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• PXE bootable image for terminal server?

  - by HeavenCore

  We have 300 windows xp machines on cruddy old hardware across the company. With extended support for XP ending April next year we're looking into our options. Couple of options: Replace the 300 PC's with full windows 7 PC's (£100k +?) - no use of terminal server (our current model) Replace the 300 PC's with off the shelf thin clients & make use of our terminal server - Cheaper clients but Terminal Server CALS required? Keep the 300 PC's, replace windows XP with linux thin client capable of connecting to our terminal server - no hardware costs, just Terminal Server CALS required? Keep the 300 PC's - remove hard drives and make use of a PXE bootable "thin client" to connect to our terminal server If we were to choose option 4, what our the options out there? Is there any official PXE bootable thin clients for terminal server out there? If so, what are the licence requirements? Is there options we haven’t considered? There must be lots of companies out there in this situation - curious what the current trend is for this problem? Edit: Option 5 - Create a bootable Windows PE image with RDP auto start and use that as a "thin client" for our terminal server - is Windows PE licence free in such a model?

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• Changing Domain Name DNS to Redirect web traffic to one server, and leave mail to original server

  - by David S

  Hi there, Ok, quite the idiot with DNS.. apart from the basics. I have a domain name hosted with a domain registrar. It seems to have full DNS control (i.e. ability to view/edit A Records, Mail etc..) We have recently setup a server at Rackspace which hosts the new website The original/existing server (where the old website still is and Mail) is on another shared hosting companies server I went to the domain name registrar, and checked out the DNS management as follows: click here to view the DNS screenshot So obviously the A Record is pointing to the actual server where the website/mail is I figure, and the CNAME is pointing (alias?) to the website url. So my question is this: If I want the web traffic portion to go to the Rackspace/new server, but keep the mail going to where it is now, what do I have to change? Also, should I even change this info at the domain registrar? the rackspace server account has full DNS which seems to suggest I can point to their nameservers and then re-direct the MX (Mail) traffic to where the mail server is? Sorry if that was a bit confusing.. obviously in need of DNS training ;) Any help very appreciated. David.

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• Serving images from another hostname vs Apache overload for the rewrites

  - by luison

  We are trying to improve further the speed of some sites with older HTML in order as well to obtain better SEO results. We have now applied some minify measures, combined html, css etc. We use a small virtualized infrastructure and we've always wanted to use a light + standar http server configuration so the first one can serve images and static contents vs the other one php, rewrites, etc. We can easily do that now with a VM using the same files and conf of vhosts (bind mounts) on apache but with hardly any modules loaded. This means the light httpd will have smaller fingerprint that would allow us to serve more and quicker, have more minSpareServer running, etc. So, as browsers benefit from loading static content from different hostnames as well, we've thought about building a rewrite rule on our main server (main.com) to "redirect" all images and css *.jpg, *.gif, *.css etc to the same at say cdn.main.com thus the browser being able to have more connections. The question is, assuming we have a very complex rewrite ruleset already (we manually manipulate many old URLs for SEO) will it be worth? I mean will the additional load of main's apache to have to redirect main.com/image.jpg (I understand we'll have to do a 301) to cdn.main.com/image.jpg + then cdn.main.com having to serve it, be larger than the gain we would be archiving on the browser? Could the excess of 301s of all images on a page be penalized by google? How do large companies work this out, does the original code already include images linked from the cdn with absolute paths? EDIT Just to clarify, our concern is not to do so much with server performance or bandwith. We could obviously employ an external CDN server but we have plenty CPU and bandwith. Our concern is with how to have "old" sites with plenty semi-static HTML content benefiting from splitting connections for images and static content via apache without having to change the html to absolute paths (ie. image.jpg to cdn.main.com/image.jpg happening on the server not the code)

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• Domain registrar transfering

