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• Share Point ACL on OSX Lion Server - Posix group always takes over ACLs

  - by Ben

  Trying to configure a share point on a Lion Server machine. The directory is created by the local server admin (serveradmin) and has rwxr-x--- given to it. The serveradmin user belongs to the local staff group so serveradmin readwrite staff group read Others none We have an OD group for all the employees (Workers) . Using the Server tool we've given Full Control to the share point: Workers Full Control serveradmin readwrite staff group read Others none We would assume that Workers could then do what they want on the share but that doesn't seem to be the case. It appears the POSIX permissions take over the ACL permissions for Worker. If I change the staff permission to readwrite then the Workers can create a file or folder in the share point. I would think the ACL should take over but it doesn't, posix always win, rendering ACL useless. Furthermore if I leave the readwrite permission for staff and take Write permission away for the Workers group then the posix group still wins. Essentially the Workers ACL does absolutely nothing. There are reports of similar problems in this Apple forum thread: https://discussions.apple.com/thread/3722901 The directory nesting fix suggested there doesn't work for us. Has anyone had similar issues and know how to fix this? Edit: in Workgroup Manager the employees user are set to primary group staff and given the additional OD group Workers. Changing their primary group doesn't help, it only shifts the problem onto Others taking over rights (logically) Edit 2: Ok, this is interesting, adding OD Users to the share's ACL works totally fine

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• Server Restart's and Respective Orders

  - by TheD

  EDIT:Not meaning to be disrespectful to any of the answers, but, the main question was whether rebooting a DC at the beginning of a cycle, then all the other servers, or rebooting it at the end once all the others are back online - is there a reason for doing it either way? I'm still not sure based on current responses. This will most likely seem like a fairly, maybe even stupid, question, but it's something I have been wondering about. As part of a regular process for clients servers are restarted remotely after patches and every client tends to have a similar order - but there always seems to be a small debate when it comes down to when do you reboot your DC. For example, 4 servers, 1 DC, 1xExchange, 1xBESX and 1xRandom, lets say it has some CRM software installed, is it best to reboot the DC first, then Exchange, then BESX and so on - or reboot all the servers, then reboot the DC last? - Perhaps it doesn't matter at all and it's just a case of how you have always done it. Would it change in a Hyper-V environment for example, with a physical DC, 1 VHost with all your servers virtualised on that Host? Rebooting the VHost and Virtual Machines first, then the DC at the end, or vice versa? Thanks!

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• Cannot send email outside of network using Postfix

  - by infmz

  I've set up an Ubuntu server with Request Tracker following this guide (the section about inbound mail would be relevant). However, while I'm able to send mail to other users within the network/domain, I cannot seem to reach beyond - such as my personal accounts etc. Now I have no idea what is causing this, I thought that all it takes is for the system to fetch mail through our exchange server and be able to deliver in the same way. However, that hasn't been the case. I have found another server setup in a similar fashion (CentOS 5, Request Tracker but using Sendmail), however it is a dated server and whoever's built it has kindly left no documentation on how it works, making it a pain to use that as a reference system! :) At one point, I was told I need to set up a relay between the local server's email add and our AD server but this didn't seem to work. Sorry, I know next to nothing about mailservers, my colleagues nothing about Linux so it's a hard one for me. Thank you! EDIT: Result of postconf -N with details masked =) alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no config_directory = /etc/postfix inet_interfaces = all mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 mydestination = myhost.mydomain.com, localhost.mydomain.com, , localhost myhostname = myhost.mydomain.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname readme_directory = no recipient_delimiter = + relayhost = EXCHANGE IP smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes Sample log message: Sep 4 12:32:05 theedgesupport postfix/smtp[9152]: 2147B200B99: to=<[email protected]>, relay= RELAY IP :25, delay=0.1, delays=0.05/0/0/0.04, dsn=5.7.1, status=bounced (host HOST IP said: 550 5.7.1 Unable to relay for [email protected] (in reply to RCPT TO command))

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• Can't do more than one activity at a time after switching modems

