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  • Meaning of Bridge-Check in iptables flowchart

    - by networkIT
    In the famous iptables flow-chart what does bridge-check exactly stands for ? I couldn't find any documentation. The only clue I found was while scanning the MikroTik RouterOS documentation ( RouterOS is build upon a Linux 2.6.16 kernel ), I found this : In-interface Bridge = Checks if the input interface is a port for a bridge or is the bridge. Manual:Packet Flow Comparing both flow-charts brings clues that iptables Bridge-check might equal MikroTik In-Interface Bridge. Is this true ? Else, what might be the meaning of iptables Bridge-Check ?

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  • When can an FTP server close its passive connections?

    - by Don Kirkby
    Does the FTP protocol allow the server to close any of its passive connections while the client is still connected? Can it tell when the client is finished receiving and then close the connection? I'm including an FTP server in my application using the pyftpdlib Python project. I've got it to work in active and passive mode, but I'm a bit concerned about when it closes its passive connections. I've tried connecting to it with both FileZilla and the default ftp command in Ubuntu, and in both cases, I get a new passive port for every request. That is, if I sit in the root folder and type ls 10 times, I use up 10 ports. This means that I have to allocate a big block of passive ports for the FTP server to use so it won't run out. As soon as the client disconnects, the server releases all the passive connections associated with that client and those ports can be reused. However, a long-running connection could use up a lot of ports.

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  • Exchange 2003 SMTP SSL and various email clients

    - by FrancisV
    This Exchange 2003 server sits behind a firewall with a virtual SMTP server listening on port 465 and attached an SSL certificate from Comodo to the virtual server. However, when trying to send from Apple Mail.app 4.x and Outlook 2011 for Mac, it never completes the connection (time out). Oddly though, the same setup works with Thunderbird. My question is: Does it matter if the friendly name of the certificate is different from the internal hostname? The machine has 2 hostnames: external and internal. The official SSL is using the external name. When using a self-signed certificate with the same name as the internal, I still can't send from the Mail.app and Exchange clients but I can with Thunderbird.

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  • Using PVLANs with normal VLANs in a trunked environment

    - by user974896
    Assume a trunked environment with two switches, S1 and S2. The swtiches are connected with a trunk port designed to pass VLAN 26. What would happen if VLAN 26 on S2 is configured as a private-vlan with the default gateway and DHCP server and default gateway as promisc ports. What if S1's VLAN 26 is configured as a standard VLAN. Would the hosts on S1 be able to communicate with the promisc ports on S2? Would they be able to communicate with the hosts on S2? To further complicate things what if the DHCP server were to reside on S1 and I wanted S2 to have private VLANS with promisc ports as the gateway and DHCP server while still leaving S1 in a standard vlan configuration.

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  • I can't get my Macbook Pro to print to an IP addressable printer

    - by Pieter
    Running Macbook Pro OS X 10.6.3 Accessing an HP OfficeJet 5610 plugged in the USB port of a US Robotics router. I tried several combinations of: Protocol: Internet Printing Protocol (IPP) Line Printer Daemon (LPD) HP JetDirect (socket) Address: http://192.168.1.10:1631/printers/HP5610 192.168.1.10:1631/printers/HP5610 http://192.168.1.10:1631 192.168.1.10:1631 192.168.1.10 ... Driver: HP OfficeJet 5600 Series Whenever I try to print, it fails while saying "connected to printer" or "Printer is busy...zill try again in X seconds" Both Windows 7 and Windows XP computers on the network can successfully access this printer, identifying it as "HP5610 on http://192.168.1.10:1631/" I tried clearing all tasks and printers (ctrl-click in the menu), and resetting it to (socket, http://192.168.1.10:1631/printers/HP5610, HP5600 series) but to no success.

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  • Is there a way to control two instantiated systemd services as a single unit?

    - by rascalking
    I've got a couple python web services I'm trying to run on a Fedora 15 box. They're being run by paster, and the only difference in starting them is the config file they read. This seems like a good fit for systemd's instantiated services, but I'd like to be able to control them as a single unit. A systemd target that requires both services seems like the way to approach that. Starting the target does start both services, but stopping the target leaves them running. Here's the service file: [Unit] Description=AUI Instance on Port %i After=syslog.target [Service] WorkingDirectory=/usr/local/share/aui ExecStart=/opt/cogo/bin/paster serve --log-file=/var/log/aui/%i deploy-%i.ini Restart=always RestartSec=2 User=aui Group=aui [Install] WantedBy=multi-user.target And here's the target file: [Unit] Description=AUI [email protected] [email protected] After=syslog.target [Install] WantedBy=multi-user.target Is this kind of grouping even possible with systemd?

