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• Where is the actual content in a TCP segment

  - by packetloss

  When I email something or download a program, or do anything else over a network, where in the segment is the actual content? If I am emailing a 20KB word document, and the maximum data field size in a segment is 1500 bytes, does that mean it takes about 14 segments to mail my document wherever it is going? I get, I think, the OSI model and I have a decent grasp of the IP protocol. I think I understand the concept of header wrapping of each successive layer in the protocol stack. What I can't get a definitive answer to is where does the actual content go in a TCP segment? Is that the datagram? Maybe the fact I am asking proves I have no clue... Many thanks.

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• Configure SQL Server to Allow Remote Connections

  - by Ben Griswold

  Okay. This post isn’t about configuring SQL to allow remote connections, but wait, I still may be able to help you out. "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: Named Pipes Provider, error: 40 – Could not open a connection to SQL Server)" I love this exception. It summarized the issue and leads you down a path to solving the problem.  I do wish the bit about allowing remote connections was left out of the message though. I can’t think of a time when having remote connections disabled caused me grief.  Heck, I can’t ever remember how to enable remote connections unless I Google for the answer. Anyway, 9 out of 10 times, SQL Server simply isn’t running.  That’s why the exception occurs.  The next time this exception pops up, open up the services console and make sure SQL Server is started.  And if that’s not the problem, only then start digging into the other possible reasons for the failure.

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• July, the 31 Days of SQL Server DMO’s – Day 3 (sys.dm_exec_connections)

  - by Tamarick Hill

    The third DMV we will review is the sys.dm_exec_connections DMV. This DMV is Server-Scoped and displays information about each and every current connection on your SQL Server Instance. Lets take a look at some information that this DMV returns. SELECT * FROM sys.dm_exec_connections After reviewing this DMV, in my opinion, its not a whole lot of useful information returned from this DMV from a monitoring or troubleshooting standpoint. The primary use case I have for this DMV is when I need to get a quick count of how many connections I have on one of my SQL Server boxes. For this purpose a quick SELECT COUNT(*) satisfies my need. However, for those who need it, there is other information such as what type of authentication a specific connection is using, network packet size, and client/local TCP ports being used. This information can come in handy for specific scenarios but you probably wont need it very much for your day to day monitoring/troubleshooting needs. However, this is still an important DMV that you should be aware of in the event that you need it. For more information on this DMV, please see the below Books Online link: http://msdn.microsoft.com/en-us/library/ms181509.aspx

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• Solaris 11 Resources for System Administrators

  - by rickramsey

  Have too much to worry about? Let us lighten the load. OTN's job is to filter through all the available resources and take you straight to the content that will help you do your job. For starters ... Oracle Solaris 11 Documentation Library Rock-solid instructions and background from the best tech writers in the business. Includes: Getting Started (including What's New and Release Notes) Installing and Updating (includes info about IPS) Administration Guide Security Guide Working With the Desktop Developing Applications for Solaris 11 Reference Manuals Important Information from Previous Releases Related Information Legal Notes Oracle Solaris 11 Training Oracle University offers training and certification for sysadmins at all levels. If you're familiar with Oracle Solaris 10, these courses are the best way to become familiar with Solaris 11: What's New in Oracle Solaris 11 (self-study) Transition to Solaris 11 - classroom and virtual Solaris 11 Administration - classroom and virtual Solaris 11 Advanced Administration - classroom and virtual These are the education paths for Oracle Certifications on Solaris 11: Oracle Certified Associate Oracle Certified Professional Courses for Solaris System, Network, and Security Administration - scroll to bottom of page for Solaris courses Indexes and Feeds of Our Best How-To Articles We update these indexes and feeds only after we read through the available content and select the best. These are our personal recommendations by topic, product, or audience. We'll be adding content about Oracle Solaris 11 in the coming days and weeks. Keep an eye out. All Systems Indexes Solaris 11 Collection All System Feeds OTN Systems Community Home Page Our Home Page is the same as the front page of a newspaper, but without the advertising. Latest articles, latest useful content from the community, plus links to all the other resources available on OTN. ... And If You Want to Be The First To Know After we select the best content, the first thing we do is hang out at the OTN Garage and talk about it.  Every once in a while we talk about cool cars and motorcycles, too: On Facebook On Twitter On Our Blog - Rick Ramsey Website Newsletter Facebook Twitter

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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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• DFS replication initial step problem

  - by vn

  Heya, I just setup DFS on my network and it's working fine, and now I'm trying to setup DFS-R on a test folder, but then at the end of the procedure (all went fine, selected my 2 folders, primary folder, replication topology and such) I get this error message (roughly translated from french) : Unable to define security on the replicated folder. The shared administration folder doesn't exist. I'm also wondering if there's any required security on the folders to replicate so that DFS-R can access it. I was trying to add SYSTEM in the security, but it won't find it/allow me. The folder has many many files and folders on the primary DFS pointer, but none on the 2nd, just created it with quite the same rights. Note that the primary DFS pointer is on a 2008 server and the DFS service and the secondary DFS pointer are on a 2008r2. Any help is very appreciated, thanks.