  - by vallorn

  I had to replace the Motorola 2210 DSL modem that I got when I signed up for AT&T DSL Direct a few years ago. The modem kept randomly restarting and it eventually gave out on me. I am assuming overheating was the cause here because it was almost too hot to touch. In any case, I replaced it with a Netgear DM111PSP. It works fine but I can't do more than one activity at a time with it. If my wife is watching Netflix, there is a noticeable delay/latency when trying to view web sites. It's even worse if I try to play an on-line game while she's streaming; the game is basically unplayable. The odd thing is, the only other activity I can do while she's streaming is stream another Netflix show myself. There is no delay when doing that, no buffering either. I'm not a networking guy so maybe there is an explanation for it but I find that kind of odd. I've tried using QoS through my Buffalo N600 wireless router and it doesn't seem to help. With the old Motorola modem, she could be watching Netflix while I play a game and everything worked just fine. Is there anything I can check or reconfigure possibly on the modem that would account for this? Should I just ditch the Netgear and get another modem instead? I have the Netgear modem connected to the Buffalo router in a bridged mode. Its the same exact setup as I had with the Motorola and as far as I can tell, it's not the router that is the cause.

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• Need help setting up OpenLDAP on OSX Mountain Lion

  - by rjcarr

  I'm trying to get OpenLDAP manually configured on OSX Mountain Lion. I'd prefer to do it manually instead of installing OSX server, but if that's the only option (i.e., OpenLDAP on OSX isn't meant to be used without server) then I'll just install it. I've seen guides that mostly just say to change the password in slapd.conf and then start the server and it should work. However, whenever I try to do anything with the client it tells me this: ldap_bind: Invalid credentials (49) I've tried encrypting the password as well as leaving it plain it doesn't seem to matter. The version is 2.4.28 and I've read as of 2.4 OpenLDAP uses slapd.d directories, but that doesn't seem to be the case in OSX. There was mention of an 'olcRootPW' I should use (instead of 'rootpw' in slapd.conf), but I only found that in a file named slapd.ldif. Anyway, I tried setting a password in there but it didn't make a difference). So ... I'm really confused. Has anyone got OpenLDAP working on OSX Moutain Lion without the server tools?

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• LDAP Authentication woes

  - by Marcelo de Moraes Serpa

  Hello list, I have a local OpenLDAP server with a couple of users. I'm using it for development purposes, here's the ldif: #Top level - the organization dn: dc=site, dc=com dc: site description: My Organization objectClass: dcObject objectClass: organization o: Organization #Top level - manager dn: cn=Manager, dc=site, dc=com objectClass: organizationalRole cn: Manager #Second level - organizational units dn: ou=people, dc=site, dc=com ou: people description: All people in the organization objectClass: organizationalunit dn: ou=groups, dc=site, dc=com ou: groups description: All groups in the organization objectClass: organizationalunit #Third level - people dn: uid=celoserpa, ou=people, dc=site, dc=com objectclass: pilotPerson objectclass: uidObject uid: celoserpa cn: Marcelo de Moraes Serpa sn: de Moraes Serpa userPassword: secret_12345 mail: [email protected] So far, so good. I can bind with "cn=Manager,dc=site,dc=com" and the 12345678 password (the local server password, setup on slapd.conf). However, I would like to bind with any user in under the people OU. In this case, I'd like to bind with: dn: uid=celoserpa, ou=people, dc=site, dc=com userPassword: secret_12345 But I'm getting a "(49) - Invalid Credentials" error everytime. I have tried through CLI tools (such as ldapadd, ldapwhoami, etc) and also ruby/ldap. The bind with these credentials fails with a invalid credentials error. I thought that it could be an ACL issue, however, the ACLs on slapd.conf seem to be right: access to attrs=userPassword by self write by dn.sub="ou=people,dc=site,dc=com" read by anonymous auth access to * by * read I was suspecting that maybe OpenLDAP doesn't compare against userPassword? Or maybe some ACL configuration I am missing that is somehow affecting the read access to userPassword for the specific DN. I'm really lost here, any suggestion appreciated! Cheers, Marcelo.