  - by Mike Weerasinghe

  In 2004 I registered a domain name when I opened an account with DiscountASP.NET. I presume my domain registration was handled by a reseller. A domain tools who is search shows that registration services are provided by Znode LLC. I changed hosting companies and need to change DNS servers to point to my new hosting company but I have no idea how to do that. There is no control panel I can access. Ideally I would like to transfer registrar's. I emailed Znode support but I have not received any response. I called and left a message and they have not called back. My new hosting company wants an EPP authorization code in order to transfer my domain. I guess I need to get it from Znode LLC. Anyone have any ideas on how I might go about transferring my domain over to a new registrar? The domain name has not expired and is currently active. Thanks in advance for your help.

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• Looking for software to create a personal hotspot on Mac OS X (not using the built-in ability)

  - by Fred

  I got my nifty little MacBook Air today. Since I will be going on travel I was hoping to use my iPad 3G as screen extension with Air Display. It works being in a shared WiFi network. Sadly Apple is a bit restrictive on the tethering with their mobile devices such as the iPad. Now I read iOS 4.3 will enable the iPad to use tethered networks. But the feature will not be working for iPad 3G. I assume their big partner telecom companies fear everyone will quit their internet contract with them. So I want to create a personal hotspot on my MacBook and use it on my iPad. But the iPad is not able to use this network. The network is visible but not usable. On Windows there is this connectify program which lets the PC act as wireless router. Does anybody know a similar program for Mac which would turn it into a wireless router? Or is there something I don't see with Mac OS X's builtin features?

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• A possible case of hacked email account. What kind of an attack is this?

  - by Rickesh John

  I own a Yahoo mail account. I am using this account for sending resumes and receive notifications from various job portals. But yesterday, I found that some 10-15 mails had been sent to random addresses from my account. Most of them had this format: hr@<companyname>.com I am pretty sure that I didn't send any mails to such addresses. Initially, I thought the job portals may be sending mails on my behalf and Yahoo is logging them, but then I saw the contents. The contents of all those mails were a URL, which I did not click. SCARED. Also, to top it off, my "Sending Name" has been changed to 'Nice Maria'!! o_0 I have taken the necessary measures and changed my password and the secret question. I cannot delete this account as this email is registered with all the job portals and other companies. Is this a simple case of my account being compromised or was I a victim of some web vulnerability? All the mails seem to be bot generated, with only a URL as the message body. Please advice.

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• Can't resolve offline file conflicts

  - by Bryan

  We use roaming profiles on our Server 2008 R2 domain, with folder redirection for 'desktop', 'my documents' and 'application data'. But as our network is split across two sites, we have one file server at each site, which are configured to use domain based DFS namespaces and DFS replication to keep things in sync. The DFS path for the replication folder is as follows: \\domain\folderredirection$\<username>\<redirected-folder-name> The real paths are \\site-1-server\folderredirection$\<username>\<redirected-folder-name> and \\site-2-server\folderredirection$\<username>\<redirected-folder-name> As our users all switch between sites (sometimes several time per day), our folder redirection policy has to redirect to the DFS roots rather than hardcoded to a specific server. Both DFS and DFS-R have been proven to be working perfectly. On our laptops, we use offline files for the redirected folders, and this also works fine, however the problem is as follows: When conflicts occur in offline files, it is impossible to resolve the conflicts. I'm given the usual conflict resolution options (i.e. 'Ignore', 'Keep Both', 'Keep network' and 'Keep local'), however, not one of these options will resolve any conflict, yet no error is produced. We only use offline files on laptops, which have either Windows XP Professional or Windows 7 Professional installed. The problem is not specific to any one laptop, it affects every laptop and every conflicting file in exactly the same way. I would have thought the set up we have is common for companies that have multiple sites, so I'm hoping someone will have seen this before?

