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• Role of OSI layers when we open a url in browser?

  - by user2715898

  I have searched on this topic a lot but I am not able to understand how and where OSI layers (Application, Presentation, Session, Transport, Network, Datalink, Physical) come into picture in the whole process of opening a webpage in browser. I have read this - http://stackoverflow.com/questions/2092527/what-happens-when-you-type-in-a-url-in-browser?lq=1 and I know all the functions of all the layers that are there in OSI model. Also, do we use OSI model or TCP/IP in the whole process? Basically I am having problem linking all the things together. And please forgive me if there are resources out there that explain this concept. You can definitely point to them.

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• How do I check if a process (Firefox) has quit?

  - by Al_Jehle

  I am using Ubuntu 12.04 64-bit, with all updates installed. I made a simple shell script that starts a SOCKS5 tunnel and launches Firefox (with correct network proxy settings) to use the tunnel. How do I recognize when Firefox has ended (when I close it) so that I can close the tunnel? Also, it would be awesome if I could run this in the background, but not necessary. #!/bin/sh ssh -fCN -D 10000 server.com firefox //To lauch firefox using Ubuntu ? Code to determine when firefox has quit Code that kills the tunnel

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• Synergy over a LAN bridge in Windows 7 64-bit, connection timing out

  - by bmozzy

  I haven't seen a question like this anywhere, so I hope it isn't a duplicate. Anyway, I have two computers, and one of them has its network connection through a LAN bridge in the other, which goes to a router. I want to set them up so that the one with the bridge is the server, and the other is the client. I followed the instructions to get everything set up, and the client keeps saying that the connection timed out. Here are screenshots of Synergy running on the server and client, as well as one of the server's configuration. Thanks in advance for the help!

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• Restoring a backup SQL Server 2005 where is the data stored?

  - by sc_ray

  I have two Sql Server database instances on two different machines across the network. Lets call these servers A and B. Due to some infrastructural issues, I had to make a complete backup of the database on server A and robocopy the A.bak over to a shared drive accessible by both A and B. What I want is to restore the database on B. My first issue is to restore the backup on server B but the backup location does not display my shared drive. My next issue is that server B's C: drive has barely any space left and there are some additional partitions that have more space and can house my backup file but I am not sure what happens to the data after I restore the database on B. Would the backup data fill up all the available space on C:? It will be great if somebody explain how the data is laid out after the restore database is initiated on a target database server? Thanks

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• Webserver - Memory-bound or CPU-bound? [closed]

  - by JJP

  Possible Duplicate: How do you do Load Testing and Capacity Planning for Web Sites I'm installing a social network using Zend Framework & MySql, with lots of plugins & queries. I want Webserver & Sql server on one box. I'm trying to choose between two machines (on hetzner.de): A) intel i7-2600 3.4 GHz 16 GB DDR3 RAM B) intel i7-920 2.6 GHz 24 GB DDR3 RAM B has 50% more RAM but 30% slower clock speed. Q is: is it obvious where the bottleneck will be? Would I ever need 24GB of RAM, even with lots of concurrent users?

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• Administrators: People interaction and Working hours?

  - by sanksjaya

  Do admins get to meet a lot of new people on a daily basis at work? And what kind of people domain do they interact with? Secondly, I've had this myth for a long time that unlike programmers, Network/System/Security Admins get locked-up in a den and juiced up late nights and early mornings. Most of the time they had to slip out of work without being noticed. How true and often does this happen for you? I understand there is no specific answer to this question as it depends on the type of working organization. But just looking out for answers from your experience. Thanks :) Clarification: I've had the question posted on to stackoverflow and they closed it. So I posted it here.

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• All created VPNs result in Error 720

  - by campo

  I have a few different VPNs I need to connect to. I'm using windows 8 and standard ptpp VPN. Every VPN I have created though results in the same error: Error 720: A connection to the remote computer could not be established You might need to change the network settings for this connection The VPN works in Windows 7 and XP. I'm not sure if this has something to do with my new laptop or if its something with Windows 8 itself. Any help would be greatly appreciated and if there is any extra info I can provide please let me know. Edit: I've tried with virus scanner turned off and windows firewall turned off as well and I still receive the same error message.

