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• How to push configurations to multiple Cisco Switches

  - by nixda

  Assume I have around 50 Cisco IE2000 Switches connected together and I want to reconfigure some settings, the same settings for every switch. Normally I would open a command line session via Putty and paste the commands. But as the number of switches is growing, even this method takes its time. I am aware of Kiwi CatTools. Unfortunately it's not free so I'm wondering if there are other efficient ways to configure a large number of Cisco switches.

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• Duplicate IP address detection with multiple NICs

  - by sfink

  I am using arping -D to detect duplicate IP addresses within a network when setting up servers. (The network is controlled by someone else, and we have had many issues with IP allocation in the past.) It works fine as long as my host has a single NIC on a given VLAN, but when my host has more than one (I have one with 9 NICs on one VLAN and 1 on the other), arping -D always returns false collisions. The problem is that all 9 of my NICs respond to an ARP request for any of the IPs on those NICs. (These are real physical NICs, not aliases or anything.) I send out one ARP request packet, and get 9 ARP is-at ARP replies, one for each MAC address. I could implement my own solution by sniffing packets and checking for any replies with a MAC address other than the local NICs', but it seems like there ought to be an easier way.

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• HP Procurve Issue Passing Multiple VLANs over a link

  - by MichaelRwat

  Just to start off with I am a Cisco guy that got placed into an HP project. Basic topology overview from outside in: ASA 5505 with two Ethernet connections to a 2910-24 port switch. This switch is then (Cisco Trunking) to a 2626 switch passing vlan (1 untagged and 100 tagged)between them. I created SVI's on each of the switches for both VLAN's for testing purposes. I can not get vlan 100 to pass across this link. I also have trunks configured to AP's off of the switch and can not ping the vlan 100 BVI on the AP's but can reach the vlan 1 BVI. Port 25 on Access layer (2626) connects (trunks) with port A1 of 2610. STP is not running at all on any switch (this is not my network I can't change this nor did I design this) Distribution Sw: MP1-0# show run ip default-gateway 10.100.100.100 vlan 1 name "DATA" untagged 1-22,24-A1,B1 ip address 10.100.100.6 255.255.255.0 no untagged 23 exit vlan 100 name "GUEST" untagged 23 tagged 24-A1 ip address 10.100.102.6 255.255.255.0 exit Access Sw: ip default-gateway 10.100.100.100 vlan 1 name "DEFAULT_VLAN" untagged 1-26 ip address 10.100.100.5 255.255.255.0 exit vlan 100 name "GUEST" ip address 10.100.102.5 255.255.255.0 tagged 15,25 exitt From the ASA I can ping the vlan 100 address of the 2610 but not the 2626 (10.100.102.6)[Not passing the "trunk"] If I plug into an access port vlan 100 of the 2626 I can ping the SVI for vlan 100 as intended. I can not ping across the "trunk" over vlan 100 but I can across vlan 1. There may be something obvious I'm missing but please review my configuration and thank you for the assistance.

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• multiple php compiler on single apache installation

  - by getmizanur

  elloo, i have some old php scripts which runs on php-5.2.x and the current server has php-5.3.x. to get around this problem,i have got two options one is to downgrade php-5.3.x or install php-5.2.x and php-5.3.x at the same time where php-5.2.x serve cgi script. i have decided go for the second option i have followed this tutorial and i can get most of it working however except execution of shell script which selects php-cgi version. i cannot get apache to execute this script. how do i get apache to execute #!/bin/sh # you can change the PHP version here. version="5.2.6" # php.ini file location, */php-5.2.6/lib equals */php-5.2.6/lib/php.ini. PHPRC=/etc/php/phpfarm/inst/php-${version}/lib/php.ini export PHPRC PHP_FCGI_CHILDREN=3 export PHP_FCGI_CHILDREN PHP_FCGI_MAX_REQUESTS=5000 export PHP_FCGI_MAX_REQUESTS # which php-cgi binary to execute exec /etc/php/phpfarm/inst/php-${version}/bin/php-cgi my apache vhost.conf <VirtualHost *:80> ServerName 526.localhost DocumentRoot /home/getmizanur/public_html/www <Directory "/home/getmizanur/public_html/www"> AddHandler php-cgi .php Action php-cgi /php-fcgi/php-cgi-5.2.6 </Directory> </VirtualHost> can some one tell me what am i doing wrong? thanks in advance. solution: if i did a2dismod php5 then the above configuration worked. when a2enmod php5 had been activated, apache was executing php5.3 instead of php5.2 even after telling apache to execute php5.2 shell script. to solve my problem, i had to change my virtualhost configuration <VirtualHost *:80> ServerName 526.localhost DocumentRoot /home/getmizanur/public_html/www DirectoryIndex index.php <Directory "/home/getmizanur/public_html/www"> AddHandler php-cgi .php Action php-cgi /php-fcgi/php-cgi-5.2.6 <FilesMatch "\.php"> SetHandler php-cgi </FilesMatch> </Directory> </VirtualHost> presto, it started working.

