On Thu, Jan 18, 2018 at 7:41 PM, Jared Mauch <jared@puck.nether.net> wrote:
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.
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. Regards, Bill -- William Herrin ................ herrin@dirtside.com bill@herrin.us Dirtside Systems ......... Web: <http://www.dirtside.com/>