Sunday, May 8, 2016

Setting up LAN with BSNL router AN 1020-21

An abstract overview for building a LAN is presented here, you can use the essence of article to build LAN with any other router you can lay your hands on. That said don't confuse modem with router, most routers are modem but a modem simply can't be router*

Post is written in the hope that reader is equipped with basic knowledge about connecting line to splitter to router to device you want to use. It is assumed the your modem is configured for both wireless and ethernet access.

My work requires that I interact daily with servers using putty or such terminal emulator, gradually I loved doing work the *nix way. This made me install Cygwin in almost every machine I use, thanks to MobaXTerm I need not do that anymore :) Off story on to TODO.

1. Connect the machines you want to use to Router
That's all! Your router takes care of establishing (W)LAN

Surprisingly simple to establish LAN, but the hard part is knowing how to use the systems connected in the network. Here is the network topology in my home

Topology | Click to enlarge
If you have the habit of naming your computers you are almost saved. I have the habit, my phone is called owl, my laptop is beast, old machine that runs lubuntu is called delta (I have no idea why I gave such names). If you have given names to your machine try pinging them with names.

C:\Users\nemo>ping delta

Pinging delta.local.lan [] with 32 bytes of data:
Reply from bytes=32 time=2ms TTL=64
Reply from bytes=32 time=2ms TTL=64
Reply from bytes=32 time=1ms TTL=64
Reply from bytes=32 time=2ms TTL=64

Ping statistics for
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 2ms, Average = 1ms

C:\Users\nemo>ping -a localhost

Pinging beast [::1] with 32 bytes of data:
Reply from ::1: time<1ms
Reply from ::1: time<1ms
Reply from ::1: time<1ms
Reply from ::1: time<1ms

Ping statistics for ::1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

Yes,Yes you are awesome, the second ping was target at localhost with request to resolved domain name at it turned out to be beast, cool ways to prove you know commands duh...

What to do when you haven't named, or have named but no response?

1. Go to Router admin page
For BSNL unless you have not tinkered,
Username : admin
Password : admin
2. Locate the DNS Host listing page
3. Verify if your device is connected, oh yes there will be a domain name by default if you haven't overridden you can see it here.

DNS listing | Click to enlarge

You might ask... why were you talking about putty. well as I told already I have lubuntu installed in my old machine which I intend to use for stupidity ;) I have installed open-ssh-server on it and now I'll be able to connect to it via any terminal emulator

Normally domain name is enough to connect, if your tool finds it difficult use domain_name.local.lan . Here I'm going to connect to delta from beast with MobaXTerm Personal.

     │                • MobaXterm Personal Edition v7.7 •                 │
     │            (X server, SSH client and GNU/Cygwin tools)             │
     │                                                                    │
     │ ➤ Your computer drives are accessible through the /drives path     │
     │ ➤ Your DISPLAY is set to                          │
     │ ➤ When using SSH, your remote DISPLAY is automatically forwarded   │
     │ ➤ Each command status is specified by a special symbol (✔ or ✘)    │
     │                                                                    │
     │ • Important:                                                       │
     │ This is MobaXterm Personal Edition. The Professional edition       │
     │ allows you to customize MobaXterm for your company: you can add    │
     │ your own logo, your parameters, your welcome message and generate  │
     │ either an MSI installation package or a portable executable.       │
     │ We can also modify MobaXterm or develop the plugins you need.      │
     │ For more information:    │

[2016-05-08 23:27.23]  ~
[nemo.beast] ➤ ssh shiva@delta
Warning: Permanently added 'delta' (RSA) to the list of known hosts.
shiva@delta's password:
Welcome to Ubuntu 14.04.4 LTS (GNU/Linux 3.19.0-25-generic i686)

 * Documentation:

241 packages can be updated.
0 updates are security updates.

Last login: Sun May  8 22:15:20 2016 from beast.local.lan

See ya!

Modem : Connects you to Internet. Think like connects 1 device to internet
Router : Connects all the devices connected to it to Internet. Think about Wifi modem as we casually call it. It is router.

You can ask what is the difference. Think like this, you and your dad are connect to your home wifi. Your dad is paying bills late night (bcoz dad's are responsible figure). You are having nasty chat with your friend(s) . If router doesn't do the job correctly the snapchat picture aimed at you might be received in your dad's device... imagine he'd be paying LIC premium and seeing naked mole rat instead of Receipt "Payment is successful" :D

Technically router takes care of delivering response to correct device which made the request by establishing LAN internally :)