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• How to tell Windows 7 to ignore a default gateway

  - by zildjohn01

  I currently have 2 network cards in my PC -- one connected to an internal network on a router with a disconnected WAN port (10.x.x.x), and one connected to the internet through a consumer router (192.168.0.x). Windows seems to recognize them correctly (my "Network and Sharing Center" lists them as "No Internet" and "Internet" respectively), however when I try browsing the internet it always tries the internal network's default gateway, rather than the one with internet access. Trying to ping a website results in "Reply from 10.0.0.1: Destination net unreachable.". A simple "route delete 0.0.0.0 mask 0.0.0.0 10.0.0.1" fixes the problems, but they return upon reboot, or upon renewing my IP. Is there any way to tell Windows to ignore one NIC's default gateway, or to at least give them priorities?

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• Creating an office network and monitoring all activity without a proxy

  - by Robert

  We are setting up our office network and would like to track all the websites visited by our employees. However, we would not like to use any proxy based solutions. Our work is highly dependent on applications in which you cannot configure a proxy. Hence, the approach we would like to follow is setting up a router inside a computer (something like this : http://www.techrepublic.com/article/configure-windows-server-2003-to-act-as-a-router/5844624) This will also allow us to attach multiple ethernet cards and have redundancy in internet connectivity with complete abstraction from the user about which connection is being used. But most importantly, since all the traffic will be going through the computer (configured as a router) I assume there will be a way to run packet analysis on all the request / responses being made. For example, list all the FTP servers connected to (port 21), give a graph of all the URLs visited per day by frequency. Is there already a software which does this ? Or is it possible to build something like this ?

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• What tangible security are gained by blocking all but a few outgoing ports in a firewall

  - by Frankie Dintino

  Our current hardware firewall allows for blocking incoming and outgoing ports. We have two possibilities: Block certain troublesome ports (unsecured smtp, bittorrent, etc.) Block all but a few approved ports (http, https, ssh, imap-ssl, etc.) I see several downsides with option 2. Occasionally web servers are hosted on non-standard ports and we would have to deal with the resulting issues. Also, there is nothing preventing a malicious or unwanted service from being hosted on port 80, for instance. What are are the upsides?

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• SATA 3 PCIe Controller working with decreased performance (slower than SATA 2)

  - by V M

  After reading this question about maxing out an SSD I decided to do so myself. My mobo only supports SATA 2 and has two PCIe 2.0 x1 connectors (which promiss up to 500 mb/s). So after some searching I decided to go with this controller from amazon. My Samsung magician benchmark before upgrade (running SATA 2): Now after installing the controller all of the benchmark scores are lower (even though the Samsung Magician app confirms its connected to a SATA 3 port): What can I do to remedy this? Any help is appreciated.

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• Enable Server Status using Plesk 11

  - by Lars Ebert

  I am trying to get apaches server status to work with Plesk 11. But running sudo /usr/sbin/apache2ctl fullstatus results in: Forbidden You don't have permission to access /server-status on this server. __________________________________________________________________ Apache Server at localhost Port 80 'www-browser -dump http://localhost:80/server-status' failed. Maybe you need to install a package providing www-browser or you need to adjust the APACHE_LYNX variable in /etc/apache2/envvars How can I enable server status? So far I have tried to insert <Location /server-status> SetHandler server-status Order Deny,Allow Deny from all Allow from localhost </Location> into the httpd.conf, but I am not sure if it is active. I also tried adding it to /var/www/vhosts/somedomain/conf/vhost.conf but I do not know which domain I have to add this to, as fullstatus seems to query localhost directly. I guess I am a little confused by the use of vhost configuration in Plesk.

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• Visual SVN server Running but cannot access / browse repositories

  - by user1783560

  Operating System: Windows Web Server 2008 R2 Visual SVN Version: 2.5.7 Subversion: 1.7.7 Apache: 2.2.22 I freshly installed the Visual SVN latest version on the server and created one repository in it. In the server management window, it shows that the server is up and running but when I try to browse it in a web browser, it doesn't respond. I am not able to import my existing code into the repository: Error: Cannot connect to server open/browse the repository with either command localhost:81/svn OR http://www.myserver.com:81/svn OR http:// myIPAddress:81/svn Visual SVN log is clean. The last information in the server log is that "The server is listening to port 81.

