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  • Potential impact of large broadcast domains

    - by john
    I recently switched jobs. By the time I left my last job our network was three years old and had been planned very well (in my opinion). Our address range was split down into a bunch of VLANs with the largest subnet a /22 range. It was textbook. The company I now work for has built up their network over about 20 years. It's quite large, reaches multiple sites, and has an eclectic mix of devices. This organisation only uses VLANs for very specific things. I only know of one usage of VLANs so far and that is the SAN which also crosses a site boundary. I'm not a network engineer, I'm a support technician. But occasionally I have to do some network traces for debugging problems and I'm astounded by the quantity of broadcast traffic I see. The largest network is a straight Class B network, so it uses a /16 mask. Of course if that were filled with devices the network would likely grind to a halt. I think there are probably 2000+ physical and virtual devices currently using that subnet, but it (mostly) seems to work. This practise seems to go against everything I've been taught. My question is: In your opinion and  From my perspective - What measurement of which metric would tell me that there is too much broadcast traffic bouncing about the network? And what are the tell-tale signs that you are perhaps treading on thin ice? The way I see it, there are more and more devices being added and that can only mean more broadcast traffic, so there must be a threshold. Would things just get slower and slower, or would the effects be more subtle than that?

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  • Resize a new database to predicted maximum size

    - by John Oxley
    Currently I have a SQL Server database which is about 2 Gb. I know over the next year it's going to grow to a maximum of about 10Gb. Hard drive space is not an issue in the slightest. Is there a down side to resizing the datafile to 20Gb now, then defragmenting the hard drive? Should I resize the log file to 1Gb as well? Something ridiculously large so that fragmentation doesn't happen there either. With this question I would like to avoid the datafile becoming fragmented on the disk itself, but I don't want to negatively impact performance.

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  • Forms authentication for main site, Windows auth for subfolder

    - by John D
    Hi all, On my Windows 2008 R2 server with IIS 7.5 I would like to have my ASP.NET website running with forms authentication, while protecting a subfolder with the basic Windows authentication. I have done this on Windows 2003 with IIS 6 for years, but I simply can't get it to work with IIS 7.5. Your input would be highly appreciated :)

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  • Square character

    - by John
    I have to write x/100000 with square character: x*10-5 ,but the '-5' should be above 10 so it is known that it is x/10/10/10/10/10. How do I do that?

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  • Does Xenapp require Windows Terminal Services (Remote Desktop) licenses?

    - by John Virgolino
    We have a Xenapp 5.x server running for over a year now. It does not have any purchased Terminal Services (Remote Desktop) licenses installed. It is running on a Windows 2008 Server box. I am aware that Terminal Services runs fine for about 3 months and then supposedly stops issuing licenses. On occasion, Xenapp stops working and we see lots of License errors in the event log, although not necessarily every time. In most cases, a reboot or 2 resolves the problem. We figured it was because of the lack of TS licenses. I spoke with Citrix and they said we had to have the licenses, but it begs the question that if we have to have the licenses, how does it work the majority of the time without them!!?? I have not received a straight answer yet and before I tell my client to shell out more money, I need to understand the technical reasoning for how this is actually working if we are breaking the rules here. We will buy the licenses if necessary, but there has to be an explanation for this. I am hoping the community can help where Citrix apparently cannot. Thanks much!

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  • Mercurial no longer working in NetBeans?

    - by John Isaacks
    I have been using Mercurial inside NetBeans for a while now. For the past few weeks now Windows Explorer has been crashing for various reasons, including every time I right click. Finally someone suggested I try uninstalling TourtoiseSVN and TortoiseHG since they affect Windows Explorer directly. I uninstalled both last week since I don't ever use them (I either user the NetBeans interface or use the command line interface.) Since then my Windows Explorer stopped crashing. Today I noticed that in NetBeans it is no longer showing me any of the Mercurial features. I pull up a command prompt and its not working their either. It seems like uninstalling TortoiseHG also uninstalled Mercurial altogether, which was not intended. I went to http://mercurial.selenic.com/wiki/Download to download the 64bit 1.8.4 .exe version of Mercurial for Windows. I installed it, and I can now use the command line. However it is still now working in NetBeans. Does NetBeans require Tortoise to work? Is there something else I am missing?