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• Running Windows Update inside Windowx XP Mode

  - by Noam Gal

  I am working on a Win 7 Ultimate machine, and was using XP for some development tasks (for compatibility checks). Everything worked like a charm on the XP, including updates. Two days ago I had to switch computer (mainly a new motherboard/cpu), and I had just stuck my old HD inside the newer case. Win 7 worked like a charm - installed all the new drivers, identified everything automatically, no sweat. The trouble started when I tried running my old XP mode - it won't launch, complaining about the cpu change. I figured it's not a big deal, and I deleted the VM, and re-ran XP mode. It told me it can't find it, and offered to create a new one, just what I wanted. I had finished setting up the new XP mode VM, and it seems to work just fine. Got it to use the host network adapter, so I can surf from "inside". But I can't get Windows Update to run. Whenever I click on the "Custom" button on the WU site, after a short while, I get the [Error number: 0x80072EFD] page. I tried several solution from around the web for it (clearing some cache and restarting the wuauserv, even a microsoft fix-it run), but still nothing seems to work. Anyone here has any new tip for me? Thanks.

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• Mapped networkdrive on logout

  - by Robuust

  I'm using a script to keep a mapped networkconnection alive, but ofcourse the mapped connection is gone when I logout. The point is now, that I'm running this on Windows Server 2008 R2, where I use remote desktop to login on the administrator account. However, it should remain logged in and not remove the mapped connection as this script takes care of not logging out on MS office 365 sharepoint. Is there a way to keep the mapped networklocation (L:) available after logout? So the script can run to remain the connection? # Create an IE Object and navigate to my SharePoint Site $ie = New-Object -ComObject InternetExplorer.Application $ie.navigate('https://xxx.sharepoint.com/') # Don't need the object anymore, so let's close it to free up some memory $ie.Quit() # Just in case there was a problem with the web client service # I am going to stop and start it, you could potentially remove this # part if you want. I like it just because it takes out a step of # troubleshooting if I'm having problems. Stop-Service WebClient Start-Service WebClient # We are going to set the $Drive variable here, this is just # going to tell the command what drive letter to map you can # change this to whatever you want (if you change it to a # drive that is already mapped it will overwrite it, so be careful. $Drive = "L:" # You can change the drive destiniation to whatever you want, # it has to be a document library or folder of course. $DrvDest = "https://xxx.sharepoint.com/files/" # Here is where we create the object to map the network drive and # then map the network drive $net = New-Object -ComObject WScript.Network; $net.mapnetworkdrive($Drive,$DrvDest) # That is the end of the script, now schedule this with task # scheduler and every so often and you should be set.

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• scp No such file or directory

  - by Joe

  I've a confusing question for which superuser doesn't seem to have a good answer, and neither google. I'm trying to scp a file from a remote server to my local machine. The command is this scp user@server:/path/to/source/file.gz /path/to/destination The error I get is: scp: /path/to/source/file.gz: No such file or directory user is my username on the server. The command syntax appears fine to me. ssh works fine and I can cd to the file and it doesn't seem to be an access control issue? Thanks; Edit: Thank you John. I spotted the issue. ls returned this: -r--r--r-- 1 nobody users 168967171 Mar 10 2009 /path/to/source/file.gz So, the file was on a read-only file system and user is able to read it but not scp. I just copied the file to a different directory and chown it and worked fine. It would be good if someone can explain why this is the case though.

