I've done a lot of digging since my eariler posts. The issue is actually caused by Vodafone using Path finder to balance their network capacity.
The way this is achieved is by changing the customers gateway to a less congested location. In the case of Vodafone, this often tends to be Edinburgh. If you are located down South, this means your traffic has to go all the way to Edinburgh and then all the way back down to their London data center. I'm in Bucks and this round trip ads around 20ms to my ping times.
There is a huge thread on the Vodafone forum. Unfortunately, it's basically just a handful of users handing out false information that a fix is coming. It isn't, the routing we now see is to ensure customers get their advertised download speeds.
For those interested, here is a trace route
Tracing route to
www.google.com [142.250.200.4]
over a maximum of 30 hops:
1 1 ms <1 ms <1 ms RT-AX92U-6090 [192.168.50.1]
2 14 ms 13 ms 13 ms 90.247.128.1
3 24 ms 24 ms 24 ms 63.130.172.45
4 25 ms 27 ms 27 ms 72.14.216.236
5 27 ms 28 ms 26 ms 216.239.42.41
6 28 ms 33 ms 26 ms 108.170.234.231
7 24 ms 23 ms 25 ms lhr48s29-in-f4.1e100.net [142.250.200.4]
Let's just hope other ISP's don't adopt this model.
Edited by bluebull (Mon 06-Mar-23 13:30:53)