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629 lines
11 KiB
629 lines
11 KiB
3 years ago
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<HTML
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><HEAD
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><TITLE
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>Configuring and using a tuntap network interface</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
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REL="HOME"
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TITLE="Bochs User Manual"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Tips and Techniques"
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HREF="howto.html"><LINK
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REL="PREVIOUS"
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TITLE="Setting Up Networking in DLX Linux"
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HREF="dlxlinux-networking.html"><LINK
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REL="NEXT"
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TITLE="Using Bochs internal debugger"
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HREF="internal-debugger.html"></HEAD
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Bochs User Manual</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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><A
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HREF="dlxlinux-networking.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 8. Tips and Techniques</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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><A
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HREF="internal-debugger.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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CLASS="SECTION"
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><H1
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CLASS="SECTION"
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><A
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NAME="CONFIG-TUNTAP"
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>8.10. Configuring and using a tuntap network interface</A
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></H1
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><P
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>If you use linux (optionally FreeBSD and Solaris, not tested),
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you may want to access the network through a tuntap interface. The main
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advantage of this interface, is that the guest has access to the host. The guest can even
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have access to the whole network if the host routes or masquerades the guest requests.
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No extra IP address is needed, all can be done using private IP addresses.</P
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><P
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>You'll find here instructions to set up Linux/Bochs to provide network access to the guest OS
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through a tuntap interface and private IP network. We're going to see howto :
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<P
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></P
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><UL
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><LI
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><P
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>enable the tuntap interface in the Linux Kernel </P
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></LI
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><LI
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><P
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>configure Bochs to use the tuntap interface </P
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></LI
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><LI
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><P
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>set up the private network between the host and the guest </P
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></LI
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><LI
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><P
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>set up the host to masquerade the guest network accesses </P
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></LI
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></UL
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></P
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><DIV
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CLASS="SECTION"
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><H2
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CLASS="SECTION"
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><A
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NAME="AEN2925"
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>8.10.1. Tuntap description</A
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></H2
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><P
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>From the <A
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HREF="http://www.kernel.org/pub/linux/kernel/people/marcelo/linux-2.4/Documentation/networking/tuntap.txt"
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TARGET="_top"
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>tuntap.txt</A
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> file in the Linux kernel tree :
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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> TUN/TAP provides packet reception and transmission for user space programs.
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It can be viewed as a simple Point-to-Point or Ethernet device, which
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instead of receiving packets from a physical media, receives them from
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user space program and instead of sending packets via physical media
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writes them to the user space program.
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When a program opens /dev/net/tun, driver creates and registers corresponding
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net device tunX or tapX. After a program closed above devices, driver will
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automatically delete tunXX or tapXX device and all routes corresponding to it.</PRE
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></TD
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></TR
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></TABLE
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></P
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></DIV
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><DIV
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CLASS="SECTION"
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><H2
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CLASS="SECTION"
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><A
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NAME="AEN2930"
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>8.10.2. Set up the linux Kernel
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<A
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NAME="AEN2932"
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HREF="#FTN.AEN2932"
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><SPAN
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CLASS="footnote"
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>[1]</SPAN
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></A
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></A
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></H2
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><P
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>First make sure the tuntap module is included in the kernel :
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<P
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></P
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><UL
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><LI
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><P
|
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>if you use a recent distribution, chances are that the needed modules are already build</P
|
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><P
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>Make sure that "Kernel module loader" - module auto-loading support is enabled in your kernel.</P
|
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><P
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>Add following line to the /etc/modules.conf: <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="90%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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> alias char-major-10-200 tun </PRE
|
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></TD
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></TR
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></TABLE
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> </P
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><P
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>Run: <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="90%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
|
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> depmod -a</PRE
|
||
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></TD
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></TR
|
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></TABLE
|
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> The driver will be automatically loaded when application access /dev/net/tun.</P
|
||
|
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></LI
|
||
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><LI
|
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><P
|
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|
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>Otherwise, recompile the kernel, including the configuration option
|
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<TABLE
|
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BORDER="0"
|
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BGCOLOR="#E0E0E0"
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WIDTH="90%"
|
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><TR
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><TD
|
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><PRE
|
||
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CLASS="SCREEN"
|
||
|
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> CONFIG_TUN (Network device support -> Universal TUN/TAP device driver support) </PRE
|
||
|
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></TD
|
||
|
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></TR
|
||
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></TABLE
|
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>
|
||
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</P
|
||
|
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></LI
|
||
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></UL
|
||
|
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>
|
||
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<DIV
|
||
|
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CLASS="NOTE"
|
||
|
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><BLOCKQUOTE
|
||
|
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CLASS="NOTE"
|
||
|
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><P
|
||
|
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><B
|
||
|
|
>Note: </B
|
||
|
|
>Make sure there is a /dev/net/tun device.