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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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• Accessing A Shared Directory That Has An Account White List

  - by Xan

  I'm on a LAN here at work and I have my desktop sharing some of my project folders. I can access the computer via \\ComputerIP\, but I can't actually open any of the folders. Upon attempting, I get the error: Windowns cannot access \ComputerIP\ProjectFolder You do not have permission to access \ComputerIP\ProjectFolder. Contact your network administrator to request access. For more information about permissions, see Windows Help and Support Now, this is understood considering I've made it so that you had to utilize the "Project" credentials to connect. I have a user account on my main computer hosting these shared folders that gives full access to the folders if you are this "Project" user. I can Remote Desktop the computer just fine from my laptop using either set of credentials. When I try to open these folders it doesn't give me the option to attempt to apply any credentials like it does when I remote desktop. How am I supposed to gain access to these folders?

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• IPv6 static routes

  - by user98651

  I am looking to configure a few hosts with IPv6 on my network. The router (running CentOS 5) is configured with an Hurricane Electric (HE) tunnel which works fine on that host. However, I would like to statically add a few additional hosts on the same LAN to have IPv6 through this tunnel. No, I don't want radvd or dhcpv6 to do the work for me in this case. I already have IPv6 forwarding enabled in sysctl.conf. I am looking for help with the next steps (statically adding the routes). Lets say the IP addresses are as follows: Router: 2001:470:1b07:1:: Host1: 2001:470:1b07:2:: How would I go about making them see each other? Thanks in advance for the help.

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• Browsers not responding

  - by Jesper

  Hello, Strange thing started to happen to my computer yesterday, and I can not recall installing anything new or updating anything the last few days either. It was first the browser, Chromium, that started to freeze up and not respond for ages, say 10 minutes. Then my email, Windows Live Mail client started doing the same thing, I click on an email and the program goes "not responding" for 5-10 minutes. At first I thought it was Chromium, so i reinstalled it but no help, So i installed Opera and thought I would give it t a try, but not same thing is happening to Opera so it is clearly an OS issue or/and internet connection issue. Does anyone know what the problem can be? Im running Windows 7 32bit on a dual core Sony vaio laptop with 4gb ram. There is nothing wrong with the actual internet connection as it works fine on other computers on the network, and the connection it self does not drop. Grateful for any help, Jesper

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• Unknown Host Error, is this a registrar problem or a host problem?

  - by jerrygarciuh

  Hi guys, I am dealing with a barrel of weasels on this one. Ad agency registered the domain in mid-August with Network Solutions. 72 hours ago I updated the DNS to point to a host provided by an associate of the client whose credentials are dubious. The DNS servers are at NETSONIC.NET (NS1 and NS2) and respond to ping no problem. I can FTP to the server using its IP but the name is no go. The name is also no go for tracert and ping: tracert voodoobbqfranchise.com Unable to resolve target system name voodoobbqfranchise.com. ping voodoobbqfranchise.com ping: unknown host voodoobbqfranchise.com I called NetSol and of course their tier one guy swears it must be the host but I insist that an unknown host must be a NetSol issue. Otherwise we'd get somethng like an httpd_conf error after being routed to the Netsonic server. Am I right? Is this an issue at the registrar? TIA JG

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• Linux box acting as wireless access point to share the internet connection

  - by Suresh

  A linux machine is connected to internet over two interfaces ppp0 and ppp1 using two modems. Also this machine acts as wireless access point through an interface say, eth0 with ip address 192.168.1.1 and acts as gateway for the connected devices through this network with subnet mask 255.255.255.0 Now is it possible to achieve the following: When any of the connected devices through wireless AP needs internet connection linux machine has to use ppp1 interface for internet. If any of the applications on the linux machine needs internet connection linux machine should use ppp0 interface for the internet. Can this be achieved by adding rules to chains in filter/nat tables? If the kernel routing table has a default rule to route the default traffic through interface ppp0, wil kernel completely ignore ppp1 for internet? PS: new to networking and routing concepts, If the question is not clear leave a comment, will try to give more information.

