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• Do I need to restart my server after editing fstab and mtab?

  - by jaypabs

  I'm just wondering if I need to restart my server after editing fstab and mtab. I changed something in this file manually due to problem with awstats report. I am using ISPConfig 3 with the help of the tutorial from howtoforge. But due to removing/deleting of some account, the configuration of fstab and mtab messed up. I also ask this question at howtoforge forum but until now no one has answered. If you'd like to read my question please visit it here. I tried very hard to fix the problem w/o luck. Update: Here's what happen to my fstab: Before the value was (I omitted the other): /var/log/ispconfig/httpd/mydomain.com /var/www/clients/client1/web1/log none bind,nobootwait 0 0 /var/log/ispconfig/httpd/example.com /var/www/clients/client1/web2/log none bind,nobootwait 0 0 So I changed it to the correct path: /var/log/ispconfig/httpd/mydomain.com /var/www/clients/client1/web2/log none bind,nobootwait 0 0 /var/log/ispconfig/httpd/example.com /var/www/clients/client1/web3/log none bind,nobootwait 0 0 I also found mtab to have the same value as above that's why I edited it manually. from: /var/log/ispconfig/httpd/mydomain.com /var/www/clients/client1/web1/log none rw,bind 0 0 /var/log/ispconfig/httpd/example.com /var/www/clients/client1/web2/log none rw,bind 0 0 to: /var/log/ispconfig/httpd/mydomain.com /var/www/clients/client1/web2/log none rw,bind 0 0 /var/log/ispconfig/httpd/example.com /var/www/clients/client1/web3/log none rw,bind 0 0 I edited those value because the correct path of mydomain.com and example.com should be under web2 and web3 folder respectively. As of now the log of example.com is pointed to: /var/www/clients/client1/web2/log when it should be: /var/www/clients/client1/web3/log So I am thinking that this is because of fstab and mtab. Please guide me how to point the log correctly to it's default directory. I explain the scenario one by one at this link. to dawud: Based on your example mount -o remount,noexec /var, should I run mount -o remount,noexec /var/log/ispconfig/httpd/example.com?

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• How do I setup routing for 2 companies with different Internet connections on the same LAN?

  - by Clint Miller

  Here's the setup: 2 companies (A & B) share office space and a LAN. A 2nd ISP is brought in and company A wants it's own Internet connection (ISP A) and company B wants it's own Internet connection (ISP B). VLANs are deployed internally to separate the 2 company's networks (company A: VLAN 1, company B: VLAN 2, shared VOIP: VLAN 3). With separate VLANs it's simple enough to use separate DHCP servers (or separate scopes on the same server) to assign the default gateway to each company's gateway for their Internet connection. Static routes can be created on each gateway to point traffic destined for the other company's VLAN or the voice VLAN so that all nodes are reachable as expected. However, I think this is a form of asymmetrical routing, right? (The path from node A1 to node B1 is not the same as the path back from node B1 to node A1). Can I setup policy-based routing to correct this? In that case, can I assign the same default gateway to every device on all VLANs and create a routing policy on a L3 switch to look at the source address and forward traffic to the appropriate next hop? In that case, I want the routing logic to go like this: If the destination address is known, forward the traffic (traffic destined for a different VLAN). If the destination address is unknown, forward the traffic to ISP A's gateway if the source address is on VLAN A; or forward the traffic to ISP B's gateway if the source address is VLAN B. Am I thinking about this problem in the correct way? Is there another way to solve this problem that I am overlooking?

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• Would an invalid certificate cause an 0x8004010F sync error?

