default installation does not connect to ether

Bug #1844889 reported by SiKing on 2019-09-21
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Raspbian
Undecided
Unassigned

Bug Description

I just installed 2019-07-10-raspbian-buster (straight up, not noobs) on an RPi3B.
Connected all cables including *wired ether* and booted up.
I have no Internet!

The "Welcome to Raspberry Pi" first time setup says my IP is 169.254.200.14.
If I hover-over the network icon, it says "eth0: Configured 192.168.0.12/24" which agrees with the device list on my router/modem. The hover-over also says "eth0: Expired IPv4LL".

If I connect to WiFi, then everything works as expected.
Also worth pointing out that if I connect the same ether wire to another device (Linux laptop), then after a moment I get an IP and everything works as expected.

What am I missing?

SiKing (mark-lehky) on 2019-09-26
description: updated
description: updated
description: updated
SiKing (mark-lehky) on 2019-09-26
tags: added: networking
SiKing (mark-lehky) wrote :

SOLVED!

After a weekend of Googling and trying different things, I discovered the problem was my ether cable is too long. Although the spec says 100 metres is max, and mine was well below that, there was additional signal degradation due to (probably!) poor splices.
My cable was: 20ft to a wall plug, estimating 50ft inside the wall (and I do not know what is inside my walls) to a splice, and another 8ft to the router. Well below the 100 metres (~325ft), but the splices degrade the signal too much, I guess.

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