Tagged Questions

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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2
votes
1answer
40 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. ...
1
vote
0answers
11 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 ...
2
votes
1answer
39 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 ...
1
vote
0answers
33 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 ...
0
votes
1answer
13 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 ...
0
votes
1answer
48 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 ...
4
votes
2answers
172 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) ...
5
votes
2answers
73 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 ...
1
vote
2answers
191 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 ...
0
votes
1answer
50 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: ...
0
votes
1answer
92 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 ...
3
votes
1answer
73 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?
2
votes
2answers
484 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 ...
3
votes
1answer
159 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 ...
0
votes
1answer
153 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: ...
4
votes
1answer
451 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, ...
2
votes
0answers
808 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 ...
1
vote
1answer
615 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 ...
3
votes
3answers
214 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 ...
0
votes
1answer
103 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 ...
2
votes
1answer
130 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 ...
0
votes
1answer
102 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 ...
0
votes
2answers
696 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 ...
-1
votes
1answer
761 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 ...
0
votes
0answers
30 views

No answer on Broadcastping

Actually I'm making an android app, but as the problem appears by using android's Linux runtime, I'm asking my question here. The thing is, that I need to ping the network's broadcast address to ...
2
votes
1answer
143 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 ...
1
vote
2answers
97 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 ...
3
votes
1answer
80 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 ...
0
votes
2answers
5k views

How do I access files on an external hard drive?

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 ...
11
votes
3answers
2k 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 ...
2
votes
3answers
10k 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 ...
1
vote
0answers
94 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 ...
4
votes
2answers
568 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 ...
3
votes
1answer
385 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 ...
1
vote
2answers
8k views

How to check whether certain port is opened or block on any other servers from a dev box?

I am trying to connect to one of our staging Cassandra servers on port 9042 and 9160 here in our company from a dev box.. Through the code, I am not able to connect to it... The program gets hanged at ...
2
votes
2answers
401 views

ssh reverse tunneling not working

So, I have a server and a home machine. My server can't talk to internet, but my home machine can. So, I set up a reverse tunnel through home to server using: ssh -R 9001:www.google.com:80 server ...
0
votes
0answers
59 views

Ping wireless interface from wired interface

I'm performing some wireless measurements. The setup I'm now using is composed of a WiFi AP and two laptops. One laptop (A) and the AP are connected to a common switch, while the second laptop (B) ...
4
votes
1answer
186 views

Strange ping behavior

I built a linux distribution using the Yocto Project, with little customization. It runs on a Single Board Computer. When I ping this machine, I get the following result: PING 10.128.11.1 ...
10
votes
2answers
4k views

Can one ping a NIC by MAC

I have an NIC card on a Debian machine somewhere. The machine is turned off, but I need to know whether the NIC card is turned on so that I can send a wake-on-lan magic packet later (from another ...
1
vote
2answers
2k views

Why doesn't “ping -l” works when ping works?

Bye all, ping AddressIp 64 bytes from indirizzoIp: icmp_req=1 ttl=42 time=149 ms while if ping AddressIp -l 1400 ping: cannot set preload to value > 3 ping AddressIp -t -l 1400 ping: can't ...
3
votes
1answer
2k views

LAN server with two network cards, can't telnet / ping to the second even if it works

I have an issue with an Ubuntu 12.04 LTS (updated) server. For reasons too long to detail, it has got one eth0 interface assigned to 192.168.1.9 and one Wifi wlan0 interface assigned to 192.168.1.10. ...
0
votes
2answers
173 views

Unable to ping the IP during first boot

I am trying to add some routes in /etc/init.d/S98 script but it is failing to ping the gateway IP and hence route addition is failing. But once all the S98 scripts are executed I am able to ping the ...
0
votes
1answer
158 views

Ping a list of IP addresses and outputing duplicates

In Linux how can I ping a list of IP addresses (in a text file) and only output those that have duplicate ping replies?
0
votes
0answers
249 views

unable to ping gateway and CLAN in Linux but pingable in Windows PC

We're installing RHEL 5.5 for our Voice Portal (Avaya). After configuring the IP address, gateway IP, and netmask we tried to ping it so we could see if it was pingable/active or not. Sadly its ...
-2
votes
1answer
322 views

Why doesn't “ping -vrf” works when ping works?

0:root@SERVER:/root # ping IPADDRESS PING IPADDRESS (IPADDRESS): 56 data bytes 64 bytes from IPADDRESS: icmp_seq=0 ttl=254 time=0 ms 64 bytes from IPADDRESS: icmp_seq=1 ttl=254 time=0 ms 64 bytes from ...
-2
votes
2answers
3k views

Loop over multiple addresses: ping and drop data into file

I would like to be able to have a script that will: look at a list of IP addresses Ping one of the addresses Take the data and drop it in to a file Move on to the next IP So far I have: cd ...
2
votes
1answer
3k views

Ubuntu server cannot access the Internet: appears DNS related

This is a Drupal website running Ubuntu 12.04 LTS on Linode. The server is just a website. It is not a DNS server or anything else. Here are my issues. It seems they are all related to DNS issues. ...
0
votes
1answer
1k views

Continues Pinging to background, save logs and show statistics

I'm trying to make a script that save the ping logs to .txt or .log file. To monitor if my connection is intermittent or not, I'm using this script: $nohup ping 8.8.8.8 > timeout.txt & Then ...
0
votes
1answer
255 views

ping timeout differences between OS X and Linux/other OSs

This function I wrote should exemplify the idiosyncrasy between OSX and Linux ping commands, in particular their -W timeout option: # Checks if a host is up-and-running and responding to pings ...
3
votes
1answer
6k views

Cannot reach outside network or IP after upgrading to Ubuntu 12.04

I am running Ubuntu 12.04 on my server but since the upgrade from 10.04 I can no longer reach any outside sources of the server. I can SSH into the box, but from inside here I can not reach anything. ...