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• Increasing FreeBSD threads

  - by sh-beta

  For network apps that create one thread per connection (like Pound), threadcount can become a bottleneck on the number of concurrent connections you can server. I'm running FreeBSD 8 x64: $ sysctl kern.maxproc kern.maxproc: 6164 $ sysctl kern.threads.max_threads_per_proc kern.threads.max_threads_per_proc: 1500 $ limits Resource limits (current): cputime infinity secs filesize infinity kB datasize 33554432 kB stacksize 524288 kB coredumpsize infinity kB memoryuse infinity kB memorylocked infinity kB maxprocesses 5547 openfiles 200000 sbsize infinity bytes vmemoryuse infinity kB pseudo-terminals infinity swapuse infinity kB I want to increase kern.threads.max_threads_per_proc to 4096. Assuming each thread starts with a stack size of 512k, what else do I need to change to ensure that I don't hose my machine?

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• Fsck stuck on "Clone Multiply-claimed blocks"

  - by user3436581

  Update: I fixed the issue. But I don't see eth0 directory in /sys/class/net Any idea how to fix that? I could not bring up eth0 and I need it badly so that I can backup everything over the network since I'm working on VM console. This virtual machine sda1 is stuck. I've tried e2fsck and fsck and both gets stuck after "Clone multiply-claimed blocls? yes" I've waited for around 5 to 8 hours and it still the same. I could not mount the filesystem without fixing these errors. I'm doing this after un-mounting all filesystems in rescue mode.. Reboot does not help. Any suggestions? Screenshot: http://i.stack.imgur.com/lgixr.jpg Alternative screenshot url: http://s27.postimg.org/grk4p9eeb/error.png

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• Firefox "auto-complete" is very slow

  - by netvope

  Firefox version: 3.6 My places.sqlite is rather big (114MB, after being optimized by SpeedyFox.) If I turn on auto-complete, it may take 1 or 2 seconds for Firefox to accept a newly typed URL. To reproduce the issue: Type a URL into the URL bar, press enter. Nothing happens, and Firefox consumes 100% CPU (actually 50% of 2 cores) for 1 to 2 seconds Then Firefox start the network connection and load the webpage. Since it consumes 100% CPU, I don't think the bottleneck is the disk. I have some experience with SQLite and I know a 100MB DB is very small. To achieve the delay Firefox must be doing some expensive processing or inefficient queries. The issue does not appear if: auto-complete is turned off, or the URL is frequently used, or a new profile with no history is used Does anyone have any idea how to solve the problem? Should I file this as a bug? I don't want to give up my 100MB history, but I don't want to give up auto-complete either :)

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• OSSEC agent behind NAT

  - by Eric

  I am working on an OSSEC deployment where I will have multiple agents behind 1 public IP. Below is an example of the setup Private Network OSSEC-Agent1 (192.168.1.10) OSSEC-Agent2 (192.168.50.33) OSSEC-Agent3 (10.10.10.1) Those IPs NAT to 1 public IP (1.1.1.1) Then 1.1.1.1 talks to the public OSSEC server on 2.2.2.2 I've read some OSSEC documentation talking about NAT here, but it doesn't tell me exactly what I need to know. Their example is using an entire /24 subnet and mine will mainly have multiple agents to only 1 public IP. With the setup so far, I brought Agent1 online fine and it is communicating to the OSSEC server. However Agent2 continues to fail trying to connect to 2.2.2.2. Even though when I added the key, I had the correct name for it, so I know it talked to the portal at least once for that information. I'm assuming it's just getting confused with the multiple keys to 1 public IP. I basically want to know if this is possible and/or if I'm just overlooking something simple. Any help would be greatly appreciated.

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• How do I resolve active directory connection errors when using dcpromo?

  - by Middletone

  When attempting to promote a secondary server to an existing active directory forest I receive the following error message and can no longer continue. Failed to examine the active directory forest. Value ridMasterDSA.partentDN not found What can cause this and what can be done to fix it? Both servers are 2008 running on x64 and can see each other on the network via their names. FYI: The firewall is turned off on both machines so there should be no issue there. Also the server that i'm adding is already a part of the domain. One server is already a domain controller but I want to add a second to it.

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• Is this information about me as a programmer concise and good enough?

