FreeBSD/EC2 - MTU on xn0?

[Colin Percival]

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