I wrote a script to test many systems to see if they are up or not. if a system is down, i am notified by email
now, most of the time,when systems are down in my enviroment, it is because the user accidentally or purposely (not knowing the consequences) hit the power button. so these problems... (3 Replies)
Hi all,
I'm trying to write a shell script that will ping a site and and write the date and 1 or 0 (for success or no success) to a file.
it looks roughly like this:
#/bin/sh
set mydate = `date`
set myvar = `ping -c 1 hostname | grep -c "100%"`
if ($myvar == 1) then
echo... (1 Reply)
I can ping by ip address but not by host name
everything is on the same subnet
check all of the normal files
I can telnet in to the unix box but can not open a connect to
the share dir.
unix ver sunSO 5.9
all the other computers ar Windows XP (with firewall turn off)
Thanks... (1 Reply)
I want to access window file system through Samba. when i ping Window machine through linux machine it connect, but in reverse case it shows "Request time out". could any one suggest what problem may be. (1 Reply)
Comp1=192.168.100.2
Comp2=192.168.100.6
both the comp have win2000 Os.
Using Cross cable i have connected back to Back.
When i ping From Comp1 to Comp2 its working fine.
But
When i ping From Comp2 to Comp1 its not working.
I know don't know what went wrong please help me out.... (4 Replies)
Can someone tell me how I can get the following bolded output without having to issue the control C key when a ping is running?
ping -s cca-wl6
PING cca-wl6: 56 data bytes
64 bytes from cca-wl6: icmp_seq=0. time=0.796 ms
64 bytes from cca-wl6: icmp_seq=1. time=0.581 ms
64 bytes from... (5 Replies)
Hi All,
I'm testing ping command on two servers.
A,B,C,D are servers
From A-->B:
ping -c 3 -p ff -s30720 <B IP-Addres>
This works fine.
From C-->D:
ping -c 3 -p ff -s30720 <D IP-Addres>
This is NOT working and 100% packe loss :(
But if I use 8700 instead of 30720 for packet size... (6 Replies)
Hi friends,
I am running Solaris 10, which is connected to a DSL router running DHCP. During the installation I chose not to use DHCP and assigned a permanent IP address to solaris machine. I also did not choose any name service as well. The rest of the details are as under.
Solaris Machine
IP... (4 Replies)
I am having a problem with a new server build that has got me completely baffled. This server has a private back end network so the way it is supposed to work is that the server thinks its ip address is 10.131.0.48 but the rest of the world knows it as 199.68.100.100 per DNS. It has to be this way... (2 Replies)
Discussion started by: keelba
2 Replies
LEARN ABOUT CENTOS
simple
Simple action in tc(8) Linux Simple action in tc(8)NAME
simple - basic example action
SYNOPSIS
tc ... action simple [ sdata STRING ] [ index INDEX ] [ CONTROL ]
CONTROL := { reclassify | pipe | drop | continue | ok }
DESCRIPTION
This is a pedagogical example rather than an actually useful action. Upon every access, it prints the given STRING which may be of arbi-
trary length.
OPTIONS
sdata STRING
The actual string to print.
index INDEX
Optional action index value.
CONTROL
Indicate how tc should proceed after executing the action. For a description of the possible CONTROL values, see tc-actions(8).
EXAMPLES
The following example makes the kernel yell "Incoming ICMP!" every time it sees an incoming ICMP on eth0. Steps are:
1) Add an ingress qdisc point to eth0
2) Start a chain on ingress of eth0 that first matches ICMP then invokes the simple action to shout.
3) display stats and show that no packet has been seen by the action
4) Send one ping packet to google (expect to receive a response back)
5) grep the logs to see the logged message
6) display stats again and observe increment by 1
hadi@noma1:$ tc qdisc add dev eth0 ingress
hadi@noma1:$tc filter add dev eth0 parent ffff: protocol ip prio 5
u32 match ip protocol 1 0xff flowid 1:1 action simple sdata "Incoming ICMP"
hadi@noma1:$ sudo tc -s filter ls dev eth0 parent ffff:
filter protocol ip pref 5 u32
filter protocol ip pref 5 u32 fh 800: ht divisor 1
filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1
match 00010000/00ff0000 at 8
action order 1: Simple <Incoming ICMP>
index 4 ref 1 bind 1 installed 29 sec used 29 sec
Action statistics:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
hadi@noma1$ ping -c 1 www.google.ca
PING www.google.ca (74.125.225.120) 56(84) bytes of data.
64 bytes from ord08s08-in-f24.1e100.net (74.125.225.120): icmp_req=1 ttl=53 time=31.3 ms
--- www.google.ca ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 31.316/31.316/31.316/0.000 ms
hadi@noma1$ dmesg | grep simple
[135354.473951] simple: Incoming ICMP_1
hadi@noma1$ sudo tc/tc -s filter ls dev eth0 parent ffff:
filter protocol ip pref 5 u32
filter protocol ip pref 5 u32 fh 800: ht divisor 1
filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1
match 00010000/00ff0000 at 8
action order 1: Simple <Incoming ICMP>
index 4 ref 1 bind 1 installed 206 sec used 67 sec
Action statistics:
Sent 84 bytes 1 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
SEE ALSO tc(8)tc-actions(8)iproute2 12 Jan 2015 Simple action in tc(8)
05-17-2016
