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Re: [PATCH] fix tcp_default_win_scale.

To: "David S. Miller" <davem@xxxxxxxxxx>
Subject: Re: [PATCH] fix tcp_default_win_scale.
From: David Ford <david+challenge-response@xxxxxxxxxxxxx>
Date: Tue, 06 Jul 2004 16:26:15 -0400
Cc: Nivedita Singhvi <niv@xxxxxxxxxx>, shemminger@xxxxxxxx, ahu@xxxxxxx, acme@xxxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx, alessandro.suardi@xxxxxxxxxx, phyprabab@xxxxxxxxx, linux-net@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20040706131617.39484eff.davem@redhat.com>
References: <32886.63.170.215.71.1088564087.squirrel@www.osdl.org> <20040629222751.392f0a82.davem@redhat.com> <20040630152750.2d01ca51@dell_ss3.pdx.osdl.net> <20040630153049.3ca25b76.davem@redhat.com> <20040701133738.301b9e46@dell_ss3.pdx.osdl.net> <20040701140406.62dfbc2a.davem@redhat.com> <20040702013225.GA24707@conectiva.com.br> <20040706093503.GA8147@outpost.ds9a.nl> <20040706114741.1bf98bbe@dell_ss3.pdx.osdl.net> <40EB04C7.4000007@us.ibm.com> <20040706131617.39484eff.davem@redhat.com>
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It's been a while since I used a 1460 MTU for PPTP over DSL, but unless OSDN got a clue recently, their firewalls drop the ICMP for PMTU discovery. Does anyone have a tool that exercises a bunch of TCP/IP options to detect such broken firewalls?

David

David S. Miller wrote:

[...]
Frankly, I've personally seen none of this.  I sit on a DSL line with
no firewalling at my end and I can access all sites just fine.  This
seems to indicate that most of the breakage is local to the user's
point of access to the net, rather than a firewall at google.com
or kernel.org or similar.

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