nos-tun man page on FreeBSD

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NOS-TUN(8)		  BSD System Manager's Manual		    NOS-TUN(8)

     nos-tun — implement ``nos'' or ``ka9q'' style IP over IP tunnel

     nos-tun -t tunnel -s source -d destination -p protocol_number [source]

     The nos-tun utility is used to establish an nos style tunnel, (also known
     as ka9q or IP-IP tunnel) using a tun(4) kernel interface.

     Tunnel is the name of the tunnel device /dev/tun0 for example.

     Source and destination are the addresses used on the tunnel device.  If
     you configure the tunnel against a cisco router, use a netmask of
     “” on the cisco.  This is because the tunnel is a point-
     to-point interface in the FreeBSD end, a concept cisco does not really

     Protocol number sets tunnel mode.	Original KA9Q NOS uses 94 but many
     people use 4 on the worldwide backbone of

     Target is the address of the remote tunnel device, this must match the
     source address set on the remote end.

     This end, a FreeBSD box on address

	   nos-tun -t /dev/tun0 -s -d

     Remote cisco on address

	   interface tunnel 0
	   ip address
	   tunnel mode nos
	   tunnel destination
	   tunnel source

     Nickolay N. Dudorov ⟨⟩ wrote the program, Poul-Henning
     Kamp ⟨⟩ wrote the man-page.	 Isao SEKI ⟨⟩
     added a new flag, IP protocol number.

     We do not allow for setting our source address for multihomed machines.

BSD				April 11, 1998				   BSD

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