Bah, never mind.. reading my PCAP wrong :-(
> On Jan 19, 2018, at 8:58 AM, Jared Mauch <ja...@puck.nether.net> wrote: > > > >> On Jan 18, 2018, at 8:44 PM, William Herrin <b...@herrin.us> wrote: >> >>> Which packet? Is there a specific CDN that does this? I’d be curious to >>> see >>> data vs speculation. >> >> Howdy, >> >> Path MTU discovery (which sets the DF bit on TCP packets) is enabled >> by default on -every- operating system that's shipped for decades now. >> If you don't want it, you have to explicitly disable it. Disabling it >> for any significant quantity of traffic is considered antisocial since >> routers generally can't fragment in the hardware fast path. > > I’m not seeing this in a PCAP capture to at least one CDN, either from my > host or from the CDN endpoint. > > I suspect you’re mistaken. > > - Jared > > PCAP: https://puck.nether.net/~jared/akamai.pcap
