - profiler - web analyzers: Wireshark, firebugs - unit testing SQL/Databases: Basics SELECTing columns from a table Aggregates Part 1: COUNT, SUM, MAX/MIN Aggregates Part 2: DISTINCT, GROUP BY, HAVING + Intermediate JOINs, ANSI-89 and ANSI-92 syntax + UNION vs UNION ALL x NULL handling: COALESCE & Native NULL handling Subqueries: IN, EXISTS, and inline views Subqueries: Correlated ITH syntax: Subquery Factoring/CTE Views Advanced Topics Functions, Stored Procedures, Packages Pivoting data: CASE & PIVOT syntax Hierarchical Queries Cursors: Implicit and Explicit Triggers Dynamic SQL Materialized Views Query Optimization: Indexes Query Optimization: Explain Plans Query Optimization: Profiling Data Modelling: Normal Forms, 1 through 3 Data Modelling: Primary & Foreign Keys Data Modelling: Table Constraints Data Modelling: Link/Corrollary Tables Full Text Searching XML Isolation Levels Entity Relationship Diagrams (ERDs), Logical and Physical Transactions: COMMIT, ROLLBACK, Error Handling

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• Unable to remove/hide icons from desktop folder

  - by Kyomu

  I wish to hide some windows icons from my desktop folder1, but cannot. When I click delete, it says they will be deleted from my desktop (which they already are), but they remain visible in the desktop folder, which is where I wish them removed. Is there any way I can remove these? (I always use Win+E which really lets me get to all of these easy enough). Offending icons: Libraries, Homegroup, User folder, Computer, Network, Control Panel, and Recycle Bin. For those who might be wondering why, I find myself in this folder a bit to often (including when uploading a file), and find these nothing but clutter, especially as these always default to the top. Thanks for your help! 1 By desktop folder, I mean the folder you would see by going to "My Computer" and clicking "Desktop" on the top left under Favorites. Note: Changing my "Desktop Icon Settings" under "Personalize" does not affect the desktop folder, but rather just the desktop view.

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