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• Postfix Whitelist before recipient restrictions

  - by GruffTech

  Alright. Some background. We have an anti-spam cluster trucking about 2-3 million emails per day, blocking somewhere in the range of 99% of spam email from our end users. The underlying SMTP server is Postfix 2.2.10. The "Frontline defense" before mail gets carted off to SpamAssassin/ClamAV/ ect ect, is attached below. ...basic config.... smtpd_recipient_restrictions = reject_unauth_destination, reject_rbl_client b.barracudacentral.org, reject_rbl_client cbl.abuseat.org, reject_rbl_client bl.mailspike.net, check_policy_service unix:postgrey/socket ...more basic config.... As you can see, standard RBL services from various companies, as well as a Postgrey service. The problem is, I have one client (out of thousands) who is very upset that we blocked an important email of theirs. It was sent through a russian freemailer who was currently blocked in two of our three RBL servers. I explained the situation to them, however they are insisting we do not block any of their emails. So i need a method of whitelisting ANY email that comes to domain.com, however i need it to take place before any of the recipient restrictions, they want no RBL or postgrey blocking at all. I've done a bit of research myself, http://www.howtoforge.com/how-to-whitelist-hosts-ip-addresses-in-postfix seemed to be a good guide at first, almost fixing my problem, But i want it to accept based on TO address, not originating server.

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• Public-to-Public IPSec tunnel: NAT confusion

  - by WuckaChucka

  I know this is possible -- and apparently fairly common with larger companies that don't/can't route private addresses for overlap reasons -- but I can't wrap my head around how to get this to work. I'm playing around with pfSense, Vyatta and a Cisco 5505 right now, hardware-wise. So here's my setup: WEST: Vyatta outside: 10.0.0.254/24 inside: 172.16.0.1/24 machine a: 172.16.0.200/24 EAST: Cisco 5505 outside: 10.0.0.210/24 inside: 192.168.10.1 machine b (webserver): 192.168.10.2 So what we're trying to do is this: route traffic across the tunnel from machine A to machine B without using private addresses. i.e. 172.16.0.200 makes a TCP request to 10.0.0.210:80, and as far as EAST is concerned, it sees a src IP of 10.0.0.254. On WEST, I have your typical many-to-one Source NAT to translate 172.16.0.0/24 to 10.0.0.254 and that's confirmed to be working. Also on WEST, I have the following IPSec config: Local IP: 10.0.0.254 Peer IP: 10.0.0.210 local subnet: 10.0.0.254/32 remote subnet: 10.0.0.210/32 I have the reversed configuration on EAST. What happens when I make a request from machine A to 10.0.0.210:80 is that the SNAT translates the private address of machine A to 10.0.0.254 and it's routed out (and discarded at the other end) without establishing the tunnel. What I'm assuming is happening is that the inside interface on WEST receives a packet from 172.16.0.200 and since this doesn't match the local subnet defined in the tunnel configuration, it's not processed by the IPSec engine and the tunnel is not established. How do you make this work? Seems like a chicken and egg thing with the NAT and IPSec and I just can't wrap my head around how this can be done: can I say, "if a packet is received on the inside interface with a destination of 10.0.0.210, translate it to 10.0.0.254 before the IPSec engine inspects it"?

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• best-practices to block social sites

  - by adopilot

  In our company we have around 100 workstation with internet access, And day by day situation getting more worst and worst from perspective of using internet access for the purpose of doing private jobs, and wasting time on social sites. Open hearted I am not for blocking sites like Facebook, Youtube, and others similar but day by day my colleagues do not finishing his tasks and while I looking at their monitor all time they are ruining IE or Mozilla and chat and things like that. In other way Ill like to block youtube sometime when We have very poor internet access speed, Here is my questions: Do other companies blocking social sites ? Do I need dedicated device for that like hardware firewall, super expensive router Or I can do that whit my existing FreeBSD 6.1 self made router with two lan cards and configured nat to act like router. I was trying do that using ipfw and routerfirewall but without success, My code looks like ipfw add 25 deny tcp from 192.168.0.0/20 to www.facebook.com ipfw add 25 deny udp from 192.168.0.0/20 to www.facebook. ipfw add 25 deny tcp from 192.168.0.0/20 to www.dernek. ipfw add 25 deny udp from 192.168.0.0/20 to www.dernek. ipfw add 25 deny tcp from 192.168.0.0/20 to www.youtube. ipfw add 25 deny udp from 192.168.0.0/20 to www.youtube.com

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• How use DNS server to create simple HA (High availability) of my website?

