|NOS-TUN(8)||FreeBSD System Manager's Manual||NOS-TUN(8)|
NAMEnos-tun — implement ``nos'' or ``ka9q'' style IP over IP tunnel
|nos-tun||-t tunnel -s source -d destination -p protocol_number [ source] target|
DESCRIPTIONThe 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.
EXAMPLESThis 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
AUTHORS<firstname.lastname@example.org> wrote the program, <phk@FreeBSD.org> wrote the man-page. <email@example.com> added a new flag, IP protocol number.
BUGSWe do not allow for setting our source address for multihomed machines.
|April 11, 1998||FreeBSD|