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0answers
20 views

How to get information from sshd about established remote tunnels

I have a server running on which from many different places people log on via ssh and open remote ssh-tunnels to other places behind different firewalls. Now I want to try to get an overview, which ...
1
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1answer
31 views

Bridged TAP interface to virtualbox

I need bridged TAP interface on client side of my VPN to virtual machine. I use VirtualBox 4.3.12. But in Adapter Network options in Attached to: Bridged adapter I do not see my TUN adapter. I have ...
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0answers
26 views

Packets sent through TUN interface not routed

I have a C program attached to a TUN interface. In my C program, I'm building packets and writing them to the TUN interface. Now to check if packets are really sent from my TUN interface I use ...
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0answers
41 views

Local Client/Server communication using TUN interfaces

I want to establish a local communication between a client and a server using TUN interfaces. The client program will be attached to interface TUN1 and we suppose that it has IP address @IP1. The ...
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0answers
77 views

IPsec Tunnel mode - RoadWarriors configuration

I've the need to configure IPsec tunnel mode between a gateway with static NAT (let's say its public IP is 172.31.0.105) and a number of clients that are behind dynamic NAT. Reading through some ...
3
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1answer
53 views

What is the best way to create remote tunnel?

I have 3 Linux servers: 10.0.0.0/24 - (10.0.0.10) Linux server inside my LAN. 20.0.0.0/24 - (20.0.0.10) Linux server with HTTP Apache server 50.50.50.50/32 - Server on Amazon AWS which see ...
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1answer
70 views

Kernel optimiziations for ioctl AF_INET operations

Our server solution handles many tunnel operation requests (add/update/delete) using the ioctl interface, and the AF_INET address family socket. Aprox. numbers are 100 operations/minute with over 8k ...
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1answer
50 views

Error “ssh_exchange_identification” with Corkscrew

I'm trying to reach my ssh server (i'm behind a corporate proxy) so I tried to use Corkscrew. My ssh server is listening on port 443, I put sshd: ALL in my /etc/hosts.allow and there's nothing into my ...
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1answer
532 views

stunnel - how to setup stunnel to handle ssl and attach http with it?

I am running Google App Engine which is a http web server with some redirecting and other real-time stuff. But it does not have SSL to include so its unable to make HTTPS. Therefore, i was trying ...
2
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1answer
362 views

Transparent Ethernet over GRE not forwarding traffic

I am running on Linux 2.6.30.9 and have been trying to setup a transparent ethernet over GRE tunnel. The network topology used is as follows: I want to bridge PC1 and PC2 using Transparent Ethernet ...
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0answers
91 views

HTTP tunnel on debian through a web UI

Using webmin today I noticed that it has an interesting feature: an HTTP tunnel. I usually use openVPN (installed on a VPS that i rent) to access my home computer (which does not have a public IP). In ...
0
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2answers
330 views

GRE supported in kernel but iproute2 cant create GRE tunnel

Im trying to create IP over GRE tunnel but i get No such device: ip tunnel add gre0 mode gre remote 192.168.152.22 local 192.168.152.21 ttl 255 ioctl: No such device I have compiled GRE support in ...
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0answers
279 views

How to redirect/forward between a tun/tap device and a socket using linux tools?

I have a socks5 proxy that is bind to eth0. It opens two ports, Port1 is used to connect to remote (for example a http server), Port2 is to listen for clients to connect. Then I created a tun device. ...
2
votes
0answers
55 views

using udptunnel with openvpn

I'm trying to tunnel openvpn traffic (UDP protocol) over a firewall using udptunnel I can't use openvpn itself on TCP protocol. On the server I'm running udptunnel like this: udptunnel -s 9999 ...
1
vote
1answer
341 views

Dynamic port forwarding using socat

I'm trying to replicate the functionality of ssh -D <PORT> user@machineX to tunnel all my traffic from my current machine via machineX. I do not need the ssh shell open at all, I simply wish to ...
1
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1answer
252 views