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• Daisy-chaining network switches with multiple cables

  - by user72153

  This might just be the dumbest question you'll ever read, but I digress. Say I have two 100Mbps Ethernet switches with 2 computers on each, connected together by a single cable. This way, the two PCs on each switch share the 100Mbps bandwidth with the others. If I added another cable between the 2 switches, would there be 200Mbps throughput available between the switches? Or am I completely off my rocker? Thanks for the help.

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• multiple wildcard entries

  - by Murali

  my client has around 300,000 domains and they just have a wildcard for all of them * A 12.12.12.12 Now they want to create a sub domain that points to a different IP and still have the flexibility of wildcard, something like ww1.* A 24.24.24.24 * A 12.12.12.12 Looks like in BIND, the lower "*" is catch-all and taking over every query and hence ww1 is not working. One of solutions offered by IT folks was to create seperate 300K zones for just "ww1" and leave the "*" wildcard. Are there any other DNS software's that can achieve this task easily? Any other ways to deal?

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• Gnu/Linux package manager, multiple versions, no root privilege

  - by user744629

  I'm looking for a Gnu/Linux package manager, that can help to package, distribute, install sofware (actually scientific libraries), like this: do not required root privilege, for example, install in $HOME/opt or $HOME/local manage muliple version of a library, for example, with this directories organisation: $HOME/opt/somelib/4.2.1/lib/ $HOME/opt/somelib/4.2.1/include/ $HOME/opt/somelib/4.2.1/bin/ $HOME/opt/somelib/4.2.2/lib/ $HOME/opt/somelib/4.2.2/include/ $HOME/opt/somelib/4.2.2/bin/ $HOME/opt/anotherlib/1.0.0/lib/ $HOME/opt/anotherlib/1.0.0/include/ $HOME/opt/anotherlib/1.0.0/bin/ package contains source files, not binaries, build is performed during install. support for Mac OS X too would be good. Then it's up to the user to manage it's LD_LIBRARY_PATH, or compile with -L/good/path etc. Does it exists?

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• How to host multiple mail domains with courier?

  - by Dave Vogt

  I had my server set up with generic aliases in /etc/courier/aliases/users, which worked fine. But today I wanted to host some new domains, where addresses overlap. What I need is that [email protected] goes to account "dv", but [email protected] goes to account "d2". So I set up a new file containing fully qualified addresses ([email protected]: dv) instead of the previous dave: dv. But somehow, courier-smtpd doesn't accept mail to these addresses anymore. makealiases -dump prints all the aliases the way they should be.. so i'm a bit stuck.

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• Apache doesn't run multiple requests

  - by Reinderien

  I'm currently running this simple Python CGI script to test rudimentary IPC: #!/usr/bin/python -u import cgi, errno, fcntl, os, os.path, sys, time print("""Content-Type: text/html; charset=utf-8 <!doctype html> <html lang="en"> <head> <meta charset="utf-8" /> <title>IPC test</title> </head> <body> """) ftempname = '/tmp/ipc-messages' master = not os.path.exists(ftempname) if master: fmode = 'w' else: fmode = 'r' print('<p>Opening file</p>') sys.stdout.flush() ftemp = open(ftempname, fmode) print('<p>File opened</p>') if master: print('<p>Operating as master</p>') sys.stdout.flush() for i in range(10): print('<p>' + str(i) + '</p>') sys.stdout.flush() time.sleep(1) ftemp.close() os.remove(ftempname) else: print('<p>Operating as a slave</p>') ftemp.close() print(""" </body> </html>""") The 'server-push' portion works; that is, for the first request, I do see piecewise updates. However, while the first request is being serviced, subsequent requests are not started, only to be started after the first request has finished. Any ideas on why, and how to fix it? Edit: I see the same non-concurrent behaviour with vanilla PHP, running this: <!doctype html> <html lang="en"> <!-- $Id: $--> <head> <meta charset="utf-8" /> <title>IPC test</title> </head> <body> <p> <?php function echofl($str) { echo $str . "</b>\n"; ob_flush(); flush(); } define('tempfn', '/tmp/emailsync'); if (file_exists(tempfn)) $perms = 'r+'; else $perms = 'w'; assert($fsync = fopen(tempfn, $perms)); assert(chmod(tempfn, 0600)); if (!flock($fsync, LOCK_EX | LOCK_NB, $wouldblock)) { assert($wouldblock); $master = false; } else $master = true; if ($master) { echofl('Running as master.'); assert(fwrite($fsync, 'content') != false); assert(sleep(5) == 0); assert(flock($fsync, LOCK_UN)); } else { echofl('Running as slave.'); echofl(fgets($fsync)); } assert(fclose($fsync)); echofl('Done.'); ?> </p> </body> </html>

