MTU was: Re: [icecast] my icecast problem

Sean /The RIMBoy/ sean at
Wed Feb 28 19:17:18 UTC 2001

It is going to depend on a number of factors.  Linux sets (along with a
few other OS's I'm sure) its MTU to 1500.  The problem is, if you set it
longer then it will most likely be frag'd by your router.  If that router
does not, then another will.

I think MTU for ppp interfaces are smaller.

Likewise, if your backbone is FDDI, it has a large frame (somewhere in the
8000 range I believe is the default).  

I'd give you some accurate numbers but the book is at home and I'm at
work. :(

To better answer your questions, it just depends.  

On Wed, 28 Feb 2001, Kelly Lee Myers wrote:

> And just what exactly is an optimized sized packet?  I need numbers in
> bytes.
> I want control over it for a very specific reason.
> ----- Original Message -----
> From: "Sean /The RIMBoy/" <sean at>
> Sent: Wednesday, February 28, 2001 8:31 AM
> Subject: Re: [icecast] my icecast problem
> > On Wed, 28 Feb 2001, Kelly Lee Myers wrote:
> >
> > > In addition is there a way to set the size of the outgoing packets or is
> > > that completely handled by the stack and not icecast itself. Forgive me
> if
> > > that sounds stupid, but I didn't really get that deep into icecast
> > > configuration.
> >
> > You can... but...
> >
> > Someone correct me if I'm wrong, but you want to look at the MTU for your
> > interface.
> >
> > However, you'll probably see little if any difference and you may effect
> > performance for not only you, but your router(s) and that in turn would
> > effect your listeners.  Unless you have control over the routers and know
> > what type of topology the upstream connect runs (FDDI, ATM, etc) then
> > there is really no point in playing with the packet size.  Most OS's by
> > default are already using optimized packet sizes.

A flute with no holes is not a flute.  A donut with no hole is a danish.
	--Chevy Chase, Caddyshack
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--- >8 ----
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