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• Changing linksys router configuration from command-line

  - by Dan

  I am constantly logged into (ssh'd) my home machine (ubuntu) from various remote locations. Sometimes I would like to change my home linksys router settings (change the port forwarding settings or disable/enable wireless, things like that). When I try and use the links2 text browser, there isn't much I can do because the tab titles don't show up (presumably because they are pictures?). Is there another way of configuring a linksys router from a command line? I guess my only other option is to set up a proxy on my home machine and use a browser connected to that proxy to configure it, but I would think there might be a non-browser way of doing it. Thanks

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• Bridge virtual machines out WLAN interface

  - by Thomas

  It seems that my wlan card (intel 5100 AGN) firmware doesn't allow "spoofing" MAC addresses. This has the side effect of destroying the capability to bridge out my virtual machines on that interface. Apparently this is a common thing on wlan cards. I can see the incoming traffic just fine in my virtual machines, but their DHCP queries don't get bridged out of the WLAN card. It works perfectly well when using the wired ethernet port. Is there a workaround for this? MAC-NAT or something? I don't want to route my virtual machines out to the Internet because I don't want my host OS to even have an IP address. I'm using Linux and KVM for virtualization.

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• How does Router know where to forward packet

  - by kornelijepetak

  If several computers with local addresses (192.168.0.#) are connected to a router and each computer opens a web browser and requests a page over HTTP, when these TCP:80 packets are sent out, the router switches the local address with the static IP of the router (i.e. Provider given IP) so the server can reply to the appropriate address. But how does the router know to which computer to forward the HTTP reply, since the TCP header does not contain the local IP address (does it?), and all computers are using port 80? Does this have anything to do with the MAC addresses? How exactly does this work?

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• How to give virtual machine access to the Internet, but block from LAN?

  - by Pekka

  I am setting up a virtual machine using Microsoft Virtual PC in Windows 7. The VM will run a Windows XP. I want to set up a public-facing server in it for web pages, subversion and other things, and instruct the router to port forward any requests to that Virtual Machine. I managed to do that - I assigned the VM to the network adapter, and it is now acting as just another DHCP client - but to increase security I would like to block the VM from the rest of the LAN, so it accepts only incoming connections from the Internet. For this to be effective in case of a compromise, it would have to happen on VM level as far as I can see. Can this be done?

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• IIS exclude specific host?

  - by chakrit

  I have an IIS server running several websites. It is stationed behind an ISA server of which I do not have access. But I do have all of the defined websites (on port 80) routed to my server. So I want to take down one website, say it's foo.bar.com and in its place setup a LAMP server instead using a VM software. It needs to run alongside all the existing websites and it should not interfere with them. I have full control over my server, but not the ISA. Is this possible? If so, how? The OS is Win Server 2003 Standard with IIS6

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• How can I fix my Virtual PC 2007 network configuration

  - by DanJ

  Hi, I have installed Windows Virtual PC 2007 on my Windows 2003 R2 Server. I have installed a virtual Windows XP. I have configured the virtual PC to use Shared Networking (NAT) I have disabled the firewall on the virtual windows XP The problem: I am unable to PING from Windows 2003 (the host) to the Windows XP (virtual) I do have normal traffic from the virtual to the internet Could this problem be related to routing? How I can I fix this network configuration to allow for the following traffic: 1. From Virtual to Internet 2. From Host to Virtual 3. If possible, from Internet to Virtual on pre-defined ports (port forwarding?) Thanks

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• failing to achive tunneling to fresh ubuntu 10.04 server

  - by user65297

  I've just set up a new 10.04 server and can't get the tunneling to work. local machine > ssh -L 9090:localhost:9090 [email protected] login success, but thereafter trying tunnel from local browser, http://127.0.0.1:9090 echo at server terminal: channel 3: open failed: connect failed: Connection refused auth.log sshd[24502]: error: connect_to localhost port 9090: failed. iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Trying 9090 at server (links http://xx.xxx.xx.xx:9090 works) sshd_config is identical to previous 8.04 server, working fine. What's going on? Thankful for any input. Regards, //t

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• Can't connect using Jail SFTP account

  - by Fazal

  I've been following this tutorial "Limiting Access with SFTP Jails on Debian and Ubuntu" and whilst I've had no errors setting it up, I've had issues on Ubuntu 10.04LTS logging in as a user on a virtualhost. I've changed my SSH port to 22022, and enter all the credentials when attempting to login. I ran these commands to add a user to the virtualhost: # useradd -d /srv/www/[domain] [username] # passwd [username] # usermod -G filetransfer [username] # chown [username]:[username] /srv/www/[domain]/public_html I should add that this is the only time I've setup the user they have no other /home directories or such. The directory that does exist is at /srv/www/example.com/public_html When I try using a desktop package such as cyberduck to login to the site, I keep getting a "Login failed with this username or password". I am completely lost as what to do next... The reason why I'm trying this method is because I want my clients to use SFTP and not FTP to upload files to their websites. Any help or direction is appreciated.