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• Windows file locks allowing multiple users to write to open file over network

  - by JPbuntu

  I have 6 windows computers (xp,vista,7) that need to access a samba share (Ubuntu 12.04). I am trying to make it so only one client can open a file at a given time. I thought this was pretty standard behavior of file locks, but I can't get it to work. The way it is right now a file can be open by two users, and changed and saved by either one of them. The last file saved overwrites what ever changes the other user made. At first I thought this was a Samba configuration problem, but I get this behavior even between two windows machines. So far I have only tested: Windows Xp Windows Vista Windows XP Samba << Windows Vista and both give the same behavior. When I tested the Samba configuration, I had set strict locking = yes and get errors logged like this: close_remove_share_mode: Could not get share mode lock for file _prod/part_number_list_COPY.xlsx Eventually all of the files are going to be moved onto the Samba share, so that is the configuration I am most concerned about fixing. Any ideas? Thanks in advance. EDIT: I tested an excel file again, and it is now working properly in both above mentioned cases, I am also no longer getting the above mentioned error. I don't know what happened, perhaps a restart fixed it? (also works with strict locking = no) Although I still need to find a solution for the CAD/CAM files we use, the software is Vector and it does not seem to be using file locks. Is there any software that I can use to manage these files, so two people can't open/edit them at a time? Maybe a windows application that forces file locks? Or a dirt simple version control system? (the only ones I have seen at are too complicated for our needs).

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• how to run multiple shell scripts in parallel

  - by tom smith

  I've got a few test scripts, each of which runs a test php app. Each script runs forever. So, cat.sh, dog.sh, and foo.sh, each run a php script, and each shell script runs the php app in a loop, so it runs forever, sleeping after each run. I'm trying to figure out how to run the scripts in parallel, and at the same time, see the output of the php apps in the stdout/term window. I thought, simply doing something like foo.sh > &2 dog.sh > &2 cat.sh > &2 in a shell script would be sufficient, but it's not working. foo.sh, runs foo.php once, and it runs correctly dog.sh, runs dog.php in a never ending loop. it runs as expected cat.sh, runs cat.php in a never ending loop *** this never runs!!! it appears that the shell script never gets to run cat.sh. if i run cat.sh by itself in a separate window/term, it runs as expected... thoughts/comments

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• Running multiple services on Port 443, Tunnel SSH over HTTPS

  - by lajuette

  Situation: I want to tunnel SSH sessions through HTTPS. I have a very restrictive firewall/proxy which only allows HTTP, FTP and HTTPS traffic. What works: Setting up a tunnel through the proxy to a remote linux box that has a sshd listening at port 443 The problem: I have to have a web server (lighty) running at port 443. HTTPS traffic to other ports is forbidden by the proxy. Ideas so far: Set up a virtual host and proxy all incoming requests to localhost: (e.g. 22) $HTTP["host"] == "tunnel.mylinux.box" { proxy.server = ( "" => (("host" => "127.0.0.1", "port" => 22)) ) } Unfortunately this won't work. Am i doing something wrong, or is there a reason, that this won't work?

