Episode 231: Networking Part 2 with Steve Ovens - a podcast by Noah J. Chelliah

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 etcSet the switch to only allow access on the management VLan
Use firewall rules to allow or deny cross VLan access08:10 - Replace Unify with TP Link Omada? - Charlie
Checking it out, will get back to you09:00 - 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 routersBroadcast Domain - Any computer that can hear a broadcast packet
ARP Table - Table that matches switch port to mac addressComputers also keep ARP Tables - Including Host Name, MAC Address, IP Address
Rebooting a switch will cause it to rebuild the ARP TablePrivate 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 IPv6IPv6 packet types
AnycastMulticast
Link-LocalIPv6 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 addressesLink-Local - Automatically assigned, non route-able, Required for IPv6
Unique-Local - Private or Public route-able IP addressHost bit of IPv6 identifies your device across networks
41:50 Reading IPv6First hextet = IANA Assigned prefix
Second hextet = Your Geographical regionThird hextet = Your ISPFourth hextet = Your Network
Leading zeros can be omittedThis IP:
FE80:0ED1:0098:000A:0000:0000:0AEDCan be expressed like this:
FE80:ED1:98:A::AEDIPv6 Loopback address
::048:00 Getting an address
Computer sends an icmpv6 packet called a Router SolicitationThe 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 addressThe 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
AddressingAddress 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.

Further episodes of Ask Noah Show

Further podcasts by Noah J. Chelliah

Website of Noah J. Chelliah