|
||
|
|
(Can be created with '<B
|
||
|
|
CLASS="COMMAND"
|
||
|
|
>mkdir /dev/net ; mknod /dev/net/tun c 10 200'</B
|
||
|
|
>).</P
|
||
|
|
></BLOCKQUOTE
|
||
|
|
></DIV
|
||
|
|
></P
|
||
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><P
|
||
|
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>In the same way, to use masquerading, you need a kernel with the following options :
|
||
|
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<TABLE
|
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BORDER="0"
|
||
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BGCOLOR="#E0E0E0"
|
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|
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WIDTH="100%"
|
||
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><TR
|
||
|
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><TD
|
||
|
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><PRE
|
||
|
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CLASS="SCREEN"
|
||
|
|
> CONFIG_IP_NF_CONNTRACK (Connection tracking)
|
||
|
|
CONFIG_IP_NF_IPTABLES (IP tables support)
|
||
|
|
CONFIG_IP_NF_NAT (Full NAT)</PRE
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
>
|
||
|
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<DIV
|
||
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CLASS="NOTE"
|
||
|
|
><BLOCKQUOTE
|
||
|
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CLASS="NOTE"
|
||
|
|
><P
|
||
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><B
|
||
|
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>Note: </B
|
||
|
|
>Some of the other options in this group is probably also needed,
|
||
|
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(but the default setting should be OK).</P
|
||
|
|
></BLOCKQUOTE
|
||
|
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></DIV
|
||
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></P
|
||
|
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></DIV
|
||
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><DIV
|
||
|
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CLASS="SECTION"
|
||
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><H2
|
||
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CLASS="SECTION"
|
||
|
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><A
|
||
|
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NAME="AEN2954"
|
||
|
|
>8.10.3. Configure Bochs to use the tuntap interface</A
|
||
|
|
></H2
|
||
|
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><P
|
||
|
|
>Make sure Bochs has ne2000 support. If you have to recompile Bochs,
|
||
|
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<B
|
||
|
|
CLASS="COMMAND"
|
||
|
|
>--enable-ne2000</B
|
||
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> when running <B
|
||
|
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CLASS="COMMAND"
|
||
|
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>./configure</B
|
||
|
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>
|
||
|
|
(see <A
|
||
|
|
HREF="compiling.html"
|
||
|
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>Section 3.4</A
|
||
|
|
>)
|
||
|
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</P
|
||
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><P
|
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>edit your <TT
|
||
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CLASS="REPLACEABLE"
|
||
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><I
|
||
|
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>.bochsrc</I
|
||
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></TT
|
||
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> configuration file and add something like :
|
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
|
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><PRE
|
||
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CLASS="SCREEN"
|
||
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> ne2k: ioaddr=0x300, irq=9, mac=fe:fd:00:00:00:01,
|
||
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ethmod=tuntap, ethdev=/dev/net/tun0, script=<TT
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||
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CLASS="REPLACEABLE"
|
||
|
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><I
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>/path/to/tunconfig</I
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></TT
|
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>
|
||
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</PRE
|
||
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></TD
|
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></TR
|
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></TABLE
|
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>
|
||
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</P
|
||
|
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><P
|
||
|
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> Since the tuntap interface cannot be configured until a process opens it,
|
||
|
|
Bochs may run a script file for you. In this case
|
||
|
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<TT
|
||
|
|
CLASS="REPLACEABLE"
|
||
|
|
><I
|
||
|
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>/path/to/tunconfig</I
|
||
|
|
></TT
|
||
|
|
> should be changed to match
|
||
|
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the actual place where you'll create this script.
