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• Forwarding MySQL connection with iptables and differents network interfaces

  - by Emilio Nicolás

  I have a PC with Ubuntu as a router. It has a 3G connection with a public IP to the Internet, and there is a private wireless subnet. So it has two active interfaces: ppp0: public IP (WAN) wlan0: private IP (LAN) With iptables I wannt to forward every MySQL connection (port 3306) to a local machine (10.42.43.10) of the subnet. I type these iptables commands: iptables -A PREROUTING -t nat -i ppp0 -p tcp --dport 3306 -j DNAT --to 10.42.43.10:3306 iptables -A FORWARD -p tcp -i ppp0 -o wlan0 -d 10.42.43.10 --dport 3306 -j ACCEPT But it doesn't work. telnet publicip 3306 fails :-( Any help will be appreciated. Thanks!

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• port forwarding on windows server 2008 to Hyper-v machines

  - by This is it

  I have a host machine (win server 2008 R2) with several Hyper-V virtual machines. I want to be able to redirect certain ports of host to virtual machines. There is virtual network connection between host and virtual machines (192.168.10.xxx). Host is also attached to external network (10.10.10.123). Virtual machines have several other networks between them. E.g., I want to be able to redirect traffic from 10.10.10.123 12345 to 192.168.10.321 54321 I tried RRAS in windows server but for it to work Default gateway to 10.10.10.123 has to be set in virtual machines. Virtual machines can not be on external network.

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• Port-forwarding on livebox to router

  - by Yusuf

  Hello, At home, I have two routers, one Livebox and a Netgear. The reason why I need the Livebox is that the phone line cannot be connected to the Netgear router. So I have the Livebox connected to the phone line, the Netgear connected to the Livebox, and all PCs connected to the Netgear. My issue is that for every application or port that I want to give external access, I have to create entry in both the Livebox and the Netgear routers; so I would like to know if there's a way to automatically forward all requests to the Netgear router, from which I will then forward to the required IP:port. Thanks in advance.

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• PORT FORWARDING TO PUT MY WEB SERVER ON THE INTERNET

  - by Chadworthington

  I went to http://canyouseeme.org/ to check to see what my external IP address. Regardless of what port I enter, it tells me that the port is blocked. I have a LinkSys router that basically has the default settings with the exception that I have WEP encrptin setup and I have forwarded a few ports, including 80 and 69. I forwarded them to the 192.x.x.103 IP address of the PC which is running IIS. That PC runs Symantec Endpoint Protection, which I right mouse clicked in the tray to Disable. These steps used to make my PC visible so I could host my own web site in IIS on port 80, or some other port, like 69. Yet, the Open Port tool cannot see my IP when it checks eiether port and when I navigate to http://my external ip/ I get "page cant be displayed" At first I was thinking that maybe Comcast is blocking port 80, but 69 doesnt work eiether. I do not see any other blockking set up in my router and, as I mentioned, I went with teh defaults except where discussed. This is a corporate PC and Symantec End Point Protecion is new to it (this previously worked on teh same PC with Symantec Protection Agent), but I thought that disabling Sym End Pt from the tray, that that would effectively neutralize it. I do not have the rights to kill the program itself. Any suggestions on what else to try to make my PC externally visible?

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• fast X11 forwarding

  - by user20196

  Hi, I am using ssh -X to display GUI apps locally. Is there a better way to speedup this processes - something similar what NoMachine Nx server / client does? Thanks, Mariusz.

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• AT&T DSL 2701HG-B Modem, port forwarding to RealVNC

  - by Paula

  Our old cable modem could easily be set up to forward an "incoming port request" to the RealVNC software. Allowing us to log into our home computer from any location. We don't see any such configuration possiblity with our new AT&T DSL 2Wire 2701HG-B modem. (And it appears to have 2 entirely different 'set up screens'. Why?) Where is the screen that allows "forward incoming request for a certain port", to a certain computer, and direct it towards RealVNC"?

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• ssh port forwarding / security risk

  - by jcooper

  Hi there, I want to access a web application running on a web server behind my office firewall from an external machine. We have a bastion host running sshd that is accessible from the Internet. I want to know if this solution is a bad idea: Create an account on the bastion host with shell=/bin/false and no password ('testuser') Create a ssh RSA key on the external machine Add the public RSA key to the testuser's authorized_keys file ssh to the bastion host from the external host using: ssh -N 8888:targethost:80 run my tests from the external host shut down the ssh tunnel I understand that if my RSA private key were compromised then someone could ssh to the bastion host. But are there other reasons this solution is a bad idea? thank you!