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• Networking problems in VMWare with wireless bridge

  - by Robert Koritnik

  Barebone data: virtualization: VMWare Workstation 6.5 (latest) Host: Windows Server 2008 x64 Guest: Windows Server 2008 x86 Host network adapter: Ethernet (see comment) Host network adapter: Wireless (see comment) Guest ethernet network adapter 1: Bridged VMNet (automatic) Guest ethernet network adapter 2: Host only VMNet comment: my host has LAN and Wifi but only one at the same time. I'm either wired or wireless. Never both. So bridged connection on VM goes either via wire or air. Problem When I'm wirelessly connected on the host and I access internet within VM my connection just gets stalled (not dropped). It doesn't experience any timeout whatsoever, it just stops downloading/communicating. For instance: I start downloading a file with a browser (IE/FF/CR doesn't matter) and I have to pause/restart download when speed drops to 0. I could wait indefinitely but connection won't pick-up automatically. What did I miss in my network configuration? Update 1 I've tested this in various combinations. This works fine when host is connected via Ethernet. But when host is connected via Wifi, the connection on the guest works as previously described. It connects fine. It gets a valid IP from DHCP... Everything is cool as long as you don't start doing some intensive network traffic (ie. download a 2MB file) In this case it starts downloading and stops after a while. Speed just drops to 0B/s... Sometimes it picks up back, sometimes it doesn't. Connection still stays and works. I can ping around with no problem.

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• Defeating the RAID5 write hole with ZFS (but not RAID-Z) [closed]

  - by Michael Shick

  I'm setting up a long-term storage system for keeping personal backups and archives. I plan to have RAID5 starting with a relatively small array and adding devices over time to expand storage. I may also want to convert to RAID6 down the road when the array gets large. Linux md is a perfect fit for this use case since it allows both of the changes I want on a live array and performance isn't at all important. Low cost is also great. Now, I also want to defend against file corruption, so it looked like a RAID-Z1 would be a good fit, but evidently I would only be able to add additional RAID5 (RAID-Z1) sets at a time rather than individual drives. I want to be able to add drives one at a time, and I don't want to have to give up another device for parity with every expansion. So at this point, it looks like I'll be using a plain ZFS filesystem on top of an md RAID5 array. That brings me to my primary question: Will ZFS be able to correct or at least detect corruption resulting from the RAID5 write hole? Additionally, any other caveats or advice for such a set up is welcome. I'll probably be using Debian, but I'll definitely be using Linux since I'm familiar with it, so that means only as new a version of ZFS as is available for Linux (via ZFS-FUSE or so).

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• How can I avoid an error in this .htaccess file?

  - by mipadi

  I have a blog. The blog is stored under the /blog/ prefix on my website. It has the usual URLs for a blog, so articles have URLs in the format /blog/:year/:month/:day/:title/. First and foremost, I want to automatically redirect visitors to the www subdomain (in case they leave that off), and internally rewrite the root URL to /blog/, so that the front page of the blog appears on the front page of the site. I have accomplished that with the following set of rewrite rules in my .htaccess file: RewriteEngine On # Rewrite monkey-robot.com to www.monkey-robot.com RewriteCond %{HTTP_HOST} ^monkey-robot\.com$ RewriteRule ^(.*)$ http://www.monkey-robot.com/$1 [R=301,L] RewriteRule ^$ /blog/ [L] RewriteRule ^feeds/blog/?$ /feeds/blog/atom.xml [L] That works fine. The problem is that the front page of the blog now appears at two distinct URLs: / and /blog/. So I'd like to redirect the /blog/ URL to the root URL. Initially I tried to accomplish this with the following set of rewrite rules: RewriteEngine On # Rewrite monkey-robot.com to www.monkey-robot.com RewriteCond %{HTTP_HOST} ^monkey-robot\.com$ RewriteRule ^(.*)$ http://www.monkey-robot.com/$1 [R=301,L] RewriteRule ^$ /blog/ [L] RewriteRule ^blog/?$ / [R,L] RewriteRule ^feeds/blog/?$ /feeds/blog/atom.xml [L] But that gave me an infinite redirect (maybe because of the preceding rule?). So then I tried this set: RewriteEngine On # Rewrite monkey-robot.com to www.monkey-robot.com RewriteCond %{HTTP_HOST} ^monkey-robot\.com$ RewriteRule ^(.*)$ http://www.monkey-robot.com/$1 [R=301,L] RewriteRule ^$ /blog/ [L] RewriteRule ^blog/?$ http://www.monkey-robot.com/ [R,L] RewriteRule ^feeds/blog/?$ /feeds/blog/atom.xml [L] But I got a 500 Internal Server Error with the following log message: Invalid command '[R,L]', perhaps misspelled or defined by a module not included in the server configuration What gives? I don't think [R,L] is a syntax error.

