this post was submitted on 29 Oct 2026
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Lemmy Shitpost

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(have mercy on me networking nerds, I'm still learning)

top 19 comments
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[–] jj4211@lemmy.world 5 points 23 hours ago

Fun fact, ipv6 was designed to fix this. Everything is multicast and, in theory, a switch could snoop MLD and create a nice map so that "where is the router?" Would send only to routers, and "whose got this up address?" Would send to a small group, usually with only the correct target in it.

However, it's almost always just blasted out to everyone, and every network I've seen that has the mld snooping actually trying to do something just breaks ipv6 in various ways.

[–] uss_entrepreneur@startrek.website 31 points 1 day ago (2 children)

See also: WHO HAS 192.168.3.1 TELL 192.168.3.100

[–] sundray@lemmus.org 18 points 1 day ago (1 children)

Now now, there’s no need to ARP on and on about this…

[–] uss_entrepreneur@startrek.website 7 points 1 day ago (1 children)
[–] boobookittyfrick@lemmy.zip 4 points 13 hours ago* (last edited 13 hours ago)

Holy fuck you guys are nerds

[–] MrPommeroy@piefed.social 8 points 1 day ago

When you plug in a network cable, this is some next level shit..

[–] rockSlayer@lemmy.blahaj.zone 13 points 1 day ago (4 children)
[–] nonentity@sh.itjust.works 4 points 23 hours ago

Localhost is wherever you are, ~ is home.

[–] oha@lemmy.pobierz.net 5 points 1 day ago

what about ::1?

[–] MonkderVierte@lemmy.zip 2 points 1 day ago* (last edited 15 hours ago)

Btw, you should replace 127.0.1.1 with a permanent address. It was just a workaround for Gnome.

[–] BigBrownBeaver@lemmy.world 8 points 1 day ago

Oh hi neighbor. Mine is 127.0.0.2

[–] Gonzako@lemmy.world 2 points 1 day ago (1 children)
[–] Treczoks@lemmy.world 5 points 22 hours ago

When your computer connects to the network, it asks for it's address on the network. As it does not know where to ask, it sends a broadcast message to all computers on the same network (address 255.255.255.255). The service it wants to read is the DHCP service located on the servers' port 67, therefore the :67 after the address.

The address it gets in return is always only temporary. The server admin can define how long such lease lasts, and when a computer calls the DHCP again later (before the lease runs out) it gets the same address, and the lease timer starts again.

Some networks with high turnover (guest networks in a cafe, or similar) have rather fast lease expiries, therefor leading to regular requests.

[–] mvirts@lemmy.world 8 points 1 day ago (1 children)
[–] rounding_error@lemmy.today 10 points 1 day ago (1 children)

flashbacks to when I had to figure out PXE boot

[–] imadethis@fedinsfw.app 4 points 1 day ago

Flashbacks to this week learning about it and its nice big vulnerability.

[–] zurohki@aussie.zone 1 points 1 day ago* (last edited 1 day ago)

All the cool kids are doing ICMPv6 router solicitation, DHCP discover is so last decade.