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• Port forwarding to a computer with two NICs

  - by howdyHey

  I have a laptop which occasionally uses Ethernet and most of the time WiFi. Now I want to forward a port in the router so that it always points to my current IP. I'm likely to get different IPs from time to time and I can't really use a dedicated IP for the machine since the IPs are assigned by MAC address and the wireless card has a different MAC address than the Ethernet port. I'm using a NetGear CG3100 router.

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• iptables port forwarding troubleshooting

  - by cbmanica

  I'm trying to forward connections on port 18600 to port 9980. I have this in /etc/sysconfig/iptables: # Generated by iptables-save v1.3.5 on Mon Oct 21 18:30:43 2013 *nat :PREROUTING ACCEPT [2:280] :POSTROUTING ACCEPT [12:768] :OUTPUT ACCEPT [12:768] -A PREROUTING -p tcp -m tcp --dport 18600 -j REDIRECT --to-ports 9980 COMMIT # Completed on Mon Oct 21 18:30:43 2013 and /etc/init.d/iptables status shows me this: Table: nat Chain PREROUTING (policy ACCEPT) num target prot opt source destination 1 REDIRECT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:18600 redir ports 9980 However, I can telnet from localhost to port 9980, but not 18600. What am I missing? (This is a CentOS-based VM.)

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• Question about Domain Forwarding [beginner]

  - by Jack W-H

  Hello folks Just a quick beginner's question here. I have a webapp located at domainxyz.com, and it generates short URLs for long posts automatically - so rather than visit domainxyz.com/reallylongpostnamehere I can just type domainxyz.com/a5c and be taken there automatically. However, I've bought a shorter domain name - short.com - and I want to be able to visit short.com/a5c and be redirected (or forwarded) to domainxyz.com/a5c. Or short.com/7f0 -- domainxyz.com/7f0. This way, although it seems a tad illogical it saves me setting up another hosting account on short.com to deal with the URL shortening. Is this possible? I realise you can forward domains, but, can you forward domains AND forward the URL segments? Thanks! Jack

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• Port Forwarding a Specific Port (e.g. 22)

  - by Jerry Blair

  I'm still confused about establishing an SSH connection (port 22) between two computers on different internal networks. For example: I am on my computer with internal IP address IIP-1, connected to my router RT-1. There are 10 IIPs connected to RT-1. I want to establish an SSH connection to IIP-3 which is connected to router RT-2. There are 10 IIPs connected to RT-2. At any time, there can be multiple SSH connections between IIPs on RT-1 and RT-2. Since I only have port 22 available, I don't know which SSH session is talking between which IIPs. I looked at a couple of similar questions but am still unclear on the solution. Thanks much, Jerry

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• Email forwarding via spf record

  - by Y.G.J

  I have old-domain.co.il with several emails and a new-domain.co.il with the same email addresses. I don't want to connect my domain to a server via mx to make that transfer via email server. Is it possible to have a SPF record that get an email like [email protected] and transfer it to [email protected]? The new domain is on google apps and the old domain can be connected to the same apps, but how to do it, so emails will arrive only to the new one?

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• IP Forwarding and Routing in Windows 2008

  - by Danialzo

  I have Hyper-V running on a windows 2008. I got a new ip stack from the data center to be set on my virtual machines. But I have difficulties to set these IPs on my VMs because they are on different network. my current server ip is xxx.xxx.18.6 with MASK : 255.255.255.224 and the GW is xxx.xxx.18.1 my new ip stack is xxx.xxx.168.176/29 I can use RRAS to achieve this. Do I need to create another NIC? How do I make these VMs reachable from outside?

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• Port Forwarding for Remote Desktop

  - by Vaibhav Bajpai

  I have two Mac notebooks at home, I have assigned them static private IPs. I have also set my router to a DynDNS address, which updates everytime my router gets a new public IP. I have enabled Screen Sharing on both notebooks. I can successfully goto my router webpage using the DynDNS address. I understand I need to port-forward to get Screen Sharing to work from outside. Lets assume, notebooks have private IP 192.168.1.2 and 192.168.1.3 I am kind of lost here, would appreciate some help (I need to be able remote desktop to both notebooks)

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• Loading GUI on host machine through SSH with X11 forwarding

  - by cdated

  I've got applications on my host machine running fine by runnning: $ssh -X user@host Welcome to host $firefox Firefox proceeds to run in client display from the host machine. How do I get firefox to load on the host machine's display so I could remotely manage the host machine's running GUI applications? I need my application to load a GUI on a remote machine without walking to that machine.

