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Operating Systems Linux Ubuntu Connecting to a remote server Post 302279586 by linuxjunkie on Friday 23rd of January 2009 07:11:49 AM
Old 01-23-2009
Easy way to check it to use telnet.

To check if you can communicate with a internal mail server do the following.
from external pc.

telnet (Ip address of public nic on router) 25
eg. telnet 192.168.0.55 25

for a pop3 server connection change 25 to 110 and so on.

If you look at your firewall rules there must be a rule that says something along these lines.

"Allow in coming traffic from anywhere on port 22 to local ip address."

Now i assume that your internet router has a ipaddress on the local nic and one on the ppp+ port. So lets say your internal ip address is 192.168.0.254 and the ppp+ address is 42.253.200.110 (Assigned by your isp). now to allow a connection on port 22 (ssh) from the outside world you need to make a rule in your firewall that says this.

allow tcp traffic from anywhere on port 22 to 42.253.200.110. (Not sure what router you use).

If you have a internal server with ip address 192.168.0.115 that is separate from the router running a vnc service you would do something along these lines.

allow tcp traffic from anywhere on port 5900 to internal server 192.168.0.115

Then always remember to deny everything else from coming in as the last rule.

Hope this helps Smilie
 

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CONNECT-PROXY(1)					      General Commands Manual						  CONNECT-PROXY(1)

NAME
connect-proxy -- connect over SOCKS4/5 proxy SYNOPSIS
connect-proxy [-dnhst45] [-R resolve ] [-p local-port ] [-w secs ] [-H [user@]proxy-server[:port]] ] [-S [user@]socks-server[:port]] ] [-T proxy-server[:port] ] [-c telnet-proxy-command ] [host] [port] DESCRIPTION
connect-proxy open connection over SOCKS4/5 proxies Please, note that any HTTP-Proxy tunnel won't work with content-inspection firewall (unless using SSL). OPTIONS
-H specifies a hostname and port number of the http proxy server to relay. If port is omitted, 80 is used. You can specify this value in the environment variable HTTP_PROXY and pass the -h option to use it. -S specifies the hostname and port number of the SOCKS server to relay. Like -H, port number can be omitted and the default is 1080. You can also specify this value pair in the environment variable SOCKS5_SERVER and give the -s option to use it. -4 specifies SOCKS relaying and indicates protocol version to use. It is valid only when used with '-s' or '-S'. Default is '-5' (protocol version 5) -R method to resolve the hostname. Three keywords ("local", "remote", "both") or dot-notation IP address are acceptable. The key- word "both" means, "Try local first, then remote". If a dot-notation IP address is specified, use this host as nameserver. The default is "remote" for SOCKS5 or "local" for others. On SOCKS4 protocol, remote resolving method ("remote" and "both") requires protocol 4a supported server. -p will forward a local TCP port instead of using the standard input and output. -P same to '-p' except keep remote session. The program repeats waiting the port with holding remote session without disconnecting. To connect the remote session, send EOF to stdin or kill the program. -w timeout in seconds for making connection with TARGET host. -d used for debug. If you fail to connect, use this and check request to and response from server. USAGE
To use proxy, this example is for SOCKS5 connection to connect to "host" at port 25 via SOCKS5 server on "firewall" host. connect-proxy -S firewall host 25 SOCKS5_SERVER=firewall; export SOCKS5_SERVER; connect-proxy -s host 25 For a HTTP-PROXY connection: connect-proxy -H proxy-server:8080 host 25 HTTP_PROXY=proxy-server:8080; export HTTP_PROXY; connect-proxy -h host 25 To forward a local port, for example to use ssh: connect-proxy -p 5550 -H proxy-server:8080 host 22 ssh -l user To use it along ssh transparently: # file://~/.ssh/config # not using proxy on lan Host 192.* ProxyCommand connect-proxy %h %p # mandatory to access the internet Host * ProxyCommand connect-proxy -H proxyserver:8080 %h %p Or for all users ( /etc/ssh/ssh_config ) ENVIRONMENT
SOCKS5_USER, SOCKS5_PASSWORD, HTTP_PROXY_USER, HTTP_PROXY_PASSWORD, CONNECT_PASSWORD, LOGNAME, USER SEE ALSO
ssh (1). WWW
http://www.meadowy.org/~gotoh/projects/connect AUTHOR
This manual page was written by Philippe Coval rzr@gna.org for the Debian system (but may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version published by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL. CONNECT-PROXY(1)
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