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Episode 231: Networking Part 2 with Steve Ovens

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Manage episode 292284987 series 1412429
Inhoud geleverd door Noah J. Chelliah. Alle podcastinhoud, inclusief afleveringen, afbeeldingen en podcastbeschrijvingen, wordt rechtstreeks geüpload en geleverd door Noah J. Chelliah of hun podcastplatformpartner. Als u denkt dat iemand uw auteursrechtelijk beschermde werk zonder uw toestemming gebruikt, kunt u het hier beschreven proces https://nl.player.fm/legal volgen.

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
  1. Computer sends an icmpv6 packet called a Router Solicitation
  2. The router responds with its information (with its Link Local address)
  3. Either the router generates an ipv6 based on the requesting computers MAC address OR the computer chooses its own IP address
  4. 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 --

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

Phone Systems for Ask Noah provided by Voxtelesys

Join us in our dedicated chatroom #GeekLab:linuxdelta.com on Matrix

-- Stay In Touch --

Find all the resources for this show on the Ask Noah Dashboard

Ask Noah Dashboard

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

Contact Noah

live [at] asknoahshow.com

-- Twitter --

Special Guest: Steve Ovens.

Support Ask Noah Show

  continue reading

382 afleveringen

Artwork
iconDelen
 
Manage episode 292284987 series 1412429
Inhoud geleverd door Noah J. Chelliah. Alle podcastinhoud, inclusief afleveringen, afbeeldingen en podcastbeschrijvingen, wordt rechtstreeks geüpload en geleverd door Noah J. Chelliah of hun podcastplatformpartner. Als u denkt dat iemand uw auteursrechtelijk beschermde werk zonder uw toestemming gebruikt, kunt u het hier beschreven proces https://nl.player.fm/legal volgen.

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
  1. Computer sends an icmpv6 packet called a Router Solicitation
  2. The router responds with its information (with its Link Local address)
  3. Either the router generates an ipv6 based on the requesting computers MAC address OR the computer chooses its own IP address
  4. 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 --

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

Phone Systems for Ask Noah provided by Voxtelesys

Join us in our dedicated chatroom #GeekLab:linuxdelta.com on Matrix

-- Stay In Touch --

Find all the resources for this show on the Ask Noah Dashboard

Ask Noah Dashboard

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

Contact Noah

live [at] asknoahshow.com

-- Twitter --

Special Guest: Steve Ovens.

Support Ask Noah Show

  continue reading

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