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Explain how to get around the "black hole router" problem for MacOS clients.

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Submitted by:	Dan Flemming <danflemming@mac.com>, jedgar
This commit is contained in:
Ben Smithurst 2000-07-16 18:06:44 +00:00
parent 3869f10762
commit c3d856b07e
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=7640
2 changed files with 36 additions and 10 deletions
en_US.ISO8859-1/books/faq
book.sgml
en_US.ISO_8859-1/books/faq
book.sgml

23
en_US.ISO8859-1/books/faq/book.sgml
View file

@ -13,7 +13,7 @@
</author>
</authorgroup>
<pubdate>$FreeBSD: doc/en_US.ISO_8859-1/books/faq/book.sgml,v 1.69 2000/07/11 15:42:14 ben Exp $</pubdate>
<pubdate>$FreeBSD: doc/en_US.ISO_8859-1/books/faq/book.sgml,v 1.70 2000/07/11 21:36:22 ben Exp $</pubdate>
<abstract>
<para>This is the FAQ for FreeBSD versions 2.X, 3.X, and 4.X. All entries
@ -7757,19 +7757,20 @@ have been terminated, you should ask the remote administrator
<qandaentry id=PPPoEwithNAT>
<question>
<para>Why do my Windows 98 connections freeze when I run PPPoE on the gateway</para>
<para>Why do MacOS and Windows 98 connections freeze when running PPPoE on the gateway</para>
</question>
<answer>
<para>
Thanks to Michael Wozniak <email>mwozniak@netcom.ca</email> for figuring
this out:
this out and Dan Flemming <email>danflemming@mac.com</email> for the Mac
solution:
</para>
<para>
This is due to what's called a "Black Hole" router. Windows 98 (and
maybe other Microsoft OSs) is sending TCP packets with a requested
This is due to what's called a "Black Hole" router. MacOS and Windows 98 (and
maybe other Microsoft OSs) send TCP packets with a requested
segment size too big to fit into a PPPoE frame (MTU is 1500 by default
for ethernet) <emphasis remap=bf>and</emphasis> have the "don't fragment"
bit set (default of TCP) and the Telco router is not sending ICMP "must
@ -7804,6 +7805,18 @@ have been terminated, you should ask the remote administrator
FreeBSD/NAT/PPPoE router.
</para>
<para>
Unfortunately, MacOS does not provide an interface for changing TCP/IP
settings. However, there is commercial software available, such as
OTAdvancedTuner (OT for OpenTransport, the MacOS TCP/IP stack) by
<ulink URL="http://www.softworks.com/">Sustainable Softworks</ulink>,
that will allow users to customize TCP/IP settings. MacOS NAT users
should select <literal>ip_interface_MTU</literal> from the drop-down
menu, enter <literal>1450</literal> instead of <literal>1500</literal>
in the box, click the box next to <literal>Save as Auto
Configure</literal>, and click <literal>Make Active</literal>.
</para>
</answer>
</qandaentry>

23
en_US.ISO_8859-1/books/faq/book.sgml
View file

@ -13,7 +13,7 @@
</author>
</authorgroup>
<pubdate>$FreeBSD: doc/en_US.ISO_8859-1/books/faq/book.sgml,v 1.69 2000/07/11 15:42:14 ben Exp $</pubdate>
<pubdate>$FreeBSD: doc/en_US.ISO_8859-1/books/faq/book.sgml,v 1.70 2000/07/11 21:36:22 ben Exp $</pubdate>
<abstract>
<para>This is the FAQ for FreeBSD versions 2.X, 3.X, and 4.X. All entries
@ -7757,19 +7757,20 @@ have been terminated, you should ask the remote administrator
<qandaentry id=PPPoEwithNAT>
<question>
<para>Why do my Windows 98 connections freeze when I run PPPoE on the gateway</para>
<para>Why do MacOS and Windows 98 connections freeze when running PPPoE on the gateway</para>
</question>
<answer>
<para>
Thanks to Michael Wozniak <email>mwozniak@netcom.ca</email> for figuring
this out:
this out and Dan Flemming <email>danflemming@mac.com</email> for the Mac
solution:
</para>
<para>
This is due to what's called a "Black Hole" router. Windows 98 (and
maybe other Microsoft OSs) is sending TCP packets with a requested
This is due to what's called a "Black Hole" router. MacOS and Windows 98 (and
maybe other Microsoft OSs) send TCP packets with a requested
segment size too big to fit into a PPPoE frame (MTU is 1500 by default
for ethernet) <emphasis remap=bf>and</emphasis> have the "don't fragment"
bit set (default of TCP) and the Telco router is not sending ICMP "must
@ -7804,6 +7805,18 @@ have been terminated, you should ask the remote administrator
FreeBSD/NAT/PPPoE router.
</para>
<para>
Unfortunately, MacOS does not provide an interface for changing TCP/IP
settings. However, there is commercial software available, such as
OTAdvancedTuner (OT for OpenTransport, the MacOS TCP/IP stack) by
<ulink URL="http://www.softworks.com/">Sustainable Softworks</ulink>,
that will allow users to customize TCP/IP settings. MacOS NAT users
should select <literal>ip_interface_MTU</literal> from the drop-down
menu, enter <literal>1450</literal> instead of <literal>1500</literal>
in the box, click the box next to <literal>Save as Auto
Configure</literal>, and click <literal>Make Active</literal>.
</para>
</answer>
</qandaentry>