Forget the "octet" (or byte) concept for a moment. Look at it as 32 binary digits, all 1s and 0s.
That last one illustrates the subnet mask, and you perform a binary AND operation of this mask and the IP address to obtain the network part of the latter. The mask can be (in principle) any value, be it 16 bits, or 24 bits, or 30 bits. The remainder is used to address the hosts on that special subnet.
To answer your questions:
1 - If you are talking of the /18 subnets, NO. The first subnet's available IP addresses range from 192.168.0.1 - 192.168.3.254, and the next range is 192.168.4.1 - 192.168.7.254.
2 - Not sure I understand your question. A subnet mask on its own is pointless. 255.252.0.0 is equivalent to /14, so the subnets 192.168.0.0/14 would be (given you want four with 262142 IP addresses in them)
Please be aware that you are leaving the non-routeable Class C private range 192.168.0.0/16 with these.
Before I even attempt this, is it possible to grep for a pattern, maybe a partial sentence like "go to page 3", assign that to a variable and then use awk or something to pull out the 3 and assign it to a variable? So first I would have
Gotopg = "go to page 3"
then
page = 3 (9 Replies)
Hi
In my shell script, I'm trying to find the line count of a file and assign it to a variable.
LINE_COUNT=$(wc -l $FILE_NAME)
But when i display LINE_COUNT, i'm getting the linecount concatenated with the file name. I want only the number. How can i get the line count alone ? Someone... (2 Replies)
hi all,
i want to know where i can add and IP address so when i do a "w", i can see what IP is assigned to which tty? i know in tru64 you just added an entry to /etc/hosts. this does not seem to be the case with hpux.
thanks (12 Replies)
hi all,
in ksh, how do i assign the output of a find command to a variable, e.g
am trying something like this :
totalNoFiles=$(print find ./ -name "SystemOut*.log");
but when i echo $totalNoFiles it displays
find ./ -name "SystemOut*.log"
instead of the total number of... (2 Replies)
can we make a global variable and store character values and add other values to that variable ?? for example
a="hello, John"
and can we add value ". How are you? so
a can have
"hello, John. How are you?"
can someone help me?? (2 Replies)
I want to print between the range two patterns if a particular pattern is present in between the two patterns. I am new to Unix. Any help would be greatly appreciated.
e.g.
Pattern1
Bombay
Calcutta
Delhi
Pattern2
Pattern1
Patna
Madras
Gwalior
Delhi
Pattern2
Pattern1... (2 Replies)
Hi admins
i want to assign new ip adress to my aix 5.3 machine which is in LPAR
ent3 Available Virtual I/O Ethernet Adapter (l-lan)
ent0 Available 05-08 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)
ent1 Available 05-09 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)
ent2... (0 Replies)
Unable to get the value to a variable.
set -x
cd $HOME
echo "Enter the server name"
read a
echo $a
i=4
j=1
k = ps -ef | awk '/server1/{ print $4 }' | tail -$i | head -$j`
echo $k
When I do the same in command line it works, however the same does not work when I provide that in the... (1 Reply)
Hi All,
I'm a bit confused about assigning IP address from IP Ranges.
I am using this scenario below to understand.
Scenario
Adatum.com an international IT solutions company, is launching 12 new branches in a new country where they currently have no existing branches. The sWin CIO has asked... (3 Replies)
Hi,
I couldn't find any thing on google about it and have been trying to figure this out but am not getting anywhere. I want to know if its possible through a script. I have a file with columns start time and end time separated by a comma, basically there are some other columns which I need to... (30 Replies)
Discussion started by: dsid
30 Replies
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