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Makefile
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Makefile.depend
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nos-tun.8
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nos-tun.c
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Editing: nos-tun.8
.\" .\" ---------------------------------------------------------------------------- .\" "THE BEER-WARE LICENSE" (Revision 42): .\" <phk@FreeBSD.org> wrote this file. As long as you retain this notice you .\" can do whatever you want with this stuff. If we meet some day, and you think .\" this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp .\" ---------------------------------------------------------------------------- .\" .\" $FreeBSD$ .\" .Dd October 5, 2016 .Dt NOS-TUN 8 .Os .Sh NAME .Nm nos-tun .Nd implement ``nos'' or ``ka9q'' style IP over IP tunnel .Sh SYNOPSIS .Nm .Fl t .Ar tunnel .Fl s .Ar source .Fl d .Ar destination .Fl p .Ar protocol_number .Op Ar source .Ar target .Sh DESCRIPTION The .Nm utility is used to establish an .Em nos style tunnel, (also known as .Em ka9q or .Em IP-IP tunnel) using a .Xr tun 4 kernel interface. .Pp .Ar Tunnel is the name of the tunnel device .Pa /dev/tun0 for example. .Pp .Ar Source and .Ar destination are the addresses used on the tunnel device. If you configure the tunnel against a cisco router, use a netmask of .Dq 255.255.255.252 on the cisco. This is because the tunnel is a point-to-point interface in the .Fx end, a concept cisco does not really implement. .Pp .Ar Protocol number sets tunnel mode. Original KA9Q NOS uses 94 but many people use 4 on the worldwide backbone of ampr.org. .Pp .Ar Target is the address of the remote tunnel device, this must match the source address set on the remote end. .Sh EXAMPLES This end, a .Fx box on address 192.168.59.34: .Bd -literal -offset indent nos-tun -t /dev/tun0 -s 192.168.61.1 -d 192.168.61.2 192.168.56.45 .Ed .Pp Remote cisco on address 192.168.56.45: .Bd -literal -offset indent interface tunnel 0 ip address 192.168.61.2 255.255.255.252 tunnel mode nos tunnel destination 192.168.59.34 tunnel source 192.168.56.45 .Ed .Sh HISTORY The .Nm utility appeared in .Fx 3.0 . .Sh AUTHORS .An -nosplit .An Nickolay N. Dudorov Aq Mt nnd@itfs.nsk.su wrote the program, .An Poul-Henning Kamp Aq Mt phk@FreeBSD.org wrote the man-page. .An Isao SEKI Aq Mt iseki@gongon.com added a new flag, IP protocol number. .Sh BUGS We do not allow for setting our source address for multihomed machines.
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