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• How to transfer data between two networks efficiently

  - by Tono Nam

  I would like to transfer files between two places over the internet. Right now I have a VPN and I am able to browse, download and transfer files. So my question is not really how to transfer the files; Instead, I would like to use the most efficient approach because the two places constantly share a lot of data. The reason why I want to get rid of the VPN is because it is two slow. Having high upload speed is very expensive/impossible in residential places so I would like to use a different approach. I was thinking about using programs such as http://www.dropbox.com . The problem with Dropbox is that the free version comes with only 2 GB of storage. I think the deals they offer are OK and I might be willing to pay to get that increase in speed. But I am concerned with the speed of transferring data. Dropbox will upload the file to their server then send it from the server to the other location. I would like it to be even faster. Anyway I was thinking why not create a program myself. This is the algorithm that I was thinking of. Let me know if it sounds too crazy. (Remember my goal is to transfer files as fast as possible) Things that I will use in this algorithm: Server on the internet called S (Has fast download and upload speed. I pay to host a website and some services in there. I want to take advantage of it.) Client A at location 1 Client B at location 2 So lets say at location 1, 20 large files are created and need to be transferred to location 2. Client A compresses the files with the highest compression ratio possible. Client A starts sending data via UDP to client B. Because I am using UDP I will include the sequence number on each packet. Have server S help speed up things. For example every time a packet is lost we can use Server S to inform client A that it needs to resend a packet. Anyways I think this approach will increase the transfer rate. I do not know if it is possible to start sending data while it is being compressed. Or if it is possible to start decompressing data even if we are not done receiving the whole file. Maybe it will be faster to start sending the files right away without compressing. If I knew that I will always be sending large text files then I will obviously use the compression. I need this as a general algorithm. So I guess my question is could I increase performance by using UDP instead of TCP and by using an extra server to keep track of lost packets? And how should I compress files before sending? Compressing a 1 GB file with the highest compression ratio takes about 1 hour! I would like to take advantage of that time by sending it as it is being compressed.

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• How to transfer data between two netowks efficiently

  - by Tono Nam

  I will like to transfer files between two places over the internet. Right now I have a VPN and I am able to browse, download and transfer files. So my question is not really how to transfer the files; Instead, I will like to use the most efficient approach because the two places constantly share a lot of data. The reason why I want to get rid of the vpn is because it is two slow. Having high upload speed is very expensive/impossible on residential places so I will like to use a different approach. I was thinking about using programs such as http://www.dropbox.com . The problem with dropbox is it only enables 2 GB of storage in order for it to be free. I think the deals they offer are ok and I might be willing to pay to get that increase in speed. But I am concerned with the speed of transferring data. Dropbox will upload the file to their server then send it from the server to the other location. I will like it even faster lol. Anyways I was thinking why not create a program my self. This is the algorithm that I was thinking let me know if it sounds to crazy. (remember my goal is to transfer files as fastest as possible) Things that I will use in this algorithm: Server on the internet called S ( has fast download and upload speed. I pay to host a website and some services in there. I want to take advantage of it) Client A on location 1 Client B on location 2 So lets say on location 1 20 large files are created and need to be transferred to location 2. Client A compresses the files with the highest compression ratio possible. Client A starts sending data via UDP to client B. Because I am using UDP I will include the sequence number on each package. Have server S help speed up things. For example every time a package is lost we can use Server S to inform client A that it needs to resend a package. Anyways I think this approach will increase the transfer rate. I do not know if it is possible to start sending data meanwhile it is being compressed. Also if it is possible to start decompressing data even if we are not done receiving all the info. Maybe it will be faster to start sending the files right away without compressing. If I knew that I will always be sending large text files then I will obviously use the compression. I need this as a general algorithm. So i guess my question is should using UDP over TCP could increase performance by using an extra server to keep track of lost packages? and How should I compress files before sending? compressing a 1 GB file with the highest compression ration takes about 1 hour! I will like to take advantage of that time by sending it meanwhile it is compressed.

