A tool commonly used to test the reachability of a given host, either on the internet or in a local network.

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Ping a host, check if alive or not, and send result to file via a shell script

To clean out my custom hosts file and remove dead domains on Windows I ping the hosts from domains.txt, and if I get a reply I add that host to result.txt: @echo off >result.txt ( for /f %%i ...
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216 views

How can you get ping to print human readable timestamps?

Ping can print you a timestamp on every line but its in unix date format :( ping -D localhost PING localhost.localdomain (127.0.0.1) 56(84) bytes of data. [1415629479.482938] 64 bytes from ...
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12 views

Prioritize virtual machine bandwidth

I installed a Windows Server 2012 virtual machine (VM Ware Workstation) on my Debian server that I rented (to which I have SSH access only, and which is in another city with over 1 GB bandwidth) to ...
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2answers
72 views

How can I filter ping results by time?

How do I filter out any pings that are under a certain ms, ie, only echo ping responses above 500ms to the text file? IP=$1 SECONDS_Between_Pings=$2 ping -i $2 $1 | while read pong; do echo $(date) ...
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1answer
1k views

Using ping on multiple interfaces on a NIC

I have two systems and each have a NIC with two ethernet ports. One system has a verified NIC card, but the other has a NIC which has to be verified. I use ping to verify whether the interfaces on ...
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1k views

ping: unknown host with iptables enabled

I can't ping www.google.com. However I can ping the IP address: ping 74.125.237.142 At first, I thought it is a problem with my DNS settings. But I checked my resolv.conf, hosts, and hostname ...
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218 views

Running an infinite loop on startup

I'd like to run a command at startup which pings a certain address every 10 minutes and writes the result to a file. I've figured out now how to do the pinging and file writing and the 10 min ...
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1answer
222 views

Shell command/script to see if a host is alive?

I'm trying to figure out more ways to see if a given host is up, solely using shell commands (primarily bash). Ideally, it would be able to work with both hostnames and IP addresses. Right now the ...
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78 views

Display hostname in ping output

When I ping my Linux server (running in a VM on my Windows7 host) with the following command: ping -a 192.168.56.*** I get the results shown below. Why isn't it resolving my server's name? ...
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48 views

Can't browse Internet in Redhat 7

I installed RHEL 7 using server with GUI with no added option on my local virtualbox, but I cannot get Firefox connected to the Internet. I checked /etc/resolv.conf contains nameserver setting I ...
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428 views

Why is ping much faster when using -f

I'm pinging the same host from the same machine at the same time. And when using -f, the result is almost twice as good: [root@localhost Desktop]# ping 196.1.6.16 PING 196.1.6.16 (196.1.6.16) 56(84) ...
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534 views

Bash ping script file for checking host availability

I am trying to write a bash script in a file that would, when run start pinging a host until it becomes available, when the host becomes reachable it runs a command and stops executing, i tried ...
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12k views

Changing the IP Address in Solaris 11

I am trying to change the IP address in Solaris, but am failing to do so. The IP address needs to be a fixed number, like 10.0.11.10 I have tried changing the IP address in /etc/hosts which I ...
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55k views
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3k views

Problem pinging from a specific interface

I'm trying to ping from a specific interface, I have a wired and a wireless connection both going into my laptop. My wired adaptor eth0 is on the IP 172.16.109.75 My wifi adaptor wlan0 is on the IP ...
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2answers
11k views

How do I access files on an external hard drive? [closed]

edited 02-25: I thank @Anthon for his replies. I still do not, however, understand the meaning or the how of "pinging" ("Once you update your Q, ping the commenters..."). I also do not understand the ...
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3answers
135 views

For some IPs, ping -c 4 -W 1 ip | cat does not output anything until ping has finished, whereas it does for others

Why do $ ping -c 4 -W 1 127.0.0.1 | cat and $ ping -c 4 -W 1 1.1.1.1 print their output immediately, whereas $ ping -c 4 -W 1 1.1.1.1 | cat prints nothing for four seconds, then prints all ...
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2answers
432 views