  - by marc22

  Welcome, How can i use DNS server to create simple HA (High availability) of website ? For example if my web-server ( for better understanding i use internal IP in real it will be other hosting companies) 192.168.0.120 :80 (is offline) traffic go to 192.168.0.130 :80 You have right, i use bad word "hight avability" of course i was thinking about failover. Using few IP in A records is good for simple load-balancing. But not in case, if i want notice user about failure (for example display page, Oops something is wrong without our server, we working on it) against "can't establish connection". I was thinking about setting up something like this 2 DNS servers, one installed on www server Both have low TTL on my domain, set up 2 ns records first for DNS with my apache server second to other dns If user try connect he will get ip of www server using first dns, if that dns is offline (probably www server is also down) so it will try second NS record, what will point to another dns, that dns will point to "backup" page. That's what i would like to do. If You have other idea please share. Reverse proxy is not option, because IP of server can change, or i can use other country for backup.

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• The best LCD monitors for reading text?

  - by Xeoncross

  I have been using an 19" Acer AL1916A B for several years now. While possibly failing in other areas - the text was incredibly sharp. Which is very important for someone like me that spends all day writing code. My eyes are very finely tuned and I can see refresh rates and even the smallest pixel overflows from anti-aliasing. Unfortunately it finally died. I then tried a 19" widescreen Acer X193w+ and found that the text was much less sharp. I also tried a 19" widescreen Samsung 920nw and was also disappointed. (by the way, widescreen is a great invention for companies - the same price for less screen!). I am looking for a couple of options of LCD's that hands-down render text ultra sharp and clear. This isn't subjective - an LCD either has sharp text or it doesn't. Anyone with delicate eyes can see the difference and knows what I'm talking about. Please also bare in mind that you're vision can adjust to a given screen; rendering your judgment biased if you do not constantly use other monitors also. If you use windows with ClearType enabled please do not reply.

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• Creating basic, redundant gigE or IB storage network for Xen?

  - by StaringSkyward

  With only a modest budget, I want to move my 4 xen servers over to network storage -either NFS or iSCSI which will be determined based on how well it performs when we test it (we need good throughput and it must continue to work through link and switch failure tests). We may add another couple of xen servers at some point when this is done. I don't know much about the design and operation of storage networks, so would really appreciate some hints from those with experience. The budget is around $3,800 excluding the storage appliance. I am currently thinking these are my options to remain on budget: 1) Go for used infiniband hardware and aim for 10gb performance. 2) Stick with gig ethernet and buy some new switches (cisco or procurve) to create a storage-only ethernet LAN. Upgrade to 10gigE later but try to use hardware capable of it where possible to reduce upgrade costs. I have seen used, warrantied infiniband switches at reasonable prices (presumably because big companies are converging on 10gbit ethernet?) and the promise of cheap 10gb is attractive. I know nothing about IB, so here come the questions: Can I buy 2 x switches and have multiple HBAs in my xen and storage nodes to get redundancy and increased performance without complexity or expensive management software costs? If so, can you point me to some examples? Do NFS and iSCSI work just the same regardless? Is IB a sensible choice or could/should I use ethernet or FC on the same budget - I'm keen not to get boxed into a corner for future upgrades, however. For the storage I am likely to build a storage server using nexentastor with the intention that I can later add more disks, SSDs and add another server to provide a failover option at the storage level. An HP LeftHand starter SAN is also under consideration, too. Thanks in advance.