|
||
|
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</P
|
||
|
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></DIV
|
||
|
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><DIV
|
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|
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CLASS="SECTION"
|
||
|
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><H2
|
||
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CLASS="SECTION"
|
||
|
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><A
|
||
|
|
NAME="AEN2966"
|
||
|
|
>8.10.4. Set up the private network between the host and the guest</A
|
||
|
|
></H2
|
||
|
|
><P
|
||
|
|
> We'll set up a private network between the host and the guest with the following parameters:
|
||
|
|
<TABLE
|
||
|
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BORDER="0"
|
||
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BGCOLOR="#E0E0E0"
|
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WIDTH="100%"
|
||
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><TR
|
||
|
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><TD
|
||
|
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><PRE
|
||
|
|
CLASS="SCREEN"
|
||
|
|
> Host IP : 192.168.1.1
|
||
|
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Guest IP : 192.168.1.2
|
||
|
|
</PRE
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
>
|
||
|
|
If your parameters are different, adapt the rest of the section to suit your needs.
|
||
|
|
</P
|
||
|
|
><P
|
||
|
|
> Create the <TT
|
||
|
|
CLASS="REPLACEABLE"
|
||
|
|
><I
|
||
|
|
>/path/to/tunconfig</I
|
||
|
|
></TT
|
||
|
|
> script :
|
||
|
|
<TABLE
|
||
|
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BORDER="0"
|
||
|
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BGCOLOR="#E0E0E0"
|
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WIDTH="100%"
|
||
|
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><TR
|
||
|
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><TD
|
||
|
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><PRE
|
||
|
|
CLASS="SCREEN"
|
||
|
|
> #!/bin/bash
|
||
|
|
/sbin/ifconfig ${1##/*/} 192.168.1.1
|
||
|
|
</PRE
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
>
|
||
|
|
The script get the interface name as the first parameter. Linux
|
||
|
|
will forward incoming packets between interfaces.
|
||
|
|
</P
|
||
|
|
><P
|
||
|
|
> Make it executable :<TABLE
|
||
|
|
BORDER="0"
|
||
|
|
BGCOLOR="#E0E0E0"
|
||
|
|
WIDTH="100%"
|
||
|
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><TR
|
||
|
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><TD
|
||
|
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><PRE
|
||
|
|
CLASS="SCREEN"
|
||
|
|
>chmod 755 <TT
|
||
|
|
CLASS="REPLACEABLE"
|
||
|
|
><I
|
||
|
|
>/path/to/tunconfig</I
|
||
|
|
></TT
|
||
|
|
></PRE
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
>
|
||
|
|
</P
|
||
|
|
><P
|
||
|
|
> Run Bochs, install the guest OS, and set the following network parameters in the guest OS:
|
||
|
|
<TABLE
|
||
|
|
BORDER="0"
|
||
|
|
BGCOLOR="#E0E0E0"
|
||
|
|
WIDTH="100%"
|
||
|
|
><TR
|
||
|
|
><TD
|
||
|
|
><PRE
|
||
|
|
CLASS="SCREEN"
|
||
|
|
> IP: 192.168.1.2
|
||
|
|
netmask: 255.255.255.0
|
||
|
|
gateway: 192.168.1.1
|
||
|
|
nameserver: whatever is used in linux
|
||
|
|
</PRE
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
>
|
||
|
|
<DIV
|
||
|
|
CLASS="NOTE"
|
||
|
|
><BLOCKQUOTE
|
||
|
|
CLASS="NOTE"
|
||
|
|
><P
|
||
|
|
><B
|
||
|
|
>Note: </B
|
||
|
|
> Bochs must be started by root (at least for now - the
|
||
|
|
script won't have root privileges otherwise).
