IP notes

General

What is the IP network?

deliver things to its destination in the internet

hop by hop protocol between two adjacent devices
(compare with host to host protocols - tcp, udp, http, dns )

how things (aka ip packets) get routed

what is IP address

reliable? no. why not?
connection? no. why not?
what if packet get lost?

what if packet rambles?

what if packet is too big?

IP Address

What is an IP address?

Class, Classless CIDR

slash, subnet mask

v4, v6

Get my IP address

static, dynamic

DHCP

How do I know my IP address?

ipconfig, renew

How come so many people has 192.168.1.xxx?

NAT

Do I need one IP address for every computer?

NAT, why, how

NAT with port, why, how

What problem it solves?

What problem it creates?

What are the limitations of NAT?

can I create a server inside NAT?

What is my external ip address then?

how can I find it?

Who does administrations of this network?

ICMP

ping, why

traceroute, how

Routings

The magic of internet, routing tables.

what does it look like?

how to construct one?

centralized vs distributed

shortest path

how does it work?

intuitively correct? (do you or google use similar algorithm in trips?)

limitations and assumptions? (complete topology and link cost)

precursor to SDN?

distance vector

what if topology is hard to come by

rely on your trusted neighbors

limitations (count to infinity)

What does a router do?

what's in a router?

how does it process a packet?

how many different kinds of packets are there?

does the router care?