Broadcast port to other computers after SSH reverse tunnelling

I have been reading on how to reverse tunnel and I am using this command: ssh -f -N -T -R25565:localhost:25565 dns.mindfulhacker.tk To forward my Minecraft server. My other server can connect to my ...
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0answers
133 views

PPP tunnel on a linux box using virtual tty

I am trying to create test setup to verify PPP packet flow though a custom PPP server. To do so, I want to create a PPP tunnel on a local computer using virtual serial ports using socat. ...
3
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2answers
671 views

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, ...
4
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1answer
2k 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 ...
2
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2answers
376 views

Getting internet to Linux VM without being detected by Network

I'm trying to get internet to a Linux VM (Backtrack 5 on VMWare Workstation). Unfortunately I was told to not "bridge" the connection from the VM because it could be detected by our companies network ...
0
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1answer
386 views

How can I mount a remote sshfs directory of an publicly inaccessible server on my inaccessible client machine?

This is an extension of the question by @Andrei How to mount remote SSHFS via intermediate machine? Tunneling? I'm in the same situation that I want to mount a remote directory, however the ...
1
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1answer
604 views

VPN, one server, multiple clients

I wanted to know if it was possible to have a server running OpenVPN with server key and have multiple clients connect to it? I would like the server to be 10.9.8.1, the first client to be 10.9.8.2 ...
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1answer
1k views

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 ...
0
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0answers
169 views

pptp differs between 3.7 and 3.8 linux kernel milestone with 3.2.0-4 milestone

Unfortunately, current kernel of debian has problem with my hardware: 3.2.0-4-686-pae , and when i compile one of 3.7.x milestone or 3.8.1 itself , my problem is solved. But my problem with new ...
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0answers
390 views

Packets not received by TUN device

I created a TUN device(nat64) and created a route so that all the required packets are forwarded to the TUN device from an eth device. But, I see that many packets are not received by the TUN device. ...
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2answers
496 views

OpenVPN uses wrong IP-Address

I've installed OpenVPN on a client (behind NAT-Router) and a VPS server. The tunnel is established. However, ping is only possible from client to server. The server uses its public IP address on tun0 ...
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0answers
285 views

Reverse tunnelling with “stunnel” in linux

Scenario: Central Log-Server(logserv)- only private IP interfaces Multiple client servers (logclient)- has public IPs. Requirement: Need to tcp logs of syslog application from various logclients ...
2
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7answers
2k views

Creating an HTTPS tunnel

I have a VPS. How do I connect to my server through HTTPS protocol and redirect my browser connections to the HTTPS connection? Currently I use SSH tunnel but it's too slow.
3
votes
1answer
2k views

ssh tunnel on ssh tunnel between Windows and two Linux machines

I have the following configuration and want to establish a tunnel on a tunnel. I read already the following topic: How to put a tunnel in a tunnel? My configuration: Notebook --> Linux Server A ...
2
votes
1answer
331 views

Should OpenVPN point to point tunnels be on different ports?

The OpenVPN cookbook shows an example for site-to-site VPN (3 sites). They configured each tunnel on a unique port: site A to site B: 1194 site A to site C: 1195 site B to site C: 1196 The author ...
2
votes
1answer
610 views

List ports tunnelled on OpenSSH server

Is there any way to list the tunnels that SSH clients connected to my OpenSSH server have set up? I can use e.g. lsof -i to show connections that are being actively tunnelled, but I'd like to be able ...
7
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1answer
6k 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 ...
3
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3answers
1k 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 ...
8
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1answer
3k 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 ...
3
votes
1answer
2k views

How do I configure OpenVPN as a Gateway client for Witopia?

I have the following setup: Witopia SSL account Synology 409 NAS (with OpenVPN and Apache etc) PS3 Mac Apple AirPort router (configured for NAT) Locked IPT-box (using DHCP and NAT traversing) - ...
4
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1answer
913 views

Tunnel traffic through another machine over ssh

I want to be able to route a portion of my traffic through another machine over SSH. For example, is it possible to browse the web through the ssh tunnel and also browse the web through your LAN ...
4
votes
5answers
9k views

How to route specific adresses 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 ...