  - by hydroparadise

  We just migrated from Exchange 2003 to 2007 which was a combo primary AD/DNS server and it has not gone smoothly. We are now down to getting a new certificate (a bureaucratic process thats out of my hands) and users getting the 0x8004010F sync issue. We are only using Outlook 2007 as our email client and the sync error appears exactly as so: 9:21:44 Synchronizer Version 12.0.6562 9:21:44 Synchronizing Mailbox '<User>' 9:21:44 Done 9:21:44 Microsoft Exchange offline address book 9:21:44 0X8004010F Now, I have read a number of technet articles on this issue anywhere from adding an A record in the DNS for autodiscover.domain.com to syncing the old OAD to the new OAD. In otherwords, theres lots of thing to try, but trial and error at this point might be hazardous to ther server's health and I am trying to narrow down the list of things to try. What has me thinking that the sync error could be related to the certificate is an event error message that says the following: Microsoft Exchange could not find a certificate that contains the domain name mail.ccufl.org in the personal store on the local computer. Therefore, it is unable to support the STARTTLS SMTP verb for the connector Internet Mail with a FQDN parameter of mail.ccufl.org. If the connector's FQDN is not specified, the computer's FQDN is used. Verify the connector configuration and the installed certificates to make sure that there is a certificate with a domain name for that FQDN. If this certificate exists, run Enable-ExchangeCertificate -Services SMTP to make sure that the Microsoft Exchange Transport service has access to the certificate key. I am not fully clear on how the Exchange Transport Service is related to Syncronization, but my hunch is that it probably not related to there not being a valid certificate. So to recap, would an invalid certificate cause an 0x8004010F sync error?

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• dovecot/postfix: can send & receive via webmin, however squirrel mail and outlook fail to connect

  - by Jonathan

  I have just finished setting up dovecot and postfix on my server (centos 5.5/apache) earlier today. So far I've been able to get email working through webmin (can send/receive to and from external domains). However, attempting to telnet xxx.xxx.xx.xxx 110 returns the following errors: Connected to xxx.xxx.xx.xxx. Escape character is '^]'. +OK Dovecot ready. USER mailtest +OK PASS ********* +OK Logged in. -ERR [IN-USE] Couldn't open INBOX: Internal error occurred. Refer to server log for more information. [2011-02-11 22:55:48] Connection closed by foreign host. Which further logs the following error dovecot: Feb 11 21:32:48 Info: pop3-login: Login: user=, method=PLAIN, rip=::ffff:xxx.xxx.xx.xxx, lip=::ffff:xxx.xxx.xx.xxx, TLS dovecot: Feb 11 21:32:48 Error: POP3(mailtest): stat(/home/mailtest/MailDir/cur) failed: Permission denied dovecot: Feb 11 21:32:48 Error: POP3(mailtest): stat(/home/mailtest/MailDir/cur) failed: Permission denied dovecot: Feb 11 21:32:48 Error: POP3(mailtest): Couldn't open INBOX: Internal error occurred. Refer to server log for more information. [2011-02-11 21:32:48] dovecot: Feb 11 21:32:48 Info: POP3(mailtest): Couldn't open INBOX top=0/0, retr=0/0, del=0/0, size=0 Also, when attempting to login to squirrelmail or access the account via thunderbird/live mail etc, it obviously fails with a similar issue. Any suggestions or outside thinking on this would be a massive help! I've pretty much exhausted every resource, and tried every suggestion for my dovecot.conf file, but so far nothing seems to work :( I feel like it may be a permissions/ownership issue, but i'm lost as to specifics.

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• tail -f and then exit on matching string

  - by Patrick

  I am trying to configure a startup script which will startup tomcat, monitor the catalina.out for the string "Server startup", and then run another process. I have been trying various combinations of tail -f with grep and awk, but haven't got anything working yet. The main issue I am having seems to be with forcing the tail to die after grep or awk have matched the string. I have simplified to the following test case. test.sh is listed below: #!/bin/sh rm -f child.out ./child.sh > child.out & tail -f child.out | grep -q B child.sh is listed below: #!/bin/sh echo A sleep 20 echo B echo C sleep 40 echo D The behavior I am seeing is that grep exits after 20 seconds , however the tail will take a further 40 seconds to die. I understand why this is happening - tail will only notice that the pipe is gone when it writes to it which only happens when data gets appended to the file. This is compounded by the fact that tail is to be buffering the data and outputting the B and C characters as a single write (I confirmed this by strace). I have attempted to fix that with solutions I found elsewhere, such as using unbuffer command, but that didn't help. Anybody got any ideas for how to get this working how I expect it? Or ideas for waiting for successful Tomcat start (thinking about waiting for a TCP port to know it has started, but suspect that will become more complex that what I am trying to do now). I have managed to get it working with awk doing a "killall tail" on match, but I am not happy with that solution. Note I am trying to get this to work on RHEL4.