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• Tell Tomcat to drop requests instead of dying "All threads (150) are currently busy"

  - by Nicolas Raoul

  My Tomcat 6.0.26 sometimes dies saying: SEVERE: All threads (150) are currently busy, waiting. Increase maxThreads (150) or check the servlet status ... then Tomcat shuts down, and users can't access the webapp until I restart Tomcat manually. Some of the threads indeed take a long time to execute, it is by-design, not a thread-gone-wild problem. I know I could increase maxThreads, but that is not a viable solution, because the server might receive requests even more requests. QUESTION: Instead of dying, can I tell Tomcat to just drop requests when maxThreads is reached and the AJP/1.3 backlog is full? Below is my server.xml in any case: <?xml version='1.0' encoding='utf-8'?> <Server port="8005" shutdown="SHUTDOWN"> <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" /> <Listener className="org.apache.catalina.core.JasperListener" /> <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" /> <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" /> <GlobalNamingResources> <Resource name="UserDatabase" auth="Container" type="org.apache.catalina.UserDatabase" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" pathname="conf/tomcat-users.xml" /> </GlobalNamingResources> <Service name="Catalina"> <Executor name="tomcatThreadPool" namePrefix="catalina-exec-" minSpareThreads="100"/> <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" /> <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" enableLookups="false" useBodyEncodingForURI="true" backlog="150" maxThreads="150" executor="tomcatThreadPool" keepAliveTimeout="5000" connectionTimeout="300000" /> <Engine name="Catalina" defaultHost="localhost" jvmRoute="ecm1"> <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/> <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> </Host> </Engine> </Service> </Server>

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• Internal and External DNS from Different Servers, Same Zone

  - by Shane

  Hello All, I am either having trouble understanding how DNS works, or I am having trouble configuring my DNS correctly (either one isn't good). I am currently working with a domain, I'll call it webdomain.com, and I need to allow all of our internal users to get out to dotster to get our public DNS entries just like the rest of the world. Then, on top of that, I want to be able to supply just a few override DNS entries for testing servers and equipment that is not available publically. As an example: public.webdomain.com - should get this from dotster outside.webdomain.com - should get this from dotster as well testing.webdomain.com - should get this from my internal dns controller The problem that I seem to be running into at every turn is that if I have an internal DNS controller that contains a zone for webdomain.com then I can get my specified internal entries but never get anything from the public DNS server. This holds true regardless of the type of DNS server I use also--I have tried both a Linux Bind9 and a Windows 2008 Domain Controller. I guess my big question is: am I being unreasonable to think that a system should be able to check my specified internal DNS and in the case where a requested entry doesn't exist it should fail over to the specified public dns server -OR- is this just not the way DNS works and I am lost in the sauce? It seems like it should be as simple as telling my internal DNS server to forward any requests that it can't fulfill to dotster, but that doesn't seem to work. Could this be a firewall issue? Thanks in advance

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• Error loading operating system: format Windows 7 to Windows XP Service Pack 3

  - by Blerta

  I saw that there are other questions like mine here. But O also saw that some problems where solved with fixmbr from a Windows 7 recovery console, but that didn't work for me. I bought my laptop with Vista installed and later reformated and used Windows 7. During formatting with Windows 7 I had some problems with my hard drive and found out it was dead so I bought a new one. I wanted to reformat with Windows XP,because Windows 7 is consuming more RAM that it is able handle and I wanted to use it for other programs. So I formatted with Windows XP Service Pack 3 but after first reboot a message appeared: "Error loading operating system" Reading here, I assumed that maybe I had installed it on the wrong partition and maybe having two OS now, so I used fixmbr but it is still not starting up. Anyway I am sure that is not the case of two operating systems. Is there any chance that when the computer designed to work with Vista you would face problems with Windows XP? Like not recognizing a hard drive?

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• Maxtor 500GB external hard drive not being detected but power is going to it?