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  • PDAnet on Android IP on PC is not public IP. Where does the NAT take place, PDAnet or Verizon?

    - by lcbrevard
    When using PDAnet on a PC (Win7 ultimate) to USB tether a Motorola Droid on Verizon 3G the IP address of the PC appears to be public - 64.245.171.115 (64-245-171-115.pools.spcsdns.net) - but connections show as coming from another public IP - 97.14.69.212 (212-sub-97.14.69.myvzw.com). Someone is performing Network Address Translation - either PDAnet or within the Verizon 3G network. Can someone tell me who is doing the NAT? Is it PDAnet or is it at Verizon? Is there any possibility of setting up port forwarding, such that connections to the public IP 97.14.69.212 (212-sub-97.14.69.myvzw.com) are forward to the PC? We are testing a network protocol that requires either a true public IP or forwarding a range of ports from the public Internet to the system on which the software runs (actually Linux hosted by VMware Player or Workstation on a PC running Windows).

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  • HP DV5T laptop problems using Adobe in multiple monitors

    - by Rolnik
    I have a dualview arrangement of two monitors that works just fine for 90% of my applications. However, any time I open Adobe Acrobat Reader to the larger monitor, it fails to permit enlarging of the window to fill the entire screen. In other words, it seems Adobe crops the PDF view at about the size of the smaller of the two monitors, despite Acrobat being present in the larger monitor. I'm using nVideo graphics on the laptop, and connecting to the larger monitor through the docking port of a docking station. Any ideas how to get the Acrobat to be aware that it has more screen real-estate and use it fully?

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  • How to Access an AWS Instance with RDC when behind a Private Subnet of a VPC

    - by dalej
    We are implementing a typical Amazon VPC with Public and Private Address - with all servers running the Windows platform. The MS SQL instances will be on the private subnet with all IIS/web servers on the public subnet. We have followed the detailed instructions at Scenario 2: VPC with Public and Private Subnets and everything works properly - until the point where you want to set up a Remote Desktop Connection into the SQL server(s) on the private subnet. At this point, the instructions assume you are accessing a server on the public subnet and it is not clear what is required to RDC to a server on a private subnet. It would make sense that some sort of port redirection is necessary - perhaps accessing the EIP of the Nat instance to hit a particular SQL server? Or perhaps use an Elastic Load Balancer (even though this is really for http protocols)? But it is not obvious what additional setup is required for such a Remote Desktop Connection?

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  • how to change the default open-with program to a program on the second disk

    - by Scott????
    I have a 250GB HDD for my system and a 60GB SSD using a SATA port. I installed most of my applications on the SSD. There's a strange thing though. I can not change the default open-with program to a program which is on the SSD. I think it may be caused by permission so I gave my user a 'full control' permission on the security tab in disk properties. But changing permissions is not work. After I choose an application (I've tried Notepad++, Sublime, 7Zip, etc.), nothing is added in the below window: Also, if I install 7Zip on my machine, the right click menu items can not be added.

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  • Terminal Server 2003 Gaining Time when Windows 7 Client Connects

    - by Matthew
    A Windows 2003 Terminal Server keeps time perfectly until a Windows 7 Home client connects. Then it gains time at a rate of several seconds per minute. The client connects through a firewall with only the RDP port open. The client runs the same apps on the terminal server that XP clients run with no issues. Using the Microsoft Terminal Server Client application copied to the W7 computer from an XPsp3 computer gives the same results. Current workaround is to sync time every 5 minutes. Any better ideas?

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  • USB keyboard not recognized by motherboard with only a legacy PS/2 header

    - by Luis
    I've bought a D945GSEJT Atom motheboard that has three usb ports available and no PS/2 connector, just a PS/2 header. I have a PS/2 keyboard with a PS/2 to USB adapter and connected it to a USB port. I tried all three USB ports. The problem is that the board seems to not recognize my keyboard. None of the keys I press are detected by the system. I've read that maybe I could try to change BIOS USB settings to solve this detection problem. But how can I do it if I can't type anything? Is there any other option other than buying a PS/2 adapter and plug it to the PS/2 header?

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  • Has ec2 made self-hosting possible for 'amateur' sysadmins possible?