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• Citrix on ESX 4 U1 - Slow login times

  - by thomps01

  I'm sure they'd be just as slow if not slower using ESX 3 but I'm looking for some assistance. On a physical Citrix server, logins are 1 - 4 seconds. The virtual - 16 - 23 seconds. I'm looking for performance enhancements that I can make to me VMs to try and reduce the login wait times. The hardware is fine (HP BL685 (24 cores, 64GB RAM). And there's nothing pushing it yet. Network 10Gb I'm planning to test the configuration with VMXNET3 tomorrow, but does anyone have a list a best practices I can use when testing?

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• Block unknown callers at work, but let them through if they try again [migrated]

  - by Blazemore

  I have Tasker for Android but I don't know enough about it to be able to implement this. I'd like this to occur when I am connected to a specific wireless network: If someone phones who isn't in my contact list, reject the call immediately (straight to voicemail). If they call again within a certain amount of time (say, 30 seconds) allow the call to come through. Frankly, I can't even get the first one working. I know it's possible. The time thing is a kind of added bonus

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• Can't turn off display - 13.10 / iMac

  - by user209883

  I can find no way to completely turn off the display on a late 2013 iMac running 13.10 (Saucy). In the power management settings, I configured the display to "turn off" after one minute to see what would happen. The dimness goes all the way down and everything disappears, BUT the LED backlight remains on. When I try the "xset dpms force off" command, absolutely nothing happens--the command is accepted (no error or warning), but nothing changes. I then wiped everything clean and installed 13.04 (Raring). Both methods (dpms and waiting for sleep) work perfectly there, so something has changed in this new version. The problem can be replicated simply by booting from a bootable USB stick. So, I also gave version 14.04 (Trusty) a try in this manner and it has the exact same issues as 13.10. P.S. I would gladly use 13.04, but the catch there is that I can not get the network card to function. I have spent a week now reading everything i can find on both of these matters with no luck at all. Thank you in advance for any advice.

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• Xubuntu 12.04: Slow Login

  - by naxchange

  I'm running Xubuntu 12.04, and after I ran the update, my login started slowing down big time. I've dabbled a little bit with the programs in Settings - Settings Manager - Session and Startup, and tried closing and opening these programs, and then rebooting. Anyways, I narrowed it down to a combination of 2 processes, "Network" (the connection manager) and "Xfce Volume Daemon". Their corresponding terminal commands are: ~$ nm-applet ~$ xfce4-volumed If I disable them, and then run them after login is complete, everything works just fine. Is there a way for me to run these commands automatically at start up? I want to maybe write a shell script and save it somewhere, or at least edit the order things happen after login, so the desktop can load before these processes. Hope I've been clear enough, and thanks in advance! NAX

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• VLAN help on ESX 4/vSphere

  - by user49032

  I setup a new VLAN with ID 153 in vSphere for my ESX4 server. The VLAN is setup for virtual machines and then I added a new NIC to the VM I want to be able to access the VM. The NIC is added to VLAN 153, but yet I am unable to ping the VLAN .1 IP that is setup on our Cisco 3750. The IP is properly setup on the Cisco 3750 because I'm able to ping the interface IP from other machines on the network. I'm guessing there must be an issue with the cabling. Any ideas?

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• I can't get an IP address from a VirtualBox VM on OSX from some routers (ie Internet cafes)

  - by ezrock

  On OSX 10.7.3, VirtualBox, using bridged adapter. Everything on the networking side works perfectly as expected in some networking environments, like my home router and some cafes. In others, I can't get an IP address over DHCP, and I don't know why. I suspect there is some setting on the router that is preventing me, or I have some issue with my MAC adress. When it's not working, in syslog, I'll see a few DHCPDISCOVER messages as my VM tries to find a DHCP server, and after a while, "No DHCPOFFERS received" And when I go to a "good" router, a simple "service network restart" is all I need to get an IP. Any ideas?

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• Server over VPN?

