Subject: Re: can't raise in kernel pppoe0 with mtu > 1460
To: None <tech-net@netbsd.org>
From: Miles Nordin <carton@Ivy.NET>
List: tech-net
Date: 03/22/2005 16:09:42
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>>>>> "cb" == Carl Brewer <carl@bl.echidna.id.au> writes:

    cb> Is there some reason why you're blocking the ICMP type 3 code
    cb> 4 packets?

If the problem is downloading a web page, it would be your ISP's
ADSLAM that sends an ICMP unreachable to the web server.  The ICMP
would never touch your end of the link.  The mssclamp hack is to deal
with webmasters behind firewalls that block all ICMP.  

Blocking all ICMP on your web browser end is wrong, and NAT and 'keep
state' should pass ICMP related to a TCP flow without any extra rules,
if the firewall is bug-free.  However although I grant you it'd be a
mistake to block those packets, I don't think that mistake could cause
the problem mssclamp fixes.

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