| gre.4 (107726) | gre.4 (125024) |
|---|---|
| 1.\" $NetBSD: gre.4,v 1.28 2002/06/10 02:49:35 itojun Exp $ 2.\" 3.\" Copyright 1998 (c) The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Heiko W.Rupp <hwr@pilhuhn.de> 8.\" --- 20 unchanged lines hidden (view full) --- 29.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35.\" POSSIBILITY OF SUCH DAMAGE. 36.\" | 1.\" $NetBSD: gre.4,v 1.28 2002/06/10 02:49:35 itojun Exp $ 2.\" 3.\" Copyright 1998 (c) The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Heiko W.Rupp <hwr@pilhuhn.de> 8.\" --- 20 unchanged lines hidden (view full) --- 29.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35.\" POSSIBILITY OF SUCH DAMAGE. 36.\" |
| 37.\" $FreeBSD: head/share/man/man4/gre.4 107726 2002-12-10 14:20:02Z ru $ | 37.\" $FreeBSD: head/share/man/man4/gre.4 125024 2004-01-26 12:33:56Z sobomax $ |
| 38.\" 39.Dd June 9, 2002 40.Dt GRE 4 41.Os 42.Sh NAME 43.Nm gre 44.Nd encapsulating network device 45.Sh SYNOPSIS --- 24 unchanged lines hidden (view full) --- 70prepended an outer datagram and a GRE header. 71The GRE header specifies 72the type of the encapsulated datagram and thus allows for tunneling other 73protocols than IP like e.g. AppleTalk. 74GRE mode is also the default tunnel mode on Cisco routers. 75This is also the default mode of operation of the 76.Nm 77interfaces. | 38.\" 39.Dd June 9, 2002 40.Dt GRE 4 41.Os 42.Sh NAME 43.Nm gre 44.Nd encapsulating network device 45.Sh SYNOPSIS --- 24 unchanged lines hidden (view full) --- 70prepended an outer datagram and a GRE header. 71The GRE header specifies 72the type of the encapsulated datagram and thus allows for tunneling other 73protocols than IP like e.g. AppleTalk. 74GRE mode is also the default tunnel mode on Cisco routers. 75This is also the default mode of operation of the 76.Nm 77interfaces. |
| 78As part of the GRE mode 79.Nm 80also supports Cisco WCCP protocol, both version 1 and version 2. 81Since there is no reliable way to distinguish between WCCP versions, it 82should be configured manually using the 83.Cm link2 84flag. 85If the 86.Cm link2 87flag is not set (default), then WCCP version 1 is selected. |
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| 78.It "MOBILE encapsulation (IP protocol number 55)" 79Datagrams are 80encapsulated into IP, but with a shorter encapsulation. 81The original 82IP header is modified and the modifications are inserted between the 83so modified header and the original payload. 84Like 85.Xr gif 4 , --- 226 unchanged lines hidden --- | 88.It "MOBILE encapsulation (IP protocol number 55)" 89Datagrams are 90encapsulated into IP, but with a shorter encapsulation. 91The original 92IP header is modified and the modifications are inserted between the 93so modified header and the original payload. 94Like 95.Xr gif 4 , --- 226 unchanged lines hidden --- |