Port forwarding is a process consisting in the translation of a host:port couple into another host2:port2 couple, both submitted to the same network mask.

learn more… | top users | synonyms

1
vote
0answers
91 views

What is the point of the second route lookup after OUTPUT?

According to the packet path diagram, and its description: Table 6-2. Source local host (our own machine) [...] Routing decision, since the previous mangle and nat changes may have ...
2
votes
1answer
718 views

Forwarding packets from loopback interface with policy-based routing

I have the following iptables rule: iptables -t mangle -A PREROUTING -p udp -m udp --dport 10000 -j MARK --set-xmark 0x4/0xffffffff which sets fwmark 4 on all udp packets with destination port ...
1
vote
0answers
367 views

How to forward Remote-Desktop Port across interfaces using ufw?

Machine A has two network interfaces: Network eth0: 10.10.20.0/24 Network wlan0: 192.168.1.145/24 Machine A has 192.168.1.145 as Default Gateway, and also a route to pass 172.16.0.0/16 to ...
6
votes
4answers
2k views

List ports a process PID is listening on (preferably using iproute2 tools)?

I'm looking to list all ports a PID is currently listening on. How would you recommend I get this kind of data about a process? NOTE: I was surprised I could not easily find an answer to this!
1
vote
1answer
315 views

ssh settings `permitopen=“localhost:4000”` does not limit remote port forwarding [duplicate]

I have a special user on my server, let's call it foo. I use it only for port forwarding. The user's .ssh/authorized_keys2 is set up to prevent login and to open only a specific port: ...
1
vote
0answers
56 views

Forcing broswers to use a different host and port when viewing websites over ssh-tunnels

I've setup an ssh tunnel to a network that has a website I need to view. However, when requesting the page my browsers sends the host localhost and url http://localhost:1234 in the HTTP headers. Is ...
0
votes
0answers
134 views

Cannot connect to Solaris Server when Oracle GoldenGate process uses the port

I'm trying to test the Oracle goldengate to replicate data between two databases on the same server. So I installed two databases and two goldengate homes in the same machine. The goldengate ...
0
votes
3answers
1k views

Redirect domains to different ports on same machine

I used the following command to redirect 80 to 3000. All the requests that come, from any domain, are redirected to 3000: sudo iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-port ...
2
votes
0answers
228 views

SSH Failing to fork with sshpass

I've a problem with port forwarding command using sshpass. Problem is that it's working on one server and does not work on another. Both are Debian 7 x64 boxes. sshpass -p password ssh -f -D ...
1
vote
1answer
63 views

Unable to access an http sevice forwarded using ssh

I forwarded a port from a remote server (which has Tomcat running on it) to a local port on my machine. Say, if the remote server address is http://myremoteserver.com:8080, I forwarded the port to ...
2
votes
1answer
561 views

In iptables, what is the difference between targets DNAT and REDIRECT?

More specifically, is -A PREROUTING -i $INT -p $PROTO --dport $PORT -j REDIRECT --to-ports $NEWPORT equivalent to one or both of these? -A PREROUTING -i $INT -p $PROTO --dport $PORT -j DNAT ...
2
votes
2answers
311 views

Allow multiple remote connections to an ssh Dynamic forwarded port

Let us assume I have three machines A - Server to which I am sshing to B - Client from which I am sshing C - Another Client in B's subnet Now, I set up dynamic port forwarding for port 1235 by ...
1
vote
1answer
241 views

forwarding not working in iptables from 8006 to 443

My dedicated server was bridged to vmbr0 and it has 2 Ethernet cards eth0 and eth1 its bridged. I have enabled forwarding with net.ipv4.ip_forward=1. I want to redirect the Port 8006 to 443. Now ...
6
votes
5answers
3k views

Securely tunnel port through intermediate host

I'm looking to route a port for VNC back to my house here. I have to jump over a single host to then hop to my actual work machine. sittinghere will be my local home machine hopper will by the ...
1
vote
0answers
37 views

Forward port 80 to another port [duplicate]

I am running a webserver on a RedHat 6 box that I don't have root access to. Because I need ports 80 and 443, I require root access to start and stop the server. I am not allowed root access, but I ...
5
votes
2answers
571 views

Why does ssh -g say that address is already in use?

I setup an SSH connection with port forwarding that allows remote hosts to connect to the local forwarded ports like this: ssh -g -L 5115:localhost:5115 <server> The connection works fine ...
1
vote
3answers
780 views

what does this ssh command mean?