|
||
|
|
</P
|
||
|
|
></BLOCKQUOTE
|
||
|
|
></DIV
|
||
|
|
>
|
||
|
|
You may also have to edit /etc/hosts.allow in the host OS and add :
|
||
|
|
<TABLE
|
||
|
|
BORDER="0"
|
||
|
|
BGCOLOR="#E0E0E0"
|
||
|
|
WIDTH="100%"
|
||
|
|
><TR
|
||
|
|
><TD
|
||
|
|
><PRE
|
||
|
|
CLASS="SCREEN"
|
||
|
|
> ALL: 192.168.1.2
|
||
|
|
</PRE
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
>
|
||
|
|
Don't forget to set up the route on the guest.
|
||
|
|
</P
|
||
|
|
><P
|
||
|
|
> At this point, you should be able to ping/telnet/ftp/ssh the guest from the host
|
||
|
|
and vice-versa.
|
||
|
|
</P
|
||
|
|
></DIV
|
||
|
|
><DIV
|
||
|
|
CLASS="SECTION"
|
||
|
|
><H2
|
||
|
|
CLASS="SECTION"
|
||
|
|
><A
|
||
|
|
NAME="AEN2982"
|
||
|
|
>8.10.5. Set up the host to masquerade the guest network accesses</A
|
||
|
|
></H2
|
||
|
|
><P
|
||
|
|
> We are going to set up standard masquerading configuration. Edit
|
||
|
|
the <TT
|
||
|
|
CLASS="REPLACEABLE"
|
||
|
|
><I
|
||
|
|
>/path/to/tunconfig</I
|
||
|
|
></TT
|
||
|
|
> script ans add :
|
||
|
|
<TABLE
|
||
|
|
BORDER="0"
|
||
|
|
BGCOLOR="#E0E0E0"
|
||
|
|
WIDTH="100%"
|
||
|
|
><TR
|
||
|
|
><TD
|
||
|
|
><PRE
|
||
|
|
CLASS="SCREEN"
|
||
|
|
> /sbin/iptables -D POSTROUTING -t nat -s 192.168.1.0/24 -d ! 192.168.1.0/24 -j MASQUERADE >& /dev/null
|
||
|
|
/sbin/iptables -t nat -s 192.168.1.0/24 -d ! 192.168.1.0/24 -A POSTROUTING -j MASQUERADE
|
||
|
|
echo 1 > /proc/sys/net/ipv4/ip_forward
|
||
|
|
</PRE
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
>
|
||
|
|
<DIV
|
||
|
|
CLASS="NOTE"
|
||
|
|
><BLOCKQUOTE
|
||
|
|
CLASS="NOTE"
|
||
|
|
><P
|
||
|
|
><B
|
||
|
|
>Note: </B
|
||
|
|
> The configuration assumes the default policy is
|
||
|
|
ACCEPT (can be examined by doing '<B
|
||
|
|
CLASS="COMMAND"
|
||
|
|
>/sbin/iptables -L</B
|
||
|
|
>')
|
||
|
|
</P
|
||
|
|
></BLOCKQUOTE
|
||
|
|
></DIV
|
||
|
|
>
|
||
|
|
<DIV
|
||
|
|
CLASS="NOTE"
|
||
|
|
><BLOCKQUOTE
|
||
|
|
CLASS="NOTE"
|
||
|
|
><P
|
||
|
|
><B
|
||
|
|
>Note: </B
|
||
|
|
> The iptables package must be installed. </P
|
||
|
|
></BLOCKQUOTE
|
||
|
|
></DIV
|
||
|
|
>
|
||
|
|
And voila... The host should forward the packets of the guest to the rest of your network.
