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  • Trying to understand why VLANs need to be created on intermediate switches

    - by Jon Reeves
    I'm currently studying for the Cisco switching exam and having trouble understanding exactly how 802.1q tagging works. Given three daisy chained switches (A,B, and C) with trunk ports between them and VLAN 101 defined on both end switches (A and C), I'm not sure why the VLAN also needs to be defined on the middle one (B)? Note that I am not disputing that it does need to be configured, I'm just trying to understand why exactly. As I understand it, traffic from VLAN 101 on switch A will be tagged as it goes through the trunk to switch B. According to the documentation I have read, trunks will pass all VLANs by default, and the .1q tag is only removed when the frame leaves through an access port on the relevant VLAN. From this I would expect switch B to simply forward the tagged frame unchanged through the trunk to switch C. Can anyone shed some light on how switch B processes this frame and why it does not get forwarded through the other trunk ?

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  • Please help, I am losing my data?

    - by 5YrsLaterDBA
    I was trying to remove MSDN Library-January 2002 by using Revo Uninstaller. I allowed it to delelet those leftover registry entries(my fault, i should be more careful and don't do that). Now my machine is almost unaccessible, cannot open that Revo Uninstaller to recovery, cannot open Windows Explorer, cannot run CMD command from run, all executable shortcuts are not work anymore. I guess I have to reinstall everything but how can I get my data out of the machine? It is a Dell laptop with Windows XP. I am afraid if I restart my machine, my machine will not come back anymore. Please help.

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  • CELLPHONE's wifi makes my wireless router disconnect Plz Help me

    - by wifiprobodude
    Hey guys i have a problem. For 7 months now, i have been dealing with internet problems. But i finally found out why my wireless router has been disconnecting randomly. Everytime I enable wifi on my cellphone, my whole router disconnects and lose internet untill i swtich the wifi off on my phone. I dont understand why this is doing this Can anyone help has this happend to you? htc android-wifi everyday-problems And Just to findout it happens with all wifi devices?

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  • Help with Rewrite rules.

    - by Kyle
    I was wondering what a rewrite statement that looks for this situation. I want to have multiple users on my server. Each user can have 'VirtualDocumentRoot' like sites in his directory. For example, they just make a directory like 'example.com' in their home directory, and it's hosted. The problem is I don't know if VirtualDocumentRoot can do this, or if it would take a rewrite rule that looks in all the users folders for a domain. Can anybody help me?

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  • Help creating image from LVM

    - by jackhab
    I need to duplicate CentOS hard drive image for multiple stations. The HD has the following layout: Disk /dev/sdb: 250GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 107MB 107MB primary ext3 boot 2 107MB 250GB 250GB primary lvm I saved /dev/sdb1 to file with fsarchiver but for sdb2 I get: /fsarchiver savefs an2.fsa /dev/sdb2 oper_save.c#1006,filesystem_mount_partition(): can't detect and mount filesystem of partition [/dev/sdb2], cannot continue. removed an2.fsa Although fsarchiver probe simple correctly detects sdb2 as LVM2_member. Is fsarchiver correct tool for this job? What's wrong? I'm on Ubuntu 9.1 with fsarchiver 0.6.8 and lvm tools installed. Thanks.

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  • Help creating image from LVM

    - by jackhab
    I need to duplicate CentOS hard drive image for multiple stations. The HD has the following layout: Disk /dev/sdb: 250GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 107MB 107MB primary ext3 boot 2 107MB 250GB 250GB primary lvm I saved /dev/sdb1 to file with fsarchiver but for sdb2 I get: /fsarchiver savefs an2.fsa /dev/sdb2 oper_save.c#1006,filesystem_mount_partition(): can't detect and mount filesystem of partition [/dev/sdb2], cannot continue. removed an2.fsa Although fsarchiver probe simple correctly detects sdb2 as LVM2_member. Is fsarchiver correct tool for this job? What's wrong? I'm on Ubuntu 9.1 with fsarchiver 0.6.8 and lvm tools installed. Thanks.