  - by zib_redlektab

  I don't know that much about VPN, so it could be that this is utterly impossible. Here's hoping, though. I would like to forward a port from my router to a machine connected to the network via VPN. That way, I could run a simple server on my laptop, and it would continue to work at the same address no matter where I am. The trick is that I don't want people connecting to the server to have to join the VPN. It should be completely transparent to the end-user. If it's not possible with VPN, is there some other technology that would make this possible? Basically just forwarding a port to a remote machine, one without a static IP.

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• Add/Remove script for local printer

  - by GxFlint

  I have a Windows XP machine that runs two applications and both print on a thermal printer connected by a serial port. For one application, the "Generic / Text Only" printer must be present, for the other to work I need to remove it. I've found a few .vbs scripts, but they are for network printer. How do I make them work with my local printer? Is there a better solution? The user would have to run the script every time he needs to switch from an application to another.

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• What are the reasons why outlook looses configurations?

  - by jnroche

  Can't seem to establish any logic why outlook suddenly looses its profile coniguration settings intermittently. I work for an IT Contact Centre but it hurts when someone asks me why they loose their outlook profiles suddenly, and some most of the time. I know there are lots of reasons but I'm not sure which ones are the best. Could it be that the PC in a hurge corporate organization will not be connected to the network properly so the profile gets corrupted for outlook? But they don't usually shut down the PC after office hours due to the fact that its a 24 hours operations. On top of that, when users are migrated to Windows 7 / Office 2010 and then logs on to this pc, then opens outlook, then logs off then goes back to a Windows XP PC and opens outlook 2003 the profile is again lost. Again why is this? Is there anyone out there whose facing same connection/outlook profile issues getting lost for no apparent reason?

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• Playbook is starting to get mail all of a sudden [closed]

  - by 1.21 gigawatts

  After 6 months my Playbook is just now this morning starting to pull in emails from my GMail account. Why? I didn't change anything on my end. The only difference I can think of (besides something changing on RIMs services end if that has any part in this) may be that I've been on a secure university connection for a few hours. I've been on this network before but the playbook doesn't seem to stay connected to it very long. Maybe it's because I have a lot of emails in my account? Has anyone else noticed this?

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• Oracle Database 11g Express Edition(XE)????~??????????????????????

  - by Yuichi Hayashi

  Oracle Database 11g (11.2.0.2)??????????????? Oracle Database 11g Express Edition(XE)?????????????Oracle Database????????(11.2.0.2)?????????????????????? v$version??11.2.0.2???????? ?????? Oracle Technology Network(OTN)????????????? http://www.oracle.com/technetwork/database/express-edition/downloads/index.html ???? XE?????????????????????? 1CPU????(???CPU???????????1CPU???????) 1???????1????????????????1DB???????????? ????????????11GByte?? ????????(RAM)?1GByte?? ????????????Windows(x86)???Linux(x86_64) Web???????????? Oracle 11g XE??????web??????????????????????? [??????????????] ??????????????????????????????????????????????Oracle Database?????????????????????????????????? [?????????????] ???????????SQL Developer????????SQL Developer???????????????????? ??????????? ?SQL Developer????~??????????????DB???SQL??? http://blogs.oracle.com/oracle4engineer/entry/sql_developersql Web?????????????? Oracle 11g XE????????Application Express???????????????????????????APEX????????????????APEX???????????????????????? APEX?????????????????????Oracle Application Express(APEX) - ??(??), ??, ??????????????? http://blogs.oracle.com/oracle4engineer/entry/cat_apex ?????? & ??????????? ????????????(DBA)??????????????????????·????????Oracle 11g XE??????????????????????????????????????????????????????&?????????????? [??????&?????????????] [???????????????RMAN(Recovery Manager)??????] ?????????????????????????Oracle Database??????????????????????Oracle 11g XE??????????????????????? ????Oracle???:Oracle Database 11g Express Edition(XE)??????????!

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• My server hostname doesn't work? [on hold]

  - by xSpartanCx

  I've got a raspberry pi running raspbian server edition. It's a modified debian that runs well on the rPi. My problem is that the only way I can ssh into it with putty is through the static ip. My router doesn't recognize the hostname; it shows the mac address as the name. This causes the pi not to show my website online (I think). The only way I've gotten it to work is using my other linux server to forward using virtual hosts, and that has to use the ip address, too. However, now that I have my other server off, the website doesn't work and I can't ssh (or find it anywhere on the network) using the hostname.

