Linux IP Commands

Display Current Config for all NIC’s: ifconfig

Display Current Config for eth0: ifconfig eth0

Assign IP: ifconfig eth0 192.168.1.2

Ping: ping -c 3 192.168.1.1

Assign multiple IP’s: ifconfig eth0:0 192.168.1.2

Assign second IP: ifconfig eth0:1 192.168.1.3

Disable network card: ifconfig eth0 down

Enable network card: ifconfig eth0 up

View current routing table: route “or” route -n

View arp cache: arp “or” arp -n

Assign IP/Subnet: ifconfig eth0 192.168.1.2 netmask 255.255.255.0

Assign Default Gateway: route add default gw 192.168.1.1

Trace Route: traceroute www.whatismyip.com

Trace Path: tracepath www.whatismyip.com

DNS Test: host www.whatismyip.com

Advanced DNS Test: dig www.whatismyip.com

Reverse Lookup: host 66.11.119.69

Advanced Reverse Lookup: dig -x 66.11.119.69

*You MUST be at the ROOT user to make/save any changes. Linux users, your distribution will determine the location of your network config file which will need to be updated and saved in order for the changes to remain in effect after rebooting. Network cards are referred to as eth0, eth1, eth2, etc based on their position on the PCI bus.
*Special thanks to Gergely for the Linux commands!

Read more: http://www.whatismyip.com/linux-ip-commands/#ixzz2RourEU7X

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SSH TUNNELING ON ANDROID

If you want to have a secure browsing environment or just want to access your home network securely without exposing extra services to the internet and without the mess that comes with setting up and maintaining a VPN server, ssh tunneling is your rescuer. In this post, I’ll tell you how to setup an ssh tunnel to your home network easily. Also look for some bonus tips at the end 

This article assumes that you have already installed and setup a ssh server (you can probably use openssh). Also, it assumes that the ssh server is accessible from the internet (i.e. you have appropriately forwarded the port on which ssh server is running). I’d also recommend that if you do not have a static IP for your home network, then sign up for a dynamic DNS service (I use dyndns.org) so that you can access your home network easily by using a domain name (e.g. myserver.dyndns.org) from outside.

Now, here is a step by step guide on what to do on your Android Phone (I’m doing this on a Nexus one but should be same for you as well):1. Install an app called “connectbot” from the android marketplace. It is a FREE ssh client for android.

1. Open it and add the IP (or dynamic domain name as suggested above) and the port on which ssh server is running to the bottom and connect.

2. Once connected, press the menu button and select the icon which says “Port Forwards”

3. On this screen you can configure the ports to be used for tunneling.

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