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• multiple folder structures/views

  - by Sojourner

  Newbie. Setting up a server for a law firm. Want to set up the folder structure as follows: Client 1 Name -- Matter 1 (i.e. setting up corporation) -- Matter 2 (i.e. divorce) -- Matter 3 (i.e. setting up trust) Client 2 Name -- Matter 1 Client 3 Name -- Matter 1 and so on. But the attorneys prefer navigating a folder structure, more based on what case type: Civil -- Client 1 Name (i.e. Smythe) -- Client 2 Name (i.e. Jones) -- Client 3 Name (i.e. Johson) -- Landlord/Tenant -- Client 1 Name (i.e. Jones) -- Client 2 Name (i.e. Johson) -- Class Action Suits -- Suit 1 -- Suit 2 Personal Injury -- Client 1 Name -- Client 2 Name -- Client 3 Name Criminal -- Client 1 Name (i.e. Smythe) I'd like to know if it's possible to set up the server with the first folder structure (it's more organized and easier to employ scripts), while having the second folder structure available for users who find it easier to deal with the same types of cases grouped together.

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• Multiple home routers

  - by netvope

  Suppose I have the following configuration: Router A: WAN port connected to the Internet, LAN = 192.168.1.0/24 Computer A: Connected to router A as 192.168.1.101 Router B: WAN port connected to router A as 192.168.1.102, LAN = 192.168.2.0/24 Computer B: Connected to router B as 192.168.2.101 Now I want computer A to communicate with computer B seamlessly (e.g. can establish a TCP connection by running nc 192.168.2.101 <port>) by means of routing, rather than merging the two networks into one (which can be easily accomplished using router B as a switch). Most routers are shipped with NAT turned on, of which I definitely need to turn off in router B. But what other steps do I need to take so that packets from computer A to computer B would go through router B? I could manually add a routing table entry in computer A so that all packets targeted to 192.168.2.0/24 go through gateway 192.168.1.102, but I would prefer an automatic way if it exist.

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• Multiple home routers

  - by netvope

  Suppose I have the following configuration: Router A: WAN port connected to the Internet, LAN = 192.168.1.0/24 Computer A: Connected to router A as 192.168.1.101 Router B: WAN port connected to router A as 192.168.1.102, LAN = 192.168.2.0/24 Computer B: Connected to router B as 192.168.2.101 Now I want computer A to communicate with computer B seamlessly (e.g. can establish a TCP connection by running nc 192.168.2.101 <port>) by means of routing, rather than merging the two networks into one (which can be easily accomplished using router B as a switch). Most routers are shipped with NAT turned on, of which I definitely need to turn off in router B. But what other steps do I need to take so that packets from computer A to computer B would go through router B? I could manually add a routing table entry in computer A so that all packets targeted to 192.168.2.0/24 go through gateway 192.168.1.102, but I would prefer an automatic way if it exist.

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• Multiple subnets on isc-dhcp-server using ddns with bind9

  - by legioxi

  On my network I have two subnets: 10.100.1.0/24 - Wired/wireless 10.100.7.0/24 - VPN Both subnets are served by isc-dhcp-server running on a Debian VM. This same VM runs bind9 for my DNS. ISC-DHCP-SERVER is configured to use DDNS and update BIND9 with hosts/IPs. Everything runs great until a device drops off the wired/wireless network and pops onto the VPN. When connecting on the VPN, a DHCP lease is handed out on the new subnet but DDNS does not update BIND9. Since the device has A/TXT/PTR records it appears ISC-DHCP-SERVER won't switch them to the new IP. The logs show: Connect to wireless: Nov 6 20:55:13 core-server named[2417]: client 127.0.0.1#57697: updating zone 'internal.mydomain.com/IN': adding an RR at 'demo-iphone.internal.mydomain.com' A Nov 6 20:55:13 core-server named[2417]: client 127.0.0.1#57697: updating zone 'internal.mydomain.com/IN': adding an RR at 'demo-iphone.internal.mydomain.com' TXT Nov 6 20:55:13 core-server dhcpd: DHCPACK on 10.100.1.160 to FF:FF:FF:FF:FF:FF (demo-iphone) via eth0 Nov 6 20:55:13 core-server dhcpd: Added new forward map from demo-iphone.internal.mydomain.com to 10.100.1.160 Nov 6 20:55:13 core-server dhcpd: Added reverse map from 160.49.21.172.in-addr.arpa. to demo-iphone.internal.mydomain.com Switch to VPN: Nov 6 20:56:34 core-server dhcpd: DHCPOFFER on 10.100.7.101 to BB:BB:BB:BB:BB:BB (demo-iphone) via 10.100.7.0 Nov 6 20:56:34 core-server named[2417]: client 127.0.0.1#57697: updating zone 'internal.mydomain.com/IN': update unsuccessful: demo-iphone.internal.mydomain.com: 'name not in use' prerequisite not satisfied (YXDOMAIN) Nov 6 20:56:34 core-server dhcpd: DHCPREQUEST for 10.100.7.101 (10.100.1.2) from BB:BB:BB:BB:BB:BB (demo-iphone) via 10.100.7.0 Nov 6 20:56:34 core-server dhcpd: DHCPACK on 10.100.7.101 to BB:BB:BB:BB:BB:BB (demo-iphone) via 10.100.7.0 Nov 6 20:56:34 core-server named[2417]: client 127.0.0.1#57697: updating zone 'internal.mydomain.com/IN': update unsuccessful: demo-iphone.internal.mydomain.com/TXT: 'RRset exists (value dependent)' prerequisite not satisfied (NXRRSET) Nov 6 20:56:34 core-server dhcpd: Forward map from demo-iphone.internal.mydomain.com to 10.100.7.101 FAILED: Has an address record but no DHCID, not mine. One thing to note is that the MAC of the device when connecting via VPN is the MAC of my Cisco ASA5512X and not the actual device. The ASA is relaying the DHCP request from the VPN client to the VM running ISC-DHCP-SERVER. Is there a way to get DDNS working in this scenario?

