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• How can I chainload a USB drive from GRUB2?

  - by magic.plane

  I'm using GNU GRUB version 1.99-12ubuntu5, booted over the network using PXE. I used grub-mknetdir to generate the GRUB image and directory tree, which I'm serving on a TFTP server using Tftpd32 in Windows. I've put the latest version of Clonezilla on my USB drive using Tuxboot. Right now, in GRUB's CLI, using ls lists only the (pxe) device, even if the USB drive is plugged in before the computer is on. Is there any way I can chainload Clonezilla on my USB from GRUB, which is booted over the network?

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• Linked Tables not working With Access Database

  - by Kronass

  Hi, I have an Access database in a computer and I want to access it from other computer in the network. so I made mapped drive and created Linked Tables, then Imported all the objects (forms, queries, reports). when I open access database in the second computer and make any changes in using the forms non of the changes are affected in the main computer (supposedly server) and vise-versa. what am I missing? if this way will not work how can I access the Access database from other computer in the network and be able to use all the objects and make changes in it? hint: Access Version at main computer is 2003 and client pc 2007, will it effect?

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• How should one manager external and internal DNS servers at the same time?

  - by erotsppa

  We run a mac network here in the office. We have an internal DNS server to manage the network. Everything is resolved to a local ip (for mail.mydomain.com etc). However, we also have an external DNS server for when our users are not in the office. However, isn't it a pain to have to manage two lists? Whenever you change something you have to change another? And you can't have one be a slave of another because the ip are sometimes different (for example mail.mydomain.com would point to a local ip in local dns server but an external ip in the external dns server). Any tricks?

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• Relay Access Denied (State 13) Postfix + Dovecot + Mysql

