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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10
votes
2answers
3k 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, ...
0
votes
1answer
20 views

Can I see the summed up results of the ping command while it is running? [duplicate]

When I run the ping command it outputs information for each ping and in the end, when I kill the process it outputs some overall statistics --- 192.168.0.1 ping statistics --- 10 packets transmitted, ...
2
votes
2answers
892 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 ...
3
votes
1answer
41 views

What ports need to be open on a firewall to access the internet?

Let's say as the example that I have a firewall that blocks ALL ports from all sources/destinations. What ports would I need to open to be able to successfully run: ping google.com ...and are ...
2
votes
0answers
54 views

How to debug what is stopping ping to respond on our server?

We used to have a sysadmin person months ago who had disabled ping response on one of our servers. But now we want to re-enable ping response. I tried to check if the ping was disabled from config. ...
1
vote
1answer
860 views

cannot ping my computer on local network

I am running on 64 bit OpenSuSe 13.2 with Gnome 3 desktop environment and unsuccessfully trying to set up Samba Server. I have another computer running windows 8.1 from which I am pinging the ip ...
-3
votes
1answer
30 views

Online state change

Are there ready script in bash or python which pings target and reports only online state change? Also would nice to have average time between failures.
6
votes
4answers
18k 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 ...
0
votes
1answer
30 views

sendmsg: Network is unreachable

I set the IP address of my network card to a particular value to be able to talk to a piece of hardware. Then I try to ping it, which works for a few seconds, until I get the error ping: sendmsg: ...
0
votes
2answers
24 views

Output pings with time greater than 100ms to file with a timestamp appended

I want to save in a file every ping with a time greater than 100ms and append a timestamp to every line. Searching I have managed to get this: ping HOST | grep --line-buffered "time=[0-9][0-9][0-9]" ...
3
votes
0answers
53 views

How can I know which IP address of a host is reachable from another?

I don't particularly need a "solution" to something, I'd just like to understand more of the landscape here. So on my CentOS box, I installed a CentOS VM specifically for learning Puppet. When the ...
1
vote
1answer
61 views

how can one manually assign a permanent / static IP address with “ip addr add”?

After an IP address is assigned to this network interface, with any of the the following commands: ip addr add 10.0.0.0 dev eth1 valid_lft forever preferred_lft forever ip addr replace 10.0.0.0 dev ...
7
votes
4answers
44k 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 ...
2
votes
1answer
60 views

Execute a command after each output line from ping command

I am trying to build a one-line command to monitor when my Internet connectivity drops. I'd like it so that if I run ping www.google.com indefinitely (one ping per second), if the word "timeout" ...
0
votes
1answer
82 views

CentOS 6.7: network is unreachable after a new clean installation

I have a new clean installation of CentOS 6.7, it is not on a VM, but on a dedicated notebook. During the installation procedure I've configured my WiFi connection and have added it on eth0 ...
4
votes
2answers
147 views

Why does ping run forever by default in Linux? [closed]

What was the rationale for the design decision to make ping's default behavior to ping forever? For example, the following basic usage will ping address 127.0.0.1 forever: $ ping 127.0.0.1 ...
1
vote
1answer
46 views

Linux server able to wget but not able to ping

A proxy server was added using export http://link:port/. I try to ping google.com and there is no response, the DNS is able to resolve an IP. wget of google.com works. routes: Destination ...
3
votes
1answer
159 views

Wget and curl can work normally, but ping fails

When I ping www.google.com and 8.8.8.8, I get no reply: # ping www.google.com PING www.google.com (216.58.221.228) 56(84) bytes of data. ( no response) # ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) ...
4
votes
5answers
396 views

How to log Internet connection drops

I need to execute a script as soon as my raspberry pi gets connected to the Internet. However I was wondering if there was a better way than just pinging Google every minute or so. My problem is that ...
-1
votes
5answers
4k views

network: destination host unreachable

So Im using linux oess(centos). in the terminal im trying to ping 8.8.8.8 to see my connectivity. so it says: Network is unreachable Than I typed ifconfig: inet addr: 192.168.56.101 ...
0
votes
1answer
85 views

Can't setup ssh connection with bridge

I would like to set up an ssh connection to a device, which is bridge. It's a device to put between router and PC and the traffic just goes through. I don't have a ip-adress assigned to the bridge, so ...
3
votes
2answers
977 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 ...
2
votes
1answer
79 views

Time synchronization, use NTP or just socket?