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• windows server 2008r2 with terminal services in multiple networks with different users

  - by phhe

  is there a way to let terminal services make some kind of 'abstraction' over the physical network interfaces of the server so they can be managed via gpo to grant or prohibit access for different users? the basic idea is to have 2 network interfaces (user and server/management) and not letting users within terminal sessions access the server/management network. or is this just impossible ? what would be a better way to do this ?

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• Mod_Perl configuration for multiple domains

  - by daliaessam

  Reading the Mod_Perl module documentation, can we configure it on per domain basis, what I mean can we configure it to run on every domain or specific domain only. What I see in the docs is: Registry Scripts To enable registry scripts add to httpd.conf: Alias /perl/ /home/httpd/2.0/perl/ <Location /perl/> SetHandler perl-script PerlResponseHandler ModPerl::Registry PerlOptions +ParseHeaders Options +ExecCGI </Location> and now assuming that we have the following script: #!/usr/bin/perl print "Content-type: text/plain\n\n"; print "mod_perl 2.0 rocks!\n"; saved in /home/httpd/httpd-2.0/perl/rock.pl. Make the script executable and readable by everybody: % chmod a+rx /home/httpd/httpd-2.0/perl/rock.pl Of course the path to the script should be readable by the server too. In the real world you probably want to have a tighter permissions, but for the purpose of testing, that things are working, this is just fine. From what I understand above, we can run Perl scripts only from one specific folder that we put the directive above. So the question again, can we make this directive per domain for all domains or for specific number of domains?

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• Apache httpd.conf handle multiple domains to run the same application

  - by John Stewart

  So what we are looking for is the ability to do the following: We have an application that can load certain settings based on the domain that it is being accessed from. So if you come from xyz.com we show a different logo and if you come from abc.com we show a different logo. The code is the same, running from same server just detects the domain on the run Now we want to get a dedicated server (any suggestions?) that will enable us to point all the doamins that we want to this server (we change the DNS for the domains to that of our server) and then when the user goes to a certain domain they run the same application. Now as far as I can understand we will need to create a "VirtualHost" in apache to handle this. Can we create a wildcard virtualhost that catches all the domains? I am not an expert with Apache at all. So please forgive if this comes out to be a silly question. Any detailed help would be great. Thanks

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• Global Address List, Multiple All Address Lists in CN=Address Lists Container

  - by Jonathan

  When my colleges (that was way before my time here) updated Exchange 2000 to 2003 a English All Address Lists appeared in addition to the German variant. The English All Address Lists have German titled GAL below it. This has just been a cosmetic problem for the last few years. Now as we are in the process of rolling out Exchange 2010 this causes some issues. Exchange 2010 picked the wrong i.e. English Address Lists Container to use. In ADSI Editor we see CN=All Address Lists,CN=Address Lists Container,CN=exchange org,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain and CN=Alle Adresslisten,CN=Address Lists Container,CN=exchange org,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain. In the addressBookRoots attribute of CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain both address lists were stored as values. We removed the English variant from addressBookRoots and restarted all (old and new) Exchange servers. User with mailboxes on the Exchange 2003 now only sees the German variant. Exchange 2010 is still stuck with the English/Mixed variant as are Users on Exchange 2010. Our goal would be to have Outlook display the German title of All Address Lists and get rid of the wrong Address Lists Container.