  - by Nick Rosencrantz

  I not only want you to review my resume but please tell me what you think Google means when they answered me: "We don't look at personal letters and we like your resume and we can recommend you internally but we need measurable experience. What is meant with "measurable" here? Do they mean like O(1) compared to O(n), selling an entire company, grades or what? This is what I sent: Curriculum vitae Nick Rosencrantz Competence: System development, web development Technical competence: Java, Javascript, HTML, XML, CSS, AJAX, PHP, SQL, Python Employments: 2012- Mobile Innovation AB System Developer IT consultant (Java programmer) 2011-2012 Bnano International Ltd System Developer Python programming in Google App Engine 2008-2009 Sweden Island AB System Developer Programming C++ and Java EE components 2003-2007 Studies Stockholm School of Economics During studies worked as network technician at Effnet AB 2000-2002 Jadestone AB System Developer System development in Java/J2EE. In 2001: KTH, Assistant. Teaching application server programming in Java Enterprise + weblogic + Informix. 1999-2000 Studies KTH 1996-1998 Spray.se System development, Researcher 1995-1995 Finance broker Backoffice work with financial instruments 1993-1994 Computer & Audio-Technical Systems AB Programming, sommer job Education/Courses: Stockholm School of Economics, Master of Science diploma, KTH, Computer Science undergraduate studies Languages Swedish, English, also some German and French Born 1973, Swedish citizen I also have a project-based CS which is several pages long but the above is about what I was aiming for in the beginning when I was looking for a job, now I have employment as an IT consultant in central Stockholm and I want to make my resume concise and also know what Google meant with their answer (It was a Swedish Google employee that via linkedin recruited from my Stockholm School of Economics groups since that is a small elite economics school where I took my M.Sc. and KTH is one of the largest universities in northern Europe so I sent her a link with my CV and she said she could promote me internally if I added "measurable experience" and I've been thinking for weeks what that may mean?

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• Whew.... what a week!

  - by [email protected]

  Last week was a busy week for the UPK and Tutor teams at Oracle. It started with the the Collaborate Conference in Las Vegas and ended with our first UPK and Tutor Customer Advisory Board (CAB) meeting at Oracle HQ. The Collaborate Conference is a yearly event sponsored by three of the largest Oracle User Groups. • Oracle Applications User Group (OAUG) • Independent Oracle User Group (IOUG) • Quest - International User Group The User Groups are completely user run organizations with Oracle participation. If you've never attended a conference, time to start planning for the 2011 event in Orlando! If that's out of your reach, there are many regional and industry user groups that meet on a regular basis. They offer a great way to get involved, network with other users, and increase your knowledge around the Oracle applications. For a list of groups near you, check out the Oracle User Group Center. I'll add that the biggest meeting of Oracle users is at the Oracle Open World Conference in San Francisco in September, where we will have many UPK & Tutor focused development and customer sessions. More information on Oracle Open World will be forthcoming over the next few months. We hope to see many of you there! The CAB was a first for the UPK and Tutor team. Although we speak with customers regularly, this gave us an opportunity to meet in a more formal setting to discuss industry trends, business issues, and the direction of the products. Members serve a 2 year term and are required to attend 2 meetings per year, one in person, one via phone. We have some tweaking to do to our meeting format (most members wanted it to be longer!), but the overwhelming consensus was that it was a great success. There were many experiences and ideas shared and the wheels of the UPK and Tutor Development teams have been turning ever since. I'm sure you will see some of these discussions result in new product features over time. What a great week!

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• Are there any FIPS-140-2 certified solutions for Linux?

  - by Mark Renouf

  I'm not even 100% certain what this involves, but my current understanding is this: use of only approved cryptographic algorithms for network traffic (easy, we use SSL and lock down the algorithms to only the really strong ones). Some form of physical data protection, involving disk encryption and physical tamper evident packaging. Obviously we're on our own if we need a tamper-proof product. But what about software for encrpytion. My guess is just using LUKS (although secure) will not be certified because it's open source (gov't seems a bit biased towards proprietary solutions here). Guardian Edge was mentioned by someone, but that appears to be complete Windows-based. So we need something like it, certified FIPS-140 compliant we can use on Linux.

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• Does HP 8530w support Wifi 802.11n?

  - by FoxyBOA

  According to vendor site HP 8530w supports 802.11n draft mode. My Windows 7 tell me that network card is 5100 ABG and know nothing about N mode (guys from Intel forum mentioned, that 802.11N versions must ended with N letter, e.g. 5100 ABN). Not sure if it matter, but my laptop model id is #FU462EA. How could I check that my Wifi card compliant with 802.11n (I suspect that "draft N" could have two "special" meaning: doesn't work with 802.11n at all or requires special activation of the mode). Any hints are welcome.