  - by ClarkeyBoy

  I have 2 * Maxtor Onetouch 4 Lite 500GB external hard drives (part no. 9NT2A4-500). They both used to work fine on my old laptop (an Acer) but I have not used them for about a year, since my laptop was stolen and I got this one (also an Acer [Aspire 7738G]). I have one plugged into the mains with one of the leads I believe was supplied with them. It appears to be receiving power as it is warm and the power light (on the unit itself) is on; also the mains adapter is fairly warm. I also have it plugged into my laptop with a USB lead which I have tested on my mp3 player (so I know it works). However my hard drive is not showing on my computer. I have tried checking for new hardware, installing the software that was supplied with it, checking drive letters in case it is registered as C: or something stupid, checking for problems etc... I can't find any cause for it to do this. It does appear to be starting up and, possibly, shutting down and restarting constantly (that's what it sounds like altho I can't be certain). I have had both hard drives stored in different places for the last year and they're both doing the same thing.. if it was only one then I'd guess it had got damaged or corrupted or something but since it is both I doubt this is it. The only things in common with both of them are the leads and the laptop, however I know the USB lead works and guess the mains lead works as there is power going to the unit. Has anyone come across this before or does anyone have any idea what the cause / solution to the problem is? Any help would be greatly appreciated. Regards, Richard

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• How do I find information about a particular trojan? "W32/Smalltroj.XVGT", as reported by Norman

  - by Lasse V. Karlsen

  I tried checking the Norman antivirus page, Virus-descriptions, but sadly it seems Norman has intentionally obfuscated their search results (I tried clicking on W, and it seems they just list viruses with a W somewhere in the description, instead of more typical, all viruses with a name starting with a W.) Is there a common virus-list somewhere, or is it as I suspect, every antivirus manufacturer is free to come up with their own identification tags for each virus? Several "vshost32.exe" files, related to Microsoft Visual Studio 2008, has been quarantined on our server today, probably related to a test-deployment of some internal software. Some developer machines that have grabbed that latest version of our program has also had the same files quarantined. Now, these files should not have been deployed in the first case, so I'll be looking into that, but whenever any developer now builds a program locally and attempts to debug, the same file is placed in the build output directory, and promptly quarantined. Does anyone have any clues as to how I can go about verifying this before I pointedly ask the antivirus software to go take a hike on this particular virus? Edit: I've copied one of the quarantined files manually to a machine over the network that doesn't have antivirus installed, and compared the file on that machine with a local copy (on that machine) of the vshost32.exe template file, and they're bit-for-bit identical. I guess this is a false positive. I still would like to know if it would be possible for me to verify this in any other way though, since next time such a trojan might be reported in a compiled file that we won't have a pristine copy of.

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• What speed are Wi-Fi management and control frames sent at?

  - by Bryce Thomas

  There are a bunch of different 802.11 Wi-Fi standards, e.g. 802.11a, 802.11b, 802.11g, 802.11n etc. that all support different speeds. Wi-Fi frames are generally categorised as one of the following: Data frames - carry the actual application data Control frames - coordinate when its safe to send/reduce collisions Management frames - handle connection discovery/setup/tear down (e.g. AP discovery, association, disassociation) My question is about whether all these frames, and specifically management frames, are transmitted at the fastest supported speed available, or whether certain classes of frames are transmitted at some lowest common denominator speed. I have noticed that when I put an 802.11b/g only device into monitor mode and capture traffic over the air, I still see management frames (e.g. association/disassociation) being transmitted between my phone and AP which are both 802.11n, even though 802.11n has a higher transfer rate. So I am imagining one of two possibilities: My 802.11n phone/AP had to negotiate a slower speed for some reason and that's why I can see their frames on my 802.11b/g monitoring device. Management frames (and perhaps control frames also?) are sent at a lower speed, and it's only data frames that are transmitted faster with newer 802.11 standards. The reason I would like to know which one of these two possibilities (or perhaps a third possibility) is the case is that I want to capture management frames, and need to know whether using an 802.11b/g card is going to lead to me missing some frames sent at higher speeds than the monitoring card can observe. If management frames are indeed sent at a slower rate, then it's all good. If I just happen to be seeing the management frames because my phone/AP have negotiated a slower rate though, then I need to reconsider what card I use for packet capture.

