MTU to CDN's
jared at puck.nether.net
Fri Jan 19 14:01:11 UTC 2018
Bah, never mind.. reading my PCAP wrong :-(
> On Jan 19, 2018, at 8:58 AM, Jared Mauch <jared at puck.nether.net> wrote:
>> On Jan 18, 2018, at 8:44 PM, William Herrin <bill at herrin.us> wrote:
>>> Which packet? Is there a specific CDN that does this? I’d be curious to see
>>> data vs speculation.
>> 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
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