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
09:30 - What Router Should I buy? - Nik
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
-- The Extra Credit Section --
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Special Guest: Steve Ovens.