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download PDF document: nos-tun.8.pdf

NOS-TUN(8) FreeBSD System Manager's Manual NOS-TUN(8)
NAME nos-tun - implement ``nos'' or ``ka9q'' style IP over IP tunnel
SYNOPSIS nos-tun -t tunnel -s source -d destination -p protocol_number [source] target
DESCRIPTION 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 "255.255.255.252" on the cisco. This is because the tunnel is a point- to-point interface in the FreeBSD end, a concept cisco does not really implement.
Protocol number sets tunnel mode. Original KA9Q NOS uses 94 but many people use 4 on the worldwide backbone of ampr.org.
Target is the address of the remote tunnel device, this must match the source address set on the remote end.
EXAMPLES This end, a FreeBSD box on address 192.168.59.34:
nos-tun -t /dev/tun0 -s 192.168.61.1 -d 192.168.61.2 192.168.56.45
Remote cisco on address 192.168.56.45:
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
HISTORY The nos-tun utility appeared in FreeBSD 3.0.
AUTHORS Nickolay N. Dudorov <nnd@itfs.nsk.su> wrote the program, Poul-Henning Kamp <phk@FreeBSD.org> wrote the man-page. Isao SEKI <iseki@gongon.com> added a new flag, IP protocol number.
BUGS We do not allow for setting our source address for multihomed machines.
FreeBSD 14.0-RELEASE-p6 October 5, 2016 FreeBSD 14.0-RELEASE-p6