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  • Need IPSec help on Windows 2003

    - by user37456
    Hey guys, I am trying to configure IPSec between a web and app server in our environment. I want all traffic between these two servers to use IPsec and be encrypted. These servers are on the same domain so i am currently using Kerebos for security, I have also tried pre-defined keys and nothing changed. When I try and ping between the servers I get "Negotiating IP Security" everytime. I have also confirmed that when I change "Require Security" to "Permit" everything works so IPSec is working, I believe its something with my security setup. Under the security tab both servers have the default 3DES keys first and then DES keys. I have also specified tunnel endpoints (the alternate server's IP). What am I missing? Thanks for any help..

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  • What ports does Advantage Database Server need?

    - by asherber
    I have an application which uses ADS and I am attempting to deploy it in a Windows network environment with a rather restrictive firewall. I am having a problem configuring firewall ports appropriately. ADS lives on \\server, and it's listening on port 1234. When \\client tries to connect to \\server\tables, I get Error 6420 (Discovery process failed). When \client tries to connect to \\server:1234\tables, I get error 6097, bad IP address specified in the connection path. \\server is pingable from \\client, and I can telnet to \server:1234. If I try to connect from a client machine inside the firewall, either connection path works fine. It seems there must be something else I need to open in the firewall. Any ideas? Thanks, Aaron. Edit: I should have specified that the firewall is open to \\server:1234 specifically for TCP traffic. Is UDP involved here in some way?

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  • [SOLVED]Need help with remote dekstop - Limit the computers you can access server from

    - by stirredo
    I have a windows server 2003 computer that is accessed by remote desktop connection. To access the server all you need to know is the IP address of the computer. I want to limit the computers that can access the windows server computer to authorized computers only. The authorized computers won't have static IPs, so I cannot limit them on basis of IP address. Can I limit them on basis of MAC id perhaps? I won't mind using third party solution like Teamviewer or Logmein etc. So How can I solve this problem? EDIT: Found a possible solution in team viewer. Team viewer creates a unique partner ID for the computer it is installed on. It has an option for allowing only authorized partner IDs to access the computer. Problem solved.

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  • Need to use DART, can't access windows at all

    - by Jack
    I have an install of windows server R2. After installing two patches, the system is stuck in a reboot loop. I wish to uninstall these patches to revert my stsem to normal. I have looked at dism, but it does not seem to provide a way to uninstall specific MSP patches. I don't believe I can utilize msiexec in WinRE to uninstall the patches. And so, I believe DART is what I need, which will allow me to uninstall specific patches. However, I cannot access my install of windows at all, which is what is apparently needed to make the dart media. Is there any way around this?

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  • Need help diagnosing cause of BSOD

    - by n00neimp0rtant
    I've got a Windows 7 PC here that was getting very frequent BSODs. The error codes were variant (IRQL_NOT_LESS_OR_EQUAL, PAGE_FAULT_IN_NONPAGED_AREA, ATTEMPTED_WRITE_TO_READONLY_MEMORY), and it was impossible to use the computer for longer than an hour without getting one. I backed it all up and reinstalled Windows completely, thinking that it was a corrupt driver issue. Unfortunately, I'm still getting the BSODs with the same error messages on this fresh installation. This tells me that it must be some faulty piece of hardware, but I'm not sure what it would be. I ran Memtest+ on the machine, but did not get any errors after 2 passes. I also ran a few built-in recovery mode scans from the HP recovery partition. I need some ideas on how to test the rest of the hardware to solve this issue.

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  • portal/forum for small companies to get technology help

    - by thomas
    I understand this is an open ended question and not quite sure how to add this to community wiki, if that is appropriate. I am doing a little research on where small companies would go on the internet to get answers for technology related questions. Could be around sales, servers, programming, etc. Clearly superuser.com, serverfault.com, and stackoverflow.com are excellent starting points. I am just wondering if anyone has heard of any others. Think a "facebook" that links technology providers with small companies to help answer questions and potentially provide/offer solutions. Thanks!