  - by Pierre Jeptha

  So we have been scratching our heads for quite some time over this relay issue that has presented itself since we re-built our mail-server after a failed Webmin update. We are running Debian Karmic with postfix 2.6.5 and Dovecot 1.1.11, sourcing from a Mysql database and authenticating with SASL2 and PAM. Here are the symptoms of our problem: 1) When users are on our local network they can send and receive 100% perfectly fine. 2) When users are off our local network and try to send to domains not of this mail server (ie. gmail) they get the "Relay Access Denied" error. However users can send to domains of this mail server when off the local network fine. 3) We host several virtual domains on this mailserver, the primary domain being airnet.ca. The rest of our virtual domains (ex. jeptha.ca) cannot receive email from domains not hosted by this mailserver (ie. gmail and such cannot send to them). They receive bounce backs of "Relay Access Denied (State 13)". This is regardless of whether they are on our local network or not, which is why it is so urgent for us to get this solved. Here is our main.cf from postfix: myhostname = mail.airnet.ca mydomain = airnet.ca smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no smtpd_sasl_type = dovecot queue_directory = /var/spool/postfix smtpd_sasl_path = private/auth smtpd_sender_restrictions = permit_mynetworks permit_sasl_authenticated smtp_sasl_auth_enable = yes smtpd_sasl_auth_enable = yes append_dot_mydomain = no readme_directory = no smtp_tls_security_level = may smtpd_tls_security_level = may smtp_tls_note_starttls_offer = yes smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_auth_only = no alias_maps = proxy:mysql:/etc/postfix/mysql/alias.cf hash:/etc/aliases alias_database = hash:/etc/aliases mydestination = mail.airnet.ca, airnet.ca, localhost.$mydomain mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 recipient_delimiter = + local_recipient_maps = $alias_maps $virtual_mailbox_maps proxy:unix:passwd.byname home_mailbox = /var/virtual/ mail_spool_directory = /var/spool/mail mailbox_transport = maildrop smtpd_helo_required = yes disable_vrfy_command = yes smtpd_etrn_restrictions = reject smtpd_data_restrictions = reject_unauth_pipelining, permit show_user_unknown_table_name = no proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $virtual_mailbox_limit_maps $virtual_uid_maps $virtual_gid_maps virtual_alias_domains = message_size_limit = 20971520 transport_maps = proxy:mysql:/etc/postfix/mysql/vdomain.cf virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql/vmailbox.cf virtual_alias_maps = proxy:mysql:/etc/postfix/mysql/alias.cf hash:/etc/mailman/aliases virtual_uid_maps = proxy:mysql:/etc/postfix/mysql/vuid.cf virtual_gid_maps = proxy:mysql:/etc/postfix/mysql/vgid.cf virtual_mailbox_base = / virtual_mailbox_limit = 209715200 virtual_mailbox_extended = yes virtual_create_maildirsize = yes virtual_mailbox_limit_maps = proxy:mysql:/etc/postfix/mysql/vmlimit.cf virtual_mailbox_limit_override = yes virtual_mailbox_limit_inbox = no virtual_overquote_bounce = yes virtual_minimum_uid = 1 maximal_queue_lifetime = 1d bounce_queue_lifetime = 4h delay_warning_time = 1h append_dot_mydomain = no qmgr_message_active_limit = 500 broken_sasl_auth_clients = yes smtpd_sasl_path = private/auth smtpd_sasl_local_domain = $myhostname smtpd_sasl_security_options = noanonymous smtpd_sasl_authenticated_header = yes smtp_bind_address = 142.46.193.6 relay_domains = $mydestination mynetworks = 127.0.0.0, 142.46.193.0/25 inet_interfaces = all inet_protocols = all And here is the master.cf from postfix: # ========================================================================== # service type private unpriv chroot wakeup maxproc command + args # (yes) (yes) (yes) (never) (100) # ========================================================================== smtp inet n - - - - smtpd #submission inet n - - - - smtpd # -o smtpd_tls_security_level=encrypt # -o smtpd_sasl_auth_enable=yes # -o smtpd_client_restrictions=permit_sasl_authenticated,reject # -o milter_macro_daemon_name=ORIGINATING #smtps inet n - - - - smtpd # -o smtpd_tls_wrappermode=yes # -o smtpd_sasl_auth_enable=yes # -o smtpd_client_restrictions=permit_sasl_authenticated,reject # -o milter_macro_daemon_name=ORIGINATING #628 inet n - - - - qmqpd pickup fifo n - - 60 1 pickup cleanup unix n - - - 0 cleanup qmgr fifo n - n 300 1 qmgr #qmgr fifo n - - 300 1 oqmgr tlsmgr unix - - - 1000? 1 tlsmgr rewrite unix - - - - - trivial-rewrite bounce unix - - - - 0 bounce defer unix - - - - 0 bounce trace unix - - - - 0 bounce verify unix - - - - 1 verify flush unix n - - 1000? 0 flush proxymap unix - - n - - proxymap proxywrite unix - - n - 1 proxymap smtp unix - - - - - smtp # When relaying mail as backup MX, disable fallback_relay to avoid MX loops relay unix - - - - - smtp -o smtp_fallback_relay= # -o smtp_helo_timeout=5 -o smtp_connect_timeout=5 showq unix n - - - - showq error unix - - - - - error retry unix - - - - - error discard unix - - - - - discard local unix - n n - - local virtual unix - n n - - virtual lmtp unix - - - - - lmtp anvil unix - - - - 1 anvil scache unix - - - - 1 scache maildrop unix - n n - - pipe flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient} # # See the Postfix UUCP_README file for configuration details. # uucp unix - n n - - pipe flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient) # # Other external delivery methods. # ifmail unix - n n - - pipe flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient) bsmtp unix - n n - - pipe flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient scalemail-backend unix - n n - 2 pipe flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension} mailman unix - n n - - pipe flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py ${nexthop} ${user} spfpolicy unix - n n - - spawn user=nobody argv=/usr/bin/perl /usr/sbin/postfix-policyd-spf-perl smtp-amavis unix - - n - 4 smtp -o smtp_data_done_timeout=1200 -o smtp_send_xforward_command=yes -o disable_dns_lookups=yes #127.0.0.1:10025 inet n - n - - smtpd dovecot unix - n n - - pipe flags=DRhu user=dovecot:21pever1lcha0s argv=/usr/lib/dovecot/deliver -d ${recipient Here is Dovecot.conf protocols = imap imaps pop3 pop3s disable_plaintext_auth = no log_path = /etc/dovecot/logs/err info_log_path = /etc/dovecot/logs/info log_timestamp = "%Y-%m-%d %H:%M:%S ". syslog_facility = mail ssl_listen = 142.46.193.6 ssl_disable = no ssl_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem ssl_key_file = /etc/ssl/private/ssl-cert-snakeoil.key mail_location = mbox:~/mail:INBOX=/var/virtual/%d/mail/%u mail_privileged_group = mail mail_debug = yes protocol imap { login_executable = /usr/lib/dovecot/imap-login mail_executable = /usr/lib/dovecot/rawlog /usr/lib/dovecot/imap mail_executable = /usr/lib/dovecot/gdbhelper /usr/lib/dovecot/imap mail_executable = /usr/lib/dovecot/imap imap_max_line_length = 65536 mail_max_userip_connections = 20 mail_plugin_dir = /usr/lib/dovecot/modules/imap login_greeting_capability = yes } protocol pop3 { login_executable = /usr/lib/dovecot/pop3-login mail_executable = /usr/lib/dovecot/pop3 pop3_enable_last = no pop3_uidl_format = %08Xu%08Xv mail_max_userip_connections = 10 mail_plugin_dir = /usr/lib/dovecot/modules/pop3 } protocol managesieve { sieve=~/.dovecot.sieve sieve_storage=~/sieve } mail_plugin_dir = /usr/lib/dovecot/modules/lda auth_executable = /usr/lib/dovecot/dovecot-auth auth_process_size = 256 auth_cache_ttl = 3600 auth_cache_negative_ttl = 3600 auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@ auth_verbose = yes auth_debug = yes auth_debug_passwords = yes auth_worker_max_count = 60 auth_failure_delay = 2 auth default { mechanisms = plain login passdb sql { args = /etc/dovecot/dovecot-sql.conf } userdb sql { args = /etc/dovecot/dovecot-sql.conf } socket listen { client { path = /var/spool/postfix/private/auth mode = 0660 user = postfix group = postfix } master { path = /var/run/dovecot/auth-master mode = 0600 } } } Please, if you require anything do not hesistate, I will post it ASAP. Any help or suggestions are greatly appreciated! Thanks, Pierre

