It is true - you I have had to throttle back for years for optimum transport on many carriers. In fact, if you have an ATT transit in your mix of BGP you wont get a ping response at 1500 MTU from that ATT router.
On Sun, 28 Jun 2015 08:02:52 -0700, Owen DeLong said: >> >> > On Jun 27, 2015, at 11:48 , manning <bmann...@karoshi.com> wrote: >> > >> > Quite a few folks actually. (the 802.5 & 802.4 specs) . >> > This is kind of like asking when we will stop using ethernet framing >> (ethernet was designed for a 3Mbps transmission rate) >> > yet we are deploying 100Gbps networks. Still stuck on that 1500byte >> limitation. When can we get rid of that? >> >> Many networks have Its called Jumbo Frames > > Unfortunately, enough people do things to break PMTU Discovery that it's > not > usually feasible to send jumbograms outside your directly controlled > networks. > So you may actually have jumbogram support all the way one end to the > other, > but you can't rely on it and have to throttle back to 1500 (or even > smaller) > in self-defense.... >
