FreeBSD/EC2 - MTU on xn0?

[Bradley T. Hughes]

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.

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?

Thanks in advance :)

[1] http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html
[2] https://forums.aws.amazon.com/thread.jspa?threadID=143674
[3] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187094

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Bradley T. Hughes
bradleythughes at fastmail.fm