One of the oddities of the Plusnet Broadband infrastructure I’ve seen occurs around 1am to 2am in the morning. A forced reconnect/renegotiation appears to take place around this time, most or all days, leading to changes in achievable throughput and latency. Whether this is just on my line, the cabinet serving the line, or at a national level, I'm unsure. This is unnoticeable if your equipment automatically reconnects.
I’ve noticed the last few days, after working with the configuration of my SRX, the PPPoE to the VDSL modem drops and stays down around this time.
In my case, tinkering in the Wizard led to an overwrite of parts of the configuration, removing the following lines that are essential to keep the pp interface up:
pppoe-options {
underlying-interface ge-0/0/4.0;
idle-timeout 0;
auto-reconnect 10;
client;
}
A number of the other MTU settings and similar were also rewritten, and needed to be restored.
November 28, 2020