Date: Thu, 12 Mar 2015 13:57:09 -0700 From: Colin Percival <cperciva@freebsd.org> To: "Bradley T. Hughes" <bradleythughes@fastmail.fm>, freebsd-cloud@freebsd.org Subject: Re: FreeBSD/EC2 - MTU on xn0? Message-ID: <5501FDA5.9050903@freebsd.org> In-Reply-To: <708D692E-ED5D-421F-94C3-1984B95E0296@fastmail.fm> References: <708D692E-ED5D-421F-94C3-1984B95E0296@fastmail.fm>
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On 03/12/15 13:29, Bradley T. Hughes wrote: > The AWS EC2 Instance Types documentation[1] says that the MTU for the network interfaces is dependent on the instance type. A post on the AWS forums[2] by an AWS representative states that the MTU configuration is available via DHCP. Huh, I did not know EC2 supported jumbo frames. > I noticed that all of our T2 instances running FreeBSD have an MTU of 1500. After searching around a bit, I found this patch[3]. I get the same results when running the reproduction steps in EC2, despite ifconfig(8) saying it's using an MTU of 9001. > > I'm wondering if the patch in 187094 is what's needed to make the xn0 interface on our FreeBSD instances use jumbo frames? I have absolutely no clue. This might be a question for -xen or -net since it's not specific to EC2 (and there are more people on those lists). -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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