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• How do I know what hardware to buy to meet my needs?

  - by Darth Android

  While Stack Exchange does not permit shopping recommendations, it doesn't provide any general advice to consider when buying hardware. So, instead of just telling those that ask what to buy that it's not allowed, let's tell them how to figure out what they need. When looking forward to build a computer, how do I know what to buy? How do I find out if a given CPU will be enough for a certain game or application that I want to run? How do I find out if a given graphics card will be enough for a certain game or application? What is important when looking at motherboards? How much memory do I need? How do I know how much wattage I need for a power supply? What size case do I need? What relevant standards do I need to read up on and be aware of? PCI, PCIe, SATA, USB 2.0, USB 3.0, etc... What "gotchas" do I need to be on the lookout for? Please keep responses generation-agnostic to ensure they will be helpful to our future users. :)

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• PGB Multipath & return routes

  - by Dennis van der Stelt

  I'm probably a complete n00b concerning serverfault related questions, but our IT department makes a bold statement I wish to verify. I've searched the internet, but can find nothing related to my question, so I come here. We have Threat Management Gateway 2010 and we used to just route the request to IIS and it contained the ip address so we could see where it was coming from. But now they turned on "Requests apear to come the TMG server" so ip addresses aren't forwarded anymore. Every request has the ip of the TMG server. Now the idea behind this is that because of multipath bgp routes, the incoming request goes over RouteA, but the acknowledgement messages could return over RouteB. The claim is that because the request doesn't come from the first known source, our proxy, but instead from IIS, some smart routers at the visitor of our websites don't recognize the acknowledgement message and filter it out. In other words, the response never arrives. Again, this is the claim. But I cannot find ANY resources on the internet that support this claim. I do read about pgb multipath, but more in the case that there are alternative routes when the fastest route fails for some reason. So is the claim completely bogus or is there (some) truth to it? Can someone explain or point me to resources? Thanks in advance!

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• Java applet class never found

  - by Andrew

  I am having a problem with the java plugins of all three major browsers: chromium, firefox and Internet Explorer. The issue is that applets will always fail to load and yield errors no matter what website or what applet I am trying to use. I can not see any of the example applets on oracle's website; I can not launch the minecraft browser applet; nor can I launch any applet across the web using any browser. I always receive a "class not found:AppletClassHere.class" error. I know that my browser plugin must be working correctly because I can launch the Cisco Nac applet each time I connect to my network and I can launch my own simple applets offline. I am connecting to the internet through a vpn in case that is important. It also seems like a lot of other people I know are having this issue. Re-installing the plugin does not appear to fix the issue. I am asking this question to find out the cause of this problem, and any possible solutions. Thank you.

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• Datacenter IP Addressing and DNS Management

  - by user65248

  Hello everyone Basically we are setting up a small Datacenter, about 300 amps power and max 50 racks, Im saying these coz I wanna u imagine the size and requirements, I have studied networking mostly Microsoft and Windows based systems , but I cant get how the IP addressing and DNS management and configuration works in a Datacenter , and unfortunately I have to setup everything by myself but defe we will have some staff to do some job. Now my questions Datacenter IP Addressing Suppose we have got a block of 200 IP addresses from our ISP, How can I manage these block of IP addresses, is there any software out there to simplify this I heard that using DHCP server in a datacenter is not recommended, otherwise what would u say about MS DHCL server ofc considering we need to have backup serversin case of failur How can I assign a block of IPs to a specific rack, I know with different software and management its different but Im asking how it is done normally IP addresses are exposed to the whole network, what if a customer try to use an IP address and is not assigned to their server or rack , how can I prevent this or how can I track the IP usage DNS Management Im goin to setup at least two servers for our DNS servers, I know nothing about Datacenter DNS system, but I have configured DNS server in normal networks and also for webservers, Now I wanna know What exactly needs to be done for a DNS in a datacenter that is not done for normal networks. How can I configure PTR records why cant I configure PTR records on my webserver side DNS server and it should be done on datacenter DNS server , I mean what is the difference in DC DNS servers that allow us to to so , I know the question is very silly and simple but Im confused Is there any software outthere to allow doing the whole thing, I mean automatically add records to the DNS and also managin IP addresses !? Thanks in advance

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• How can I tell if a replacement display is compatible with my laptop?