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• Jquery / PhP / Joomla Select one of two comboboxes does not get updated

  - by bluesbrother

  I am making a Joomla component wich has 3 comboboxes/selects on the page. One with languages and 2 with subjects. If you change the language the other two get filled with the same data (the subjects in the selected language) the name of the selectbox are different but otherwise the same. I get an error for one of the subject boxes (hence the url gets red), but there is no logic in wich one will give an error. In Firebug i get the HTML back for the one without the other and this one gets updated but the other one gives nothing back. If i right click in firebug on the one that gave the error, and do "send again" it will load fine. Is their a timing problem? The change event of the language selectbox: jQuery('#cmbldcoi_ldlink_language').bind('change', function() { var cmbLangID = jQuery('#cmbldcoi_ldlink_language').val(); if (cmbLangID !=0) { getSubjectCmb_lang(cmbLangID, 'cmbldcoi_ldlink_subjects', '#ldlinksubjects'); } }); Function that requests the php file to create the html for the select: function getSubjectCmb_lang(langID, cmbName, DivWhereIn) { var xdate = new Date().getTime(); var url = 'index.php?option=com_ldadmin&view=ldadmin&format=raw&task=getcmbsubj_lang&langid=' + langID + '&cmbname=' + cmbName + '&'+ xdate; jQuery(DivWhereIn).load(url, function(){ }); } And in the php file there is a connection made to the database to ge the information to build the selectbox. I use a function for this that is okay because it makes al my selectboxes. The only place where there are problems with select boxes is on the pages that has 2 selects that need to change when a third one changed. My guess it is somewhere in the Jquery where this goes wrong. And i think it has to do with timing. But i am open for all sugestions. Thanx. UPDATE: No the ID and Name fields are different. They are named : cmbldcoi_child cmbldcoi_parent Here is my code: The change event for the first combobox which makes the other two change: jQuery('#cmbldcoi_language_chain_subj').bind('change', function(){ var langID = jQuery('#cmbldcoi_language_chain_subj').val(); if (langID != 0){ getSubjectCmb_lang(langID, 'cmbldcoi_child', '#div_cmbldcoi_child'); getSubjectCmb_lang(langID, 'cmbldcoi_parent', '#div_cmbldcoi_parent'); } }); } The function wicht calls the php file to get the info from the database: function getSubjectCmb_lang(langID, cmbName, DivWhereIn){ var xdate = new Date().getTime(); var url = 'index.php?option=com_ldadmin&view=ldadmin&format=raw&task=getcmbsubj_lang&langid=' + langID + '&cmbname=' + cmbName + '&'+ xdate; jQuery(DivWhereIn).load(url, function(){ }); } The PHP code function getcmbsubj_lang(){ $langid = JRequest::getVar('langid'); if ($langid > 0 ){ $langid = JRequest::getVar('langid'); }else{ $langid = 1; } $cmbName = JRequest::getVar('cmbname'); //$lang_sufx = self::get_#__sufx($langid); print ld_html::ld_create_cmb_html($cmbName, '#__ldcoi_subjects','id', 'subject_name', " WHERE id_language={$langid} ORDER BY subject_name" ); } There is a class wich is called ld_html wich has an funnction in it that creates a combobox. ld_html::ld_create_cmb_html() It gets an table name, id field, namefield and optional an where clause. It all works fine if there is just one combobox thats needs updating. It give a problem when there are two. Thanks for the help !

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• Managing scalability and availability with two servers running Apache Httpd, Apache Mina and MySQL

  - by celalo

  Hello, I am not a developer and I don't much experience with scalable server architectures. But I am in need of a highly available and scalable system for one of my projects. There is going to be two servers I am going to use for the time being. Both with 4 core CPUs and 8 GB RAM with RAID structures running CentOS 5.4. I will also have feature called "Failover IP" which enables to direct an IP address to another server within short time. The applications which will be run on the servers: There is going to be a Java application based on Apache Mina server for handling TCP requests from some hundreds of network devices where the devices are going to send request as much as one request per minute. Handling those requests, includes parsing the requests and inserting a few rows to the Database. Parsing requests before inserting data to the DB does take neglectable time. There is going to be MySQL server, as I stated above. Also there is going to be a PHP web application running on Apache Httpd Server which uses the same DB with the Java application. What I wish to have is to make use of those two servers at the most. I was imagining to have the servers identical, sharing the work load. MySQL could be a cluster maybe? And if some application fails or the whole machine goes down, the other will continue serving the requests seamlessly. Reminding that a "Failover IP" feature will be available for me to take advantage of. Also, It should be kept in mind that number of servers could increase in time, to meet the demand. What can you suggest? Which kind of tools I can make use of? Which kind of monitoring software (paid/unpaid) I have? Thanks in advance.