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  • What ports do I need open for IMAP connections

    - by iamjonesy
    I'm developing a web application that connects to an IMAP mailbox and fetches emails as part of it's functionality. The application is PHP and I'm connecting like this: public function connect() { /* connect to gmail */ $hostname = '{imap.gmail.com:993/imap/ssl}INBOX'; $username = $this->username; $password = $this->password; /* try to connect */ $this->inbox = imap_open($hostname,$username,$password) or die('Cannot connect to Gmail: ' . imap_last_error()); } Developing locally on my mac this was fine, I was able to connect and get emails. However now that I've put the app on my web hosts server I'm getting the following error: Cannot connect to Gmail: Can't connect to gmail-imap.l.google.com,993: Connection timed out After checking with my hosting provider they told me outgoing connections on port 993 are blocked. Is there anyway around this? Otherwise I need to upgrade to a dedicated server :S

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  • Why do we need Hash by key? [migrated]

    - by Royi Namir
    (i'm just trying to find what am I missing...) Assuming John have a clear text message , he can create a regular hash ( like md5 , or sha256) and then encrypt the message. John can now send Paul the message + its (clear text)hash and Paul can know if the message was altered. ( decrypt and then compare hashes). Even if an attacker can change the encrpyted data ( without decrypt) - - when paul will open the message - and recalc the hash - it wont generate the same hash as the one john sent him. so why do we need hash by key ?

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  • help setting up an IPSEC vpn from my linux box

