Date: Sun, 7 Jan 2001 19:38:03 +0000 From: Ben Smithurst <ben@FreeBSD.org> To: mwozniak@pobox.com Cc: doc@FreeBSD.org Subject: Re: update to "Chapter 10. PPP" of "Frequently Asked Questions for FreeBSD 2.X, 3.X and 4.X" Message-ID: <20010107193803.B85794@strontium.scientia.demon.co.uk> In-Reply-To: <002301c078d4$1f1a6fc0$0a80a8c0@mwozniak.uniservers.com> References: <002301c078d4$1f1a6fc0$0a80a8c0@mwozniak.uniservers.com>
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Michael Wozniak wrote: > I would like to add to the statement "the Telco router is not sending > ICMP ``must fragment'' back to the www site you are trying to load" > that sometimes the Telco _is_ sendind a "must fragment" back to the > www site but the firewall at the www site is dropping it (also a > misconfiguration.) > > Also, somebody reading this FAQ asked me about Win2K so I referred > them to Microsoft Knowledge Base article "Q120642 - TCP/IP & NBT > Configuration Parameters for Windows NT and Windows 2000" It indicated > that the registry key has changed to Tcpip\Parameters\Interfaces\<ID > for Adapter>\MTU > > Lastly, if you could change the reference "MS KB" to "Microsoft > Knowledge Base" with a link to http://search.support.microsoft.com/kb, I can't actually see anything at that URL, presumably Microsoft have designed it so it doesn't work in netscape. <sigh> I'll take your word for it that the URL is correct though... > that would help some people figure these things out on their own. Does this patch look ok to you? Or just go to <http://people.FreeBSD.org/~ben/faq/ppp.html#MACOS-WIN98-PPPOE-FREEZE>; and make sure the finished version looks alright before I commit it. Index: book.sgml =================================================================== RCS file: /usr/cvs/doc/en_US.ISO_8859-1/books/faq/book.sgml,v retrieving revision 1.135 diff -u -r1.135 book.sgml --- book.sgml 2001/01/05 20:44:26 1.135 +++ book.sgml 2001/01/07 19:30:34 @@ -9224,7 +9224,9 @@ <emphasis remap=bf>and</emphasis> have the <quote>don't fragment</quote> bit set (default of TCP) and the Telco router is not sending ICMP <quote>must fragment</quote> back to the - www site you are trying to load. When the www server is sending + www site you are trying to load. (Alternatively, the router is + sending the ICMP packet correctly, but the firewall at the www + site is dropping it.) When the www server is sending you frames that don't fit into the PPPoE pipe the Telco router drops them on the floor and your page doesn't load (some pages/graphics do as they are smaller than a MSS.) This seems @@ -9242,9 +9244,14 @@ (more accurately it should be <quote>1464</quote> to fit TCP packets into a PPPoE frame perfectly but the <quote>1450</quote> gives you a margin of error for other IP - protocols you may encounter).</para> + protocols you may encounter). This registry key is reported to + have moved to + <literal>Tcpip\Parameters\Interfaces\<replaceable>ID for adapter</replaceable>\MTU</literal> + in Windows 2000.</para> - <para>Refer to MS KB # <quote>Q158474 - Windows TCPIP Registry + <para>Refer to <ulink + URL="http://search.support.microsoft.com/kb">Microsoft Knowledge + Base</ulink> documents <quote>Q158474 - Windows TCPIP Registry Entries</quote> and <quote>Q120642 - TCPIP & NBT Configuration Parameters for Windows NT </quote> for more information on changing Windoze MTU to work with a FreeBSD/NAT/PPPoE -- Ben Smithurst / ben@FreeBSD.org / PGP: 0x99392F7D To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-doc" in the body of the message
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