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• open-source LAMP package for simple accouting and receiving?

  - by user26664

  Hello. I am involved with a computer-based charity where we take donation of old equipment, often recycle it, mostly rehabilitate it and make it available through grants and 'adoptions', and sell some items. What we're looking for is a LAMP package that can handle our records of donations of equipment, print receipts for donators, and also track our thrift store sales with receipts. Donators will want receipts of their donations for tax deduction purposes. We'll want to print reports of incoming items from time to time, say monthly and yearly. For the thrift store, we'll also need receipts for that, reports of cash, especially for reconciling cash drops, and also reports of items sold from time to time. I'm thinking this might be a single package, but it might be two. We don't want to track our shop inventory with either of these programs -- that's another program/project. We just need to know what was donated and what was sold. It must be open source, and ideally we'd like it to run on LAMP -- Linux, Apache, MySQL, PHP, but we will consider other open-source platforms.

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• Windows Media Center showing Jerky Video on PC

  - by Kris Erickson

  I had to repave my Windows 7 x64 box last week due to a hard drive crash, and for a while everything was running perfectly but now all videos in Windows Media Center are jerky (the sound is fine, they just seem to skip a ton of frames all the time). This is on the local machine, but the same thing happens when I try to stream to my Xbox. The videos all show fine in VLC and Windows Media Player. I guess I must have installed something recently (in the process of getting all the apps I usually have running on my PC) that caused this but for the life of me I can't figure it out. I have updated to the latest video driver (and then rolled back to the standard Windows 7 driver), I have rolled back all the other drivers that I have installed (I believe). I have uninstalled all the codec packs (I also run TVersity, so I hate the TVersity codec pack installed), and I uninstalled TVersity. Nothing seems to help. I have uninstalled windows media center, and reinstalled it from the Programs and Features. I have basically ran out of things to try to fix this, and am almost thinking about reinstalling Windows again. Any suggestions?

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• Can you transfer a Windows 7 XP-mode VHD to a new PC without the need for reactivation?

  - by Henk

  Hi. At the moment I am running Vista 32 bit and use VPC 2007 a lot. I have several W2000 VMs set up with complex software configurations. For me, one of the advantages of working with VPCs is that a VM can easily be copied to another PC (like a notebook). Also, when I move to a new PC, I can immediately work with my existing VMs without the need to reinstall all applications. I am thinking about buying a new pc with Windows 7 64 bit pro, and using the xp-mode VM that comes with Windows 7. The advantages would be support for more memory (so being able to run more VM's simultaneously) and having a licenced XP VM. I would like to know if you can transfer a VHD that is based on the xp-mode VHD to another machine without Activation issues. The other machine will of course, also be running W7. I would guess that this would not be a problem. However, I did read about a guy who had to reinstall his W7 because of a harddisk failure, and could not access his xp-mode VHD anymore because it demanded re-activation. Thanks. Henk.

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• Disk Partitioning problem with fdisk.

  - by MA1

  Currently i am using fdisk to create/resize windows partitions. Following is a sample input script to fdisk to create/resize windows partitions: fdisk /dev/sda < partInput the contents of partInput are as follows: d #delete the partition 3 #partition number to be deleted n #add a new partition p #primary: type of new partition 3 #new partition number 18804 #start cylinder of new partition 77433 #end cylinder of new partition t #change the type of partition 3 #partition number whose type(filesystem) is to be changed 7 #HPFS/NTFS: partition type(filesystem) n #add a new partition p #primary: type of partition 77434 #first cylinder of new partition 77825 #end cylinder new partition w #write all the above changes As you see in the above input we are using cylinders for start and end. Earlier i am using sectors as unit and everything is working fine but getting problems when partitioning a 1.5TB hard drive. Then i changed the unit to cylinders but it is working on some machines not all. On some machines fdisk failed to create the partition table correctly. So, i am thinking to move to parted if there is no way to do the above using fdisk. Please also tell me how to correctly convert sectors to cylinders? How to perform all the above steps using parted without losing the data OR how to use fdisk correctly?