|
||
|
|
You could even have acces to the internet...
|
||
|
|
<IMG
|
||
|
|
SRC="../images/undercon.png"> add nice screenshot
|
||
|
|
<DIV
|
||
|
|
CLASS="NOTE"
|
||
|
|
><BLOCKQUOTE
|
||
|
|
CLASS="NOTE"
|
||
|
|
><P
|
||
|
|
><B
|
||
|
|
>Note: </B
|
||
|
|
> You may need to load other modules if you want to use other fancy protocols (ftp,etc...)
|
||
|
|
</P
|
||
|
|
></BLOCKQUOTE
|
||
|
|
></DIV
|
||
|
|
>
|
||
|
|
</P
|
||
|
|
></DIV
|
||
|
|
></DIV
|
||
|
|
><H3
|
||
|
|
CLASS="FOOTNOTES"
|
||
|
|
>Notes</H3
|
||
|
|
><TABLE
|
||
|
|
BORDER="0"
|
||
|
|
CLASS="FOOTNOTES"
|
||
|
|
WIDTH="100%"
|
||
|
|
><TR
|
||
|
|
><TD
|
||
|
|
ALIGN="LEFT"
|
||
|
|
VALIGN="TOP"
|
||
|
|
WIDTH="5%"
|
||
|
|
><A
|
||
|
|
NAME="FTN.AEN2932"
|
||
|
|
HREF="config-tuntap.html#AEN2932"
|
||
|
|
><SPAN
|
||
|
|
CLASS="footnote"
|
||
|
|
>[1]</SPAN
|
||
|
|
></A
|
||
|
|
></TD
|
||
|
|
><TD
|
||
|
|
ALIGN="LEFT"
|
||
|
|
VALIGN="TOP"
|
||
|
|
WIDTH="95%"
|
||
|
|
><P
|
||
|
|
>much of the information of the following section is taken from
|
||
|
|
<A
|
||
|
|
HREF="http://maconlinux.org/lists/mol-general/August01/0056.html"
|
||
|
|
TARGET="_top"
|
||
|
|
> this email from Samuel Rydh of the Mac-On-Linux list</A
|
||
|
|
></P
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
><DIV
|
||
|
|
CLASS="NAVFOOTER"
|
||
|
|
><HR
|
||
|
|
ALIGN="LEFT"
|
||
|
|
WIDTH="100%"><TABLE
|
||
|
|
SUMMARY="Footer navigation table"
|
||
|
|
WIDTH="100%"
|
||
|
|
BORDER="0"
|
||
|
|
CELLPADDING="0"
|
||
|
|
CELLSPACING="0"
|
||
|
|
><TR
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="left"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="dlxlinux-networking.html"
|
||
|
|
ACCESSKEY="P"
|
||
|
|
>Prev</A
|
||
|
|
></TD
|
||
|
|
><TD
|
||
|
|
WIDTH="34%"
|
||
|
|
ALIGN="center"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="index.html"
|
||
|
|
ACCESSKEY="H"
|
||
|
|
>Home</A
|
||
|
|
></TD
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="right"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="internal-debugger.html"
|
||
|
|
ACCESSKEY="N"
|
||
|
|
>Next</A
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
><TR
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="left"
|
||
|
|
VALIGN="top"
|
||
|
|
>Setting Up Networking in DLX Linux</TD
|
||
|
|
><TD
|
||
|
|
WIDTH="34%"
|
||
|
|
ALIGN="center"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="howto.html"
|
||
|
|
ACCESSKEY="U"
|
||
|
|
>Up</A
|
||
|
|
></TD
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="right"
|
||
|
|
VALIGN="top"
|
||
|
|
>Using Bochs internal debugger</TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
></DIV
|
||
|
|
></BODY
|
||
|
|
></HTML
|
||
|
|
>
|