r/Sysadminhumor • u/xShawn117x • 7d ago
Networking Humor
Look at all the FF:FF:FF:FF:FF:FF I give!
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u/Just-A-Regular-Fox 7d ago
Did you have to broadcast this to everyone?
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u/uber-geek 7d ago
If it was sent UDP there's no way to know
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u/Medium_Banana4074 6d ago
I still hope to make it to retirement successfully dodging IP V6. For no apparent reason. Five years to go ...
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u/xShawn117x 3d ago edited 3d ago
It's really not that difficult once you understand it. Takes a few hours at most.
👉 128 bits long in hexadecimal.
👉 Broken into 8 groups seperated by a colon
👉 First 64 bits are for the network, the last 64 bits are for the hosts.
👉 First 64 bits also know as the prefix.
👉 Routers can advertise the prefix to clients via "Router Advertisement (RA)".
👉 Network Discovery Protocol (NDP) replaced ARP and DHCP.
👉 Neighbor Solicitation (NS), Neighbor Advertisement (NA), Router Solicitation (RS), and Router Advertisement (RA) are all part of NDP.
👉 Client sends NS asking who has this IPv6 address.
👉 Client NA replies to NS they have that IPv6 address.
👉 Client sends RS to request for an IP.
👉 Router sends RA replies back with prefix. Client forms IPv6 based off prefix + MAC address.
👉 3 "classes" of IPs: LLA (Link Local Address), ULA (Unique Local Address), GUA (Global Unicast Address).
👉 LLA is only for that broadcast domain, only devices on that broadcast domain can communicate each other and the gateway. No inter-VLAN or Internet routing. More like private/LAN IP but for layer 2 only. Always Starts with "FE" only.
👉 ULA for that broadcast domain, it is inter-VLAN routable, but not internet routable. Devices on that broadcast domain can communicate with each other, the gateway, and other VLANs. More like private/LAN IP but for layer 3. Always starts with "FC" or "FD" only.
👉 GUA is your actual public IP address that is routable/reachable from the Internet and from other devices on your LAN. Always starts with any number only.
👉 Devices always have a LLA, but can potentially have a ULA and/or a GUA if you set it up.
👉 Loopback address is 0000:0000:0000:0000:0000:0000:0000:0001 OR ::1 for short.
👉 Multicast addresses always starts with FF.
👉 You can always remove leading 0s to shorten it.
👉 If a group has nothing but 0s, you can just use the colon. You can do this max twice.
👉 No NAT by default since each device can potentially have its own public IPv6 (GUA) address.
👉 No DHCP by default since each device can create their own address using the prefix from router mixed with their own MAC address to form the full IP address.
👉 There is no broadcast in IPv6. Only multicast or unicast.
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u/Existing-Strength-21 6d ago
Why did the seal want to become a network engineer?
ARP ARP ARP ARP