    - by robthewolf
    I have an office with a router and a remote server (Linux - Ubuntu 10.10). Both locations need to connect to a data supplier through a VPN. The VPN is an IPSEC gateway. I was able to configure my Linksys rv42 router to create a VPN connection successfully and now I need to do the same for Linux server. I have been messing around with this for too long. First I tried OpenVPN, but that is SSL and not IPSEC. Then I tried Shrew. I think I have the settings correct but I haven't been able to create the connection. It maybe that I have to use something else like a direct IPSEC config or something like that. If someone knows of a way to turn the following settings that I have been given below into a working IPSEC VPN connection I would be very grateful. Here are the settings I was given that must be used to connect to my supplier: Local destination network: 192.168.4.0/24 Local destination hosts: 192.168.4.100 Remote destination network: 192.167.40.0/24 Remote destination hosts: 192.168.40.27 VPN peering point: xxx.xxx.xxx.xxx Then they have given me the following details: IPSEC/ISAKMP Phase 1 Parameters: Authentication method: pre shared secret Diffie Hellman group: group 2 Encryption Algorithm: 3DES Lifetime in seconds:28800 Phase 2 parameters: IPSEC security: ESP Encryption algortims: 3DES Authentication algorithms: MD5 lifetime in seconds: 28800 pfs: disabled Here are the settings from my attempt to use shrew: n:version:2 n:network-ike-port:500 n:network-mtu-size:1380 n:client-addr-auto:0 n:network-frag-size:540 n:network-dpd-enable:1 n:network-notify-enable:1 n:client-banner-enable:1 n:client-dns-used:1 b:auth-mutual-psk:YjJzN2QzdDhyN2EyZDNpNG42ZzQ= n:phase1-dhgroup:2 n:phase1-keylen:0 n:phase1-life-secs:28800 n:phase1-life-kbytes:0 n:vendor-chkpt-enable:0 n:phase2-keylen:0 n:phase2-pfsgroup:-1 n:phase2-life-secs:28800 n:phase2-life-kbytes:0 n:policy-nailed:0 n:policy-list-auto:1 n:client-dns-auto:1 n:network-natt-port:4500 n:network-natt-rate:15 s:client-dns-addr:0.0.0.0 s:client-dns-suffix: s:network-host:xxx.xxx.xxx.xxx s:client-auto-mode:pull s:client-iface:virtual s:client-ip-addr:192.168.4.0 s:client-ip-mask:255.255.255.0 s:network-natt-mode:enable s:network-frag-mode:disable s:auth-method:mutual-psk s:ident-client-type:address s:ident-client-data:192.168.4.0 s:ident-server-type:address s:ident-server-data:192.168.40.0 s:phase1-exchange:aggressive s:phase1-cipher:3des s:phase1-hash:md5 s:phase2-transform:3des s:phase2-hmac:md5 s:ipcomp-transform:disabled Finally here is the debug output from the shrew log: 10/12/22 17:22:18 ii : ipc client process thread begin ... 10/12/22 17:22:18 < A : peer config add message 10/12/22 17:22:18 DB : peer added ( obj count = 1 ) 10/12/22 17:22:18 ii : local address 217.xxx.xxx.xxx selected for peer 10/12/22 17:22:18 DB : tunnel added ( obj count = 1 ) 10/12/22 17:22:18 < A : proposal config message 10/12/22 17:22:18 < A : proposal config message 10/12/22 17:22:18 < A : client config message 10/12/22 17:22:18 < A : local id '192.168.4.0' message 10/12/22 17:22:18 < A : remote id '192.168.40.0' message 10/12/22 17:22:18 < A : preshared key message 10/12/22 17:22:18 < A : peer tunnel enable message 10/12/22 17:22:18 DB : new phase1 ( ISAKMP initiator ) 10/12/22 17:22:18 DB : exchange type is aggressive 10/12/22 17:22:18 DB : 217.xxx.xxx.xxx:500 <- 206.xxx.xxx.xxx:500 10/12/22 17:22:18 DB : c1a8b31ac860995d:0000000000000000 10/12/22 17:22:18 DB : phase1 added ( obj count = 1 ) 10/12/22 17:22:18 : security association payload 10/12/22 17:22:18 : - proposal #1 payload 10/12/22 17:22:18 : -- transform #1 payload 10/12/22 17:22:18 : key exchange payload 10/12/22 17:22:18 : nonce payload 10/12/22 17:22:18 : identification payload 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v00 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v01 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v02 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v03 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( rfc ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports DPDv1 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is SHREW SOFT compatible 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is NETSCREEN compatible 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is SIDEWINDER compatible 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is CISCO UNITY compatible 10/12/22 17:22:18 = : cookies c1a8b31ac860995d:0000000000000000 10/12/22 17:22:18 = : message 00000000 10/12/22 17:22:18 - : send IKE packet 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 ( 484 bytes ) 10/12/22 17:22:18 DB : phase1 resend event scheduled ( ref count = 2 ) 10/12/22 17:22:18 ii : opened tap device tap0 10/12/22 17:22:28 - : resend 1 phase1 packet(s) 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 10/12/22 17:22:38 - : resend 1 phase1 packet(s) 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 10/12/22 17:22:48 - : resend 1 phase1 packet(s) 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 10/12/22 17:22:58 ii : resend limit exceeded for phase1 exchange 10/12/22 17:22:58 ii : phase1 removal before expire time 10/12/22 17:22:58 DB : phase1 deleted ( obj count = 0 ) 10/12/22 17:22:58 ii : closed tap device tap0 10/12/22 17:22:58 DB : tunnel stats event canceled ( ref count = 1 ) 10/12/22 17:22:58 DB : removing tunnel config references 10/12/22 17:22:58 DB : removing tunnel phase2 references 10/12/22 17:22:58 DB : removing tunnel phase1 references 10/12/22 17:22:58 DB : tunnel deleted ( obj count = 0 ) 10/12/22 17:22:58 DB : removing all peer tunnel refrences 10/12/22 17:22:58 DB : peer deleted ( obj count = 0 ) 10/12/22 17:22:58 ii : ipc client process thread exit ...