Its an answer I got from questioning about port forwarding but I'm not sure what it means.. $ ssh lab_desktop -L 2200:lab_server:22 -vvv my wild guess: first get connect to lab_desktop and then ...
0
votes
2answers
48 views

how to track down an internal port redirection?

I'm trying to understand something with X11 and one fact that I discovered is that the X display stuff seems to be sent through a port called "localhost:11" So I tried the netstat -n | grep ':11' ...
2
votes
2answers
262 views

Temporary redirect ports

I need a temporary redirection of some ports to another machine. I've tried: iptables -t nat -A PREROUTING -p tcp --dport 4321 -j DNAT --to-destination 192.168.121.4:80 But shorewall blocks all ...
1
vote
1answer
220 views

Putty use local internet proxy for remote machine

Is there a way you can use your local internet proxy for remote computer with tunneling via SSH. My machine has access to internet via proxy. But the remote computer does not. I don't have admin ...
7
votes
2answers
474 views

Determine dynamically allocated port for OpenSSH RemoteForward

Question (TL;DR) When assigning ports dynamically for remote forwarding (a.k.a. -R option), how can a script on the remote machine (for instance sourced from .bashrc) determine which ports were ...
2
votes
1answer
428 views

SSH Setup - How will the router know my computer's ip?

I'm very new to the networking side of the house and am trying to set up SSH on my new Ubuntu machine. I have my DD-WRT router working with DDNS now and can log in to the router page -- but I'm not ...
0
votes
1answer
207 views

How to access my webserver from the host machine? [duplicate]

My host OS is Gentoo, guest OS - Fedora. I have a web server on Fedora on port 8686 and it works perfectly on guest OS, but I can't access it on my host OS. I tried to use bridged network (then I got ...
4
votes
1answer
5k views

How to check if port forwarding is enabled?

I have just set up a DNS server for my own network, and many guides online suggest to make sure that port forwarding on port 53 is not enabled. The thing that is not clear to me is this: should I ...
2
votes
2answers
5k views

Redirect requests to my external IP/port to an internal IP/port?

I have a dedicated server running KVM virtualization with n public IP addresses dedicated to n-1 web-facing virtual machines. Now I'd like to set up some web-facing VM's that don't have a dedicated ...
1
vote
2answers
7k views

Route add gw: how to

I'm in a network with IP 10.0.1.X (pc A). There's another sub-network: 10.0.3.0 I can ping pc B connected to this network: ping 10.0.3.X ---> OK Now, B is connected also in wifi to a network ...
0
votes
0answers
48 views

Possibility to use app in LAN and via Internet

I use web based (https encapsulated) app in my home network and via Internet. The app has dedicated Linux desktop client (I use Mageia ver4 Linux for laptop). Of course server address I have connected ...
0
votes
1answer
1k views

Double port forwarding - SSH

NOTE: I'm not explaining why I want to do this. But here is the requirement. There are 4 hosts. Host A, Host B, Host C, Host D Host A is running some application which can be accessed at port 8001 ...
7
votes
3answers
13k views

iptables redirect outside requests to 127.0.0.1

I have a service running on 127.0.0.1 with port 2222. I need to forward all requests to 192.168.2.2:2222 (outside IP) only from subnet 192.168.1.0/24 to 127.0.0.1:2222. I'm trying to use this, but ...
1
vote
1answer
116 views

How can I interact with my home router via a device on the local network using ssh? [duplicate]

I have a raspberry pi plugged into my router at home, running raspbian. Before I left for work I: Configured the router to forward ports 80 and 22 to the pi Configured dyndns This all works, and I ...
2
votes
1answer
496 views

iptables Port Forwarding — no service with the port

I have setup a network as in the image below: Firewall (FW) running CentOS 6 has two physical interfaces with subinterfaces: eth0:2 — 10.100.1.78/25 eth0:3 — 10.100.1.79/25 eth3 — 192.168.0.21/24 ...
1
vote
1answer
250 views

Redirection to services in NAT or Bridged Network only with one subdomain

I have one subdomain (dyndns). xyz.dyndns.com (f.e.) Here my question begins: I have a server for virtualisation. On the server I have multiple VMs where different web-services are available ...
3
votes
1answer
170 views

sshfs LocalForward without config file

I'm trying to add portforwarding to my sshfs-mount-scripts: sshfs tim@devserver1:/ /home/tim/mnt/devserver1/ -o SSHOPT=LocalForward 127.0.0.5:3306 127.0.0.1:3306 So far I've failed using the ...
1
vote
2answers
3k views

How to forward port by (sub)domain name?