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• Latency between IIS and SQL on same physical, two VMs

  - by Jerad Rose

  I have a single server (2x4 core CPUs, 32GB ram), that is a Windows Server 2012 Hyper V host, and it hosts two guest VMs (also Windows Server 2012 instances). One of them is a web server, the other is a SQL server. When hitting a page that loops over 50 records, there is noticeable latency. I capture/report the timings of each iteration on the loop, and each iteration is about 20-30 milliseconds. Of course, this amounts to over a second of latency for the whole loop. I thought maybe SQL needed to be tuned, but running profiler on it, the queries are showing almost 0 duration, so it seems the bottleneck is in transit between the two VMs. I have both VMs configured to use the actual NIC (vs. using a VNIC), so maybe that's part of my problem. Also, this is a classic ASP site, so it's using the SQL OLE DB provider, and I'm wondering if that is part of the problem. This is a new server setup, from an existing Windows 2003/IIS6 server setup where both web and DB run on the same server instance (no virtualization). On that setup, there is no such latency when looping over the cursor like this. But there are so many variables, I'm not sure where to start ruling things out.

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• Forward all tracif from one IP to another Ip on OS X

  - by Josh

  This is related to this question I just asked... I have two IP address on my iMac I want to "bridge". I'm not sure what the proper terminology is... here's the situation. My iMac has a firewire connection to my laptop and an ethernet connection to the rest of my office. My laptop has an ip of 192.168.100.2 (on the firewire interface). My iMac has an IP of 192.168.100.1 on the firewire interface, and two IPs, 10.1.0.6 and 10.1.0.7, on it's ethernet interface. If I wanted to forward all traffic coming in from 192.168.100.2 on my OS X machine to go out on IP 10.1.0.7, and vice-versa, can this be done? I assume I would use the ipfw command. Essentially I want to "bridge" the firewire network to the ethernet network so my laptop can see all the machines on the 10.1 network, and all those machines can see my laptop at 10.1.0.7. Is this possible?

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• Most transparent way to connect two LANS using a WET610N Wireless Bridge

  - by Spencer Ruport

  I have two wired systems hooked to a Linksys WRT54GL wired/wireless router which is also hooked to my internet. I'll refer to this as LAN1. I have two more systems in another room that are connected wirelessly. Recently I decided I would much rather have another wired LAN in the other room and use a bridge to connect them. This would be LAN2. Prior to hooking up the device I assumed that the ethernet side of the bridge would have a DHCP server so that I could simply hook it up to a switch and I'd be on my way. However that isn't the case which leads me to believe I'll have to add one to LAN2 correct? Or is there some way to have the DHCP from LAN1 also hand out IP addresses to LAN2? If I do need a DHCP device on LAN2 what would be best? Another hardware device or should I just install some DHCP software on one of the systems (since they're both on 24/7 anyway). Any recommendations would be appreciated. :)

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• Slow transfer speed between two servers

  - by Linux Guy

  I have two servers both network cards speed is 10Gbps The inbound bandwidth between two servers is 10Gbps , the outbound bandwidth internet bandwidth is 500Mpbs Both servers using public ip addresses in public and private network Both servers transfer and connection on nginx port , and the server B used for streaming media , like youtube stream videos I check the transfer speed using iperf utility From Server A to Server B # iperf -c 0.0.0.1 -p 8777 ------------------------------------------------------------ Client connecting to 0.0.0.1, TCP port 8777 TCP window size: 85.3 KByte (default) ------------------------------------------------------------ [ 3] local 0.0.0.0 port 38895 connected with 0.0.0.1 port 8777 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.8 sec 528 KBytes 399 Kbits/sec My Current Connections in Server B # netstat -an|grep ":8777"|awk '/tcp/ {print $6}'|sort -nr| uniq -c 2072 TIME_WAIT 28 SYN_RECV 1 LISTEN 189 LAST_ACK 139 FIN_WAIT2 373 FIN_WAIT1 3381 ESTABLISHED 34 CLOSING Server A Network Card Information Settings for eth0: Supported ports: [ TP ] Supported link modes: 100baseT/Full 1000baseT/Full 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 10000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: external Auto-negotiation: on MDI-X: Unknown Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes Server B Network Card Information Settings for eth2: Supported ports: [ FIBRE ] Supported link modes: 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: No Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: No Speed: 10000Mb/s Duplex: Full Port: Direct Attach Copper PHYAD: 0 Transceiver: external Auto-negotiation: off Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes The problem is : as you can see from iperf utility, the transfer speed from server A to server B slow when i restart network service the connection will be ok , after 2 minutes , it's getting slow How could i troubleshoot slow speed issue and fix it in server B ? Notice : if there any other commands i should execute in servers for more information, so it might help resolve the problem , let me know in comments

