06-01-2016
Just wanted to understand this, is it safe to say that the second subnet starts after the broadcast address:
192.168.0.0 /22
255.255.252.0
192.168.0.0 – 192.168.(3).255(Broadcast address)
192.168.(4).0 – 192.168.(7).255(Broadcast address), then next subnet
192.168.(8).0 – 192.168.(11).255(Broadcast address), then next subnet
192.168.(12).0 – 192.168.(15).255(Broadcast address)
And so on...
Similarly for the below IP:
IP Address – 172.59.0.0
Custom Subnet Mask – 255.255.252.0
Broadcast Address – 172.59.3.255
172.59.0.0 - 172.59.3.255
172.59.4.0 - 172.59.7.255
172.59.8.0 - 172.59.11.255
172.59.12.0 - 172.59.15.255
And so on....
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LEARN ABOUT FREEBSD
nos-tun
NOS-TUN(8) BSD 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
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.
BSD
April 11, 1998 BSD