I have this setup: a (Host) FreeBSD 9.2 host server running VirtualBox with another (Guest) FreeBSD guest server. I have set up port forwarding on the Host to the Guest like this: VBoxManage ...
1
vote
0answers
116 views

setting up a local VoIP to use as a Wifi Headset

I had this idea of using Wi-fi in a vehicle to connect my cell to the car call handler.Just as it works with bluetooth nowadays. Just to demonstrate that such a thing is possible , i had three Linux ...
3
votes
1answer
353 views

listen to a conversation using port forwarding

I have been able to make a phone calls using the SIP client Pjsua from one Linux computer to another one. In case you have not heard of this user agent, explaining it's functionality is quite easy. It ...
5
votes
3answers
2k views

SSH access from inside and outside a LAN using the same terminal command

I have a Raspberry Pi (RPi) and I am making remote connections to it using ssh. I have managed to set up ssh correctly such that I can access the RPi both from a local area network and from the ...
1
vote
1answer
376 views

How to forward one port to another (on the same machine)?

A machine (M) is behind a NAT. Port X is forwarded through, and available to the internet. My application wants to connect to port Y. How to I configure M to forward incoming data on port X to port ...
3
votes
2answers
2k views

SSH connection refused from inside my LAN

I'm on Fedora 19 and I have a problem with ssh. Ssh is up and running and I can connect when I enter my lan ip. But when I try my server name (blahblah.no-ip.org) I get a connection refused. No-ip is ...
3
votes
2answers
695 views

SSH through router to internal file server

This is a real beginner question, I know. But I really don't seem to be able to wrap my head around the terminology to get what I want working. And since I want to do this on a router that 40-50 ...
1
vote
2answers
2k views

I am trying to open port 19132 on my Ubuntu server, but not working

I am trying to set up a server for my son to play Pocketmine. This is a PHP server and it is running on port 19132. I have opened this port on my router and if I run another server, like a Rails ...
1
vote
1answer
289 views

Tunnel HTTP traffic using another machine via SSH

I have this situation: server 1: public ip x.x.x.x private ip 192.168.0.1 server 2: private ip 192.168.0.10 The server 1 can reach the internet with both interfaces: ping -i x.x.x.x ...
2
votes
1answer
334 views

SSH Connection into LAN without port forwarding?

I'm living inside a study union for the next few month. the organisation has its own network and gateways where the students are connected to the internet. problem: I don't have access to the routers ...
1
vote
1answer
926 views

OpenVPN port forwarding without router forwarding?

I would like to setup an OpenVPN server with port forwarding on my VPS, because I can not forward ports in my home router. The general question is, if it is even possible to bypass router port ...
4
votes
2answers
5k views

iptables port forwarding

I have a CentOS server with Java/J2EE(Tomcat) installed on TCP port 8080. I have two interfaces, eth0 and lo. I need to forward all incoming connection on TCP port 80 to 8080. I tried doing the ...
-1
votes
1answer
240 views

how to transfer port in virtual box

I am running a Debian guest VM on Oracle VirtualBox on my Windows machine. I have a DNS server (bind) on the guest that I'd like to see externally from outside the guest OS. How do I give this access ...
2
votes
1answer
139 views

Redirecting an active port

Environment: Web server that requests pages on a specific port from an application server. Problem: If a page request comes into the application server during the restart of a certain web application ...
2
votes
1answer
952 views

Port Forwarding using iptables on Open-Mesh

A quick overview for those who are unfamiliar with Open-Mesh: The system uses small wireless access points that automagically build their own mesh network. As long as one of the access points is ...
6
votes
2answers
13k views

How can I redirect outbound traffic to port 80 using iptables locally?

I'm trying to locally redirect ports on my Ubuntu machine using iptables. Similar to transparent proxying. I want to catch anything trying to leave my system on port 80 and redirect it to a remote ...
0
votes
2answers
195 views

Mirror localhost:3280/some/long/url to localhost:3000

I have a webservice running on localhost 3280 that exposes Elasticsearch server under /some/long/url. I would like to access Elasticsearch from localhost's port 3000. Can I do this with ...