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  • Trying to build a history of popular laptop models

    - by John
    A requirement on a software project is it should run on typical business laptops up to X years old. However while given a specific model number I can normally find out when it was sold, I can't find data to do the reverse... for a given year I want to see what model numbers were released/discontinued. We're talking big-name, popular models like Dell Latitude/Precision/Vostro, Thinkpads, HP, etc. The data for any model is out there but getting a timeline is proving hard. Sites like Dell are (unsurprisingly) geared around current products, and even Wikipedia isn't proving very reliable. You'd think this data must have been collated by manufacturers or enthusiasts, surely?

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  • How can one restrict network activity to only the VPN on a Mac and prevent unsecured internet activity?

    - by John
    I'm using Mac OS and connect to a VPN to hide my location and IP (I have the 'send all traffic over VPN connection' box checked in teh Network system pref), I wish to remain anonymous and do not wish to reveal my actual IP, hence the VPN. I have a prefpan called pearportVPN that automatically connects me to my VPN when I get online. The problem is, when I connect to the internet using Airport (or other means) I have a few seconds of unsecured internet connection before my Mac logs onto my VPN. Therefore its only a matter of time before I inadvertently expose my real IP address in the few seconds it takes between when I connect to the internet and when I log onto my VPN. Is there any way I can block any traffic to and from my Mac that does not go through my VPN, so that nothing can connect unless I'm logged onto my VPN? I suspect I would need to find a third party app that would block all traffic except through the Server Address, perhaps Intego Virus Barrier X6 or little snitch, but I'm afraid I'm not sure which is right or how to configure them. Any help would be much appreciated. Thanks!

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  • The meaning of the first line output in the iwconfig command in Linux

    - by John Smith
    When I'm using the iwconfig command on my current wifi interface , wlan0 , the first line I get as output is wlan0 IEEE 802.11bgn. When I try to do this when I am connected to other WiFi's, I sometimes get other versions, like IEEE 802.11bg or IEEE 802.11abgn. I want to ask, what's the meaning of this output? if the output is IEEE 802.11bgn then it means that this WiFi supports both the b , g and n standards or it means something else? Thnaks :)

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  • What is the correct way to distinguish services to which RADIUS request belongs?

    - by John
    If I have 1 generic RADIUS server and a number of clients (VoIP server, VPN server, WIFI access point) how to distinguish senders (NAS) of access and accounting requests? I didn't found anything helpful by reading all related RFCs, there just NAS-IP-Addess or NAS-Identifier is required, but this attributes usually represents IP address of the NAS and this address can not be used as a robust identifier, because it's often possible to fall into the case when 2 different NASes are running on the same server and this attributes can not be customized. Any ideas?

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  • Why is my PC boot time slow when USB HDD attached?

    - by John
    I have a USB Hard disk that I am using as a secondary drive just for extra storage. When this is attached and I start my PC the second screen says searching for mass storage dives for about 5 minutes before continuing on. The same happens when I have a USB pen disk attached upon boot. If I attach the device after the PC has loaded then it is very quick however plugging and unplugging is not ideal. Is there away to disable this in the BIOS as I cannot instantly see an option. On boot it informs me I have an American Trends AMIBIOS in the BIOS setup it states the version as v02.58 2006. This is running on a ASUS MV2 Motherboard.

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  • Will the VMs on the ESXi cluster be running after disconnection from the network?

    - by John
    What will happen if I disconnect the ESXi cluster configured with HA from the switch(I need to change the power source on the main switch) and there is no management port redundancy? I'm going to disable the host monitoring and VM monitoring within HA settings, and connect to the switch after it boots up. Will the virtual machines be running if I disconnect the hosts from the network so they will not see any other ESXi host? I hope everything will work fine and the hosts will join the cluster after they connect to the network again, but I would like to be sure ..

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  • FTP permissions problem

    - by John Isaacks
    I have vsftpd installed on ubuntu. I added a new created a new user and set the users home path to /var/www so I can ftp with that user directly to that location. And that all works, I can now FTP with the user I created directly to that location. However I whenever I ftp, I have no permissions to change anything. How can I change that? Thanks!!

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  • Why is chrome slashing my HTTPS?

    - by John Isaacks
    In Chrome when I view my page the https in the URL has a red slash through it. When I click it, it says: Your connection to www.example.com is encrypted with 256-bit encryption. However, this page includes other resources which are not secure. ... I am not getting the mixed content warning in IE or FF. Is there a way to get Chrome to tell you exactly what/where is causing the issue? I am having trouble finding what is causing Chrome to throw a hissy fit. I searched my source for any http that does not contained https but am not seeing any. It would be nice if there is an easy way to pinpoint the issue.

