2 .\" ----------------------------------------------------------------------------
3 .\" "THE BEER-WARE LICENSE" (Revision 42):
4 .\" <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
5 .\" can do whatever you want with this stuff. If we meet some day, and you think
6 .\" this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
7 .\" ----------------------------------------------------------------------------
9 .\" $FreeBSD: src/sbin/nos-tun/nos-tun.8,v 1.6.2.6 2003/02/23 20:53:46 trhodes Exp $
16 .Nd implement ``nos'' or ``ka9q'' style IP over IP tunnel
31 utility is used to establish an
33 style tunnel, (also known as
42 is the name of the tunnel device
49 are the addresses used on the tunnel device.
50 If you configure the tunnel against a cisco router, use a netmask of
52 on the cisco. This is because the tunnel is a point-to-point interface
55 end, a concept cisco doesn't really implement.
59 Original KA9Q NOS uses 94 but many people use 4
60 in worldwide backbone of ampr.org.
63 is the address of the remote tunnel device, this must match the source
64 address set on the remote end.
68 box on address 192.168.59.34:
69 .Bd -literal -offset indent
70 nos-tun -t /dev/tun0 -s 192.168.61.1 -d 192.168.61.2 192.168.56.45
73 Remote cisco on address 192.168.56.45:
74 .Bd -literal -offset indent
76 ip address 192.168.61.2 255.255.255.252
78 tunnel destination 192.168.59.34
79 tunnel source 192.168.56.45
83 .An Nickolay N. Dudorov Aq Mt nnd@itfs.nsk.su
85 .An Poul-Henning Kamp Aq Mt phk@FreeBSD.org
87 .An Isao SEKI Aq Mt iseki@gongon.com
88 added a new flag, IP protocol number.
90 We don't allow for setting our source address for multihomed machines.