01-13-2015
Yes, I completely agree.
Also, I am well aware of what a VPN is and how it functions, but as I said in my original post I would like to avoid using it. I am trying to achieve a functionality similar to what TeamViewer does, but now it seems that the easiest way to do that would be through a regular TCP socket connection over application-configurable port numbers.
10 More Discussions You Might Find Interesting
1. Programming
hi everybody and thank you for this wondefrul forum
this is my first thread posted here and i hope that i could find some help from your part (i am even sure) :D
here is the situation: i am to develop an application of remote desktop access such as vnc, vpn and especially nx
i want to develop... (0 Replies)
Discussion started by: bolboln01
0 Replies
2. UNIX for Advanced & Expert Users
Two question here, but it's only one on the protocol point of view.
If two persons use the same key to connect to a SSH server is there a risk they can decipher the other tunnel. In other terms is that less safe than if they have two separate keys.
Same question if two persons use the same user... (2 Replies)
Discussion started by: moi
2 Replies
3. UNIX for Advanced & Expert Users
I have initiated a tunnel for vncserver. now i want to stop it. is there any way except sleep option? (2 Replies)
Discussion started by: majid.merkava
2 Replies
4. IP Networking
I have situation:
- localhost L
- server A
- server B (currently accessible only from B, but it have key of my localhost - added when L have different location and can access directly to B)
problem:
how set tunnel from L to B and use key from localhost (I don't remember password to B)?
I... (0 Replies)
Discussion started by: lessmore
0 Replies
5. Cybersecurity
Hi all,
I'm trying have an alternative way of connecting into a Corporate network. Mostly in case the VPN down as I cannot also change the security policy.
I want to expose windows RDP over ssh tunnel.
I have 3 hosts in my scenario
1- Host a : Windows 2k8 has no internet access just only an... (3 Replies)
Discussion started by: h@foorsa.biz
3 Replies
6. UNIX for Dummies Questions & Answers
I'm trying to setup a link between my home pc (work-machine) and a server at work (tar-machine) that is behind a gateway (hop-machine) and not directly accessible.
my actions:
work-machine$ ssh -L 1234:tar-machine:22 hop-machine
work-machine$ ssh -p 1234 user@127.0.0.1
- shh access on... (1 Reply)
Discussion started by: Vathau
1 Replies
7. IP Networking
I have a Java web app on machine (X) that needs to talk to an LDAP server (Y) on :636, but the LDAP server is only accessible on a particular network.
I can login to a machine (Z) on that network from X, and this machine can talk to the LDAP server on :636.
How can I tunnel so that X can... (2 Replies)
Discussion started by: spacegoose
2 Replies
8. UNIX for Advanced & Expert Users
Hi all
I have a suite of scripts that ssh to remote servers within a cluster and run some tests. This is done from a central server so that all of the test results can be captured in one location.
Problem is I now have 509 tests and the number is growing. The scripts work by establishing a... (2 Replies)
Discussion started by: steadyonabix
2 Replies
9. Solaris
Hello Solaris experts:
Trying to bring the 11.3 gdm screen over ssh to a Linux Box:
I did the following:
1. made chanes to /etc/ssh/sshd_config & bounced ssh daemon:
# X11 tunneling options
X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost yes
2. From the remote Linux box:
... (6 Replies)
Discussion started by: delphys
6 Replies
10. UNIX for Advanced & Expert Users
I am not clear with the part of concept of Tunneling using ssh.
ssh -f -N -L 1029 192.168.1.47:25 james@192.168.1.47
I found out that above code works for me . but didn't quite well understood how ti works and need to ask you guys some questions.
since we are using tunnel through ssh ... (2 Replies)
Discussion started by: lobsang
2 Replies
tcp(4p) tcp(4p)
Name
tcp - Internet Transmission Control Protocol
Syntax
#include <sys/socket.h>
#include <netinet/in.h>
s = socket(AF_INET, SOCK_STREAM, 0);
Description
The TCP protocol provides reliable, flow-controlled, two-way transmission of data. It is a byte-stream protocol used to support the
SOCK_STREAM abstraction. TCP uses the standard Internet address format and, in addition, provides a per-host collection of ``port
addresses''. Thus, each address is composed of an Internet address specifying the host and network, with a specific TCP port on the host
identifying the peer entity.
Sockets utilizing the TCP protocol are either ``active'' or ``passive''. Active sockets initiate connections to passive sockets. By
default TCP sockets are created active; to create a passive socket the system call must be used after binding the socket with the system
call. Only passive sockets can use the call to accept incoming connections. Only active sockets can use the call to initiate connections.
Passive sockets can ``underspecify'' their location to match incoming connection requests from multiple networks. This technique, termed
``wildcard addressing'', allows a single server to provide service to clients on multiple networks. To create a socket that listens on all
networks, the Internet address INADDR_ANY must be bound. The TCP port can still be specified at this time. If the port is not specified,
the system will assign one. Once a connection has been established, the socket's address is fixed by the peer entity's location. The
address assigned the socket is the address associated with the network interface through which packets are being transmitted and received.
Normally, this address corresponds to the peer entity's network.
TCP supports one socket option that is set with and tested with Under most circumstances, TCP sends data when it is presented; when out-
standing data has not yet been acknowledged, it gathers small amounts of output to be sent in a single packet, once an acknowledgement is
received. For a small number of clients, such as window systems that send a stream of mouse events that receive no replies, this packeti-
zation may cause significant delays. Therefore, TCP provides a Boolean option, TCP_NODELAY (from to defeat this algorithm. The option
level for the call is the protocol number for TCP, available from
Diagnostics
A socket operation may fail with one of the following errors returned:
[EISCONN] Try to establish a connection on a socket which already has one.
[ENOBUFS] The system runs out of memory for an internal data structure.
[ETIMEDOUT] A connection was dropped due to excessive retransmissions.
[ECONNRESET] The remote peer forces the connection to be closed.
[ECONNREFUSED] The remote peer actively refuses connection establishment (usually because no process is listening to the port).
[EADDRINUSE] An attempt is made to create a socket with a port that has already been allocated.
[EADDRNOTAVAIL] An attempt is made to create a socket with a network address for which no network interface exists.
See Also
getsockopt(2), socket(2), inet(4f), intro(4n), ip(4p)
tcp(4p)