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• Determine the time difference between two linux servers

  - by Paul

  I am troubleshooting a latency network issue on a network. It is probably a nic or cabling issue, but while I was going through the process of figuring it out, I was looking at the timings of a ping packet leaving a network card and arriving at another server. Both linux. So I have tcpdump running on both, and I issue a ping from one to the other, and back again, and looking at the timing differences might have shed light on where the latency is coming from. It is an academic exercise now, as I need to eliminate some more fundamental causes, but I was curious as to how this could be achieved. Given that ntpd is installed and running on two servers, how can I confirm the current time discrepency between the two servers, to whatever level of accuracy is possible - given that we are talking about latency on a local lan, which is ideally a millisecond or so. NTP itself is accurate to a couple of ms under good conditions, and as both servers are in the same environment, they should (presumably) achieve a similar level of accuracy, and so should have a time discrepency between them of a only few ms - but how can I check this?

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• Sharing two SSL wildcard certificates in memory in nginx

  - by hvtilborg

  I have an nginx server running with two IP addresses, say 1.2.3.4 and 4.3.2.1. Besides there are two wildcard SSL certificates for *.example.net (i.e. wc1, pointing to 1.2.3.4) and *.sub.example.net (i.e. wc2, pointing to 4.3.2.1). The nginx docs mention that you can share a wildcard certificate between server instances like this: ssl_certificate wc1.crt; ssl_certificate_key wc1.key; server { listen 1.2.3.4:443; server_name www.example.net; ssl on; ... } server { listen 1.2.3.4:443; server_name test.example.net; ssl on; ... } However, I was wondering whether this same construct is possible to use with the second wildcard certificate too. Both domains have around 500 subdomains. Do they not get mixed up, since the ssl_certificate construct is now global?

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• Reconfiguring, then deleting obsolete pagefile.sys from C: in one go using a batch script

  - by DanielSmedegaardBuus

  I'm trying to set up an automated script for a Windows XP installer. It's a batch script that runs on first boot after installation, and among the things I'm trying to accomplish, is removing the pagefile from C: entirely, and putting a 16-768 MB pagefile on D: instead. Here're my batch file instructions: echo === Creating new page file on D: ... cscript %windir%\system32\pagefileconfig.vbs /create /i 16 /m 768 /vo d: >nul echo. echo === Removing old page file from C: ... cscript %windir%\system32\pagefileconfig.vbs /delete /vo C: attrib -s -h c:\pagefile.sys del c:\pagefile.sys My problem is that while these are sane commands, the removal of the pagefile on C: requires me to reboot before those commands succeed.b Or, in other words — I have to first create the D: pagefile, then reboot and delete the c:\pagefile.sys file, or I'm stuck with a c:\pagefile.sys file which isn't even recognized by Windows itself (it'll just say that there's a page file on D:, and that C: has no pagefile at all). Obviously because already some pages are written to the C:\pagefile.sys file. So how would I go about accomplishing this in one go? Or, in two gos, if this is "batch scriptable" :) TIA, Daniel :) EDIT: I should probably clarify: Running those commands above are all valid, but they'll only succeed fully if I re-run the "attrib" and "del" commands at next boot. The C: pagefile is in use at the time, so I cannot delete the file it uses, and Windows itself won't remove it when I configure it to not use C: as a page file drive. Instead, it'll leave an orphaned c:\pagefile.sys file behind (which is really large). I don't necessarily need this to work in one go, registering the last two commands to run after a reboot would also be great :)