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• Podcast Show Notes: Red Room Interview &ndash; Part 3: Ninja BPM

  - by Bob Rhubart

  The third and final segment of my conversation with Red Room bloggers Sean Boiling, Richard Ward, and Mervin Chaing is now available. Listen to Part 1 Listen to Part 2 Listen to Part 3 As you’ll hear, this segment gets its title from another example of Mervin’s tactic for tweaking terminology to make it easier to sell stakeholders on certain SOA concepts. These are some very bright, very knowledgeable guys, so I encourage you to connect with them via the links below to pick their brains on any SOA or related issues that might have you reaching for the aspirin bottle. Sean Boiling - Sales Consulting Manager for Oracle Fusion Middleware LinkedIn | Twitter | Blog Richard Ward - SOA Channel Development Manager at Oracle LinkedIn | Blog Mervin Chiang - Consulting Principal at Leonardo Consulting LinkedIn | Twitter | Blog Once again, you’ll find the complete list of Red Room SOA Best Practice Posts in here. Up Next Next week’s program features another panel discussion recorded during a virtual min meet-up. The panel includes Oracle ACE Directors Mike van Alst (IT-Eye) and Jordan Braunstein (TUSC) along with The Definitive Guide to SOA: Oracle Service Bus author Jeff Davies. Stay tuned: RSS   Technorati Tags: oracle technology network,oracle,archbeat,podcast. arch2arch,soa,bpm del.icio.us Tags: oracle technology network,oracle,archbeat,podcast. arch2arch,soa,bpm