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• Routing to various node.js servers on same machine

  - by Dtang

  I'd like to set up multiple node.js servers on the same machine (but listening on different ports) for different projects (so I can pull any down to edit code without affecting the others). However I want to be able to access these web apps from a browser without typing in the port number, and instead map different urls to different ports: e.g. 45.23.12.01/app - 45.23.12.01:8001. I've considered using node-http-proxy for this, but it doesn't yet support SSL. My hunch is that nginx might be the most suitable. I've never set up nginx before - what configuration do I need to do? The examples of config files I've seen only deal with subdomains, which I don't have. Alternatively, is there a better (stable, hassle-free) way of hosting multiple apps under the same IP address?

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• set proxy for vpn server on ubuntu server 12.4

  - by Morteza Soltanabadiyan

  I have a vpn server with HTTPS, L2TP , OPENVPN , PPTP. i want to set proxy in the server so all connection that comes from vpn clients use the proxy that i set in my server. I made a bash script file for it , but proxy not working. gsettings set org.gnome.system.proxy mode 'manual' gsettings set org.gnome.system.proxy.http enabled true gsettings set org.gnome.system.proxy.http host 'cproxy.anadolu.edu.tr' gsettings set org.gnome.system.proxy.http port 8080 gsettings set org.gnome.system.proxy.http authentication-user 'admin' gsettings set org.gnome.system.proxy.http authentication-password 'admin' gsettings set org.gnome.system.proxy use-same-proxy true export http_proxy=http://admin:[email protected]:8080 export https_proxy=http://admin:[email protected]:8080 export HTTP_PROXY=http://admin:[email protected]:8080 export HTTPS_PROXY=http://admin:[email protected]:8080 Now , i dont know what to do to make a global proxy for server and all vpn clients use it automatically.

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• Setup routing and iptables for new VPN connection to redirect **only** ports 80 and 443