    - by Blankman
    I'm a developer, and it seems ec2 has made it possible for a amateur sysadmin like me to setup and maintain a fairly large set of servers. Now I don't mean to undermine real sys admins, as I know the value of them but what I am trying to get at is that someone like me can setup and maintain a cluster of servers (front end web servers, with some db servers) using tools like ec2 and capistrano with the help of google. Now this isn't something I would do as a long term thing, but as a startup, one-man operation, I think I can pull this off until business takes off and I can hire this important role out. With ec2, I get my firewall, so I basically open up port 80 on my public facing server, which will run haproxy and route requests to my cluster of servers. Ofcourse I am simplifying the setup, but just want a feel for what you guys think about my perception. My application is a web application, that will be runing Ruby on rails (passenger) and talking to mysql or postgresql.

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  • Setting up Mac VPN on simple network with separate IPs

    - by Dave
    Hi there, We have a pretty simple network configuration. A typical ASDL line with two extra IP addresses. We have a basic home network router Dlink DIR-655. We have two Mac OS X Snow Leopard Servers that we want to setup VPN on. The problem is that we can't change the ports which VPN works under ie. we can only setup port forwarding for UDP 500,1701,4500 to a single server. I'm wondering how we can cost effectively re-work our network so that we can take advantage of the separate IP addresses and have both VPNs working with the same router. Is that possible with our current hardware setup or do we need something more powerful? We're also toying with Mobile Access and wondering if that might be easier to setup. Expert help is greatly appreciated.

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  • Installing php(suexec) for Apache

    - by John
    I've got Apache installed and running but how do i install and run PHP as fastcgi so it runs as its own user? here is my apache config: ./configure --prefix=/usr/local/apache2 --enable-rewrite=shared --enable-so --enable-suexec --disable-asis --disable-autoindex --enable-cache --enable-deflate --enable-disk-cache --enable-expires --enable-file-cache --enable-mem-cache --enable-ssl --enable-vhost-alias --with-mpm=prefork --with-port=8080 here is my php config: ./configure prefix=/usr/local/php --without-pear --enable-safe-mode --enable-magic-quotes --with-apxs2=/usr/local/apache2/bin/apxs --disable-cli --disable-cgi --enable-force-cgi-redirect --enable-fastcgi --with-mysql --with-gd --with-jpeg-dir=/usr/lib --with-png-dir=/usr/lib --with-freetype-dir=/usr/lib --enable-calendar --with-curl --enable-mbstring --with-mcrypt

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  • Mini DV and DVI Conversion

    - by Kairan
    Video card is: AMD HD 6950 My video card comes with 1xHDMI, 2xDVI, and 2xMini DV ports. I have always used VGA and DVI only. I have the HDMI already connected. I want to hook up 2 more display. One of the display can take a VGA only, the other is an LCD TV so it has VGA, HDMI, Component. I am wondering: 1) What is the best output port to use for the second two monitors? The miniDV or the DVI? 2) I need to run a long cable maybe 15-25 feet, this might change the answer to question 1, is an HDMI long cable 20+ ft going to be better than a 20ft DVI or miniDV ?

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  • DVI-D Splitter Not Working with GeForce 8400gs

    - by jimdrang
    I have a GeForce 8400gs and it has a DVI and VGA port on the back. I was using dual monitors with one VGA and one DVI cable. I wanted both displays to be digital so I bought a DVI-D splitter and put one DVI cable in each monitor, connected them to the splitter and put the single merged connection in the back of the cards DVI connection. It will not recognize the second monitor (I'm not even sure how it determined which one was the first monitor). The tech specs state that it supports "Two dual-link DVI outputs for digital flat panel display resolutions up to 2560x1600" http://www.nvidia.com/object/geforce_8400_tech_specs.html. Do I need a different converter or is my only option for dual monitors with this card one VGA, one DVI?

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  • Node.js apps and wordpress on the same vps

    - by Msencenb
    So currently my linode (ubuntu 11.10) serves up three node.js apps for me using connect's vhost middleware listening on port 80. Here is an example of how vhost sets up a domain: var portfolio = require('./bootstrap-portfolio/lib/app.js'); var server = express(); server.use(express.vhost('sencedev.com',portfolio)); server.use(express.vhost('www.sencedev.com',portfolio)); server.listen(80); However I would now like to add a wordpress installation to my vps as well. In the past for me this has meant a traditional apache installation; however I'm a bit unsure of how node.js + a different webserver (apache or nginx) should interact. Any thoughts on how I should approach hosting wordpress + node.js on the same box?

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  • Connecting to Windows 7 from fedora is slow

    - by user44212
    I use rdesktop command to connect to windows 7 machine remotely but I get a very slow reponse when I try and connent to it. The command that I used to connect to it is rdesktop -4 -C -x -b : -g 100% 192.168.1.100. I have tried using the rdesktop command to connect to the console port as well but the result is the same. I have even tried using the Terminal server client application the result is the same. I am trying to connect from fedora 14 machine to windows 7 professional is there any tweaking that needs to be done to overcome this issue either on fedora or Windows 7.

