Episode 231: Networking Part 2 with Steve Ovens

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 (http://ost.altspd.com/kb/faq.php?id=201) 09:30 - What Router Should I buy? - Nik Netgate SG-1100 (https://shop.netgate.com/products/1100-pfsense) 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 (https://datatracker.ietf.org/doc/html/rfc1918) 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 https://i.imgur.com/9dZgNxD.png -- The Extra Credit Section -- For links to the articles and material referenced in this week's episode check out this week's page from our podcast dashboard! This Episode's Podcast Dashboard (http://podcast.asknoahshow.com/230) Phone Systems for Ask Noah provided by Voxtelesys (http://www.voxtelesys.com/asknoah) Join us in our dedicated chatroom #GeekLab:linuxdelta.com on Matrix (https://element.linuxdelta.com/#/room/#geeklab:linuxdelta.com) -- Stay In Touch -- Find all the resources for this show on the Ask Noah Dashboard Ask Noah Dashboard (http://www.asknoahshow.com) Need more help than a radio show can offer? Altispeed provides commercial IT services and they’re excited to offer you a great deal for listening to the Ask Noah Show. Call today and ask about the discount for listeners of the Ask Noah Show! Altispeed Technologies (http://www.altispeed.com/) Contact Noah live [at] asknoahshow.com -- Twitter -- Noah - Kernellinux (https://twitter.com/kernellinux) Ask Noah Show (https://twitter.com/asknoahshow) Altispeed Technologies (https://twitter.com/altispeed) Special Guest: Steve Ovens.