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• Port forwarding does not work always?

  - by ITFan

  I opened port 25374, this is eMule TCP port, then I use canyouseeme.org to check if it is really opened. I got the weird problem : when eMule is running, canyouseeme.org see my port. I got the message : "Success: I can see your service on xxx.xx.xxx.xx on port (25374) Your ISP is not blocking port 25374" When I close eMule then check the port again on canyouseeme.org I got : Error: I could not see your service on xxx.xx.xxx.xx on port (25374) Reason: Connection timed out But when I turn off the windows firewall I got a different error : Error: I could not see your service on xxx.xx.xxx.xx on port (25374) Reason: Connection refused Can anyone please explain to me why it happened like that and how to make the port always opened ? Thanks

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• Automatically encrypting incoming email

  - by user16067

  I have a small website and would like to encrypt incoming email using gpg. Is there a way to force sendmail to check email and encrypt it if its not already encrypted? I'm using GPG on a linux server. Thanks [added]Someone asked what I hope to accomplish. My intent is for the users of the email to become more familiar with seeing thier own email encrypted and losing that fear of the unknown. The side benefit is that the email can't be looked at later down the road. If the email isn't encrypted on its way in, I'm unable to do anything about it. I'm assuming most email would be nosed around with once its already on my hard drive, so GPG would protect against those issues.

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• Setting up port forwarding for web server

  - by reyjavikvi

  This could belong on Super User, but I thought this place was more appropiate. I want to run Apache in my computer and want to make it available to the outside world to test a couple things. Apparently, I have to go into my router's (a TP-LINK TD 8910G) settings and forward port 80 to my PC's IP. So far so good. Thing is, since the router uses a web based interface and it's kind of stupid, it told me that since I was using port 80 for this, I should access its settings through port 8080. Maybe it can't detect requests coming from the LAN, I don't know. Point is, now neither port can't access the configuration, and I can't access Internet. Specifically, trying to access anything (including 192.168.1.1, the router's settings) through port 80 turns up a blank page (maybe if I had the server running in my computer I'd get something, but I don't want to risk trying, I had to reset the router and restore the settings), and port 8080 gives a "Can't establish connection" error in Firefox (and similar ones in other browsers). Is there a way to configure the router to not redirect requests coming from inside the network? I'm a beginner with this stuff, so please try to explain in a simple way. If this is more appropiate in Super User, I'm sorry.

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• Browsers forwarding to random website automatically

  - by SmartestVEGA

  i have a strange problem... whenever i type any website name in the browser (mozilla or IE), instead of showing the website i typed it forwards to another website this happend when i installed a software... i guess this is a virus. how to resolve this?

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• Port forwarding using ASDM 6.0

  - by Jason

  Hey guys, I'm not too savvy with ASDM and it has been quite some time since I have done anything IOS so forgive me. I am trying to forward port 3389 from 'any' on 'outside' (1.1.1.1) to an internal server (10.10.10.10). Can anybody give me the steps to do this using ASDM or IOS. Thanks, -Jason

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• centos 6.3 kvm external ip forwarding to guests

  - by user1111702

  I have a centos 6.3 server with kvm installed. The server has 4 external ips and one NIC. 176.9.xxx.xx1 176.9.xxx.xx2 176.9.xxx.xx3 176.9.xxx.xx4 I use the following configuration ifcfg-eth0 as slave to ifcfg-br0 the configuration in ifcfg-eth0 is DEVICE=eth0 ONBOOT=yes BRIDGE=br0 HWADDR=14:da:e9:b3:8b:99 and in the ifcfg-br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=static BROADCAST=176.9.xxx.xxx IPADDR=176.9.xxx.xx1 NETMASK=255.255.255.0 SCOPE="peer 176.9.xxx.xxx" and I have 3 more aliases for br0 , br0:1 to get the trafic from the second external ip DEVICE=br0:1 IPADDR=176.9.xxx.xx2 NETMASK=255.255.255.248 ONBOOT=yes br0:2 to get the trafic from the third external ip DEVICE=br0:1 IPADDR=176.9.xxx.xx3 NETMASK=255.255.255.248 ONBOOT=yes br0:3 to get the trafic from the second external ip DEVICE=br0:1 IPADDR=176.9.xxx.xx4 NETMASK=255.255.255.248 ONBOOT=yes The above settings work fine and I recieve the trafic from all the external ips. My problem is that I want to pass the trafic from external ip to specific virtual guest on my server. ie trafic that comes from 176.9.xxx.xxx2 must pass to virtual machine 1 176.9.xxx.xxx3 must pass to virtual machine 2 176.9.xxx.xxx4 must pass to virtual machine 3 Can you please help me how to achieve this ? What are the settings on the host and what should I do to the guests. Thank you in advance