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• Can't install SB750 RAID drivers in Windows 7 for two additional storage drives

  - by jf46

  Mobo: ASUS M4A79XTD, 790X/SB750 OS: Windows 7 x64 I currently have SATA 1-4 set to RAID and SATA 5-6 set to IDE. I have an SSD connected to SATA5 with Windows 7 installed on it, and that works fine. I also have configured a RAID 1 array of two 1TB HDDs, connected to SATA 1 and 2. These don't show up in Windows, and I'm having trouble getting the RAID driver installed. I even tried booting from the Windows DVD and repairing or installing Windows, but when I navigated to the relevant .sys files on my motherboard's driver CD, Windows setup told me that the files in question weren't relevant to my hardware. To be clear: I'm not trying to install Windows on a RAID. I have Windows installed on a separate disk on a separate SATA controller. I just want to get the SB750 RAID drivers installed so that the Windows disk utility can see my RAID 1 array, which is composed of two other disks. Do I need to wipe my SSD and reinstall Windows to get the RAID driver installed? That seems kind of ridiculous, and given what I described above, I'm not even sure it would work. Any help or guidance would be appreciated - thanks! Edit: Also, I've copied the driver files from the mobo CD into system32 and rebooted, no luck. Then I changed HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iaStorV\Start from 3 to 0, and that didn't work either.

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• Sorting/grouping when there are multiple values in one cell

  - by ngm

  I have an Excel 2007 spreadsheet, where each row of the dataset describes a feature of a piece of software. One of the columns in the spreadsheet is Relevant Users, which describes which users of the software the feature is of interest to. There may be a couple of different users interested in a feature, in which case I've been filling in the cell with the two user types separated by a colon, e.g. 'Usertype A; Usertype D'. Occassionally, I'd like to sort my data by the Relevant Users column. However, the way I'm populating the column means the sorting isn't very smart. If I have a feature where 'Relevant Users' is 'Usertype A; Usertype D', and then I sort by Relevant Users, that feature will be grouped at the end of all the other features of relevant to Usertype A, as it's just sorting alphabetically. But I want it to be listed in the two separate groups of Usertype A and Usertype D. Or, if I have a pivot table that groups the features together under the heading of Relevant User, I'll get all the features for 'Usertype A', then 'Usertype B', then 'Usertype C', then 'Usertype D', then 'Usertype A; Usertype D', etc. Whereas I really want a feature with Relevant Users as 'Usertype A; Usertype D' to show up in both the Usertype A group and the Usertype D group. I guess if this information was in a database I might have a many-to-many table linking Relevant Users to features. But is there a way to go about having this kind of many-to-many relationship in Excel?

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• Routing for Two Hosts Behind a IPSec Tunnel

  - by Brent

  Network A 10.110.15.0/24 Firewall is .1 Host A is .2 Network B 10.110.16.0/24 Firewall is .1 Host B is .2 Two Cisco ASA's. IPSec tunnel with a crypo map that secures 10.110.15.0/24 <- 10.110.16.0/24. Let's say two hosts, 10.110.15.2 and 10.110.16.2 need to talk to each other. Normally I have to enter a persistent static route on a each host along the lines of: route add 10.110.16.0 mask 255.255.255.0 10.110.15.1 metric 1 -p (on the "A" box) I also have to enter another persistent static route on the .16 host in order for the traffic to know how to get back to the .15 network. Note that the default for each machine IS the firewall, so .1. I have no problem adding persistent routes on Windows/ESX/*nux machines but what about a smart switch in the .16 network that I want to manage from the .15 network. Do I need to run a routing protocol? Do I need to have Reverse Route Injection enabled on both ends of the IPSec tunnel? Should I add a route on the firewall? If so, how do you formulate it? Does it get a metric of 1 and my default route 0.0.0.0 get a metric of 2?