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• Dell R320 RAID 10 with CacheCade

  - by Geekman

  I'm looking for a higher-performance build for our 1RU Dell R320 servers, in terms of IOPS. Right now I'm fairly settled on: 4 x 600 GB 3.5" 15K RPM SAS RAID 1+0 array This should give good performance, but if possible, I want to also add an SSD Cache into the mix, but I'm not sure if there's enough room? According to the tech-specs, there's only up to 4 total 3.5" drive bays available. Is there any way to fit at least a single SSD drive along-side the 4x3.5" drives? I was hoping there's a special spot to put the cache SSD drive (though from memory, I doubt there'd be room). Or am I right in thinking that the cache drives are simply drives plugged in "normally" just as any other drive, but are nominated as CacheCade drives in the PERC controller? Are there any options for having the 4x600GB RAID 10 array, and the SSD cache drive, too? Based on the tech-specs (with up to 8x2.5" drives), maybe I need to use 2.5" SAS drives, leaving another 4 bays spare, plenty of room for the SSD cache drive. Has anyone achieved this using 3.5" drives, somehow?

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• Cheap desktop computer in 19" rack-mountable form-factor?

  - by Alex Basson

  I'm a high school teacher at a small private school. As of this year, we have SMARTBoards in every classroom (though I've had one in the class I share for two years now). The classrooms themselves don't have computers in them, so we teachers bring our laptops to class and connect them to the boards. This has several disadvantages: This takes a few minutes while we wait for the board to boot up and then orient the board to our individual laptop -- we have to do this every time b/c different teachers have different laptops requiring different orientations. This isn't ideal because when you only have 43 minutes per class period, waiting five minutes just to get started is a real waste. Carrying your laptop to class doesn't sound so bad until you consider that we're also carrying textbooks and piles of student papers, and we're carrying it all through crowded high school hallways. More than one laptop has fallen THUNK to the floor, with dire consequences. We feel we could eliminate the need to use our laptops with the SMARTBoards if we had a dedicated computer in each classroom hooked up to the board at all times. Each board set-up is connected to a podium with a standard 19" rack in it, currently housing a power supply and DVD player. There're plenty of rack spaces available. So I'm thinking: maybe we could get some inexpensive computers in a 19" rack-mountable form factor, install them in the podiums, and connect them to the boards on a permanent basis. Any suggestions?

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• File uploads and client_max_body_size in nginx + gunicorn + django

  - by carlosescri

  I need to configure nginx + gunicorn to be able to upload files greater than the default max size in both servers. My nginx .conf file looks like this: server { # ... location / { proxy_pass_header Server; proxy_set_header Host $http_host; proxy_redirect off; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Scheme $scheme; proxy_connect_timeout 60; proxy_pass http://localhost:8000/; } } The idea is to allow requests of 20M for two locations: /admin/path/to/upload?param=value /installer/other/path/to/upload?param=value I've tried to add location directives at the same level than the one I've pasted here (getting 404 errors) and also tried to add them inside the location / directive (getting 413 Entity Too Large errors). My location directives look like these in their simplest form: location /admin/path/to/upload/ { client_max_body_size 20M; } location /installer/other/path/to/upload/ { client_max_body_size 20M; } But they don't work (actually I tested lots of combinations and I'm desperate thinking about this. Please, help If you can: What settings do I need to set to make this work? Thank you so much!

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• Can a pool of memcache daemons be used to share sessions more efficiently?

