nat-adv-settings.dita@ 105289

Last change on this file since 105289 was 99797, checked in by vboxsync, 2 years ago
Docs: bugref:10302. Merging changes from the docs team. Almost exclusively conkeyref related stuff.
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1	<?xml version='1.0' encoding='UTF-8'?>
2	<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
3	<topic xml:lang="en-us" id="nat-adv-settings">
4	<title>Tuning TCP/IP Buffers for NAT</title>
5
6	<body>
7	<p>
8	The <ph conkeyref="vbox-conkeyref-phrases/product-name"/> NAT stack performance is often determined by
9	its interaction with the host's TCP/IP stack and the size of
10	several buffers, <codeph>SO_RCVBUF</codeph> and
11	<codeph>SO_SNDBUF</codeph>. For certain setups users might
12	want to adjust the buffer size for a better performance. This
13	can by achieved using the following commands, where values are
14	in kilobytes and can range from 8 to 1024:
15	</p>
16	<pre xml:space="preserve">$ VBoxManage modifyvm <varname>VM-name</varname> \
17	--natsettings1 16000,128,128,0,0</pre>
18	<p>
19	This example illustrates tuning the NAT settings. The first
20	parameter is the MTU, then the size of the socket's send buffer
21	and the size of the socket's receive buffer, the initial size of
22	the TCP send window, and lastly the initial size of the TCP
23	receive window. Note that specifying zero means fallback to the
24	default value.
25	</p>
26	<p>
27	Each of these buffers has a default size of 64KB and default MTU
28	is 1500.
29	</p>
30	</body>
31
32	</topic>

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