Subject: Re: PPPoE + fragmentation + bad hdr length
To: None <tech-net@NetBSD.org>
From: Matthias Scheler <tron@zhadum.de>
List: tech-net
Date: 11/07/2004 08:08:10
In article <50581.66.96.29.230.1096924779.squirrel@www.capybara.org>,
	"Dan Fraser" <dfraser@capybara.org> writes:
> I'm using netbsd 1.6 PPPoE.  I see these problems on the local machine.
> 
> PPPoE seems to set the interface MTU appropriately:
> 
> pppoe0: flags=8851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST> mtu 1464
>         inet 66.96.18.31 -> 69.90.48.1 netmask 0xff000000
>         inet6 fe80::280:c8ff:fef8:f2d3%pppoe0 -> :: prefixlen 64 scopeid 0xa

Good. Your system is running a kernel with my PPPoE MTU negotiation code.
What value to you for MSS clamping in "/etc/ipnat.conf"? According to my
experiences it should be MTU - 52 which in your case would be 1412.

	Kind regards

-- 
Matthias Scheler                                  http://scheler.de/~matthias/