  - by Tom

  We are moving from a 1 webserver setup to a two webserver setup and I need to start sharing PHP sessions between the two load balanced machines. We already have memcached installed (and started) and so I was pleasantly surprized that I could accomplish sharing sessions between the new servers by changing only 3 lines in the php.ini file (the session.save_handler and session.save_path): I replaced: session.save_handler = files with: session.save_handler = memcache Then on the master webserver I set the session.save_path to point to localhost: session.save_path="tcp://localhost:11211" and on the slave webserver I set the session.save_path to point to the master: session.save_path="tcp://192.168.0.1:11211" Job done, I tested it and it works. But... Obviously using memcache means the sessions are in RAM and will be lost if a machine is rebooted or the memcache daemon crashes - I'm a little concerned by this but I am a bit more worried about the network traffic between the two webservers (especially as we scale up) because whenever someone is load balanced to the slave webserver their sessions will be fetched across the network from the master webserver. I was wondering if I could define two save_paths so the machines look in their own session storage before using the network. For example: Master: session.save_path="tcp://localhost:11211, tcp://192.168.0.2:11211" Slave: session.save_path="tcp://localhost:11211, tcp://192.168.0.1:11211" Would this successfully share sessions across the servers AND help performance? i.e save network traffic 50% of the time. Or is this technique only for failovers (e.g. when one memcache daemon is unreachable)? Note: I'm not really asking specifically about memcache replication - more about whether the PHP memcache client can peak inside each memcache daemon in a pool, return a session if it finds one and only create a new session if it doesn't find one in all the stores. As I'm writing this I'm thinking I'm asking a bit much from PHP, lol... Assume: no sticky-sessions, round-robin load balancing, LAMP servers.

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• Configure one IIS site to handle two separate SSL certificates using external Load Balancing or SSL Acceleration Servers

  - by bmccleary

  I have one web application on our server that needs to be referenced by two different domain names, both of which have their own SSL certificates. The application is exactly the same for both domains, but we have to keep the two domain names for legal reasons. The problem is that, since both domains need to have their own SSL certificate, that inside of our IIS 7.5 configuration we have to have two separate IIS applications (both pointing to the same physical location) with their own unique IP address and SSL certificate installed. Now, I know that, due to the nature of SSL communications, that this is by design and that you can't assign more than one SSL certificate per IP address and domain name. My question is… is there any way around this limitation and keep one web application in IIS and have it service two SSL certificates based on host name? I know that with the basic IIS configuration that this is not possible, but I was thinking that with some sort of combination of external load balancing and/or SSL acceleration servers/services that we could have these servers process the SSL request and leave IIS clean to have one single application. I am not familiar at all with these technologies, hence the reason I am asking if it is theoretically possible. If not, does anyone else know how to achieve this?

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• What is the best way to connect a 3 switches with a router?

  - by Carlos Morales

  Hello everyone, I'm trying to rebuild the network from my work and I was thinking what is the best way to connect three switches and a router. The router has 4 ports so I thought to connect 2 switches to the router (each switch connected with 2 cables to the router) and then connect the third switch to one of the others with two cables. So is like this, two cables from switch one to the router, two cables from switch two to the router and two cables from switch 3 to switch 1 or 2. So my questions are: Is it better to connect the router to each switch with a cable or the more cables you have the better? If I connect the switch 3 to switch 1 or 2 is it better to connect it with a cable or you get better performance with more cables. If I'm wrong and there is a better or more efficient way to connect them please let me know. The router is a Netgear RP114 (I'll upgrade it to a Sonicwall NSA 240), switch 1 is a Netgear GS748T, switch 2 is a Cisco Catalyst 2924-XL and switch 3 is a D-link DGS-1024D Thank you very much

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• Upgrading MySQL Connector/Net

