On Jan 18, 2018, at 7:32 PM, William Herrin <bill@herrin.us> wrote:
On Thu, Jan 18, 2018 at 7:14 PM, Jared Mauch <jared@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