Questions tagged [tunneling]
The tunneling tag has no usage guidance.
177
questions
168
votes
8
answers
286k
views
Simple way to create a tunnel from one local port to another?
I have a development server, which is only accessible from 127.0.0.1:8000, not 192.168.1.x:8000. As a quick hack, is there a way to set up something to listen on another port (say, 8001) so that from ...
- 1,785
44
votes
4
answers
75k
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ssh into a server which is connected to a VPN service
I have a virtual private server, which I would like to run a web server while my server is connected to a VPN service
When the VPN connection to my provider is not up, I can do anything I want with ...
- 483
31
votes
4
answers
65k
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What is the tun network interface for?
I noticed when running ifconfig that there is a network interface called tun0 and it has an ipv4 address. A bit of research shows that it is a tunneling device, but I don't really know how it's used, ...
- 473
17
votes
7
answers
47k
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How to route specific addresses through a tunnel?
There are certain websites/services which I can only access from the subnet on which my server is located (think of the typical intranet scenario). Is there a way to transparently route traffic that ...
- 373
15
votes
1
answer
37k
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Understanding tun0 addresses
I have already done some searching and more or less understand what a tun0 interface does. I got the following from various sources,
Packets sent by an operating system via a tun/tap device are ...
- 305
12
votes
2
answers
82k
views
iptables forward traffic to vpn tunnel if open
I've used the following guide to set up my raspberry pi as an access point:
Raspberry Pi 3 as wifi access point
I'm forwarding wlan0 to eth0 and NATing all my traffic. Works great!
sudo iptables -t ...
- 451
11
votes
1
answer
11k
views
What is this sit0 device?
I'm setting my computer (running Debian Buster) up for Hurricane Electric's IPv6 tunnel broker. They provide instructions for several configuration methods, but here's for iproute2, which I've been ...
- 885
11
votes
1
answer
20k
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Forward all ports SSH
I have a question about SSH/Port forwarding. I haven't found the solution anywhere and don't know if there is any.
I have a server behind my NAT box at home. I have port forwarding from my NAT box to ...
- 817
10
votes
3
answers
3k
views
Is it possible to expose TCP tunnel in Linux as special character device?
Recently I found in QNX documentation that it allows to set up message based IPC between processes on separate physical machines by using serial device (dev/serX) and it made me wonder:
Is it ...
- 1,323
9
votes
1
answer
19k
views
Why doesn't FTP work through my ssh tunnel?
Computer A (assumed that ip is 44.44.44.44)can ftp the host 130.89.148.12.
ftp 130.89.148.12
Connected to 130.89.148.12.
220 ftp.debian.org FTP server
Name (130.89.148.12:debian8): anonymous
331 ...
- 405
9
votes
1
answer
8k
views
How to utilize TUN/TAP tunnel from user program?
I recently discovered the existence of Linux TUN/TAP interfaces and am still trying to understand them. I think I get the basic concept - pseudo devices are created which emulate a network interface ...
- 7,194
8
votes
2
answers
16k
views
apt-get via ssh-tunnel if only port 22 is allowed
I have a server which has only access to the outer world via port 22 (for the use of ssh from the server to other computers).
I want to install some packages via apt-get on this server.
Can I achive ...
- 17.4k
7
votes
2
answers
16k
views
Why are incoming packets on a TAP interface seen with tcpdump but not with iptables?
A program injects packets on a Linux TAP interface (these packets are coming from a virtual machine). Specifically, these are DHCP requests (so they're UDP). I can see the packets with tcpdump but not ...
6
votes
2
answers
10k
views
Can't forward traffic from eth to TUN/TAP
I'm trying to forward traffic from a physical interface enp5s0 to a virtual one tun0. The goal is to make tun0 receive essentially all packets from enp5s0.
First, I enable forwarding with a command
...
6
votes
2
answers
3k
views
Restart a specific reverse ssh tunnel?
I have multiple machines in the wild that open reverse ssh connections to my server. Each machine out there is using a different reverse ssh port, which I use to differentiate between the machines. I ...
- 421