SSH - Black Magic

Remote port forwarding - Public connections to my laptop on any network:
------------------------------------------------------------------------

ssh -R ${remote}:${local} remote

Initiated by the remote machine.
Example:
1.) Run this on your Mac

ssh -R *:2020:localhost:22  -i awskey.pem ec2-user@ec2-xx-xx-xxx-xxx.us-west-2.compute.amazonaws.com

2.) Then on AWS machine to access your Mac:

ssh macuser@localhost -p 2020

Local port forwarding:
-------------------------------------------------

ssh -L ${local}:${remote} remote

Initiated by the local machine.

3.) Dynamic port forwarding, SOCKS 5 proxy using '-D' flag


Original link:
https://vimeo.com/54505525

Using wget to download an ASP site

You can download an ASPX site, which asks for username/password for log in as follows:

First provide the username/password to the login page and save the cookie file.

wget --mirror -r \
--user-agent="" \
--keep-session-cookies --save-cookies cookies.txt \
--post-data '__VIEWSTATE=%2FwEPDwULLTE3MDc5MjQzOTdkZIP%2Fxc105yfz2jGFj4Nd3tPvrEeNara43fIRI5oAW%2Bwv&__EVENTVALIDATION=%2FwEWBAKisoyCAwLB2tiHDgK1qbSRCwL2k8O9DUQa5owMFDWzFnBoIDusNkznjB65a6zRyNETOEZfBM1o&txtUser=admin&txtPassword=admin&login_btn=Sign+In' \
-E -k -p http://www.xyz.com/Login.aspx

Then you can access other pages in the next step using the above generated cookie files.

wget --mirror -r \
--user-agent="" \
--keep-session-cookies --load-cookies cookies.txt \
-E -k -p http://www.xyz.com/Index.aspx

For details of the options, refer to the WGET manual i.e "man wget" :)

Finding your gateway IP address in Linux, windows and MAC

Original Source: http://wiki.amahi.org/index.php/Find_Your_Gateway_IP

• Windows:
  
  
  • Click Start > All Programs > Accessories > Command Prompt.
    
  • When Command Prompt is open, type the following command: ipconfig | findstr /i "Gateway" (You can copy & paste it in the command prompt; just right-click anywhere in the command prompt window and select Paste.)
    
  • You should see something like this:
    C:\Documents and Settings\administrator>ipconfig | findstr /i "Gateway"
Default Gateway . . . . . . . . . : 192.168.1.1
    
  • In this example, your default gateway (router) IP address is 192.168.1.1.

• Linux:
  
  
  • You'll need to open a Terminal. Depending on your Linux distribution, it can be located in the menu items at the top, or at the bottom of your screen. In this example, we will use Fedora. Click Applications > System Tools > Terminal.
    
  • When terminal is open, type the following command: ip route | grep default
    
  • The output of this should look something like the following:
    joe$ ip route | grep default
default via 192.168.1.1 dev eth0 proto static
    
  • In this example, again, 192.168.1.1 is your default gateway (router) IP address.

• Mac OS X:
  
  
  • Open the Terminal application. Do do this, click Finder > Applications > Utilities > Terminal.app.
    
  • When Terminal.app is open, type the following command: netstat -nr | grep default
    
  • This will output the following:
    joe$ netstat -nr | grep default
default 192.168.1.1 UGSc 50 46 en1
    
  • In this example, again, 192.168.1.1 is your default gateway (router) IP address.

Routing protocols

A good link to read about routing, various routing protocols IGP, OSPF and BGP is Module 7 at the link: http://nptel.iitm.ac.in/courses/Webcourse-contents/IIT%20Kharagpur/Computer%20networks/New_index1.html

http://nptel.iitm.ac.in/courses/IIT-MADRAS/Computer_Networks/index.php

Finding the open ports on a system

You can find the opened/used ports of the system using the netstat command.

netstat -an

Adding the additional switch "-b" to the above lists the process PID using each port.

If you want to search for any particular string in the output of netstat you can use the "find" command on windows system as follows:

netstat -an | find "97.107"