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• Oracle????????(2013?11?)

  - by Steve He(???)

    Oracle Support Training Oracle ???????????,????????????,??????,?????Oracle??????????,????????????????????????????????Oracle???????????? ???? ?? ?? ???? ?? My Oracle Support ?? ???????????????My Oracle Support????????????????,?????,?????????,??My Oracle Support??,?????????,????????,?????????? 11?7?14:00 ??  ??RACCheck?????RAC?? ???1?????????,????RACCheck????????????,????RACCheck ???????????,??RACCheck ????“11.2.0.3 Upgrade Readiness Feature”? ??,???????????,???????RACCheck ??? 11?13?15:00 ?? ????? ???????,??25??????5???Q&A??,????????????,???????,???????????,????????????????????? 11?14?14:00 ?? ??????????? ????????????????Oracle???????,???????????????????????Oracle????????SR??????? 30??????????My Oracle Support???????,???????????????????,?????????????????????,?????????????????????,?????Oracle????????????????????????????????? 11?21?14:00 ?? ????Enterprise Manager 12c?????Exadata ????????1??, ???Exadata????????Enterprise Manager Cloud Control???Exadata?????, ??Storage Cells, Network Switches, Computer nodes, and Cluster Database Services, ?????????????. 11?21?15:00 ?? Oracle?????? ??????????Oracle???????,???Oracle???????? ?30?????????????,??,?????????,????,???????????? 11?28?14:00 ?? ?????? My Oracle Support ??????????????????????,??? world clock.????????,?? Support Training Community ??????????

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• JavaOne SF??????????????!&????????

  - by OTN-J Master

  JavaOne 2012 San Francisco????????????????????????!??????????????????????????????????????????????????Java??????????????????????????? ??????????? JavaOne??????????????????YouTube?Java Channel?”JavaOne playlist”??????? ????? ???? ????????????????Oracle Media Network?”JavaOne 2012 channel”???????(??????·??????????????) ????????·?????/BOF/???????? ??????????????????????????JavaOne????????JavaOne Content Catalog??????????????????????????(???)??????????????????”Media”?????????????????????????????????????????????????? ??? ???????? ??? JavaOne???????????????????Oracle Days????????? ? ?????????????? ????????????????????????????????? 2012? Java????????? ??: 10?31?(?) 15:00-15:45??: ??????????? ????????1-4-1(????????????) ??:2012 ? 4 ? ????7?????? JavaOne ????? Java ????????????????????????????????? ???JavaOne 2012 ?????? Java ?????????????????????????????????????????? Java ??????????????????????????? ??: ??????????Fusion Middleware???? ????????????? Java?????????? ??  

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• ???: Oracle NoSQL Database??

  - by zhangqm

  ?????????Oracle?????Oracle NoSQL Database,?????NoSQL Database ??????????Oracle NoSQL Database??2???,Community Edition ?Enterprise Edition?????????NoSQL Database 11g R2 (11gR2.1.2.123). ?????????????????: Oracle NoSQL Database OTN portal (includes download facility) Oracle NoSQL Database OTN documentation Oracle NoSQL Database license information ??Oracle NoSQL Database ???????????,????,?????(key-value)???TB????,????????????(???)????,??????????????????????????,????,??????????? ?Oracle NoSQL Database?,???????????key-value???,??key???????:??????????key?(?????string),????????(??????????bytes)??????key-value ??primary key?hash?,????????????????????????????????,???????,????????????????????????? ???????????????????Java API??????Oracle NoSQL Database driver ????????,?????key-value????????????????Oracle NoSQL Database ?????Create, Read, Update and Delete (CRUD)??,???????durability??????????????????????:?????web console???command line??? Oracle Berkeley DB Java Edition Oracle NoSQL Database?? Oracle Berkeley DB Java Edition ????????,??????????????????????????????,?????????????????? ????????????Oracle NoSQL Database Driver?????key-value????????????Oracle NoSQL Database Driver??:?????????hash??????????????????,?????????????????????? ????????Oracle NoSQL Database Oracle NoSQL Database????????????????????????????????????????????????????????????????: ???? ???? ???? ?????? ???? ?????? ????,??,?? ???? ???? ??? (sub-millisecond) ???????? ????? ??????? ????????  ?????Oracle?????? ???? (Oracle Big Data Appliance) ???? ?????????????????????????????????,???“??”???????????,Oracle NoSQL Database???????????Oracle NoSQL Database?????(Cloud)??,????????(TB?PB??)???Oracle NoSQL Database ??????ETL??(??MapReduce, Hadoop)??,??acquire-organize-analyze ?????????? ???????Oracle NoSQL Database?????: • Large schema-less data repositories• Web?? (click-through capture)• ????• ????• ?????????? • Sensor/statistics/network capture (?????, ?????)• ?????????• ???? (MMS, SMS, routing)• ???? Oracle NoSQL Database (Community Edition ??)??????????? Oracle Big Data Appliance???

