You're assuming it's a 24-bit subnet. That's usually a good assumption with a local address like 192.168.x.x. But there's no reason it couldn't be a 16-bit or 26-bit or other size subnet (16-bit or larger for 192.168).
Yhat's why you can use the IP command to get information about address - mask, i.e:ip addr show eth0returns me
You can then tail/grep/sed/awk or what you can to get what you need (in this example, the mask has 28 bits).
You can also try ip route list which gives other useful information.
All those commands can be used to get info to ping the whole subnet.
Last edited by frans; 04-10-2011 at 02:53 PM..
Reason: added info aboute ip route
Alright, I have being checking out various posting here trying to hack together something for a friend
Needed:
A script that can run in cron doing:
ping of several hosts and notifying via email when they are unavailable.
I am not going to post my non working messes (I am a basic... (11 Replies)
I have Digital UNIX V4.0B (Rev. 564) on alpha machine.
I'm trying to acces network in subnet (192.168.1.x).
Ip on Alpha comp. is from 192.168.3.X subnet. My default gateway on this network is 192.168.3.1 and it working OK from other machines. This machine is visible from same subnet... (2 Replies)
Hi,
My project needs to migrate the existing Subnet (255.255.255.0) to a new subnet and change the ipaddresses (currently C class). How can I do that. I need some information.
John (0 Replies)
Hello:
I have this script:
#!/bin/bash
#for loop
for ip in `cat ips`
do
ping $ip | grep "is alive">>pingtestlog
done
And its working properly with this input:
ericadm@amxcruas1> cat ips
10.196.60.4
10.196.61.210
10.196.62.73
10.196.61.152 (5 Replies)
Hello All,
We have added a windows host and its config files to Nagios master server and wanted to do a ping check alone at the moment however, the nagios master server identifies the host in its GUI and immediately disappears can anyone let me know the right approach to this one, We want to... (2 Replies)
HI,
I have a file serverlist in that all host names are placed.
i have written a small script
#./testping
#! /bin/bash
for i in `cat serverlist`
do
ping $i >> output.txt
done
so now it creates a file output.txt till here fine..
now each time i run this script the output file... (4 Replies)
Hi all,
New to this forum.
I have just been reading through a historical thread about some issues with IPMP.
Some tips from "Peasant" where very useful. Please see below
"Just couple of more hints regarding VM.
For VDS, use one VDS - one guest LDOM, don't put everything in primary-vds.... (9 Replies)
Bash script to subdivide a given subnet into a pre-defined number of smaller subnets. Show network/broadcast address, number of hosts and assign gateway.
For example:
Input:
./subnetter.sh 192.168.0.0/24 3 Output:
192.168.0.0/128 subnet 192.168.0.0 broadcast 192.168.0.127 gateway... (1 Reply)
Bash script to subdivide a given subnet into a pre-defined number of smaller subnets. Show network/broadcast address, number of hosts and assign gateway.
For example:
Input:
./subnetter.sh 192.168.0.0/24 3 Output:
192.168.0.0/128 subnet 192.168.0.0 broadcast 192.168.0.127 gateway... (1 Reply)
Running 3650 switch. I have this odd issue where I cannot get 4 new Centos 7 boxes pinging out on public IPs (nor pinging in), only gateway .1 and first public IP .2
This is what I see, which doesn't look normal. How do I fix this?
The server itself is configured fine (Centos 7)
# cat... (0 Replies)
Discussion started by: Bashed
0 Replies
LEARN ABOUT REDHAT
tc-route
Route classifier in tc(8) Linux Route classifier in tc(8)NAME
route - route traffic control filter
SYNOPSIS
tc filter ... route [ from REALM | fromif TAG ] [ to REALM ] [ classid CLASSID ] [ action ACTION_SPEC ]
DESCRIPTION
Match packets based on routing table entries. This filter centers around the possibility to assign a realm to routing table entries. For
any packet to be classified by this filter, a routing table lookup is performed and the returned realm is used to decide on whether the
packet is a match or not.
OPTIONS
action ACTION_SPEC
Apply an action from the generic actions framework on matching packets.
classid CLASSID
Push matching packets into the class identified by CLASSID.
from REALM
fromif TAG
Perform source route lookups. TAG is the name of an interface which must be present on the system at the time of tc invocation.
to REALM
Match if normal (i.e., destination) routing returns the given REALM.
EXAMPLES
Consider the subnet 192.168.2.0/24 being attached to eth0:
ip route add 192.168.2.0/24 dev eth0 realm 2
The following route filter will then match packets from that subnet:
tc filter add ... route from 2 classid 1:2
and pass packets on to class 1:2.
NOTES
Due to implementation details, realm values must be in a range from 0 to 255, inclusive. Alternatively, a verbose name defined in
/etc/iproute2/rt_realms may be given instead.
SEE ALSO tc(8), ip-route(8)iproute2 21 Oct 2015 Route classifier in tc(8)