Re: Old thread: Re: Allowing large PPPoE frames

[Paul Ripke <stix%stix.id.au@localhost>]

On Mon, Apr 14, 2008 at 07:35:43AM +0200, Quentin Garnier wrote:
> On Mon, Apr 14, 2008 at 01:57:28PM +1000, Paul Ripke wrote:
> > Just wondering if anything happened to this old issue - I've just
> 
> Not so much an issue as an unexpected feature of my PPPoE setup at the
> time, which, sadly, came to an end shortly after when I changed my
> contract with the ISP and received a new modem that wouldn't let large
> frames through.
> 
> > tripped over the same thing with my ISP.
> 
> What do you mean by trip over?  You're in a situation where oversized
> frames actually go as far as ether_input?

Initially, only 802.1Q VLAN-compatible sized frames were getting
that far. Then I removed an ethernet switch out of the path, and
yes, 1522 byte frames were being received.

> In that case, it's a 10 minute job to revive that patch, it was very
> simple after all.

I took a slightly more brutal approach. I just removed the "return"
from the check and passed all oversize frames through. Hey, it works.
The NIC is a gigabit sk that supports jumbo frames, so that part
works. I didn't find your patch until after I got it working. For
me, it was breaking large udp and icmp packets, possibly ipsec, too.

It's an annoying position to be in.

Cheers,
-- 
Paul Ripke