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• On setting up Apache and IIS to share the same IP

  - by miCRoSCoPiCeaRthLinG

  Hello, There are two different web-apps running on two (physically) different servers on our network... one of IIS and another one on Apache - both on port 80 since two machines are accessible by different IPs on our internal network. Now I want to expose both these services to the world. My idea is to somehow make the incoming connection redirect to the appropriate server based on user's choice of subdomain. Example xxx.domain.com maps to the IIS (Internal IP: 1.2.3.4) yyy.domain.com maps to Apache (Internal IP: 5.6.7.8) To the world, both these servers will share the same public IP. What kind of a configuration am I looking at and how do I go about trapping the subdomain requests and redirecting to the appropriate server? Thanks, m^e

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• Can not change to a static IP in Fedora 19

  - by user196272

  Im having a bit of a weird situation. Ive installed Fedora Linux 19 onto a virtual machine with no GUI. initially eth0 does not show up when I perform ifconfig. when I run dmesg | grep eth I see the adapter but it says it changed names to p2p1. Once I perform the ifconfig p2p1 up command it shows up. Now when I try to edit the /etc/sysconfig/network-scripts/ifcfg-p2p1, it does not exist. the only scripts that are there lo and enp0s3. If I try to create the ifcfg-p2p1 file with the correct settings, I can not restart the network service. I tried editing the enp0s3 file, but that did not work. Im fairly new to linux and not sure what else to put in here, so if you need any more information just let me know and Ill put it in here.

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• How do you add a certificate for WLAN in Linux, at the command-line?

  - by Neil

  I'm using Maemo on a Nokia n810 Internet tablet, and when given a list of installed certificates to choose from when connecting to a PEAP wireless network, it's always blank. I've already installed a couple of certificates through the gui on the device, and only the certificate authorities show up. I've confirmed that Maemo's connection software that handles certificates is buggy, in such a way that certificates are never added, or properly added certificates cannot be found. Is there a way to add WLAN certificates at the command-line, and connect to a wireless network at the command-line as well? I used to use iwconfig to connect, but I never used it with PEAP. Note: I have nothing in /etc/ssl/certs

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• Remote Access Problems with DRAC 5 on Dell PowerEdge 1950

  - by Darin Peterson

  Today I received my first Dell PowerEdge 1950 server with a DRAC 5 card. On my local network I have static configurations on my Linux systems using this for instance: iface eth0 inet static address 192.168.1.210 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.1 dns-nameservers 8.8.8.8 8.8.4.4 For the DRAC card, I configured the LAN like this: address 192.168.1.215 netmask 255.255.255.0 gateway 192.168.1.1 For the advanced LAN settings I used dns-nameservers 8.8.8.8 8.8.4.4 I've tried many different IP addresses, but cannot communicate with the card. Is there anyone who might know if I have configuration issues, or maybe if the card might be bad?

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• PXE in an 802.1X environment

  - by newmanth

  My organization is about to implement 802.1X on our enterprise, but we currently use PXE-based OS deployment sequences in SCCM. I'm looking for a way to continue using PXE in an 802.1X environment. Our infrastructure uses Cisco network gear running at 12.2 (or newer). We are an all Windows network and all clients support 802.1X. All new workstations have Intel AMT available (but not factory configured). In a worst case scenario, we'll use a guest vlan for OSD, but I'd rather have the OSD occur in an authenticated session. I've seen white papers that describe using AMT to act as a supplicant for PXE boot, but can't find any implementation details...

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• How to recover basic networking utilities on Debian?

  - by Rizo

  I am administrating a small server for LAN, providing basic services such as web-proxy, ldap, kerberos, afs, etc. Yesterday there was a power cut so server halted. When I restarted it no network interfaces were available and configured. I tried restarting networking daemon but it just exited with 0 status. So I tried to run one of the interfaces manually, but ifup and ifdown commands simply are not there. No only in PATH, but they disappeared from /sbin. So my question is: how can I recover these network utilities?