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• Recommendations for colocation in the US

  - by Emil

  Hello serverfault I work for a European media company and we are currently looking for colocation in the US. I know the European market quite well unfortunately that is not the case for the US. I'm hoping for you guys to help me out a bit with a few questions, it would be much appreciated! I am looking for a data center that can deliver a high level of availability (tier 3 or better). The installation will be fairly large so capacity is important. Good internet connectivity/carrier presence. However most important is good customer support, skilled dedicated and responsive technical staff, since we won't have tech staff close by. I'm looking for a small and fast moving company that target internet businesses rather than big old enterprise hosting. What locations should we go for given that we want to reach all of the US from a single site and still maintain decent latency? (do we need east and west coast?) Where are the main internet hubs and should you try and get as close as possible? Are there any good online resources I should look at? Where do the large scale internet/media services colocate? Lastly I would be very happy to get some actual recommendations for companies to talk to P.S I'm happy to return the favor if anyone has question regarding data centers and colocation in Europe.

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• Attempting to bootstrap and getting weird errors

  - by miah

  I'm on a new computer(mac 10.9.2) and I am attempting to bootstrap my companies project, but setuptools is failing. I can run python bootstrap.py, which creates the ./bin/buildout, but when I run the buildout, it returns the following error: Traceback (most recent call last): File "./bin/buildout", line 17, in <module> import zc.buildout.buildout File "/Users/miah/Documents/realmassive/joson/eggs/zc.buildout-1.7.1-py2.7. egg/zc/buildout/buildout.py", line 40, in <module> import zc.buildout.download File "/Users/miah/Documents/realmassive/joson/eggs/zc.buildout-1.7.1-py2.7. egg/zc/buildout/download.py", line 20, in <module> from zc.buildout.easy_install import realpath File "/Users/miah/Documents/realmassive/joson/eggs/zc.buildout-1.7.1-py2.7. egg/zc/buildout/easy_install.py", line 29, in <module> import setuptools.archive_util File "build/bdist.macosx-10.9-intel/egg/setuptools/archive_util.py", line 15, in <module> ImportError: cannot import name ContextualZipFile I've attempted installing it via https://pypi.python.org/pypi/setuptools#unix-including-mac-os-x-curl and homebrew.

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• Running multiple sites on a LAMP with secure isolation

  - by David C.

  Hi everybody, I have been administering a few LAMP servers with 2-5 sites on each of them. These are basically owned by the same user/client so there are no security issues except from attacks through vulnerable deamons or scripts. I am builing my own server and would like to start hosting multiple sites. My first concern is... ISOLATION. How can I avoid that a c99 script could deface all the virtual hosts? Also, should I prevent that c99 to be able to write/read the other sites' directories? (It is easy to "cat" a config.php from another site and then get into the mysql database) My server is a VPS with 512M burstable to 1G. Among the free hosting managers, is there any small one which works for my VPS? (which maybe is compatible with the security approach I would like to have) Currently I am not planning to host over 10 sites but I would not accept that a client/hacker could navigate into unwanted directories or, worse, run malicious scripts. FTP management would be fine. I don't want to complicate things with SSH isolation. What is the best practice in this case? Basically, what do hosting companies do to sleep well? :) Thanks very much! David

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• Shared firewall or multiple client specific firewalls?