  - by Todd Grover

  I am trying to publish a website with our hosting provider. I am getting error due to the fact that they only allow a medium trust and the MySQL Connector/Net that I am using requires reflection to work. Unfortunately, reflection is not allowed in a medium trust. After some research I found out that the newest version of the MySQL Connector/Net may solve this problem. Connector/Net 6.6 includes enhancements to partial trust support to allow hosting services to deploy applications without installing the Connector/Net library in the GAC. I am thinking that will solve my problem. So, I unistalled MySQL Connector/Net 6.4.4 and I installed MySQL Connector/Net 6.6.4. When I run the application in Visual Studio 2010 I get the error: ProviderIncompatibleException was unhandled by user code The message is An error occurred while getting provider information from the database. This can be caused by Entity Framework using an incorrect connection string. Check the inner exceptions for details and ensure that the connection string is correct. InnerException is The provider did not return a ProviderManifestToken string. Everything works fine when I have Connector/Net 6.4.4 installed. I can access the database and perform Read/Write/Delete action against it. I have a reference to the following in the project: MySql.Data MySql.Data.Entity MySql.Web My connection string in Web.config <connectionStrings> <add name="AESSmartEntities" connectionString="server=ec2-xxx-xx-xxx-xx.compute-1.amazonaws.com; user=root; database=nunya; port=3306; password=xxxxxxx;" providerName="MySql.Data.MySqlClient" /> </connectionStrings> What might I be doing wrong? Do I need any additional setting(s) to work with version 6.6.4 that wasn't required in the older version 6.4.4?

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• Apache HTTPd FollowSymLinks path permission

  - by apast

  Hi, I'm configuring my development environment with a basic Apache HTTPd configuration. But, to avoid a often problem, I want to map my test URL to my development folder. I'm using Ubuntu. My development path is located under the following example path: /home/myusername/myworkspace/hptargetpath/src/pages Considering the following symbolic link mapping: #ls -l /opt/share/www/mydevelopmentrootpath: lrwxrwxrwx 1 root root 77 2011-02-13 18:53 /opt/share/www/mydevelopmentrootpath -> /home/myusername/myworkspace/hptargetpath/src/pages With this folder mapping, I configured Apache HTTPd with the following configuration: <VirtualHost *:*> ServerName local.server.com ServerAdmin [email protected] DirectoryIndex index.html DocumentRoot /opt/share/www/mydevelopmentrootpath <Directory /opt/share/www/mydevelopmentrootpath/ > Options +Indexes Options +FollowSymLinks AllowOverride None Order allow,deny Allow from all </Directory> </VirtualHost> But, I'm receiving a 403 Forbidden error when I want to access index.html under the address http://local.server.com/index.html. 403 Forbidden You don't have permission to access /index.html on this server. On httpd debug log, I checked the following message: [Sun Feb 13 19:34:47 2011] [error] [client 127.0.1.1] Symbolic link not allowed or link target not accessible: /opt/share/www/mydevelopmentrootpath I'm thinking that this problem is been generated by some path permission. It's not a direct permission to directory, but some intermediate directory in the path. There's a directive on httpd core Options: SymLinksIfOwnerMatch The server will only follow symbolic links for which the target file or directory is owned by the same user id as the link. But, I tested it without effects. Somebody may help me? I think that it's a trivial configuration on development environment. Best regards, And Past

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• Using WebDAV for automated downloads

  - by Geo Ego

  I currently manage a number of sites (at one point about a dozen, currently four, but soon growing into the dozens or hundreds) that serve a piece of software to clients at their remote locations. Our web server is Windows SBS Server 2k3, and the remote servers are Windows Server 2k3.When we have new versions of the software, I upload this new software to a specific directory and rename it; each time the clients boot, they pull their software from that specific directory. With just a few sites, it's no problem for me to RDP in and copy the files over. As the number grows, this will quickly become quite unwieldy. So I'm thinking that WebDAV would be part of a solution, so that I could simply push the newest version to our server (Windows SBS Server 2003) and make it available to the sites to grab. However, on the remote server side, what are some suggestions for automating the download? I only want the servers to download the files during downtime (between 3 AM and 9 AM), and I only want them to download if there is a new version available. I had thought of writing a program that checked the files on the WebDAV server at a regular interval, compared a hash of the current software to a hash of the software on the server, and only downloaded if they were different, but I'm wondering if there is something I am unaware of that can automate the process.