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• Passing two arguments to a command using pipes

  - by firebat

  Usually, we only need to pass one argument: echo abc | cat echo abc | cat some_file - echo abc | cat - some_file Is there a way to pass two arguments? Something like {echo abc , echo xyz} | cat cat `echo abc` `echo xyz` I could just store both results in a file first echo abc > file1 echo xyz > file2 cat file1 file2 But then I might accidentally overwrite a file, which is not ok. This is going into a non-interactive script. Basically, I need a way to pass the results of two arbitrary commands to cat without writing to a file. UPDATE: Sorry, the example masks the problem. While { echo abc ; echo xyz ; } | cat does seem to work, the output is due to the echos, not the cat. A better example would be { cut -f2 -d, file1; cut -f1 -d, file2; } | paste -d, which does not work as expected. With file1: a,b c,d file2: 1,2 3,4 Expected output is: b,1 d,3 RESOLVED: Use process substitution: cat <(command1) <(command2) Alternatively, make named pipes using mkfifo: mkfifo temp1 mkfifo temp2 command1 > temp1 & command2 > temp2 & cat temp1 temp2 Less elegant and more verbose, but works fine, as long as you make sure temp1 and temp2 don't exist before hand.

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• Multiple IP's using one NIC connectivity problem - Windows

  - by Vincent

  I have a frame relay network that is directly connected to a GPRS network. I also have a ADSL high speed network and recently I have been trying to achieve the following network configuration using windows 7 (Also tried XP) with no success to date. On one server I have two NIC's NIC1 I would like the following two static IP address's 10.0.1.110 and 10.0.1.200 the cisco router has a default gateway of 10.0.1.1 the ADSL is DHCP. NIC1 and the cisco router do not have access to the internet. NIC2 is setup for DHCP with a primary DNS and secondary DNS configured to enable internet connectivity. With NIC1 all incoming TCP connections are from IP address's starting with 10.192.x.x I cannot establish a TCP connection to both 10.0.1.110 and 10.0.1.200. Its either one or the other. I have a static route implemented in windows of: route -p 10.192.0.0 mask 255.255.0.0 10.0.1.1 metric 1 I have tried leaving out the gateway in the NIC1 and many other combinations with no success. Can anyone please help? What am I doing wrong?

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• Configuring three monitors with two Radeon X1600/X1650 graphics cards under Ubuntu

  - by cpm

  I have three SyncMaster 932a monitors I want to use with two Radeon X1600/X1650 cards under Linux. I am running X.org X Server 1.6.0, as provided by Ubuntu's Wubi installer. After turning off mirroring, I ended up with this xorg.conf: Section "Monitor" Identifier "Configured Monitor" EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" SubSection "Display" Virtual 2560 1024 EndSubSection EndSection Section "Device" Identifier "Configured Video Device" EndSection The left monitor had a menu bar and a task bar, the center monitor was just desktop, and windows would maximize to the current monitor. The third monitor and second graphics card weren't being used at all. Then I changed my configuration to manually specify each card with their PCI bus: Section "ServerLayout" Identifier "TheLayout" Screen 0 "Radeon Screen 1" Screen 1 "Radeon Screen 2" RightOf "Radeon Screen 1" EndSection Section "Screen" Identifier "Radeon Screen 1" Monitor "Configured Monitor" Device "Radeon the First" SubSection "Display" Virtual 2560 1024 EndSubSection EndSection Section "Screen" Identifier "Radeon Screen 2" Monitor "Configured Monitor" Device "Radeon the Second" EndSection Section "Device" Identifier "Radeon the First" Driver "radeon" BusID "PCI:1:0:0" EndSection Section "Device" Identifier "Radeon the Second" Driver "radeon" BusID "PCI:2:0:0" EndSection Section "Monitor" Identifier "Configured Monitor" EndSection Now both the left and right monitors have task bars and menu bars. Windows cannot be dragged from the first two monitors to the third monitor. Also, maximizing in the left or center window fills both monitors. I also tried adding Option "Xinerama" "true" to the ServerLayout section. X11 wasn't able to start up. I want to: Allow moving windows along all three monitors. Maximizing only fills the current monitor. Either have menu/task bars on only the left monitor or all three monitors How can I make this possible?

