Learning about slightly more advanced networking with linux

Paul Warren

Mastodon: @pwarren@mastodon.thewarrens.name

email: paul at thewarrens.name

© 2021 Paul Warren

CC BY-NC-SA

! WARNING !

I am not a network engineer, there are gaps in my knowledge

The words I use might not be the correct ones

Please don't blame me if your network stops networking

Maybe don't go and try building an ISP based off this talk :)

What even is a network

Ethernet?

Token Ring?

IPX?

AX.25?

What even is a network

ipv4?

ipv6?

tcp?

Allows connections between computers

Managed network?

Controls connections between computers

Scales connections between computers

Layers!

Like an onion!

That 7 layer thing from the OSI

Administrative overlays

VPNs and Tunnels

Layers!

This means something something Physical/Logical disconnect

Networks are also a bit fractal in nature

For the purposes of this talk, we can ignore a lot of complexity

What we're familiar with

Diagram showing standard leaf node of a network with a bit cloud containg "The rest of the org"

>What we're familiar with

Diagram showing added storage and server network

>How things evolve

Uh Oh, we've got a new Datacentre

>How things evolve

which has its own lot of storage and servers

Anyway, let's get started!

What even is a router?

Two or more interfaces

Some logic to determine where a packet goes

Linux Routing

net.ipv4.ip_forward = 1
net.ipv6.conf.all.forwarding = 1
net.ipv6.conf.default.forwarding = 1
	    
	  

And we're done!

Yeah, not really :)