  - by Tauren

  I'm trying to determine if I can use a single firewall for my entire network, including customer servers, or if each customer should have their own firewall. I've found that many hosting companies require each client with a cluster of servers to have their own firewall. If you need a web node and a database node, you also have to get a firewall, and pay another monthly fee for it. I have colo space with several KVM virtualization servers hosting VPS services to many different customers. Each KVM host is running a software iptables firewall that only allows specific ports to be accessed on each VPS. I can control which ports any given VPS has open, allowing a web VPS to be accessed from anywhere on ports 80 and 443, but blocking a database VPS completely to the outside and only allowing a certain other VPS to access it. The configuration works well for my current needs. Note that there is not a hardware firewall protecting the virtualization hosts in place at this time. However, the KVM hosts only have port 22 open, are running nothing except KVM and SSH, and even port 22 cannot be accessed except for inside the netblock. I'm looking at possibly rethinking my network now that I have a client who needs to transition from a single VPS onto two dedicated servers (one web and one DB). A different customer already has a single dedicated server that is not behind any firewall except iptables running on the system. Should I require that each dedicated server customer have their own dedicated firewall? Or can I utilize a single network-wide firewall for multiple customer clusters? I'm familiar with iptables, and am currently thinking I'll use it for any firewalls/routers that I need. But I don't necessarily want to use up 1U of space in my rack for each firewall, nor the power consumption each firewall server will take. So I'm considering a hardware firewall. Any suggestions on what is a good approach?

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• redirect landing without changing url

  - by Gerard

  I'm working with Apache and Joomla. I would like to have some URIs that land to the same landing page, but avoiding the URL changes. So, for example: examplecom/luggage/delay/iberia examplecom/luggage/delay/aireuropa examplecom/luggage/delay/ryanair Need to point to examplecom/luggage/delay but the address bar must show the different airline companies. I've been messing arround with mod_rewrite with the following codes: 1: RewriteCond %{REQUEST_URI} /equipaje/problemas-de-equipaje/perdida-equipaje-iberia [NC,OR] RewriteCond %{REQUEST_URI} /equipaje/problemas-de-equipaje/perdida-equipaje-vueling [NC,OR] RewriteCond %{REQUEST_URI} /equipaje/problemas-de-equipaje/perdida-equipaje-ryanair [NC,OR] RewriteCond %{REQUEST_URI} /equipaje/problemas-de-equipaje/perdida-equipaje-aireuropa [NC,OR] RewriteRule ^(.*)$ /equipaje/problemas-de-equipaje/perdida-equipaje [P] 2: RewriteRule ^equipaje/problemas-de-equipaje/perdida-equipaje-iberia equipaje/problemas-de-equipaje/perdida-equipaje [NC,L] RewriteRule ^equipaje/problemas-de-equipaje/perdida-equipaje-vueling equipaje/problemas-de-equipaje/perdida-equipaje [NC,L] RewriteRule ^equipaje/problemas-de-equipaje/perdida-equipaje-ryanair equipaje/problemas-de-equipaje/perdida-equipaje [NC,L] RewriteRule ^equipaje/problemas-de-equipaje/perdida-equipaje-aireuropa equipaje/problemas-de-equipaje/perdida-equipaje [NC,L] The idea is to have different urls for AdWords but then I'll avoid the indexing of that company landpages to avoid replicated content. I've been searching for several examples and trying to understand how the module works, but until now I haven't acomplished with that... Is it possible to do that with mod_rewrite? Many thanks!

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• Using 1and1.com Servers, SMTP Mail is Limited - Local XAMPP Server Works As Expected

  - by nicorellius

  I'm starting to not like 1and1.com that much. I've used them for years, but mainly for simple sites without much need for configuration. I know there are better hosting companies out and I may go seeking them. The problem here is that on my Local XAMPP server (sitting on a network with Comcast ISP), I have a PHP script that uses PEAR::Mail to send mail using MIME. The script works find locally with either smtp.1and1.com and corresponding credentials and smtp.gmail.com with corresponding credentials, using appropriate ports, etc. 1and1 tells me that I have to change the MX record on the domain where this script runs in order to make this work. This doesn't make sense to me. Now I'm pretty new to all this, but how is it that this is the case? Why can my local server work just fine, out of the box, but their servers not? I have asked them these questions, but they are very vague and I cannot get any good answers from them. Versions: PEAR Version: 1.5.0 PHP Version: 4.4.9 Zend Engine Version: 1.3.0 My apologies in advance for my ignorance. Thanks for the help in advance.