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• Port Forwarding to put my web server on The Internet

  - by Chadworthington

  I went to http://canyouseeme.org/ to check to see what my external IP address. Regardless of what port I enter, it tells me that the port is blocked. I have a LinkSys router that basically has the default settings with the exception that I have WEP encrptin setup and I have forwarded a few ports, including 80 and 69. I forwarded them to the 192.x.x.103 IP address of the PC which is running IIS. That PC runs Symantec Endpoint Protection, which I right mouse clicked in the tray to Disable. These steps used to make my PC visible so I could host my own web site in IIS on port 80, or some other port, like 69. Yet, the Open Port tool cannot see my IP when it checks eiether port and when I navigate to http://my external ip/ I get "page cant be displayed" At first I was thinking that maybe Comcast is blocking port 80, but 69 doesnt work eiether. I do not see any other blockking set up in my router and, as I mentioned, I went with teh defaults except where discussed. This is a corporate PC and Symantec End Point Protecion is new to it (this previously worked on teh same PC with Symantec Protection Agent), but I thought that disabling Sym End Pt from the tray, that that would effectively neutralize it. I do not have the rights to kill the program itself. Any suggestions on what else to try to make my PC externally visible?

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• Setting up port forwarding for web server

  - by Javier Badia

  This could belong on Super User, but I thought this place was more appropiate. I want to run Apache in my computer and want to make it available to the outside world to test a couple things. Apparently, I have to go into my router's (a TP-LINK TD 8910G) settings and forward port 80 to my PC's IP. So far so good. Thing is, since the router uses a web based interface and it's kind of stupid, it told me that since I was using port 80 for this, I should access its settings through port 8080. Maybe it can't detect requests coming from the LAN, I don't know. Point is, now neither port can't access the configuration, and I can't access Internet. Specifically, trying to access anything (including 192.168.1.1, the router's settings) through port 80 turns up a blank page (maybe if I had the server running in my computer I'd get something, but I don't want to risk trying, I had to reset the router and restore the settings), and port 8080 gives a "Can't establish connection" error in Firefox (and similar ones in other browsers). Is there a way to configure the router to not redirect requests coming from inside the network? I'm a beginner with this stuff, so please try to explain in a simple way. If this is more appropiate in Super User, I'm sorry.

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• Port forwarding with Windows Server 2008

  - by uttt

  I have Windows 2008 server. It works as a mail, ftp, web server. In my LAN there is other server and i want to reach this server with RDC from outside my lan, (example: domail.com:5555 - 192.168.0.2:3389). Is there any solution to forward this port using Windows Firewall?

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• Selecting Interface for SSH Port Forwarding

  - by Eric Pruitt

  I have a server that we'll call hub-server.tld with three IP addresses 100.200.130.121, 100.200.130.122, and 100.200.130.123. I have three different machines that are behind a firewall, but I want to use SSH to port forward one machine to each IP address. For example: machine-one should listen for SSH on port 22 on 100.200.130.121, while machine-two should do the same on 100.200.130.122, and so on for different services on ports that may be the same across all of the machines. The SSH man page has -R [bind_address:]port:host:hostport listed I have gateway ports enabled, but when using -R with a specific IP address, server still listens on the port across all interfaces: machine-one: # ssh -NR 100.200.130.121:22:localhost:22 [email protected] hub-server.tld (Listens for SSH on port 2222): # netstat -tan | grep LISTEN tcp 0 0 100.200.130.121:2222 0.0.0.0:* LISTEN tcp 0 0 :::22 :::* LISTEN tcp 0 0 :::80 :::* LISTEN Is there a way to make SSH forward only connections on a specific IP address to machine-one so I can listen to port 22 on the other IP addresses at the same time, or will I have to do something with iptables? Here are all the lines in my ssh config that are not comments / defaults: Port 2222 Protocol 2 SyslogFacility AUTHPRIV PasswordAuthentication yes ChallengeResponseAuthentication no GSSAPIAuthentication no GSSAPICleanupCredentials no UsePAM yes AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT AcceptEnv LC_IDENTIFICATION LC_ALL AllowTcpForwarding yes GatewayPorts yes X11Forwarding yes ClientAliveInterval 30 ClientAliveCountMax 1000000 UseDNS no Subsystem sftp /usr/libexec/openssh/sftp-server

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