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• Make flash drive bootable with MULTIPLE Windows Installers

  - by alexander7567

  I have seen many ways to make a USB an installer for about any Windows OS. But how can I (using grub or something like that) make it bootable to all editions on Windows XP and 7? I have tried Googling it and researching, I've even tried to do it, But I dont understand much about GRUB or linux at all. Please keep in mind that I am not very good with linux, so please use as many details as possible.

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• Exchange 2010, multiple accepted domains, UCC and outside webhosts

  - by westbadger

  We have an Exchange 2010 server configured to send and receive mail on several accepted domains for Outlook Anywhere, with a UCC cert addressing each mail.domain.com and autodiscover.domain.com, mail.otherplace.com etc. This worked fine until an SSL domain validation cert for one of the additional domains - where the www.otherplace.com is hosted outside our org - expired. Now Exchange users in mail.otherplace.com get an expired cert warning for otherplace.com when connecting to our mail.domain.com portal. They still get mail, but with a repeated popup in Outlook 2007 and 2010. If I understand it correctly - Outlook autodiscover connects by first polling otherplace.com/autodiscover - which is the outside www server with the expired cert before continuing on to autodiscover.otherplace.com - which is where the MX record points to our in-house Exchange UCC. I'm trying to find out if we should: 1) turn down all mail functions on the outside webserver 2) delete the expired (useless for an informational site) cert on the outside webserver 3) renew the cert for otherplace.com on the outside webserver - or something completely different? Many thanks in advance for your thoughts.

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• Excel how to get an average for column for rows that meet multiple criteria

  - by Jess

  I would like to know the average days between open and close dates for an item with a close date in a particular month. So from the below example in Jan 2013 items 2,5 and 6 were closed (Closed can be RESOLVED or CANCELLED status), each were open for 26, 9 and 6 days respectivly. So of the jobs that have a closed date in Jan 2013 (between 01/01/2013 and 13/02/13) they have an average open time (between open and close date) of 13.67 days to 2dp. I have tried a few ways to get this to work and i think the issue I am having is with the AVERAGE function. First time using a forum so apologies if my question is unclear. Was unable to post image to have this comma seperated below Item_ID,Open_Date,Status,Close_Date 1,1/06/2012,RESOLVED,16/07/2012 2,20/12/2012,RESOLVED,16/01/2013 3,2/01/2013,IN PROGRESS, 4,3/01/2013,CANCELLED,7/05/2013 5,3/01/2013,RESOLVED,12/01/2013 6,4/01/2013,RESOLVED,10/01/2013 7,1/02/2013,RESOLVED,15/02/2013 8,2/02/2013,OPEN, 9,7/02/2013,CANCELLED,26/02/2013

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• Make Apache to listen in multiple IPs

  - by Enrique Becerra

  Hi I'm in a big LAN, which is behind a proxy/firewall I'm working with an apache/php/mysql application, which is hosted in a small server besides my workstation. This server is connected to the LAN also and is behind the proxy: The server has a local IP assigned: 10.64.x.x Also, this server has a public IP assigned (or redirected from within the proxy/firewall) which is: 200.41.x.x I can't access public IP from LAN, but I can ping to the public IP from outside the building How should I configure Apache to listen also for public IP and open the 80 port for people accessing from outside the building?. It is set now to Listen 10.64.x.x:80 Thanks a lot in advance,

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• Rails/Mongo across multiple different geo-regions

  - by wmarbut

  I have a system that by necessity requires physical presence in three or more different locations and I need advice on structuring in such a way that my database stays replicated in a timely manner without horrible latency. I've seen mysql access and replication be incredibly slow when the application server was trying to talk to a node that wasn't physically collocated. In this case I am using mongodb. The stack is linux/passenger/ruby/rails/mongodb. The database is write heavy and read light. The infrastructure is Amazon EC2 The application layer must be physically located in 3 or more different locations. I can't justify this requirement further than it is a requirement. The database, however needn't be located in more than one location if it can be written to quickly from other locations. From reading mongo's documentation, mongo replication seems like more of a candidate than sharding b/c my datastore is not huge. However I don't see anything that addresses the issue of speed for servers communicating across large distances with potentially high latency.

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