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• Remotely turn on a device that is powered off?

  - by njboot

  Verbatim from the interview between Brian Williams and Edward Snowden last night: Snowden: Any intelligence service in the world that has significant funding and a real technological research team can own that phone [refering to Williams' iPhone] as soon as it connects to a network; it can be theirs. Williams: Can anyone turn it on remotely if it's off? Snowden: They can absolutely turn it on with the power turned off on the device. I concede Snowden's first point, fine. But the last? Does Snowden's last claim, that a powered off mobile device can be remotely turned, have any merit? It seems highly improbable and seemingly impossible.

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• Oracle Open World 2013 - JD Edwards at Your Fingertips

  - by KemButller

  The Oracle & JD Edwards Universe at Your Fingertips!  Oracle Open World features thousands of sessions from which attendees can choose, including keynotes, technical sessions, demos, and hands-on labs. Hundreds of exhibitors will be on hand to share what they’re bringing to the leading edge of Oracle technology. You will have an infinite number of opportunities to network, trade information with peers, and gain insights from experts. For JD Edwards’ customers this valuable experience is twofold. Enjoy the convenience of attending the core JD Edwards’ program featured at the Intercontinental Hotel and experience the keynotes, educational sessions, networking events and partner solutions exhibited at the adjacent Moscone Convention Center.  Highlights for JD Edwards Customers:  Kickoff with the JD Edwards General Session, followed by product strategy road map sessions.  Select from over 60 educational sessions specifically applicable to JD Edwards.  Deepen your knowledge by attending the JD Edwards EnterpriseOne technical hands on lab sessions including: o One View Reporting – basic and advanced o EnterpriseOne Page Generator o User Interface Personalization o Configuring Composite Applications with Café One  Chose from thousands of educational sessions offered throughout the entire conference covering Oracle applications, industries, middleware, server and storage systems and database.  Meet the JD Edwards experts in the Oracle DEMOGrounds and get hands on experience with the latest and hottest features in Applications, Tools and Technologies, Mobility, In-Memory Applications, Health and Safety Incident Management, User Experience and Reporting.  Visit the JD Edwards Partner Pavilion at the Intercontinental Hotel featuring partner organizations with solutions for JD Edwards’ customers.  Meet with the Oracle JD Edwards Upgrade team during the conference as part of the Upgrade Care Program. Maximize your conference experience and leave with the information and contacts you need to turbo-charge your upgrade planning. Contact Barbara.canham-AT-oracle-DOT-com prior to the conference for more information.  Arrive on Sunday to participate in sessions presented by the Special Interest Groups of Quest International User Group. Oracle OpenWorld

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• MAC computer is not seeing the Ubuntu(computer) samba share in SHare

  - by Mirage

  I have ubuntu with samba installed. Initially My Windows were not able to see Ubuntu on my network list. After searchinga lot i found that i had to write this line in smb.conf and it worked "ldap ssl = No" Don't know why. Now my MAC is also not able to see ubunut but if click on connect to server and use smb://servername then my connection is established. Now is there any thing which i can do so that MAC can see ubuntu in share and i don't need to use connect to server thing.

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• DSL PPPoE connection not working?

  - by Mussnoon

  I use a wired PPPoE connection to connect to the Internet. What I need to do on Windows to connect to it is put in static IP address, gateway, subnet mask and DNS servers for my LAN card. Next I have to create a dialer for a PPPoE connection, put in my user name, the service name and the password, and "dial" this connection. And it works fine. On Ubuntu 10.04, however, I have tried setting things up in a similar fashion - put in all static addresses for the "automatic" wired connection, then put in user name, service name, password for a "DSL" connection. It worked for a while, then stopped. I have tried putting in all the details within the DSL configuration dialog, same thing happened - it worked for a while, then stopped. I have tried deleting the ethernet connection and only keeping the DSL one with all the numbers put in place, same thing happened - it worked for a while, then stopped. Each of the times, when it connected, it connected randomly, after trying a few times, and either stopped working within a few minutes, or after I had rebooted. I have deleted and remade the connection dozens of times - even with different names, but nothing seems to be working. I have also tried pppoeconf from the terminal, didn't work. I have checked /var/log/kern.log, but nothing changes in the file when I try to connect. I have also checked /sbin/route, but gedit can't even open it (says it can't figure the character encoding...). The "connection established" notification pops up from the top right corner, the same way as when the computer is actually connected to a network. Can anyone figure what's wrong and how it can be solved?

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