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• ??OSW (OSWatcher Black Box) ????

  - by Feng

     OSWatcher Black Box, ??OSW,?oracle???????????????,?????OS??????????OS??????????,??CPU/Memory/Swap/Network IO/Disk IO?????? +++ ????????OSW? OSW?????????,????????????????,???mrtg, cacti, sar, nmon, enterprise manger grid control. ????OSW?????: 1. ???????,???????2. ???????,????CPU,???????????3. ???????,????????????????????????OS? ???????OS???,??OS?????,?????????????;??????????????????????,???????. ???????,????????:?????????,??????????,????????????(root cause),?????????????????????????,OSW??????,??????: 1. ??????????OS??????????????????????????OSW??,?????????OS??,??????DB/???? 2. ??ORACLE Database Performance???,?????????????OS??????OS?????????????Swapping,???????????????,?????????,???AWR?????????latch/mutex?????? 3. ??????????????AWR??????????,top5??????????;?CPU,??,Swap, Disk IO?????????????OSW??????????,????????????????????????OSW???,??????????????? 4. ?????ORA-04030?????CJQ0, P00X, J00X?????????,???????OSW,???????????????????OS????????? 5. ????server process??hung?,??????OSW????????????????suspend???,?????????CPU/Memory? 6. ??Listener hung???,?????OSW??????????????? 7. Login Storm??:????????????,????,????ASH,AWR????????????????OSW?ps?????,??????, oracle ?server process????????? ???,OSW????????????????????OS?????????????,??????DBA???OSW??????????????OSW,????DB Performance????,????????OSW???? +++ ?????OSW??????: 1. ??????????????,???????,???????? 2. OSW???????? OSW??????????????OS???????,??ps, vmstat, netstat, mpstat, top;????????????????? ?????????CPU, Disk IO, Disk Space, Memory;???????????????,??????????????????????????,??OSW????????:?????????,CPU????90%??;???free space???????????????????????????,??OSW????????? +++ ????????UNIX/LINUX???/??OSW: 1. ???301137.1???OSW 2. ????????(/tmp??),??????????root?? $ tar xvf osw.tar 3. ?? $ nohup ./startOSWbb.sh 60 48 gzip & ????????,??OSW,????60???????,???????48?????(??????????),???????gzip?????? 4. ????? $ ./stopOSWbb.sh ?????????archive???? ????????????????????OSW???????,???????

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• ??Oracle ???????

  - by Steve He(???)

