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• Free firewall for Windows Server 2003

  - by n00b_Admin

  We have a Windows Server 2003 R2 Machine here at work that I need to ensure is accessible only from specific set of IP Addresses. The Server is on a LAN and I am aware that one of the possible solutions maybe limit access to the Server's VLAN. However that is not feasible at the moment. I've been searching for a firewall that could do this, Windows' Firewall is pretty limited and I don't see an option in it to limit incoming data based on Source IP addresses. Most free firewalls like Comodo and ZoneAlarm don't work on Windows Server. Any ideas on how to accomplish this would be of great help. Thanks in advance.

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• /etc/hosts in Windows 8.1 doesnt work like in Windows 7 [on hold]

  - by user225438

  Last time when i installed Win7, i configured it to block some netbios names in LAN with hosts file. Something like this: 192.168.0.10 computer_name 192.168.0.10 computer_IP where 192.168.0.10 some ip-address in network, where user need to login to access it. So, when user trying to access computer_name via \\computer_name, he will redirect to 192.168.0.10 rather then going to computer_name. In Windows 8.1 I can't do this trick. I tried to disable Windows Defender, flushed DNS, nbtstat -R. Nothing works. When I pinging computer_name, IP address returning 192.168.0.10, but when I accessing it via explorer (\\computer_name\d$), it opening computer partitions. In Win7, when I trying to access \\computer_name, its trying to open 192.168.0.10 one. Maybe its not the best solution to do this, but it works in Windows 7.

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• let CRON send emails through SMTP ( debian squeeze )

  - by supernova

  i would like to send emails whenever a cronjob has completed, i read that this is possible with exim4. in /etc/alias i added the line myuser: [email protected] in /etc/exim4/update-exim4.conf.conf i set dc_smarthost='smtp.myserver.ip::25 and in /etc/exim4/passwd.client i set smtp.myserver.ip:[email protected]:mypassword my problem is that i can't see any login at my mailserver, and in the exim logs i saw a few lines with 2012-10-13 09:17:01 1TMvy1-0001fp-F2 ** [email protected] R=nonlocal: Mailing to remote domains not supported 2012-10-13 09:17:01 1TMvy1-0001fr-JE <= <> R=1TMvy1-0001fp-F2 U=Debian-exim P=local S=17426 are there any additional config settings i have to set? edit : i solved the prev. error by running dpkg-reconfigure, but now i'm facing the following error <root@debian> R=dnslookup T=remote_smtp defer (-53): retry time not reached for any host

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• Howto setup a `veth` virtual network

  - by Reinder

  I'd like to setup three virtual network interfaces (veth) which can communicate with each other. To simulate a three node cluster, each program then binds to one veth interface. I'd like to do it without LXC if possible. I tried using: Created three veth pairs: sudo ip link add type veth Created a bridge sudo brctl addbr br0 Added one of each pair to the bridge: sudo brctl addif br0 veth1 sudo brctl addif br0 veth3 sudo brctl addif br0 veth5 Configured the interfaces: sudo ifconfig veth0 10.0.0.201 netmask 255.255.255.0 up sudo ifconfig veth2 10.0.0.202 netmask 255.255.255.0 up sudo ifconfig veth4 10.0.0.203 netmask 255.255.255.0 up Then I verified if is works using: ping -I veth0 10.0.0.202 but it doesn't :( The I added IP addresses to the veth1,veth3,veth5 and br0 interfaces in the 10.0.1.x/24 range. But that doesn't help. Any ideas? or a guide, all I find in how to use it with LXC. Or am I trying something that isn't possible?

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• Windows failover cluster - virtual node with multiple Client Access Names

  - by mclaassen

  I recently encountered a customer environment in which they had failover cluster where one of the virtual nodes had more than one 'Client Access Name' (i.e. more than one IP address and DNS name for the single virtual node). Long story short we had to modify our software to deal with this situation, but we want to recreate the situation in house to test it before releasing. I have been unable to locate any information about how or why you would end up with a virtual node that has more than one access name. Does anyone know how I can set up a Windows failover cluster where a virtual node has more than one access name/IP?

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• How does a frame retrieve the recipient's MAC address?

  - by Sarmen B.

  I am studying a Network+ book named All-in-one CompTia Network+ by Mike Meyers. In chapter 2 he talks about frames and how he represents them as canisters and the data within the frame contains the recipients mac address, senders mac address, data, and sequence number. What I don't understand is if the sender is sending a file via the network to the recipient, and this frame contains this data, how does the frame know what the recipients MAC address is before sending it? In regards to TCP/IP when it contains the recipients IP address, that's understandable how it retrieves that value. But I don't understand how it can retrieve the MAC address, because if that frame comes from the senders computer, goes into the router and copies itself to each and every computer that exists on the network, how did it have the MAC address to know where to go? Let me know if I'm not making sense.

