It kills me PMTU still can bite us. I remember when working at an ISP ~15 years ago and fighting PMTU issues all the time because we first tried to roll out ADS

It kills me PMTU still can bite us. I remember when working at an ISP ~15 years ago and fighting PMTU issues all the time because we first tried to roll out ADSL service with PPP and later bridging and there was a bit of overhead we didn't account for. Match that up with my bosses conviction that all ICMP should be blocked, led to fun times (he was also a big proponent of disabling STP -- because you know it could cause whacky loops..).