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• Measuring Code Quality

  - by DotNetBlues

  Several months back, I was tasked with measuring the quality of code in my organization. Foolishly, I said, "No problem." I figured that Visual Studio has a built-in code metrics tool (Analyze -> Calculate Code Metrics) and that would be a fine place to start with. I was right, but also very wrong. The Visual Studio calculates five primary metrics: Maintainability Index, Cyclomatic Complexity, Depth of Inheritance, Class Coupling, and Lines of Code. The first two are figured at the method level, the second at (primarily) the class level, and the last is a simple count. The first question any reasonable person should ask is "Which one do I look at first?" The first question any manager is going to ask is, "What one number tells me about the whole application?" My answer to both, in a way, was "Maintainability Index." Why? Because each of the other numbers represent one element of quality while MI is a composite number that includes Cyclomatic Complexity. I'd be lying if I said no consideration was given to the fact that it was abstract enough that it's harder for some surly developer (I've been known to resemble that remark) to start arguing why a high coupling or inheritance is no big deal or how complex requirements are to blame for complex code. I should also note that I don't think there is one magic bullet metric that will tell you objectively how good a code base is. There are a ton of different metrics out there, and each one was created for a specific purpose in mind and has a pet theory behind it. When you've got a group of developers who aren't accustomed to measuring code quality, picking a 0-100 scale, non-controversial metric that can be easily generated by tools you already own really isn't a bad place to start. That sort of answers the question a developer would ask, but what about the management question; how do you dashboard this stuff when Visual Studio doesn't roll up the numbers to the solution level? Since VS does roll up the MI to the project level, I thought I could just figure out what sort of weighting Microsoft used to roll method scores up to the class level and then to the namespace and project levels. I was a bit surprised by the answer: there is no weighting. That means that a class with one 1300 line method (which will score a 0 MI) and one empty constructor (which will score a 100 MI) will have an overall MI of a respectable 50. Throw in a couple of DTOs that are nothing more than getters and setters (which tend to score 95 or better) and the project ends up looking really, really healthy. The next poor bastard who has to work on the application is probably not going to be singing the praises of its maintainability, though. For the record, that 1300 line method isn't a hypothetical, either. So, what does one do with that? Well, I decided to weight the average by the Lines of Code per method. For our above example, the formula for the class's MI becomes ((1300 * 0) + (1 * 100))/1301 = .077, rounded to 0. Sounds about right. Continue the pattern for namespace, project, solution, and even multi-solution application MI scores. This can be done relatively easily by using the "export to Excel" button and running a quick formula against the data. On the short list of follow-up questions would be, "How do I improve my application's score?" That's an answer for another time, though.

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• Trouble opening my router to my web server [closed]

  - by justin

  Here's the story. I have a webs server created and connected to my router. The website works great when I'm connected to the router, but when I'm off the network I can't access the website. I got the IP for my router by googling "what is my ip." I have opened ports 80 to 10080 to link to the server in the router. THe firewall is off. I can ping the router. One odd thing that I don't understand. When I am in network if I access XXX.XXX.XX.XX:80 I can access the web page no problem. If I access XXX.XXX.XX.XX:81 (or any other port) I get the error "Cannot access server." Any idea what the problem could be? Could it be my ISP?

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• Should I install Windows 7 on a 3 years old PC?

  - by Jitendra vyas

  This is my PC configuration, Should I upgrade my Windows XP to Windows 7. Currently I'm using Windows XP SP3 32 bit. Now will I get same performance or better performance or bad performance if I install Windows 7 on this system? Or would sticking with XP be better? Memory (RAM): 1472 MB DDR RAM (not DDR 2) CPU Info: AMD Sempron(tm) Processor 2500+ CPU Speed: 1398.7 MHz Sound card: Vinyl AC'97 Audio (WAVE) Display Adapters: VIA/S3G UniChrome Pro IGP | NetMeeting driver | RDPDD Chained DD Network Adapters: Bluetooth Device (Personal Area Network) | WAN (PPP/SLIP) Interface Hard Disks: 300 GB SATA HDD Manufacturer: Phoenix Technologies, LTD Product Make: MS-7142 AC Power Status: OnLine BIOS Info: AT/AT COMPATIBLE | 01/18/06 | VIAK8M - 42302e31 Motherboard: MICRO-STAR INTERNATIONAL CO., LTD MS-7142 Modem: ZTE USB Modem FFFE CDMA :