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  • Modern monitor technologies - need to find a new monitor

    - by Michal Minicki
    I'm preparing to change my old LCD monitor for a new one. I have an old NEC 20WGX2 Pro based on an IPS panel. I'm looking for a screen that gives good color output but is very good at gaming at the same time (since it is its primary service). I tend to switch monitors between my different computers at home so it has to be multi purpose, hence IPS technology before. Now, where can I read on newest monitor technologies so I can make an informed decision? I need to find a best fit for myself and I have a very outdated knowledge at the moment. So any hints are greatly appreciated, be it info on technologies, web sources, links to other questions, etc.

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  • need help writing puppet module for sssd.conf using Hiera

    - by mr.zog
    I need to build a module to manage /etc/sssd/sssd.conf on our Red Hat VMs. The sssd modules published on the forge don't seem to do what I want, nor do I feel like forking any of them. I want to keep all the configuration data in Hiera's common.yaml file. Below is my sssd.conf file. [sssd] config_file_version = 2 services = nss, pam domains = default [nss] filter_groups = root filter_users = root reconnection_retries = 3 entry_cache_timeout = 300 entry_cache_nowait_percentage = 75 [pam] [domain/default] auth_provider = ldap ldap_id_use_start_tls = True chpass_provider = ldap cache_credentials = True ldap_search_base = dc=ederp,dc=com id_provider = ldap ldap_uri = ldaps://lvldap1.lvs01.ederp.com/ ldaps://lvldap2.lvs01.ederp.com/ ldap_tls_cacertdir = /etc/openldap/cacerts What is the best, most economical way to build the sssd.conf file? Should I have multiple .pp files such as domain.pp, pam.pp etc. or should all the lines of configuration land in init.pp?

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  • Help me to set samba and apache on my Ubuntu VM from Vista, starting from ping

    - by avastreg
    Ok the title is not so clear after all, so let's start with the problem description posting some points: i'm on Win Vista i have a Virtual Box Ubuntu 9.04 server (Virtual Machine) installed in windows i'm under Active Directory (maybe helps), with network 192.168.2.x After Ubuntu installation (LAMP), i have: Ubuntu Ip set to 10.0.2.15 (dhcp) Vista pings Ubuntu and Ubuntu pings Vista (only IPs, not names) Can't connect to Apache (default install ubuntu server) at the url h**p://10.0.2.15/ On Ubuntu, testing Apache by doing 'wget http://10.0.2.15/' works Tried to setup samba, writing a share def, but nothing, i can't access from Vista to Ubuntu My scope is: Setting up samba to work on files from windows Reaching apache to test web pages Ok i'm not completely noob (but i'm on the noob way anyway) and i've tried many solutions, so please try to help me; let's look together what went wrong :)

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  • BSOD > Help interpret this crash? [DMP file]

    - by feed_me_code
    System just crashed, below here is event view details.. Been running GREAT for last few days.. First crash since.. DMP File link below.. Can someone please help interpret this crash? Thanks The computer has rebooted from a bugcheck. The bugcheck was: 0x000000d1 (0x00001000000102fd, 0x0000000000000002, 0x0000000000000000, 0xfffff88010143afd). A dump was saved in: C:\Windows\Minidump\052714-23010-01.dmp. Report Id: 052714-23010-01. https://www.dropbox.com/s/ag19ejkrddnjjct/052714-23010-01.dmp

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  • Need help. HDD Failed

    - by jiewmeng
    i have a seagate 3.5" 500GB SATA2 HDD that i put in a USB case (vantec) that failed recently. symptoms: at first, it started except that attempts made to browse certain folders resulted in "Data Error (Cyclic Redundancy Check)". then when i tried restarting the hdd, then i got a RAW partition, and windows 7 said i need to format it. i also tried using a desktop to connect to the HDD directly using SATA, windows 7 stuck at "starting windows" for abt half hour b4 i gave up on it. in the BIOS, it seems to detect the HDD model correctly, something like STA3500xxx something like that i also tried using TestDisk as suggested by jaclaz on MSFN and it did not find any partitions what could i do now?

