Post ASu7ZOdFJIwvmooUiG by s3lph@chaos.social
(DIR) More posts by s3lph@chaos.social
(DIR) Post #ASu7ZN478RFkvZMvJY by s3lph@chaos.social
2022-11-30T21:25:26Z
7 likes, 7 repeats
Customer's project analysis: "A 3-node cluster is not possible because of network limitations (an ethernet cable only has two ends!)"Long story short: To prove a point, I built a twisted-pair Ethernet "cable" with 3 ends. I've only gotten it to work with 10BASE-T and autonegotiation disabled though.
(DIR) Post #ASu7ZOdFJIwvmooUiG by s3lph@chaos.social
2022-11-30T22:36:19Z
1 likes, 1 repeats
This is how the wires are connected: It takes e.g. the Tx differential pair of plug A, and one of the wires goes to the corresponding Rx wire of B and the other one to the corresponding Rx wire of C.I'm not even sure whether I've fully understood what's happening to make this actually work, since the signal is encoded in the difference between the now broken apart differential pairs... But it DOES work!
(DIR) Post #ASu8AGXcM2kTPLlHJg by newt@stereophonic.space
2023-02-21T12:36:32.901549Z
0 likes, 0 repeats
@s3lph congrats on re-inventing Token Ring!
(DIR) Post #ASuOIQPX8rXTbKtPrU by feld@bikeshed.party
2023-02-21T15:37:09.566711Z
1 likes, 0 repeats
This is a power few are prepared to wield
(DIR) Post #ASuOemdzA0dUvWJWoS by Moon@shitposter.club
2023-02-21T15:41:40.719582Z
0 likes, 0 repeats
@newt @s3lph its reinventing a 1990s hub not a token ring, token ring mitigates collisions.
(DIR) Post #ASuOnNGgsNhYpcVx0C by Moon@shitposter.club
2023-02-21T15:43:14.707413Z
0 likes, 0 repeats
@newt @s3lph old hubs used to just repeat every port to every other port which is pretty similar to just splicing a cable to multiple ports unless i'm missing something (i could be missing something)
(DIR) Post #ASuP3Onewt64DQZnkm by teknomunk@apogee.polaris-1.work
2023-02-21T15:46:05Z
0 likes, 0 repeats
@Moon @newt Sounds about right. The hub would amplify/regenerate the signals so attenuation due to cable length isn't a problem. Signal propigation delay still is.
(DIR) Post #ASuP3a3J739L78yxAe by newt@stereophonic.space
2023-02-21T15:44:32.129476Z
0 likes, 0 repeats
@Moon @s3lph so does Ethernet. There is collision detection.
(DIR) Post #ASuP8nkjbOoB3MmhCi by feld@bikeshed.party
2023-02-21T15:43:27.417737Z
1 likes, 0 repeats
yeah this isn't token ring, this is a single collision domain
(DIR) Post #ASuP8q9yeWBkWEbspM by feld@bikeshed.party
2023-02-21T15:44:35.952632Z
1 likes, 0 repeats
Hubs = 1 broadcast domain, 1 collision domainLayer 2 switches = 1 broadcast domain, and a separate collision domain for each physical interfaceLayer 3 switches = 1 broadcast domain per VLAN, and a separate collision domain for each physical interface
(DIR) Post #ASuP9KcNPUjMz07zG4 by Moon@shitposter.club
2023-02-21T15:47:12.883189Z
1 likes, 0 repeats
@newt @s3lph i mean that an old style hub doesn't do it. switches are traffic-aware and do it
(DIR) Post #ASuPCSF1WVK1Ukh4nA by lain@lain.com
2023-02-21T15:42:29.781134Z
2 likes, 0 repeats
@s3lph finally, a chaos.social post that deserves the name
(DIR) Post #ASuPqSuaRy8p9pDHt2 by Moon@shitposter.club
2023-02-21T15:54:58.572262Z
0 likes, 0 repeats
@feld @s3lph @newt i looked again and i may be uncharitable comparing it to just a splice. i take back my comparison because I'm too lazy to figure out what's actually going on.
(DIR) Post #ASuQ6xD1Za8zkxhRVw by feld@bikeshed.party
2023-02-21T15:57:42.488804Z
0 likes, 0 repeats
it really is a 10mbit hub. they were passive, not powered.
(DIR) Post #ASuQB80vLJMGQR1w6y by Moon@shitposter.club
2023-02-21T15:58:41.951339Z
0 likes, 0 repeats
@feld @s3lph @newt just playing it safe because this is not my domain
(DIR) Post #ASuXutOoi9Qe6ByWUi by Moon@shitposter.club
2023-02-21T17:25:26.498870Z
1 likes, 0 repeats
@lispi314 @s3lph @newt yes.
(DIR) Post #ASuqjrEWK3U7KBbvQ8 by smallsees@social.dropbear.xyz
2023-02-21T20:55:54Z
0 likes, 0 repeats
@s3lph Definitely art.There are are some strange failure modes where the Rx pair is broken and tx still works. It looks like you have made three of them.Higher speeds probably need negotiation which is why they won't work.