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• finding the best network latency between two countries

  - by Yoav Aner

  I know there are many tools to test for bandwidth and latency, but they all rely on having at least one host from which you can run those tests. I wonder whether there's an online source or some other way to guestimate the latency or speed between two countries (in general). For example, would a customer in Japan get lower latency if the server is located in Singapore or Australia? Is a user in India likely to get higher download speed from a server in the UK or in the US? Are there any online resources or some clever ways to answer those questions with a reasonable degree of accuracy? [UPDATE]: Thanks for the great suggestions from Raffael Luthiger. I didn't know about those looking glass servers. The submarine cable maps were also really cool to discover (Thanks to Jesper Mortensen). Also seems really wise if I could ask those network professional in the area for their experience, but obviously I don't have access to those. At least some of them are on SF :) However, I'm still a little unsure how to combine those resources to give me some measurements. This is the information I have: Two countries (A,B). I do have IP addresses of customers in country A (I can obtain those from the web server log files for example). Presumably I can find some looking glass servers in country B and run a trace to those IPs. What's the best measurements to use? Are there any scripts that help automate at least some of this process?

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• Forward mDns from one subnet to another?

  - by user37278

  Is there an ipfw rule that can easily forward mDns packets from one subnet to another? I have a Snow Leopard Server machine serving as the gateway between the two subnets and would like for machines in each subnet to see the services available in the other subnet. The gateway machine is already confirmed as configured correctly such that packets route correctly between the two subnets (ping works, traceroute shows the subnet hop, etc). My problem in designing a ipfw rule is that I don't know how to instruct that I would like multicast packets addressed to 224.0.0.251:5353 on en0 to be addressed to the same ip/port but on fw0 (the other interface). I attempted a rule such as fwd 192.168.10.1 log udp from 192.168.1.0/24 to 224.0.0.251 recv en1 to force the packet to hop over to the other interface (from en1 to fw0), but no dice. The ipfw log shows that the rule is being triggered by packets, but tcpdump isn't showing any packets on the other interface. Also, the only other firewall rules in place are the divert port 8668 and rule #65535 "allow any to any". Any suggestions? Thanks.

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• Configuring three monitors with two Radeon X1600/X1650 graphics cards under Ubuntu

  - by cpm

  I have three SyncMaster 932a monitors I want to use with two Radeon X1600/X1650 cards under Linux. I am running X.org X Server 1.6.0, as provided by Ubuntu's Wubi installer. After turning off mirroring, I ended up with this xorg.conf: Section "Monitor" Identifier "Configured Monitor" EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" SubSection "Display" Virtual 2560 1024 EndSubSection EndSection Section "Device" Identifier "Configured Video Device" EndSection The left monitor had a menu bar and a task bar, the center monitor was just desktop, and windows would maximize to the current monitor. The third monitor and second graphics card weren't being used at all. Then I changed my configuration to manually specify each card with their PCI bus: Section "ServerLayout" Identifier "TheLayout" Screen 0 "Radeon Screen 1" Screen 1 "Radeon Screen 2" RightOf "Radeon Screen 1" EndSection Section "Screen" Identifier "Radeon Screen 1" Monitor "Configured Monitor" Device "Radeon the First" SubSection "Display" Virtual 2560 1024 EndSubSection EndSection Section "Screen" Identifier "Radeon Screen 2" Monitor "Configured Monitor" Device "Radeon the Second" EndSection Section "Device" Identifier "Radeon the First" Driver "radeon" BusID "PCI:1:0:0" EndSection Section "Device" Identifier "Radeon the Second" Driver "radeon" BusID "PCI:2:0:0" EndSection Section "Monitor" Identifier "Configured Monitor" EndSection Now both the left and right monitors have task bars and menu bars. Windows cannot be dragged from the first two monitors to the third monitor. Also, maximizing in the left or center window fills both monitors. I also tried adding Option "Xinerama" "true" to the ServerLayout section. X11 wasn't able to start up. I want to: Allow moving windows along all three monitors. Maximizing only fills the current monitor. Either have menu/task bars on only the left monitor or all three monitors How can I make this possible?