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• My IPSec VPN isn't allowing me to connect

  - by jbondhus

  I'm following this guide to create an IPsec VPN on a debian server. I followed all the steps, and it still isn't working. If I try connecting to it, I get an error. I've looked for the logs, but I'm not sure where they would be put, other than /var/logs. I aim to be able to browse the internet from my home connection, and access my home network as if it is my local network (eg. access my home fileserver and printers, and screen share my home computers remotely without a complicated port forwarding setup.

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• Windows SBS 2011 DNS Role (service) failing & needing restarting

  - by HaydnWVN

  Have a Windows SBS 2011 with Exchange that is handling all DNS for the network. Since getting a 3rd party (Hardware & Support) to setup a recieving FTP service and restricting Exchanges memory useage for another 3rd party product (Stock software) the local network seems to periodically 'lose the internet connection'. Delving deeper I found that the DNS service is somehow failing/stopping without the actual service on the server reporting such (nothing in event logs). A simple restart of the 'DNS Role' on the server solves the problem. The manager onsite reports that he has to do this most days in the afternoon - yet not at the same time and other days it works fine without a restart being required. I'm unable (lacking sufficient SBS2011 knowledge) to diagnose this further, ideally I would like the DNS Role to report (and log) the failure, then automatically restart itself.

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• Tips for debugging Samba performance?

  - by j-g-faustus

  Samba gives me 24 MB/s read and 44 MB/s write, while ftp gives 97 and 112 MB/s under the same circumstances. The documentation says that Generally, you should find that Samba performs similarly to ftp at raw transfer speed. In my case it clearly doesn't. Where can I find tips on how to debug Samba performance? Or alternatively tips for replacing Samba with something else? (I can't use ftp, unfortunately, as I need something that can be used with rsync/rsnapshot.) More details: Both computers are running Ubuntu 10.10 (using Samba because I have a Mac as well) The Samba share is on a local home network, mounted as $ mount ... //server.local/share/ on /mnt/share type cifs (rw,mand) Samba performance was tested by copying (cp) a single file of ~4GB to and from the share, using time for timing and calculating transfer speed by hand. ftp performance are the numbers from the ftp client for get/put of the same file. iperf gives network speed ~900 Mbits/s bonnie++ gives disk speeds 200 MB/s on both sides for block reads as well as block writes Tried changing the parameters suggested in the performance tuning HOWTO (read/write raw, read size, socket options), most of them made little to no difference. (The one that made a difference caused write speed to drop 50%.)

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• Is it possible to create a read-only user account for security auditing purposes?

  - by user2529583

  An organization requires several administrators to have a role of a security auditor. They must have read-only (via network/remote) access to Windows Server 2008 / R2 systems and have permissions to view the server configuration. They must not be able to make any other changes to the server or the network, like restarting or making any configuration chanages. However I can't find any built-in settings for a user like this. The closest thing is the "Users" user group [1], however from my understanding every user in the domain is in this group and cannot view the domain server's configuration. So, what are other options of implementing a read-only user account in Windows Server 2008? [1] http://technet.microsoft.com/en-us/library/cc771990.aspx

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• Case Study: Polystar Improves Telecom Networks Performance with Embedded MySQL

