mtu question

Wed Nov 17 21:23:54 UTC 2010

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 at brightok.net
> To: deric.kwok2000 at gmail.com
> Subject: Re: mtu question
> CC: nanog at 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
> 