Jack brings up a good point. MTU is basically pointless since packets never traverse any real interface....... So in theory the size can be anything...
Date: Wed, 17 Nov 2010 15:02:22 -0600 From: jbates@brightok.net To: deric.kwok2000@gmail.com Subject: Re: mtu question CC: nanog@nanog.org
On 11/17/2010 11:08 AM, Deric Kwok wrote:
Hi
I just see that the mtu in lo is different from standard eth 1500
Any meaning of it?
You transfer huge amounts of data on loopbacks similar to sockets. Supporting large MTU's is appropriate, and given the virtual nature of loopbacks, is probably generally designed to handle the buffers that transfer the data.
How about cisco / juniper loopback?
Thank you so much
Juniper M120: Type: Loopback, MTU: Unlimited
Cisco 7206 12.2SRE: MTU 1514 bytes, BW 8000000 Kbit/sec, DLY 5000 usec,
Jack