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• Installing CURL on Ubuntu Karmic

  - by Racertim

  Trying to get this up and running: https://github.com/cloudnull/massupload I have everything except CURL installed and when I attempt to, it fails with the following: Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: curl 0 upgraded, 1 newly installed, 0 to remove and 3 not upgraded. Need to get 196kB of archives. After this operation, 311kB of additional disk space will be used. WARNING: The following packages cannot be authenticated! curl Install these packages without verification [y/N]? y Err http://us.archive.ubuntu.com karmic/main curl 7.19.5-1ubuntu2 404 Not Found [IP: 91.189.91.13 80] Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/c/curl/curl_7.19.5-1ubuntu2_i386.deb 404 Not Found [IP: 91.189.91.13 80] Thank you!

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• problem with accessing a php page

  - by EquinoX

  So I have a info.php page which is located on the folder /var/www/nginx-default, however when I go to my ip address/info.php, it always redirects me to this site: http://www.iana.org/domains/example/ is this because I have a virtual host that I called example? Here is my config for the example website: server { listen 80; server_name www.example.com; rewrite ^/(.*) http://example.com/$1 permanent; } server { listen 80; server_name example.com; access_log /var/www/example.com/logs/access.log; error_log /var/www/example.com/logs/error.log; location / { root /var/www/example.com/public/; index index.html; } } The way I access this site is by changing my /var/hosts in my macbook so that example.com is mapped to my server IP address... however now when I do xxx.xxx.xxx.xxx/info.php.. it redirects me to that site I posted above

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• Iis multiple domain binding

  - by user2979484

  I've a server with vshpere running and one vm with Windows 2008 r2. I'm hosting a website on this vm. But I want to try to add another domain. Now I have 3 ip-adresses. 1 for vspehere. 1 for vm. 1 for 2nd domain. When I add a new site and edit the bindings to the last ip-adress (2nd domain) it doesn't work. I've added also a new network adapter on vsphere and edited in the windows network adapter. Could anyone help me out with this. Sorry for my bad english I hope you will understand it.

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• Junk host name while using nslookup, How to change it?

  - by Jayachandran

  Hi, My question is regarding the host name mapped to a machine's IP. I am new to Linux, I have a machine to test whether our j2ee based web application runs fine in linux box. we are able to deploy our application and successfully and even able to access the same in that machine. But when I tried accessing it through another machine in the same network, I am not able to access the URL using the hostname specified, instead I am able to access if I provide the ipaddress. I tried putting nslookup MyIP# command to know the name of the ip in the DNS server, where I got some junk value.com; when I tried to access with that name I am able to access the machine. Kindly provide me inputs to change the hostname of this machine in that domain server. Thanks in Advance!! Jay

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• Make my web-server traffic go through proxy?

  - by Eli

  I have a question that may or may not be possible. Basically Comcast isn't going to let me host a website on their ISP unless I have a business account. So, I spoke with my uncle who is big into networking and he told me to host my website through a proxy so Comcast cannot associate the website IP with my IP. I have purchases a proxy from proxy-hub.com, but I cannot seem to figure out what to do next. I may be approaching this totally wrong and I may need to create my own proxy server. Anybody have a clue? Thanks.

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• How to enable a Web portal-based enterprise platform on different domains and hosts without customization

  - by S.Jalali

  I work at Coscend, a cloud and communications software product company. We have built a Web portal-based collaboration platform that we would like to host on five different Windows- and Linux-based servers in different hosting environments that run Web servers. Each of these Windows and Linux servers have a different host name and domain name (and IP address). Out team would appreciate your guidance on: (1) Is there a way to implement this Web portal-based platform on these Linux servers without customizing the host name, domain name and IP address for each individual instance? (2) Is there a way to create some variables using JavaScript for host name and domain name and call them from the different implementations? (3) Can these JavaScript modules be made portable and re-usable object modules for different environments and instances? The portal is written in JavaScript that is embedded in HTML5 and padded with CSS3. Other technologies include Flash, Flex. Databases used are PostgreSQL and MySQL.

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• Event 4625 - Logon Failure - Server 2008 R2 is logging them all over the place ! How to stop the attack?