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• Multi-WAN bonding across different media

  - by Tom O'Connor

  I've recently been thinking again about a product that Viprinet provide, basically they've got a pair of routers, one that lives in a datacentre, Their VPN Multichannel Hub and the on-site hardware, their VPN multichannel routers They've also got a bunch of interface cards (like HWICs) for 3G, UMTS, Ethernet, ADSL and ISDN adapters. Their main spiel seems to be bonding across different media. It's something that I'd really like to use for a couple of projects, but their pricing is really quite extreme, the hub is about 1-2k, the routers are 2-6k, and the interface modules are 200-600 each. So, what I'd like to know is, is it possible with a couple of stock Cisco routers, 28xx or 18xx series, to do something similar, and basically connect a bunch of different WAN ports, but have it all presented neatly as one channel back to the internet, with seamless (or nearly) failover if one of the WAN interfaces should fail. Basically, If i got 3x 3G to ethernet modems, and each on a different network, I'd like to be able to loadbalance/bond across all of them, without having to pay Viprinet for the privilege. Does anyone know how I'd go about configuring something for myself, based around standard protocols (or vendor specific ones), but without actually having to buy the Viprinet hardware?

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• Wireless router that supports Bonjour between wire- and wireless- connected machines

  - by cefstat

  At home I have an ADSL modem that I use also as router. For the record, it is a DavoLink DV-2020 provided by Tele2 in the Netherlands. It turns out that if a computer is connected with a cable to the router and another computer is connected wirelessly, then they cannot see each other's services that are advertised through Bonjour (Apple's service discovery protocol, an implementation of Zeroconf). The combinations wired/wired and wireless/wireless work fine. This means that somehow wire- and wireless- connected machines are on different physical networks although their IPs are in the same range (192.168.1.*). The modem in question doesn't provide many options that I could play with. So, I was thinking of buying a second router to connect to the modem, and then connect all my machines to this second router. The problem is that I am afraid that I will have again the same problem. I am looking for suggestions on routers that offer the functionality I want (Bonjour between wired and wireless connections). I suppose that one solution would be Apple's Airport Extreme Base Station but at 160€ it is ridiculously expensive. Any other options out there? And why is it so difficult to find in the technical characteristics if wired and wireless connections are on the same physical network?

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• DNS failover in a two datacenter scenario

  - by wanson

  I'm trying to implement a low-cost solution for website high availability. I'm looking for the downsides of the following scenario: I have two servers with the same configuration, content, mysql replication (dual-master). They are in different datacenters - let's call them serverA and serverB. Users use serverA - serverB is more like a backup. Now, I want to use DNS failover, to switch users from serverA to serverB when serverA goes down. My idea is that I setup DNS servers (bind/powerdns) on serverA and serverB - let's call them ns1.website.com and ns2.website.com (assuming I own website.com). Then I configure my domain to use them as its nameservers. Both DNS servers will return serverA IP as my website's IP. If serverA goes down I can (either manually or automatically from serverB) change configuration of serverB's DNS, to return IP of serverB as website's IP. Of course the TTL will be low, as it's supposed to be in DNS failovers. I know that it may take some time to switch to serverB (DNS ttl, time to detect serverA failure, serverB DNS reconfiguration etc), and that some small part of users won't use serverB anyway. And I'm OK with that. But what are other downsides of such an approach? An alternative scenario is that ns1.website.com will return serverA IP as website's IP, and ns2.website.com will return serverB IP as website's IP. But AFAIK clients not always use primary nameserver and sometimes would use secondary one. So some small part of users would use serverB instead of serverA which is not quite what I'd like. Can you confirm that DNS clients behave like that and can you tell what percentage of clients would possibly use serverB instead of serverA (statistically)? This one also has the downside that when serverA goes back up, it will be automatically used as website's primary server, which is also a bad situation (cold cache, mysql replication could fail in the meantime etc). So I'm adding it only as a theoretical alternative. I was thinking about using some professional DNS failover companies but they charge for the number of DNS requests and the fees are very high (why?)

