FreeBSD Manual Pages
NOS-TUN(8) 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 14.3 October 5, 2016 NOS-TUN(8)
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | HISTORY | AUTHORS | BUGS
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