nanog mailing list archives
Re: MTU to CDN's
From: Jared Mauch <jared () puck nether net>
Date: Fri, 19 Jan 2018 08:58:19 -0500
On Jan 18, 2018, at 8:44 PM, William Herrin <bill () 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
Current thread:
- Re: MTU to CDN's, (continued)
- Re: MTU to CDN's Vincent Bernat (Jan 09)
- Re: MTU to CDN's Dovid Bender (Jan 18)
- Re: MTU to CDN's George Michaelson (Jan 18)
- Re: MTU to CDN's Mark Andrews (Jan 18)
- Re: MTU to CDN's George Michaelson (Jan 18)
- Re: MTU to CDN's Jared Mauch (Jan 18)
- Re: MTU to CDN's William Herrin (Jan 18)
- Re: MTU to CDN's Owen DeLong (Jan 18)
- Re: MTU to CDN's Jared Mauch (Jan 18)
- Re: MTU to CDN's William Herrin (Jan 18)
- Re: MTU to CDN's Jared Mauch (Jan 19)
- Re: MTU to CDN's Jared Mauch (Jan 19)
- Re: MTU to CDN's William Herrin (Jan 19)
- Re: MTU to CDN's Vincent Bernat (Jan 09)
- Re: MTU to CDN's Radu-Adrian Feurdean (Jan 19)
- Re: MTU to CDN's Mark Andrews (Jan 19)
- Re: MTU to CDN's Mikael Abrahamsson (Jan 19)
- Re: MTU to CDN's Vincent Bernat (Jan 18)
- Message not available
- Message not available
- Re: MTU to CDN's Michael Crapse (Jan 18)
- Re: MTU to CDN's Mikael Abrahamsson (Jan 18)
- Re: MTU to CDN's Mike Hammett (Jan 19)
- Re: MTU to CDN's Mikael Abrahamsson (Jan 19)