  - by Steve

  I have a new VPN connection (using openvpn) to allow me to route around some ISP restrictions. Whilst it is working fine, it is taking all the traffic over the vpn. This is causing me issues for downloading (my internet connection is a lot faster than the vpn allows), and for remote access. I run an ssh server, and have a daemon running that allows me to schdule downloads via my phone. I have my existing ethernet connection on eth0, and the new VPN connection on tun0. I believe I need to setup the default route to use my existing eth0 connection on the 192.168.0.0/24 network, and set the default gateway to 192.168.0.1 (my knowledge is shaky as I haven't done this for a number of years). If that is correct, then I'm not exactly sure how to do it!. My current routing table is: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface MSS Window irtt 0.0.0.0 10.51.0.169 0.0.0.0 UG 0 0 0 tun0 0 0 0 10.51.0.1 10.51.0.169 255.255.255.255 UGH 0 0 0 tun0 0 0 0 10.51.0.169 0.0.0.0 255.255.255.255 UH 0 0 0 tun0 0 0 0 85.25.147.49 192.168.0.1 255.255.255.255 UGH 0 0 0 eth0 0 0 0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0 0 0 0 192.168.0.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0 0 0 0 After fixing the routing, I believe I need to use iptables to configure prerouting or masquerading to force everything for destination port 80 or 443 over tun0. Again, I'm not exactly sure how to do this! Everything I've found on the internet is trying to do something far more complicated, and trying to sort the wood from the trees is proving difficult. Any help would be much appreciated. UPDATE So far, from the various sources, I've cobbled together the following: #!/bin/sh DEV1=eth0 IP1=`ifconfig|perl -nE'/dr:(\S+)/&&say$1'|grep 192.` GW1=192.168.0.1 TABLE1=internet TABLE2=vpn DEV2=tun0 IP2=`ifconfig|perl -nE'/dr:(\S+)/&&say$1'|grep 10.` GW2=`route -n | grep 'UG[ \t]' | awk '{print $2}'` ip route flush table $TABLE1 ip route flush table $TABLE2 ip route show table main | grep -Ev ^default | while read ROUTE ; do ip route add table $TABLE1 $ROUTE ip route add table $TABLE2 $ROUTE done ip route add table $TABLE1 $GW1 dev $DEV1 src $IP1 ip route add table $TABLE2 $GW2 dev $DEV2 src $IP2 ip route add table $TABLE1 default via $GW1 ip route add table $TABLE2 default via $GW2 echo "1" > /proc/sys/net/ipv4/ip_forward echo "1" > /proc/sys/net/ipv4/ip_dynaddr ip rule add from $IP1 lookup $TABLE1 ip rule add from $IP2 lookup $TABLE2 ip rule add fwmark 1 lookup $TABLE1 ip rule add fwmark 2 lookup $TABLE2 iptables -t nat -A POSTROUTING -o $DEV1 -j SNAT --to-source $IP1 iptables -t nat -A POSTROUTING -o $DEV2 -j SNAT --to-source $IP2 iptables -t nat -A PREROUTING -m state --state ESTABLISHED,RELATED -j CONNMARK --restore-mark iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j CONNMARK --restore-mark iptables -t nat -A PREROUTING -i $DEV1 -m state --state NEW -j CONNMARK --set-mark 1 iptables -t nat -A PREROUTING -i $DEV2 -m state --state NEW -j CONNMARK --set-mark 2 iptables -t nat -A PREROUTING -m connmark --mark 1 -j MARK --set-mark 1 iptables -t nat -A PREROUTING -m connmark --mark 2 -j MARK --set-mark 2 iptables -t nat -A PREROUTING -m state --state NEW -m connmark ! --mark 0 -j CONNMARK --save-mark iptables -t mangle -A PREROUTING -i $DEV2 -m state --state NEW -p tcp --dport 80 -j CONNMARK --set-mark 2 iptables -t mangle -A PREROUTING -i $DEV2 -m state --state NEW -p tcp --dport 443 -j CONNMARK --set-mark 2 route del default route add default gw 192.168.0.1 eth0 Now this seems to be working. Except it isn't! Connections to the blocked websites are going through, connections not on ports 80 and 443 are using the non-VPN connection. However port 80 and 443 connections that aren't to the blocked websites are using the non-VPN connection too! As the general goal has been reached, I'm relatively happy, but it would be nice to know why it isn't working exactly right. Any ideas? For reference, I now have 3 routing tables, main, internet, and vpn. The listing of them is as follows... Main: default via 192.168.0.1 dev eth0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1 Internet: default via 192.168.0.1 dev eth0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1 192.168.0.1 dev eth0 scope link src 192.168.0.73 VPN: default via 10.38.0.205 dev tun0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1

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• 1Gigabit vs 1.25Gibabit mismatch

  - by Joel Coel

  I need to re-connect the network to a small old outbuilding that hasn't been used in several years. I have to use the existing 62.5um multi-mode fiber run. This end of the fiber is already connected. For the end in the building, I was looking at this pair: http://www.tp-link.com/products/productDetails.asp?class=switch&content=spe&pmodel=TL-SM311LM http://www.tp-link.com/products/productDetails.asp?class=&content=spe&pmodel=TL-SL2210WEB If you look at the sfp first (first link), it's listed at 1.25Gpbs. That's odd, because IIRC the fiber should really only do 1Gbps. It's also supposed to work with the switch I posted (2nd link), but the gbic port on the switch also only shows 1Gbps. What am I missing here?

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• Canot send SMS using gammu-smsd

  - by khalid hussain

  I am trying to send SMS using gammu-smsd, but it does not work. Modem: Huawei E1550 Steps: #vi /etc/gammu-smsdrc port= /dev/ttyUSB0 connection = at Then restarted gammu-smsd: # /etc/init.d/gammu-smsd restart SMS Sending test echo "Test message" | gammu-smsd-inject TEXT 335123456 It does not send SMS. Log Sep 27 14:19:25 Dell-Laptop gammu-smsd[10285]: Going to 30 seconds sleep because of too much connection errors Sep 27 14:19:55 Dell-Laptop gammu-smsd[10285]: Starting phone communication... Sep 27 14:19:55 Dell-Laptop gammu-smsd[10285]: Error at init connection: Error opening device, it doesn't exist. (DEVICENOTEXIST[4])

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• datacenter network change control best practices

  - by jpolache

  I have been tasked with compiling a list of possible network equipment changes at a data center. The task includes tagging which changes need change control and which don't. Does anyone know of a "best practices" list that I can start from? The methods for doing change control at this data center are well established. The list would be of specific configuration items that should or should not be included in the change control process, of example; static route entries switch port assignments firewall rule additions/changes etc.