  - by Bertrand Matthelié

  Polystar delivers and supports systems that increase the quality, revenue and customer satisfaction of telecommunication services. Headquarted in Sweden, Polystar helps operators worldwide including Telia, Tele2, Telekom Malysia and T-Mobile to monitor their network performance and improve service levels. Challenges Deliver complete turnkey solutions to customers integrating a database ensuring high performance at scale, while being very easy to use, manage and optimize. Enable the implementation of distributed architectures including one database per server while maintaining a low Total Cost of Ownership (TCO). Avoid growing database complexity as the volume of mobile data to monitor and analyze drastically increases. Solution Evaluation of several databases and selection of MySQL based on its high performance, manageability, and low TCO. The MySQL databases implemented within the Polystar solutions handle on average 3,000 to 5,000 transactions per second. Up to 50 million records are inserted every day in each database. Typical installations include between 50 and 100 MySQL databases, up to 300 for the largest ones. Data is then periodically aggregated, with the original records being overwritten, as the need for detailed information becomes unnecessary to operators after a few weeks. The exponential growth in mobile data traffic driven by the proliferation of smartphones and usage of social media requires ever more powerful solutions to monitor, analyze and turn network data into actionable business intelligence. With MySQL, Polystar can deliver powerful, yet easy to manage, solutions to its customers. MySQL-based Polystar solutions enable operators to monitor, manage and improve the service levels of their telecom networks in over a dozen countries from a single location. The new and innovative MySQL features constantly delivered by Oracle help ensure Polystar that it will be able to meet its customer’s needs as they evolve. “MySQL has been a great embedded database choice for us. It delivers the high performance we need while remaining very easy to use, manage and tune. Power and simplicity at its best.” Mats Söderlindh, COO at Polystar.

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• Server Fault Wiki: How does Subnetting Work?

  - by Kyle Brandt

  How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? Not looking for links to other sites (unless maybe you have one post with a bunch of good ones). I already know how to subnet, I just thought it would be nice if Server Fault had a generic subnetting answer.

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• CentOS 6.5 proxy bypass/no_proxy not working

  - by Naruto Uzumaki

  I am running CentOS 6.5 on my desktop. I've set the Network Proxy using the network proxy application provided under Preferences. I've also set the following exceptions: localhost,127.0.0.0/8,172.16.0.0/12,192.168.0.0./16 But whenever I am using wget (I'm testing the proxy settings using using wget) then wget tries to connect to the proxy for private addresses, but wget localhost works fine and doesn't use the proxy. I also removed all the proxy settings and set the proxy in the shell: export http_proxy="<proxy_url>:<port>" export https_proxy="<proxy_url>:<port>" export no_proxy="localhost,127.0.0.0/8,172.16.0.0/12,192.168.0.0./16" It work when I use the command wget <external_url> or wget localhost but fails when I use the command wget <private address from the $no_proxy variable>. I also tried setting the variables in Ubuntu 14.04 also and facing the same issue. Regards,

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• Connecting Windows XP to Windows 7 directly using cable

  - by TPR

  These are the problems I am encountering. XP can access Windows 7, not the other way around (which is fine, because I don't need it the other way currently) File transfer is too slow like 0.031 MB/s even though netperf and netCPS list around 8-9 MB/s. I disabled firewall on both computers. Both are same workgroup. I left homegroup on Windows 7. Windows 7 sees the connection as unidentified network. 10.1.1.2 (XP) and 10.1.1.1 (Windows 7) Subnet mask 255.255.255.0 Default gateway and DNS are empty for both of them. Both computer are connected to internet using wireless (using home network), and both of them are connected to each other using wire! If anybody has any pointers, do let me know. I have no problem doing such setup with both computers being Windows 7. This time one of them is XP though, and that seems to be the problem.

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• Run application or script on Windows RDC connection

  - by NickLarsen

  I checked this thread, but it did not solve my exact problem. I need to run a script on when a connection is made across my network using windows remote desktop connection. The thread listed above works for the initial login, however, if I don't log out (which is necessary for some processes running on my network), then it wont run the script again the next time someone connects to the system using remote desktop connection. Previously we were using pcAnywhere to achieve this, however after running into some graphical issues with pcAnywhere, we have decided to move away from it to RDC. For a little more information, we need to have an email sent out anytime a connection is made to particular machines. The login name will always be the same for those systems and we do not log off when closing the connection.

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• What is Causing this IIS 7 Web Service Sporadic Connectivity Error?