Why am I getting DUP! reply when using ping -A

We have 2 VM's running on ESX 5.1. When I do a ping -A, after a while I get every second ping as a DUP!. When doing a normal ping, I get 5 or 6 DUP!s, and then it returns to normal. Any ideas what to ...
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1answer
39 views

Force ping to write before interrupt

I am trying to get ping to continuously write some times to a file. When I run $ ping 10 10.1.10.28 | perl -ne '/time=(\d+\.\d+)/ && print "$1\n"' It returns one number every several ...
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1answer
1k views

Check ping statistics without stopping

Is there a way to tell ping to show its usual termination statistics without stopping the execution? For instance, I'd like to quickly view: --- 8.8.8.8 ping statistics --- 2410 packets transmitted, ...
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2answers
892 views

Quickly check whether many network hosts are up-and-running

Objective: check if a host is up-and-running on the network, with a method that can be efficiently parallelized over many hosts. Emphasis on a QUICK turnaround of the check. Reason to emphasise ...
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103 views

Received DUP when using ping. What should I do?

I was pinging Google last night and one of them came back as DUP(!). I did some reading and I found this in the man pages on ping(8): Damaged packets are obviously serious cause for alarm and ...
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39k views

Host unreachable and I do not get why

I can not open a specific website. This is a website hosted by our company, and I know it is up. However, these are my symptoms: VARIABLES: host.com - the website I can not open x.x.x.x - the IP of ...
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1answer
965 views

recvmsg returns 'EAGAIN (Resource temporarily unavailable)'

After a recent server move, we are troubleshooting this wierd issue of one of the server losing n/w connectivity for no apparent reason and regaining the connectivity in a few seconds or minutes. ...
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33 views

Which Privileges Should Assign For Create Raw Sockets

I want to run an ICMP command to ping an IP Adress at Java: InetAddress.getByAddress("XXX.XXX.XXX.XXX".getBytes()).isReachable(1000); However there is a security restriction that: Normal users are ...
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1answer
329 views

I can ping internal to outside but not from outside to internal (Static IP)?

I have a static IP provided by the administrator of my Linux CentOS 6.5. The problem is that while I can ping this machine, connect to it and use it to access the internet from within my network, I ...
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110 views

openconnect - I can ping a website but can't wget or access by browser

I need to access the VPN of my university. On their website they provide the following solution: install openconnect install vpnc login to vpn via: # openconnect --script /etc/vpnc/vpnc-script ...
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1answer
168 views

Unix shell script for server alerts

Below is my shell script which is written in another x to find the health of server y. ( I have not written in server y because there is no functionality of getting mails) #!/bin/bash ...
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2answers
147 views

Is there an ICMP echo request service?

Often, in applications that I develop, I like to include a network status indicator for various devices on the network. The easiest way to monitor these devices is by pinging them. But ICMP echoes are ...
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1answer
113 views

IP access okay but ping doesn't work

I have a laptop connected to a Wi-Fi, and let's say I am testing the connection to a website ("randomwebsite.com", IP:123.123.123.123) Through a terminal I have tested ping: ...
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1answer
220 views

Why can I ping google.com but not www.google.com [closed]

I can $ping google.com and get data back PING google.com (74.125.227.96): 56 data bytes 64 bytes from 74.125.227.96: icmp_seq=0 ttl=56 time=26.939 ms 64 bytes from 74.125.227.96: icmp_seq=1 ttl=56 ...
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1answer
124 views

Why doesn't Ubuntu use capabilities on ping?

After running, $ ls -l /bin/ping -rwsr-xr-x 1 root root 34740 Nov 5 2012 /bin/ping I wonder, why doesn't Ubuntu use capabilities (i.e. raw sockets) rather than setuid?
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1answer
153 views

Most reliable way to check for connected client?

I have an embedded Linux OS developed from scratch using Yocto. This talks to a Windows XP/7 client. The embedded OS runs a DHCP server and gives an address to the client. The problem is that the ...
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2answers
2k views

Ping multiple hosts and execute command

I'm very new in bash scripting and unix so I will need some help on this.I have 7-10 hosts which I want to ping from one of the servers via cronjobs. What I want is when host is up to execute command ...
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2k views

Ping command results in packet loss

Whenever I ping on my personal computer, nothing gets displayed other than a single statement. Upon stopping execution, I see that several packets were transmitted in the statistics. On top of all ...
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1answer
409 views

Why ping an IP is different to ping a website?