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• Access keystore on Sun ONE Webserver 6.1 for 2048 bit key length SSL

  - by George Bailey

  We want to get 2048 bit key length CSR requests. The browser based GUI provides us with a 1024 bit CSR and I don't know how to change that. It seems that 1024 bit key lengths will no longer supported by SSL companies. (Lower cost options only support 2048 bit. Thawte who is much more expensive say they accept 1024 for only one or two year certificates, but not 3). The legacy systems in question are running Sun ONE Webserver 6.1. Upgrading would be time consuming and we would rather not have to do that right now. We will be phasing these out but it will take awhile, so... Got it!! http://middlewarekb.wordpress.com/2010/06/30/how-to-generate-2048-bit-keypair-using-sun-one-or-iplanet-6-1-servers/ It is for the same version webserver I am using. /opt/SUNWwbsvr/bin/https/admin/bin/certutil -R -s "CN=sub.domain.ext,OU=org unit,O=company name,L=city,ST=spelled state,C=US,E=email" -a -k rsa -g 2048 -v 12 -d /opt/SUNWwbsvr/alias -P https-sub.domain.ext-hostname- -Z SHA1 Previous efforts edited out.

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• Is there the equivalent of cloud computing for modems?

  - by morpheous

  I asked this question on SF, and someone recommended that I ask it here - (I don't think I have enough points to move a question from SF to SO - and in any case, I don't know how to do it - so here is the question again): I am interested in the concept of PAAS (platform as a service). However, all talk about SAAS/PAAS seems to focus on only the computer itself - not its peripherals. Is it possible to 'outsource' modems as a resource - so that an app running remotely can pump data to a modem in the cloud? As a bit of background to the question, a group of us are thinking of starting a company that offers similar services to companies like twilio etc - but I want to 'outsource' both the computing hardware (thats PAAS - the easy bit) and the modems (thats what I cant seem to find any info on). Does anyone know if modems can be bundled as part of a PAAS service? - alternatively, is there a way that an application running on one computer can communicate (i.e. pump data) to a remote modem residing on another machine?. I assume I can come up with some protocol over UDP or TCP - but there is no point reinventing the wheel - if such a protocol like that already exists (or if it some open source software allows one to do this). Any suggestions on how to solve this problem?

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• Looking for a recommendation on measuring a high availability app that is using a CDN.

  - by T Reddy

  I work for a Fortune 500 company that struggles with accurately measuring performance and availability for high availability applications (i.e., apps that are up 99.5% with 5 seconds page to page navigation). We factor in both scheduled and unscheduled downtime to determine this availability number. However, we recently added a CDN into the mix, which kind of complicates our metrics a bit. The CDN now handles about 75% of our traffic, while sending the remainder to our own servers. We attempt to measure what we call a "true user experience" (i.e., our testing scripts emulate a typical user clicking through the application.) These monitoring scripts sit outside of our network, which means we're hitting the CDN about 75% of the time. Management has decided that we take the worst case scenario to measure availability. So if our origin servers are having problems, but yet the CDN is serving content just fine, we still take a hit on availability. The same is true the other way around. My thought is that as long as the "user experience" is successful, we should not unnecessarily punish ourselves. After all, a CDN is there to improve performance and availability! I'm just wondering if anyone has any knowledge of how other Fortune 500 companies calculate their availability numbers? I look at apple.com, for instance, of a storefront that uses a CDN that never seems to be down (unless there is about to be a major product announcement.) It would be great to have some hard, factual data because I don't believe that we need to unnecessarily hurt ourselves on these metrics. We are making business decisions based on these numbers. I can say, however, given that these metrics are visible to management, issues get addressed and resolved pretty fast (read: we cut through the red-tape pretty quick.) Unfortunately, as a developer, I don't want management to think that the application is up or down because some external factor (i.e., CDN) is influencing the numbers. Thoughts? (I mistakenly posted this question on StackOverflow, sorry in advance for the cross-post)

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• I receive email not addressed to me - virus?