  - by moraleida

  I have an Acer Aspire 4810TZ from 2010 which I truly love - it's a 3 year old notebook that still carries on for about 5 to 6h straight off the battery. I've also invested in it with an SSD and extra RAM and it's fine for my use right now. I'd really rather not just dump it. Now... its screen is dead and I'm looking for replacement parts, but it turns out to be a kind of expensive display - AUO B140XW02 14" LED. US$ 125 was the cheapest I found here (Rio de Janeiro, Brazil). The official dealer sells them for US$ 175. I'm aware of How do I know if a LCD is compatible with my Laptop? and Can I replace a laptop screen with one of a different resolution? but the answers don't really help me in this case. Also Replacing an LCD screen in a laptop gives me a hint but I'm completely dumb at hardware so this is why i'm asking: Is it possible to buy an LCD or a lower grade LED screen with the same connectors? What characteristics should I look for to find out if a certain display is compatible?

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• Why can't I install Java?

  - by Patrick

  I've been searching high and low for someone who can help me. I've been trying for a month. A month. to install Java on my new PC to no avail. No tech support forum can seem to help me. It all started while playing tekkit one day. I kept running out of memory (using the 32-bit JRE 7 u45) so I decided to install the 64-bit version. I uninstalled the 32-bit version first, for some reason, and downloaded the 64 bit runtime. In the installer, I go through all the normal screens until the installation progress bar appears. Then, it just sits there. No progress is made. No CPU is used by the installer, or any of its dependencies. The installer will stay like this for hours, days, and in one case a whole week without doing anything at all. I've tried installing older versions, the 32-bit version, even Java 6 and none of them will install. UAC is disabled, I've run regedit, CCleaner, and any other "fix-it" program there is. It's getting to the point where I may just have to wipe my hard drives and start over. I have several applications that require java, so this is an absolute necessity. Please, please, someone have the answer. Here are my system specs: -Intel i7-3770k -AsRock z77 Extreme3 -Samsung 840 pro SSD -WD Caviar Black 1tb

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• Moving Farm to co-location hosting - network settings requirements

  - by Saariko

  I am moving my farm (2 Dell's R620) to a co-location hosting service. I am trying to figure out the secure way to have my network settings The requirements are: VM1 is the working HOST, includes: esxi 5.1, vSphere, 4 clients (w2008r2 all) VM2 has esxi 5.1 installed, and a single machine with Veeam Backup and copy 6.5 - keeping a copy of VM1 clients on the VM2 internal storage (this solution is due to a very small budget - in case of failure on Host 1 - can redirect IP's) Only 2 VM clients require network address and access from the WWAN - ISP provides IP's range for them (with Gateway and DNS) I need connection to the iDrac's from my office (option to create a VPN-SSL tunnel) Connection to the vSphere appliances I want to be able to RDP to the VM clients The current configuration is that each host has the iDrac dedicated nic connected , and another (NIC #1) connected - with a static IP on 192.168.3.x The iDrac's have a static IP from the same network range (19.168.3.x) It will look something like this: My thoughts: On NIC#2 of both hosts I will connected a crossed cable I will give each VM clients that needs internet access a 2ndry VM network with the assigned IP from the ISP open only to web - can not access from the My Question: Should I give IP's (external) to the machines who DO NOT require WWAN Access? - I can't see a way to RDP to them directly if not. Should I use the crossed cable? or just plug NIC #2 to the switch? Will this setup even work? What do I need to verify? What Virtual nic's and/or switches should I create on the Hosts?

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