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  • How to schedule server jobs more intelligently than with cron?

    - by John
    I run a job every minute to reindex my site's content. Today, the search engine died, and when I logged in there were hundreds of orphan processes that had been started by cron. Is there another way using some kind of existing software that will let me execute a job every minute, but that won't launch another instance if that job doesn't return (i.e. because the search engine process has failed)?

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  • How to run Medisoft Patient Accounting Demo on Windows 7?

    - by John
    I installed Medisoft Patient Accounting Demo but every time I try to run it, I get this error: tblExclusiveNew: One of the Database property or the AdsConnection property must have a value. I click OK and then get this error: Exception AdsConnectionError in module MW.EXE at 001FA701. Must specify connection string before getting a server connection. The program then immediately exits. Then a get this error: Ar3import -An error has occurred dmIPCCommunication: No core product found I click close and then: Ar3import-An error has occurred An unspecified error has occurred, please call tech support Googling was no help. Even the Medisoft tech on the Medisoft forum thread I found was unable to fix it. Is this fixable?

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  • Multiple desktops in Windows

    - by John Straka
    I'm running a program that uses WatiN to automate file uploads to different websites. I currently run it on a machine that I remote into via the standard Remote Desktop Connection in Windows - once I start an upload, I go ahead and continue using my local machine. Soon, I'll be needing to run it locally. The problem is that it requires focus (which is unavoidable due to WatiN utilizing SendKeys) and I of course don't want to render my machine useless while it runs. So, my question: Is there any way to emulate the multiple desktops/workspaces that have been in many Linux distros for some time? I tried VirtuaWin to no avail. Alternatively, is there a way to remote into a machine from itself? Or is there some other means of creating a separate session on the same machine that does not steal focus? Running Linux is not an option, and a VM would be overkill.

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  • Is setting an empty/blank DNS A record allowed?

    - by John
    I'm trying to wrap my head around the wonderful world on DNS. I have created a zone file for example.com which contains: @ A 1.2.3.4 * A 1.2.3.4 However I am also setting up my local DNS, local.example.com which I have created a separate zone file for containing the following: machine1 A 192.168.0.1 machine2 A 192.168.0.2 When I dig machine1.local.example.com it returns A record 192.168.0.1, great. Sadly, badmachine.local.example.com returns 1.2.3.4, as does local.example.com. I'm not sure of the best way to prevent this. If I add the following to the local.example.com empty A records are returned for the above 2 examples as is the behaviour I desire: @ A * A Is this allowed? Is this best practice, or am I doing things terribly wrong? I'm using PowerDNS with BIND backend. Thanks for your thoughts!

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  • NFS server hangs after 3 minutes

    - by John P
    I have a VPS running Centos 6.3 with a fully updated NFS. When I mount the NFS directory from the client, everything works perfectly fine for approximately 3 minutes, then the client hangs attempting to see the directory. nfs-utils-1.2.3-26.el6.x86_64 service nfs status rpc.svcgssd is stopped rpc.mountd (pid 2544) is running... nfsd (pid 2609 2608 2607 2606 2605 2604 2603 2602) is running... rpc.rquotad (pid 2540) is running... cat /etc/exports /home/user XX.XX.XX.20(rw,async,no_root_squash) The client is running Centos 5.8. The directory is mounted using mount x.x.x.6:/home/user /mnt When everything is working, I get the following on the client: /usr/sbin/rpcinfo -p X.X.X.6 | grep mountd 100005 1 udp 892 mountd 100005 1 tcp 892 mountd 100005 2 udp 892 mountd 100005 2 tcp 892 mountd 100005 3 udp 892 mountd 100005 3 tcp 892 mountd When it stops working, rpcinfo just hangs on the client, however running the above command on the server does return data. There are no logs on the NFS Server side that would indicate an issue. On the client side, I see: cat /var/log/messages kernel: nfs: server X.X.X.6 not responding, still trying The client and server are plugged into the same switch, however they are on different networks. The server is a VPS while the client is a dedicated box. SELINUX is in permissive mode on both client and server, and I've turned iptables off on the server to make sure that was not causing an issue. Any ideas would be helpful - right now I'm having to restart NFS every two minutes in a cron job to keep it semi working. Thanks

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