> On Jan 18, 2018, at 7:32 PM, William Herrin <b...@herrin.us> wrote: > > On Thu, Jan 18, 2018 at 7:14 PM, Jared Mauch <ja...@puck.nether.net> wrote: >> lets say i can >> send you a 9K packet. If you receive that frame, and realize you need >> to fragment, then it’s your routers job to slice 9000 into 5 x 1500. > > In practice, no, because the packet you sent had the "don't fragment" > bit set.
Which packet? Is there a specific CDN that does this? I’d be curious to see data vs speculation. > That means my router is not allowed to fragment the packet. > Instead, I must send the originating host an ICMP destination > unreachable packet stating that the largest packet I can send further > is 1500 bytes. > > You might receive my ICMP message. You might not. After all, I am not > the host you were looking for. :-) Nor is it likely the reply. - Jared