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  • Running a VM off of an external HD via USB

    - by Nelson LaQuet
    Is it viable to run (i.e. reference the vmx/vhd directly from the mounted drive) a VM (vmware running Windows Seven) off of an external HD via USB? I mean, I know it's possible, but I guess I'm asking if USB provides enough bandwidth for normal usage... If so, are there any particular brands that may be better or worse? I know that ESATA would be a more viable setup, but my laptop doesn't have an ESATA port. Currently I use the VM to segregate all of my work development servers and software from my main machine; so I will be running all development servers and tools on the VM directly.

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  • vps running out of memory, 200MB free

    - by demon
    At the beginning of this year I took a VPS for my website because I was running against the resource limits from a shared hosting. Here are the things I know: 2GB memory, with 1GB swap Debian X64 server ED installed Software running on the webserver: mysql apache postfix pop3 imap amavisd clamd cron fail2ban munin-node pure-ftpd spamd nginx Now for the setup: Nginx listens on port 80 and handles the static files, the php side is done by apache2 running mod_php in combi with apc(no var caching!). Iam using a pretty 'busy' drupal and phpbb stack on the server, for drupal iam using boost and authcache to handle of the server load with a pressflow stack. phpbb is just phpbb3 with some mods installed, but has at max 30 users online at a time.. The problem is that its staring to use the swap after a few days after a reboot and thus the site becomes slower. I'v added pictures of monit and munin, so maybe somebody can help me out... Monit: Munin:

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  • embedded tomcat 7 behind iis 7.5 proxy ssl problems

    - by user1058410
    I'm using embedded tomcat 7 behind a iis 7.5 proxy server, with requests being forwarded to tomcat with arr. Everything works fine unless iis is set to require ssl. Then things like links that are generated dynamically in .jsp files on tomcat don't work right. For example if a link is supposed to point to _https://somewhere.com:443 it will be wrote as _http://somewhere.com:8080 (8080 is the port tomcat is running on). The problem seems to come from when tomcat looks at itself to build out the url it sees correctly that it is running on _http://somewhere.com:8080, but i need it to think otherwise. Does anybody know how to accomplish this without using ssl between iis and tomcat? Sorry for the underscores in front of the imaginary urls.

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  • How to calculate required switch speed based on network usage?

    - by tobefound
    I have a 48 port HP Procurve Switch 2610 (J9088A) that can handle 13.0 million PPS (packets per second) and features wire speed switching capacity at 17.6Gbps. First off, what does that REALLY mean? Where do I start when trying to figure out if my office (with 70 employees) will be well setup with this switch? How to calculate through-put based on a user average load of X MB per day? 90% of the folks will only be sending email, access random websites, etc... the other 10% will be conducting heavier tasks like moving image files (10 MB) across network shares, constant external FTP streams through the switch to a server etc... Is this switch good enough?

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  • Azure VM : Connection refused by host

    - by Simon Kérouack
    I recently stopped a subscription with 14 VMs in it and restarted it a few days later. Now all my VMs are working just fine at the exception of 6 used for MongoDB. They respond to ping and so they show as online in the azure dashboard but they do not answer to anything else. I tried (from different locations, in and out of the azure cloud) ssh : connect to host * port *: Connection refused telnet : Unable to connect to remote host: Connection refused mongo : exception: connect failed The ports for ssh and mongo are opened in azure. I tried restarting the VMs a few times trough the azure dashboard, they seem to restart successfully but still refuse all connections. I already looked for similar issues and the best solutions I found was to wait... the issue has been happening for 7 days and waiting is no more an option.

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  • Cloud services can't be reached from complex customer infrastructure

    - by Nock
    We have several services running on a cloud, they all are hosted on Windows Server 2012 R2, have public IP address and specific port. Some of our customers can't reach them because for "some reason" the ports are cut between a firewall between them and us. (some customers are using a shared internet connection in a multi tenant office and they can't change firewall communication) Well, you get it, we don't have the possibility to make all the firewall "allowing" the communication. My customers all runs Windows 7 at least. What is the best counter solution in such case, using Microsoft (Windows Server) technologies? The best would be some kind of tunneling communication or VPN, but the customer should also be able to access his/her enterprise resources. Bby the way, today we using IPSec using Windows Firewall to secure the communication, is IPSec tunneling a solution for us? Otherwise, is there a service in Windows to enable some kind of VPN between a client and a server but only for a given set of servers?

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