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  • Need advice on PC components for high-end games but in limited budget

    - by Md Atif
    I need advise, I want to buy PC components which will be good for gaming as well as be under my budget. First thing I chose is Graphics card : ATI HD 7850 2GB DDR5 then matching things up with this selected following: Processor: AMD 3.5 GHz AM3 FX 8320 8 Core Piledriver Mobo: MSI 990FXA-GD65 RAM : 8GB DDR3 (4x2) Is this setup looks compatible? If making any of above component inferior will have negligible affect on performance/gaming(like buying 970 chip mobo instead of 990) then please let me know so I can save some money :) ? Any other advice?

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  • Need to upgrade DDR2 RAM on HP Desktop

    - by jds
    I have this HP Pavilion Desktop. As you can see, that page says the memory speed supported is PC2-4200. It currently has a 512 MB stick - CPU-Z Screenshots: hxxp://i41.tinypic.com/j5clj6.jpg and hxxp://i39.tinypic.com/20tldlc.jpg However, a crucial.com scan gives a slightly different report - hxxp://crucial.com/systemscanner/viewscanbyid.aspx?id=5718CFE831D926C3 It says the system can support PC2-5300 memory. So my question is which one should I trust? I want to upgrade the computer's ram to 2 GB (the maximum supported), because XP Media Center is giving me problems and I will install Windows 7 on this. PC2-6400 is the most common DDR2 memory I have been able to find here in the market. Will it cause any problems if I install 2 × 1 GB PC2-6400 DDR2 memory sticks (in dual channel) in this computer, (afaik, it will just run at the lower speed of 533 MHz, or whatever the motherboard supports), or do I absolutely need to get PC2-4200 sticks?

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  • Internet addicted, need software to control my usage and block access

    - by user69991
    I found I have problem to be a little addictive with surfing on internet. I am trying to find a free ware, (or software), that can help me for exemple to be just 2 hours per day on internet. Like it is counting the minutes and than stop working. not just 2 hours in one time, but in whole day.... maybe that it has different modes (2hours together, in whole day, 2hours + little reserve time) but I need something that really take me away access from internet :) Just counting time, is not enough for me :) Hope we will find something because, I just can't avoid not to loose 4 hours on internet. I have windows 7

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  • IIS 7.5 Rewrite help needed

    - by Nolan Berry
    I am trying to do something extremely straightforward. I just need to force SSL and I am trying to use the URl Rewrite plugin. I am getting no results when I put the following rule into my conf. <rewrite> <rules> <rule name="Redirect to https" stopProcessing="true"> <match url="(.*)[^/])$" /> <conditions> <add input="{SERVER_PORT}" pattern="443" negate="true" /> </conditions> <action type="Redirect" url="https://{HTTP_HOST}{REQUEST_URI}" /> </rule> </rules> </rewrite> Any thoughts on why this isn't catching?

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  • Need Boxee/Vista remote control recommendations

    - by gurun8
    I have an Acer Aspire X1200 (specs link below) desktop computer that I've installed Boxee on and it works great. And it looks like it's going to be a perfect computer for a media player. It's small with lots of hard drive space and even has a HDMI output on it. http://support.acer.com/acerpanam/desktop/0000/Acer/AspireX1200/AspireX1200sp2.shtml I also have a Harmony® 880 Advanced Universal Remote (specs link below) that I'd like to use with the Acer computer. www.logitech.com/en-us/440/372 My thought is that I need to get a USB remote control adapter, right? So I did a quick Google search and found products from $5 to hundreds of $$$. Does anyone have recommendations? Things you like/dislike about certain remotes? This Acer is running Vista and has a AMD LIVE!: Athlon X2 dual-core processor. 64 bit some times makes it a little more difficult. Thanks for the help.

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