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• Multiple rack apps on nginx + passenger, one as root, the other not...config help

  - by cannikin

  So I've got two apps I want to run on a server. One app I would like to be the "default" app--that is, all URLs should be sent this app by default, except for a certain path, lets call it /foo: http://mydomain.com/ -> app1 http://mydomain.com/apples -> app1 http://mydomain.com/foo -> app2 My two rack apps are installed like so: /var /www /apps /app1 app.rb config.ru /public /app2 app.rb config.ru /public app1 -> apps/app1/public app2 -> apps/app2/public (app1 and app2 are symlinks to their respective apps' public directories). This is the Passenger setup for sub URIs described here: http://www.modrails.com/documentation/Users%20guide%20Nginx.html#deploying_rack_to_sub_uri With the following config I've got /foo going to app2: server { listen 80; server_name mydomain.com; root /var/www; passenger_enabled on; passenger_base_uri /app1; passenger_base_uri /app2; location /foo { rewrite ^.*$ /app2 last; } } Now, how do I get app1 to pick up everything else? I've tried the following (placed after the location /foo directive), but I get a 500 with an infinite internal redirect in error.log: location / { rewrite ^(.*)$ /app1$1 last; } I hoped that the last directive would prevent that infinite redirect, but I guess not. /foo gets the same error. Any ideas? Thanks!

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• Two screens hooked to one laptop

  - by mplacona

  Hi, I'm thinking of getting rid of my desktop, and using my (much better) laptop instead. I'm only wondering if I would be able to hook the two screens I have with it, so I'd end up with three screens. I've seen people doing it to desktops, but am not sure the same could be accomplished with a laptop. My laptop is a sony vaio, and it's got both a VGA output, and an HDMI output. It'd be great is I could simply hook two screens to it, and have three independent screens (not mirrored). on my desktop, I have pretty much the same thing, but with an extra DVI port. I connect the DVI to one screen, and the VGA to an older one. Trying to connect anything to the HDMI simply mirrors whatever is on the DVI (I've tried it a long time ago) So I was wondering if with the laptop I'd be able to do it, and end up with three independent screens. I don't know if there's anything else I could be using instead (i.e. any extra hardware), so recommendations are more than welcome. Thanks in advance, Marcos

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• Forward all traffic from one IP to another Ip on OS X

  - by Josh

  This is related to this question I just asked... I have two IP address on my iMac I want to "bridge". I'm not sure what the proper terminology is... here's the situation. My iMac has a firewire connection to my laptop and an ethernet connection to the rest of my office. My laptop has an ip of 192.168.100.2 (on the firewire interface). My iMac has an IP of 192.168.100.1 on the firewire interface, and two IPs, 10.1.0.6 and 10.1.0.7, on it's ethernet interface. If I wanted to forward all traffic coming in from 192.168.100.2 on my OS X machine to go out on IP 10.1.0.7, and vice-versa, can this be done? I assume I would use the ipfw command. Essentially I want to "bridge" the firewire network to the ethernet network so my laptop can see all the machines on the 10.1 network, and all those machines can see my laptop at 10.1.0.7. Is this possible?

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• Two screens hooked to one laptop

  - by mplacona

  Hi, I'm thinking of getting rid of my desktop, and using my (much better) laptop instead. I'm only wondering if I would be able to hook the two screens I have with it, so I'd end up with three screens. I've seen people doing it to desktops, but am not sure the same could be accomplished with a laptop. My laptop is a sony vaio, and it's got both a VGA output, and an HDMI output. It'd be great is I could simply hook two screens to it, and have three independent screens (not mirrored). on my desktop, I have pretty much the same thing, but with an extra DVI port. I connect the DVI to one screen, and the VGA to an older one. Trying to connect anything to the HDMI simply mirrors whatever is on the DVI (I've tried it a long time ago) So I was wondering if with the laptop I'd be able to do it, and end up with three independent screens. I don't know if there's anything else I could be using instead (i.e. any extra hardware), so recommendations are more than welcome. Thanks in advance, Marcos

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• Using the full width of an Excel chart with two Y-axes

  - by Jørn Schou-Rode

  I am trying to create a line chart in MicrosoftExcel 2007 with two data series, each with their own Y-axis. First, I create a simple chart by selecting the two data series, and choosing Insert > Charts > Line from the Ribbon. I now see the following chart in my workbook: I then continue my quest by right clicking one of the data series (lines) and choosing Format data series > Series Options > Secondary Axis. My chart is now looks like this: This is almost what I want. I did not expect to see the gap between the last X-axis tick point (x = 5) and the secondary (right most) Y-axis. Why does Excel introduce this gap? Is there anything I can do to avoid it? I have tried right clicking the X-axis and seleting Format Axis > Axis Options > Position Axis: Between tick marks, but that only introduces a similar gap on by the primary (left most) Y-axis.

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