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• Windows 2003, MySQL 5.0.24, Windows Updates causes problems with MySQL?

  - by Alessandro

  Hi, our Windows 2003 webserver has 2 GB of ram and MySQL v. 5.0.24-community-nt. Maybe due to Windows Updates (is it possible??) I've problems with MySQL databases. I should restart everyday IIS services. Events: "Changed limits: max_open_files: 2048 max_connections: 800 table_cache: 619" "Do you already have another mysqld server running on port: 3306 ?" "Can't connect to MySQL server on 'localhost'" 10055 Should I increase the innodb_buffer_pool_size, from 250M to 500M? Or/and? Thanks

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• Can't communicate using PuTTY, but can with Termite

  - by SharpHawk

  I'm trying to establish a serial connection to a peripheral from my PC's RS-232 port. Pretty simple stuff, and I've had not trouble doing it with countless peripherals before. And yet when I configure PuTTY to the right baud rate, stop bits, etc. I'll type in "*IDN?", press enter, and the unit won't reply. After going over my settings over and over again, I decided to try another terminal program, Termite. This time it worked like a charm. What puzzles me, and what I'm trying to figure out by posting this question, is why Termite would work when PuTTY did not despite the fact that they both have the same settings. PuTTY: http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html Termite: http://www.compuphase.com/software_termite.htm EDIT: I now tried Tera Term as well, and it works. So PuTTY is the odd one out.

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• What ports do I need open for IMAP connections

  - by iamjonesy

  I'm developing a web application that connects to an IMAP mailbox and fetches emails as part of it's functionality. The application is PHP and I'm connecting like this: public function connect() { /* connect to gmail */ $hostname = '{imap.gmail.com:993/imap/ssl}INBOX'; $username = $this->username; $password = $this->password; /* try to connect */ $this->inbox = imap_open($hostname,$username,$password) or die('Cannot connect to Gmail: ' . imap_last_error()); } Developing locally on my mac this was fine, I was able to connect and get emails. However now that I've put the app on my web hosts server I'm getting the following error: Cannot connect to Gmail: Can't connect to gmail-imap.l.google.com,993: Connection timed out After checking with my hosting provider they told me outgoing connections on port 993 are blocked. Is there anyway around this? Otherwise I need to upgrade to a dedicated server :S

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• Belking Wireless Router unable to connect to internet although wireless connection is working

  - by ptamzz

  I have a Belkin Basic N150 Wireless router. I'm trying to set up wireless connection using the wired ports my university has provided in my hostel room. Usually, when I connect my laptop using a LAN wire through the port, my settings are like IP: 10.5.130.X Subnet Mask: 255.255.254.0 Default Gateway: 10.5.130.250 DNS Server: 10.200.1.11 and I'm able to connect to the internet. Now instead of connecting my laptop directly, I've connected the lan wire to the Belkin Wireless Router, set the router as "Use as an Access Point" and in the IP field, I've put up 10.5.130.1. Now I've set the IP of my system manually to 10.5.130.3. I'm able to connect to the wi-fi but I'm still not able to connect to the internet. What am I missing?

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• Connection to mysql server in SYN_SENT

  - by Sunil

  We are facing a strange problem from last few days between our application server and database server(Mysql): connection to database server from application server hangs in SYN_SENT state and after that we are not able to make any connection to database server on mysql port(3306). When we checked the netstat output on database server its in SYN_RECV state. What I can figure out is mysql server is receiving the SYN request and responding also and its not reaching to the client hence SYN_RECV at server side and SYN_SENT at client side. I think SYN_SENT state should go after some time and because of this other db connection attempts to same server should not hang. Does anybody have any idea how can we resolve this issue? Out setup details : Application server: RHEL 5.4, kernel-release = 2.6.18-164.el5, x86_64 Database server: Mysql Version : 5.1.49 RHEL 5.4, kernel-release = 2.6.18-164.el5, x86_64

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