In this episode Steve joins us again to discuss networking. Building on the knowledge from our last episode we dig further into ipv6 and other network technology!

-- During The Show --

01:00 - VLAN question - Scott

Management VLan is for admin not printers etc
Set the switch to only allow access on the management VLan
Use firewall rules to allow or deny cross VLan access

08:10 - Replace Unify with TP Link Omada? - Charlie

Checking it out, will get back to you

09:00 - Just FYI problem accessing Wireguard tutorial - Paul

New Wireguard Tutorial

09:30 - What Router Should I buy? - Nik

Netgate SG-1100

12:15 IPv4

Broadcast traffic - sends a packet to everyone, not forwarded by routers
Broadcast Domain - Any computer that can hear a broadcast packet
ARP Table - Table that matches switch port to mac address
Computers also keep ARP Tables - Including Host Name, MAC Address, IP Address
Rebooting a switch will cause it to rebuild the ARP Table
Private IP Addresses - IPv4 Addresses set aside for internal networks
RFC 1918
NAT - Network Address Translation - Public IP <-> Private IP
[IP Chicken](ipchicken.com)
Router typically hands out DNS Server+IP Address+Hostname

30:00 IPv6

IPv6 packet types
- Anycast
- Multicast
- Link-Local
IPv6 Anycast - Send out a packet to an IP address, expecting multiple devices to have the same IP Address but only the closest responds
IPv6 Multicast - Tries to only hit intended IP addresses
Link-Local - Automatically assigned, non route-able, Required for IPv6
Unique-Local - Private or Public route-able IP address
Host bit of IPv6 identifies your device across networks

41:50 Reading IPv6

First hextet = IANA Assigned prefix
Second hextet = Your Geographical region
Third hextet = Your ISP
Fourth hextet = Your Network
Leading zeros can be omitted

This IP:

FE80:0ED1:0098:000A:0000:0000:0AED

Can be expressed like this:

FE80:ED1:98:A::AED
IPv6 Loopback address
::0

48:00 Getting an address

Computer sends an icmpv6 packet called a Router Solicitation
The router responds with its information (with its Link Local address)
Either the router generates an ipv6 based on the requesting computers MAC address OR the computer chooses its own IP address
The computer sends a Neighbor Solicitation packet which is basically the computer attempting to ping a device on the network with its IP address to see if its chosen IP already exists

IPv6 you are on the internet by default unlike IPv4 in most setups
"Host" bits are based on your MAC address, which can be used for finger printing/tracking

Addressing

Address broken into hextets

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