  - by user72593

  I've been monitoring failed logons to a server which is directly connected to the internet with no hardware firewall in the way...testing purposes only. Using the Server 2008 R2 firewall, I blocked access to just about everything except RDP, then I told the firewall to only allow connections to the RDP port from "MY" static IP. I tested from other locations and I am not able to login to the server unless i'm at my office. So how are people coming from Chinese IP's able to attempt logons and get logged as failures ?? Is there something i'm missing that needs to be blocked? Any help would be appreciated.

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• Can't connect to service on ubuntu?

  - by user36914

  I have a service i just installed on a ubuntu workstation machine. Say its running under port 511. I can connect locally : telnet localhost 511 When i try to connect from a remote machine it fails telnet 192.168.0.1 511 Whats wierd is i tried to connect locally using the ip address and i get the following error: "Unable to connect to remote host: Connection Refused" I checked the status of the firewall: sudo ufw status and get back "status:inactive" So does anyone know why i can't connect remotely since the firewall is disabled and why can't i connect locally using its ip address. I don't know if this matters but its running under esxi.

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• Make a server ( other than the router ) to be the default gateway for a subnet

  - by powerguy123

  I am trying to make a server ( lets call it server_A) which is different from the router to be the gateway for a subnet. Why do I want this ? I want to host a loadbalancer on server_A using LVS-NAT, and I dont want to implement a V-Lan or IP-IP tunneling. I have modified the routing tables of the remaining servers on the subnet to use server_A as the gateway. I have set server_A to not send ICMP reroute packets. But most traffic from servers in that subnet to outside clients are still being sent through the original gateway, bypassing server_A. Is there any other configuration I need to set in order to achieve my goal ?

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• Internet connection fails in Ubuntu on VirtualBox when virtual machine is created from "Import appli

  - by Sanoj

  I have installed Ubuntu Server 9.10 in a virtual machine in VirtualBox, then I made a cope/clone and exported it with "Export appliance" so I can create many cloned virtual machines. But when I try to import an appliance, everthing seams to be fine with the Ubuntu except that it can't connect to Internet and doesn't get an IP-address. The machine is used in Bridged mode. And it doesn't help to change to NAT-mode either. The machine that I cloned seams to work fine, and get an IP address. How to fix this? Where am I doing wrong?

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• Load balanced proxies to avoid an API request limit

  - by ClickClickClick

  There is a certain API out there which limits the number of requests per day per IP. My plan is to create a bunch of EC2 instances with elastic IPs to sidestep the limitation. I'm familiar with EC2 and am just interested in the configuration of the proxies and a software load balancer. I think I want to run a simple TCP Proxy on each instance and a software load balancer on the machine I will be requesting from. Something that allows the following to return a response from a different IP (round robin, availability, doesn't really matter..) eg. curl http://www.bbc.co.uk -x http://myproxyloadbalancer:port Could anyone recommend a combination of software or even a link to an article that details a pleasing way to pull it off? (My client won't be curl but is proxy aware.. I'll be making the requests from a Ruby script..)

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• Haproxy, configure for one host

  - by Michal K.

  I have to use haproxy on one machine. I want to do redirect requests from Ip to the same ip (with another port). My configuration (doesn't work): lobal maxconn 4096 # Total Max Connections. This is dependent on ulimit daemon nbproc 1 # Number of processing cores. Dual Dual-core Opteron is 4 cores for example. defaults mode http clitimeout 600000000 srvtimeout 600000000 contimeout 400000000 log 127.0.0.1 local0 log 127.0.0.1 local1 notice option httpclose # Disable Keepalive listen http_proxy 127.0.0.1:8080 balance leastconn # Load Balancing algorithm acl acl_apache path_end .avi .jpeg #option httpchk option forwardfor # This sets X-Forwarded-For ## Define your servers to balance server DE2 127.0.0.1:8080 weight 1 maxconn 15 check

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• How to route address into VPN network?

  - by ActioN

  I have an internet connection and some site named as svn.mycompany.com. I can access it from my own home computer. But our company have an private VPN, and when I connect to it, I lose access to svn.mycompany.com, but other internet sites is available. When I run nslookup from internet, svn.mycompany.com have one IP, and when run from VPN - other IP. Maybe I need to create route to this address? And if it is, can you help me to write correct command in Ubuntu Linux.

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• WAMP: Apache refusing connections outside the network

  - by JoeWolf

  I have wamp installed. I ran the server, everything is running fine from localhost and my local ip address. I forwarded port 80 on my router. Whenever I try to access the server from the outside, using my real ip, it doesn't work and timeouts. I though port forwarding is not working, forwarded another port for different service and it went through, so the problem is with apache. I checked the error log, didn't find any errors. Skype is off. Any tips what could be causing this? Thanks!

