Messages in this thread Patch in this message | | | Date | Wed, 18 Nov 2009 12:30:42 +1100 | Subject | [PATCH] Documentation, clarify tuntap IPX example. | From | andrew hendry <> |
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Can the TUNSETIFF ioctl change a tap's protocol to IPX as the documentation suggests? I think tun.c would need IFF_IPX_TAP added for it to work as described? Otherwise tap can only be ptp or ethernet, and there is no way to route or use AF_IPX.
Signed-off-by: Andrew Hendry <andrew.hendry@gmail.com>
--- a/Documentation/networking/tuntap.txt 2009-11-11 14:03:22.676167648 +1100 +++ b/Documentation/networking/tuntap.txt 2009-11-18 11:34:18.106647029 +1100 @@ -127,12 +127,14 @@ Ethernet device, which instead of receiv media, receives them from user space program and instead of sending packets via physical media sends them to the user space program.
-Let's say that you configured IPX on the tap0, then whenever -the kernel sends an IPX packet to tap0, it is passed to the application -(VTun for example). The application encrypts, compresses and sends it to -the other side over TCP or UDP. The application on the other side decompresses -and decrypts the data received and writes the packet to the TAP device, -the kernel handles the packet like it came from real physical device. +Let's say for the purpose of example, IPX support was added to tuntap. +Then whenever the kernel routes an IPX packet to tap0, it is passed to the +application reading the file descriptor from /dev/net/tun (VTun for example). +The application encrypts, compresses and sends it to the other side over TCP +or UDP. The application on the other side decompresses and decrypts the data +received and writes the packet to the TAP device, the remote kernel handles +the packet like it came from real physical device. The IPX applications are +able to communicate as if there was a real IPX network.
4. What is the difference between TUN driver and TAP driver? TUN works with IP frames. TAP works with Ethernet frames.
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