I've noticed a strange behaviour (at least, I can't get out). Ping IP, specifying packet size: ping -s 128 8.8.8.8 I get: PING 8.8.8.8 (8.8.8.8) 128(156) bytes of data. 72 bytes from 8.8.8.8: ...
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3answers
426 views

Is there some way I can start a (repeating) ping while the network is unreachable?

My ping command (on Debian 6 or 7) will repeatedly attempt to ping a server even while the network is down, if the network was up when it was started. Is there some way to start ping while the network ...
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1answer
151 views

Route a local connection via an ethernet link in QNX

I am currently facing a challenge in QNX, where I have 2 Network Interfaces - viz. one Network port from PCIe Ethernet Expansion card (wm0) and other from the normal Ethernet port (en0). I have ...
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3answers
19k views

Why can't I ping Google?

I can't ping google.com (unknown host). But I can ping IP addresses. I tried to ping the IP address of Google but it doesn't work. resolv.conf nameserver 8.8.8.8 nameserver 209.139.209.33 ...
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1answer
139 views

Get a faster response for a ping

I noticed that the answer to my ping is slower in one debian machine that another. For the first one when i ping to 8.8.8.8: 64 bytes from 8.8.8.8: icmp_req=1 ttl=47 time=29.6 ms For the second ...
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2k views

traceroute gives only stars + how to fix

Please advise about the following problem. When I do: $ traceroute 8.8.8.8 I get in the output showing only stars, even though pinging to google.com ( 8.8.8.8) appears to be working. Please ...
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1answer
2k views

Bash Ping to return 'alive' IP addresses

(Disclaimer- I know this can be done more easily with nmap, but its supposed to be practice for bash shell scripting). $ scriptname 192.168.42 18 23 Checking: 192.168.42.18 19 20 21 22 23 Live ...
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1answer
210 views

How do I create an IPv6 overlay network?

I would like to create host-only IPv6 networks on two hosts and then route between them. On each host, there will be a dummy interface, at ipv6_prefix::9. I would like to be able to ping that ...
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152 views

What could cause a ping request to return inconsistently timed results

Here is a sample run: 64 bytes from 192.168.1.9: icmp_seq=27 ttl=64 time=8852.917 ms 64 bytes from 192.168.1.9: icmp_seq=28 ttl=64 time=7918.074 ms 64 bytes from 192.168.1.9: icmp_seq=29 ttl=64 ...
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1answer
101 views

Did this tutorial block pings to my server?

I am a programmer teaching myself linux admin stuff. I followed this tutorial to setup a firewall on a VPS. As a part of that tutorial, I block all traffic except for web traffic and SSH traffic. I ...
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3k views

How to redirect the output of any command?

I'm trying to write a simple script to monitor my network status, without all of ping's output: ping -q -c 1 google.com > /dev/null && echo online || echo offline The problem is that ...
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117 views

High ping/latency on Xen box

I am having problems with my Xen box. Once in a while it has too high ping/latency and it is very annoying. It does not matter if I am pinging server from outer network (LAN0) or inner network ...
5
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2answers
957 views

My Ping command does not seem to ever finish. Does that mean it is suceeeding?

I am pinging a remote IP. I know very little about the Ping command. When I ping the IP, it keeps going and going... I am not using the -t option. Me$ ping 137.30.124.104 PING 137.30.124.104 ...
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3answers
11k views

What prevents a machine from responding to pings?

I have a CentOS release 5.4 linux box on Amazon EC2 that I'm trying to set up to be monitored via Nagios. The machine is in the same security group as the nagios server, but it seems to be ...
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1answer
562 views

Suppress “Alarm clock: 14” from ping

I've made a simple script for rebooting my router and afterwards showing a progress bar until my computer has an internet connection again. When running the script I get the following output: The ...