  ?????? ??????Oracle Configuration Manager (OCM)????, ????????,?????2?????????????????,?????????????????????????,?????????My Oracle Support?Oracle??????????,???????????????????,??????????? Oracle?????????,?????????????????????????????????????,OCM??????Oracle??????????? ?????????,Oracle????????????????????????My Oracle Support????? ??????,Oracle??????????????????,?????????????????????My Oracle Support?????OCM???,????????????????Oracle?????????????,???????????????????????????,??????????????????,????????????????,???????????,????????????????????Oracle???????,??????????,???????????????????????????,?????????????? ???????? ???????????????,????????????????????????My Oracle Support,??“Collector” ??????????????????“Collector”????,??“More”???????“Collector”????,???????????????????????????????????????????????????????????,??FTP????(ZIP)???PC??Oracle??????????????????????,??$ORACLE_HOME??,???????????????,???????????????????????? My Oracle Support ???(?????,??????) Proxy??(??IP??,???,??????) ???? ?My Oracle Support?????zip????? $Oracle_Home  ????My Oracle Support ???zip?? – ?????CCR???????????? ?????? “$ORACLE_HOME/CCR/bin” ,?????? “setupCCR” ???? My Oracle Support ??(?????,??????) ??????????????                                      ???? ?????  ??,???????,????????????Oracle home????????????????????Oracle??????,EBS,?Enterprise Manager?????,???? Installation and Administration Guide ?????My Oracle Support????????? ?My Oracle Support????? Oracle Configuration Manager Installation and Administration Guide [ID 728989.5] Oracle Configuration Manager Prerequisites [ID 728473.5] Oracle Configuration Manager Network Connectivity Test [ID 728970.5] Oracle Configuration Manager Collection Overview [ID 728985.5] Oracle Configuration Manager Security Overview [ID 728982.5] Oracle Software Configuration Manager: Disconnected Mode Collection [ID 453412.1]  

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• Creating a Reverse Proxy using Jpcap

  - by Ramon Marco Navarro

  I need to create a program that receives HTTP request and forwards those requests to the web servers. I have successfully made this using only Java Sockets but the client needed the program to be implemented in Jpcap. I'd like to know if this is possible and what literature I should be reading for this project. This is what I have now by stitching together pieces from the Jpcap tutorial: import java.net.InetAddress; import java.io.*; import jpcap.*; import jpcap.packet.*; public class Router { public static void main(String args[]) { //Obtain the list of network interfaces NetworkInterface[] devices = JpcapCaptor.getDeviceList(); //for each network interface for (int i = 0; i < devices.length; i++) { //print out its name and description System.out.println(i+": "+devices[i].name + "(" + devices[i].description+")"); //print out its datalink name and description System.out.println(" datalink: "+devices[i].datalink_name + "(" + devices[i].datalink_description+")"); //print out its MAC address System.out.print(" MAC address:"); for (byte b : devices[i].mac_address) System.out.print(Integer.toHexString(b&0xff) + ":"); System.out.println(); //print out its IP address, subnet mask and broadcast address for (NetworkInterfaceAddress a : devices[i].addresses) System.out.println(" address:"+a.address + " " + a.subnet + " "+ a.broadcast); } int index = 1; // set index of the interface that you want to open. //Open an interface with openDevice(NetworkInterface intrface, int snaplen, boolean promics, int to_ms) JpcapCaptor captor = null; try { captor = JpcapCaptor.openDevice(devices[index], 65535, false, 20); captor.setFilter("port 80 and host 192.168.56.1", true); } catch(java.io.IOException e) { System.err.println(e); } //call processPacket() to let Jpcap call PacketPrinter.receivePacket() for every packet capture. captor.loopPacket(-1,new PacketPrinter()); captor.close(); } } class PacketPrinter implements PacketReceiver { //this method is called every time Jpcap captures a packet public void receivePacket(Packet p) { JpcapSender sender = null; try { NetworkInterface[] devices = JpcapCaptor.getDeviceList(); sender = JpcapSender.openDevice(devices[1]); } catch(IOException e) { System.err.println(e); } IPPacket packet = (IPPacket)p; try { // IP Address of machine sending HTTP requests (the client) // It's still on the same LAN as the servers for testing purposes. packet.dst_ip = InetAddress.getByName("192.168.56.2"); } catch(java.net.UnknownHostException e) { System.err.println(e); } //create an Ethernet packet (frame) EthernetPacket ether=new EthernetPacket(); //set frame type as IP ether.frametype=EthernetPacket.ETHERTYPE_IP; //set source and destination MAC addresses // MAC Address of machine running reverse proxy server ether.src_mac = new MacAddress("08:00:27:00:9C:80").getAddress(); // MAC Address of machine running web server ether.dst_mac = new MacAddress("08:00:27:C7:D2:4C").getAddress(); //set the datalink frame of the packet as ether packet.datalink=ether; //send the packet sender.sendPacket(packet); sender.close(); //just print out a captured packet System.out.println(packet); } } Any help would be greatly appreciated. Thank you.

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