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• Replacing quotes in a file

  - by Matthijs

  I have a large number of large semicolon-separated data files. All string fields are surrounded by double quotes. In some of the files, there are extra quotes in the string fields, which messes up the subsequent importing of the data for analysis (I'm importing to Stata). This code allows me to see the problematic quotes using gnu-awk: echo '"This";"is";1;"line" of" data";""with";"extra quotes""' | awk 'BEGIN { FPAT = "([^;]+)|(\"[^\"]+\")"}; {for ( i=1 ; i<=NF ; i++ ) if ($i ~ /^"(.*".*)+"$/) {print NR, $i}}' 1 "line" of" data" 1 ""with" 1 "extra quotes"" but I do not know how to replace them. I was thinking of doing the replace manually, but it turns out that there are several hundred matches in some of the files. I know about awk's -sub-, -gsub-, and -match- functions, but I am not sure how to design a search and replace for this specific problem. In the example above, the respective fields should be "This", "is", 1, "line of data", "with", "extra quotes", that is: all semicolons are separators, and all quotes except for the outermost quotes should be removed. Should I may be use -sed-, or is -awk- the right tool? Hope you can help me out! Thanks, Matthijs

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• Win7 VM @ ESXi Server @ VMWorkstation (Win7) - ping works only from VM -> HostOS, not vice versa

  - by DK2000

  right now I'm toying around with VM Ware stuff and not having any pcs then my laptop I decided to run an ESXi Server inside of VWmware Workstation. I was just curios to see if the server would allow to setup and run a VM. And after some tweaking there it was, working like a charm. Okay not that fast but startin' the VM from vSphere and "opening a console" gave my direct access to that VM. Now I wanted to see if I could ping the host from the VM (VM Workstation Network is set to "host only"). And it worked, at least from the VM I could ping the ESXi server and the host. From the host I am able to ping the ESXi Server but I can't ping the VM! I asked myself anyway where the VM got its ip adress from. At the DCHPs IP there is at no machine after all. I even tried to use that DHCP adress for my Host and it didn't work out. You can see my settings from the screenshot here (it's pretty wide so just a link): http://yfrog.com/n4desktopfeop The only thing that got me thinking was when I once changed the ESXi's IP from 192.168.92.137 to 192.168.0.137. I still was able to connect to the ESXi server via its new IP but when I tried to run the VM console from vSphere I got an error after a while that said "couldnt connect to 192.168.92.137:903". So vSphere connects just through a port of the ESXi server to the VM?!? Could I setup a Linux VM to use it as a DHCP that I'd at least have control over the IPs that are given. Which lowest end linux could be used for this purpose?!? Thank you for your time! :)

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• What is the best way to connect 3 switches with a router?

  - by Carlos Morales

  Hello everyone, I'm trying to rebuild the network from my work and I was thinking what is the best way to connect three switches and a router. The router has 4 ports so I thought to connect 2 switches to the router (each switch connected with 2 cables to the router) and then connect the third switch to one of the others with two cables. So is like this, two cables from switch one to the router, two cables from switch two to the router and two cables from switch 3 to switch 1 or 2. So my questions are: Is it better to connect the router to each switch with a cable or the more cables you have the better? If I connect the switch 3 to switch 1 or 2 is it better to connect it with a cable or you get better performance with more cables. If I'm wrong and there is a better or more efficient way to connect them please let me know. The router is a Netgear RP114 (I'll upgrade it to a Sonicwall NSA 240), switch 1 is a Netgear GS748T, switch 2 is a Cisco Catalyst 2924-XL and switch 3 is a D-link DGS-1024D Thank you very much

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• Most scalable way of serving a small set of static HTTP content

  - by Ekevoo

  The story: Hi guys. I'm among the people responsible for serving the results of the most anticipated (by number of people participating) annual entrance exam in my state. As such, when our results are published, the interest is overwhelming. In the past we delegated the responsibility of serving the results to the media, but that spoils a little the officialness of these results. This year we went with a little (long overdue) experiment of using lighttpd instead of Apache as well as other physical network optimizations I wasn't directly involved with. The results were very satisfactory. The server didn't choke even once, nor we saw any of the usual Twitter complaints on unavailability and/or slowness that were previously common. However, because we still delegated the first publication of the results to the media I'm still not 100% sure we can handle the load of actually publishing the results first. The question: Now because these files are like 14MB in total and a true lightweight Linux distribution isn't that big either, I'm thinking: what if next year we run full RAMdrive? Is there any? Is that useful? Is that worth it for a team that uses Debian almost exclusively? Are there other optimizations that I should be focusing on instead?

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