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• Hyper-V share a folder between host and instance

  - by Fly_Trap

  I have a hyper-v server and several VM's (Virtual Machines). All the VM's are connected to an external network. I have tried to share a folder on the host and connect via the VM, I can do this but I'm prompted for a user name and password (as you would expect). I do not want to enable the "Everyone" group permissions as the physical host server is on a network of other servers. I have created a new virtual internal network in Hyper-V and given it's adapter a static ip of 33.0.0.100. I have added the virtual adapter to one of the VM's and set to IP to 33.0.0.2 (as advised here). Again this seems to work but I'm still prompted for a user name and password. Am I on the right lines here? I just want to share a directory from the host to the vm's without exposing the share to other servers on the network.

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• Vista Home Premium won't connect to network.

  - by Ice

  I deinstalled some software (e.g. some Toolbars for IE and Norton security suite, because the free trial period of 60 days is run out and so i want to switch to microsofts free security essentials). But now i cannot connect to the network again: Neither over LAN nor over WiFi. Neither with standard DHCP ON (sets a 169.254.x.y address) nor with fixed IP-Address. No error during changing the settings. Ping to the Gateway e.g. doesn't work and gives "generall failure". The DHCP-Client sets no IP-Address. There is allways only 'local access' on every network-connection. i ran out of ideas, please help. UPDATE per 2011-03-11: I followed each and every hint but nothing changed. I did a research on microsofts homepage through all the sites belonging to network but nothing helped. What can i do next?

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• How can I set clean urls (enable rewrite) if I don't have a domain ?

  - by Patrick

  In order to enable clean urls in Drupal, I add the lines below to the lighttpd configuration file. However I'm now working on a local server and I don't have a domain available. So I need to work with this address http://local.ip/Sites/mywebsite I've tried to replace ["host"] with ["socket"] and replace the domain with ip and subfolders (see address above), but unsuccessfully. How can I set the configuration file to set clean urls even if I don't have a domain ? thanks $HTTP["host"] =~ "(^|\.)mywebsite\.com" { server.document-root = "/var/www/sites/mywebsite" server.errorlog = "/var/log/lighttpd/mywebsite/error.log" server.name = "mywebsite.com" accesslog.filename = "/var/log/lighttpd/mywebsite/access.log" include_shell "./drupal-lua-conf.sh mywebsite.com" url.access-deny += ( "~", ".inc", ".engine", ".install", ".info", ".module", ".sh", "sql", ".theme", ".tpl.php", ".xtmpl", "Entries", "Repository", "Root" ) # "Fix" for Drupal SA-2006-006, requires lighttpd 1.4.13 or above # Only serve .php files of the drupal base directory $HTTP["url"] =~ "^/.*/.*\.php$" { fastcgi.server = () url.access-deny = ("") } magnet.attract-physical-path-to = ("/etc/lighttpd/drupal-lua-scripts/p-.lua") }

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• Cannot ping a VM from a Hyper-V host

  - by user1688175

  I am facing a weird situation in my network environment. My infrastructure looks like this: I have a D-LINK DIR-635 acting as my default gateway (192.168.0.1) A physical Windows 2012 Server (192.168.0.10) with the following roles: DHCP, DNS, AD DS and Hyper-V. A virtual Windows 2012 Server (192.168.0.50) which I intent to use as an IIS server (Role is not deployed yet). My virtual machine was able to get an IP address from the DHCP server and is working perfectly (I can ping the default gateway [by IP, FQDN or DNS Alias], the Hyper-V host and any site on the Internet (CNN.com for example). However I cannot ping the VM from my host. It says: Request Timed Out. Do you guys know what I might be doing wrong? Any support is appreciated! Thanks!

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• Block a Server from reaching a machine

  - by user

  I have a Windows 2003 server that I want to block from accessing a specific IP address. I want to control this from the Server. because I control the machine. The traffic is http traffic (webservice call). It uses a non-standard port, so IP address+ Port combination would also work. Background: I have a development enviornment that for some reason is ignoring host file enteries under some circumstances. These host files point the enviornment at services in another Dev enviornment. Wne th host files are ignored, dev is talking to production. This is not my question, rather the motivation for this inquiry. I want is a failsafe to ensure dev will error instead of happily engaging in transactions with production. I control the dev server, I do not control the firewalls or the target production machine.

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