  - by Anne

  Every once in a while I receive email (on Gmail) that isn't addressed to me. Gmail puts it in the spam box, because it 'can't verify that it has been sent by [sender]'. The emails, when opened, contain confidential information about deliveries and paid bills (it does look an awful lot like 'real' mail from well-known companies, and it doesn't look like a scam, since the mail is informative - they give information instead of asking for credit card numbers ;-)), and I even got an email from "Facebook" that I requested a password change and that I have to 'click here' to change the password for [email address that isn't mine]. I am not the only addressee, there seems to be a whole list of Gmail addresses beginning with 'a'. The original addressee obviously has some sort of virus, and now I wonder if this could be a risk for me too. Is my email being sent around without my knowing too? I am not the kind of person who randomly clicks on shady links - I am very careful on the internet - but maybe there are other ways of catching viruses? Is there something I should do/check? Thank you for your help!

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• Membership in two domains

  - by imagodei

  Hello! I would your suggestions for an effective solution for a person, who needs to access resources in two Windows domains and wants to use one computer. It's about our CEO, who has accepted a second position in another company. Accessing files and folders isn't big problem. The greatest challenge I see is that he wants to conveniently access Exchange accounts in both companies; he would like to send and receive mail in single Outlook if possible (two profiles?) There is also a challenge with calendars: he would like to have one calendar for all activities from both Exchange accounts. Creating a POP3 account for accessing second Exchange server is a last resort, because obviously there is a problem with scheduling meetings and other calendar related tasks. Forwarding and receiving all mail/tasks on primary Exchange server is inconvenient because simple replying to original sender is disabled; and also when manually changing the recepient, he will receive mail from the wrong address. We were considering Virtualisation, that is setting up an instance of virtual machine inside existing installation and then joining this virtual computer to a second domain. Then installing another MS Outlook. This would of course mean two different Outlook accounts, two different calendars, but would at least enable our CEO to access all information from a single laptop. Does anyone have any other idea? I know setting up two domains on a single computer is a no-go (without much hacking at least), but effective workarounds are appreciate. The thing I am looking here is high usage/efficiency/productivity, but also as elegant solution from the administration point of view. Thank you very much (if you managed to read this through, this is a good sign ^_^ )

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• Sonicwall NSA 240, Configured for LAN and DMZ, X0 and X2 on same switch - ping issues

  - by Klaptrap

  Our Sonicwall vendor supplied and networked the NSA240 when we required a DMZ in our infrastructure. This was configured and appeared correct although VPN users periodically dropped DNS and Terminal Services. The vendor could not resolve and so the call was escalated to Sonicwall. The Sonicwall support engineer took a look and concluded that the X0 (LAN) and X2 (DMZ) intefaces were cabled to the same switch and so this is the issue. What he observed is a ping request to the LAN Domain Controller, from a connected VPN user, is forwarded (x0) from the VPN client IP to the DC IP but the ping response from the DC IP to the VPN client IP is on X2, a copy of the log is detailed below:- 02/02/2011 10:47:49.272 X1*(hc) X0 192.168.1.245 192.168.1.8 IP ICMP -- FORWARDED 02/02/2011 10:47:49.272 -- X0* 192.168.1.245 192.168.1.8 IP ICMP -- FORWARDED 02/02/2011 10:47:49.272 X2*(i) -- 192.168.1.8 192.168.1.245 IP ICMP -- Received X0 - LAN X1 - WAN X2 - DMZ The Sonicwall engineer concluded that we either need a seperate switch for X2 or we use a VLAN switch for both. I am the companies software engineer and we have yet to have heard back from the vendor, so I am lost at sea at the moment. Do we need to buy this additional equipment or is there another configuration on the NSA240 we can use?

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