  - by dpalau

  On sporadic occasions we receive the following error when attempting to call an .asmx web service from a .Net client application: "The underlying connection was closed: A connection that was expected to be kept alive was closed by the server. Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host." By sporadic I mean that it might occur zero, once every few days, or a half-dozen times a day for some users. It will never occur for the first web service call of a user. And the subsequent (usually the same) call will always work immediately after the failure. The failures happen across a variety of methods in the service and usually happens between 15-20 seconds (according to the log) from the time of the request. Looking in the IIS site log for the particular call will show one or the other of the following windows error codes: 121: The semaphore timeout period has elapsed. 1236: The network connection was aborted by the local system. Some additional environment details: Running on internal network web farm consisting of two servers running IIS7 on Windows Server 2008 OS. These problems did not occur when running in an older IIS6 web farm of three servers running on Windows Server 2003 (and we use a single IIS6/2003 instance for our development and staging environments with no issues). EDIT: Also, all of these server instances are VMWare virtual machines, not sure if that is a surprise anymore or not. The web service is a .Net 2.0/3.5 compiled .asmx web service that has its own application pool (.Net 2.0, integrated pipeline). Only has Windows Authentication enabled. We have another web service on the farm that uses the same physical path as the primary service, the only difference being that Basic Authentication is enabled. This is used for a portion of our ERP system. Have tried using the same and different application pool - no effect on the error. This site isn't hit as often as the primary site and has never had an error. As mentioned, the error will only happen when called from the .Net client - not from other applications. The client application is always creating a new web service object for each request and setting the service credentials to System.Net.CredentialCache.DefaultCredentials. The application is either deployed locally to a client or run in a Citrix server session. Those users running in Citrix doesn't seem to experience the issue, only locally deployed clients. The Citrix servers and the web farm are located in the same physical location and are located in the same IP range (10.67.xx.xx). Locally deployed clients experiencing the error are located elsewhere (10.105.xx.xx, 10.31.xx.xx). I've checked the OS logs to see if I can see any problems but nothing really sticks out. EDIT: Actually, I myself just ran into the error a little bit ago. I decided to check out the logs again and saw that there was a Security log entry of "Audit Failure" at the 'same' time (IIS log entry at 1:39:59, event log entry at 1:39:50). Not sure if this is a coincidence or not, I'll have to check out the logs of previous errors. I'm probably grasping for straws but the details: Log Name: Security Source: Microsoft-Windows-Security-Auditing Date: 7/8/2009 1:39:50 PM Event ID: 5159 Task Category: Filtering Platform Connection Level: Information Keywords: Audit Failure User: N/A Computer: is071019.<**.net Description: The Windows Filtering Platform has blocked a bind to a local port. Application Information: Process ID: 1260 Application Name: \device\harddiskvolume1\windows\system32\svchost.exe Network Information: Source Address: 0.0.0.0 Source Port: 54802 Protocol: 17 Filter Information: Filter Run-Time ID: 0 Layer Name: Resource Assignment Layer Run-Time ID: 36 I've also tried to use Failed Request Tracing in IIS7 but the service call never actually gets to where FRT can capture it (even though the failure is logged in the web service log). The network infrastructure group said they checked out the DNS and any NIC settings are correct so there is no 'flapping'. Everything pans out. I'm not sure that they checked out any domain controller servers though to see if that could be an issue. Any ideas? Or any other debugging strategies to get to the bottom of this? I'm just the developer in charge of the software and don't really have the knowledge on what to investigate from the networking side of things - although it does sound like a networking issue to me based on what is happening. Thanks in advance for any help.

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• Find DNS server automatically

  - by jdickson

  I've got a Windows 2012 server set up as a domain controller and DNS server in my basement. On my laptop, if I set it to use the IP address of my server as the DNS server, then it works as expected. The problem with that is that I use my laptop outside my home network and I need to switch it back to automatic. Setup is like this: ISP Router running DD-WRT Win 2012 DC/DNS and other network computers How can I have my laptop find the DNS server automatically instead of using my ISP's DNS servers?

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