I am using a PC and a raspberry pi(both run Linux) to gather sensor data, raspberry pi gathers laser scan data, PC gathers image captured by camera. I must synchronize time for these two machines. I ...
28
votes
3answers
81k views
2
votes
1answer
39k views

Unable to ping gateway & other Linux boxes on same network

I'm somewhat new to Linux, but I'm trying to network a few Linux machines. I can't seem to be able ping the gateway or the other Linux machines. My scenario: I have a few Linux boxes set up on a ...
1
vote
2answers
189 views

Pinging between Mesh Network Nodes OpenWrt

I have two mesh nodes that I have configured to be on a mesh created using OpenWrt. I used the tutorial here to set that up. When I ran iw dev $MESH_IFACE station dump, I got the output that I ...
1
vote
0answers
53 views

Why does flood ping to localhost result in lower RTT's?

I used ping to do an estimate of lower bound for HTTP request times as part of a feasibility study. In order to make the test faster I lowered the interval of the ping (to get enough pings to get a ...
0
votes
3answers
212 views

ping output statistics to file

[root@localhost ~]# while true; do timeout -s 2 1h ping 96.120.16.121 | ts '%Y-%m-%d %H:%M:%S |' | tee -a ping.log; done easier to read format: #!/bin/bash while true; do timeout -s 2 1h ...
0
votes
1answer
190 views

arp-scan shows a machine, but I can't ping it

I have been facing a particularly anomalous network issue. For a particular test, I set a Class A IP on my Windows Machine and tried using arp-scan and ping separately. Here are my Windows settings : ...
0
votes
0answers
56 views

linux to linux IP MASQUERADING failed (can't ping ip server)

I'm new in linux, i'm trying to IP MASQ. So the diagram is like linux A is connected to HUB and Internet, and linux B is connected only to HUB. In linux A i have eth1 (10.10.10.5) and eth0 ...
1
vote
0answers
52 views

How to disable IPv6 ping response in Linux without firewall

How can I disable IPv6 ping responses in Linux without using the IPv6 firewall? This question covers how to do this using the IPv6 firewall via iptables, but I'm using an embedded system that doesn't ...
1
vote
2answers
2k 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
2answers
3k 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? ...
1
vote
1answer
3k 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 ...
-1
votes
2answers
110 views

Curl, ping hangs/waits when using private network ips

I have a whole bunch of servers working inside my office premises private network. When I try to run my tests outside office network, curl/ping/python/nodejs requests library, all of them wait ...
3
votes
1answer
135 views

Some ICMP-Reply messages don't arrive in User Space in recent Kernels

I'm moving an application from 2.6.23 (yes, it's ancient; that's why we are moving) to 3.18LTS. The application monitors multiple network links to the same target with ping packets. The different ...
5
votes
3answers
2k views

ping to send 0 bytes

Is it possible for ping command in Linux(CentOS) to send 0 bytes. In windows one can define using -l argument command tried ping localhost -s 0 PING localhost (127.0.0.1) 0(28) bytes of data. ...
2
votes
3answers
2k 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 ...
1
vote
1answer
611 views

centos: ping6 unknown host

I have centos 6.5 with ipv6 enabled and working (partially). When I'm trying to execute "ping6 bin6.it" it returns error "unknown host": [root@centos ~]# ping6 bin6.it unknown host Host is ...
1
vote
1answer
83 views

First ping after ifup fails

I have a weird issue on Debian 8 on a provisioning workflow, the steps are : The debian is DHCP configured (from the PXEBoot) VLAN Change on ESX ifdown on eth0 reconfigure /etc/network/interfaces ...
3
votes
3answers
8k 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 ...
0
votes
0answers
96 views

I can't ping the gateway

The network error is that I can't ping the gateway after ip forwarding configuration. Here's the my configuration: linux microcore(server)(First PC) sudo su ifconfig eth0 192.168.2.200 netmask ...
-1
votes
1answer
36 views

Arping to google.com fails

I am trying to follow the instructions here, https://wiki.archlinux.org/index.php/Netconsole to set up netconsole in ubuntu machine. This uses, arping command which is non-responsive when i run it in ...
16
votes
3answers
18k 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 ...
2
votes
1answer
266 views

ping statistics

When ping displays statistics the field mdev is the std deviation of all the ping times. It is the average time (in ms) to the average avg. But because ping times are stricktly positive, I don't ...
0
votes
1answer
485 views

Arch-Linux after system-update no internet connection but connection lan

Yesterday I updated my Arch Linux after 2 Months with sudo pacman -Syu and after the reboot I don't get any connection with the Internet neither from Browser nor with Skype, etc. When I try to ping ...
3
votes
3answers
172 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 ...
0
votes
0answers
147 views

Can't ping another router in my network (OpenWrt)

I'm playing around with OpenWrt and followed this tutorial step by step to set up a mesh network: http://wiki.openwrt.org/doc/howto/mesh.80211s Problem: When I got to the end and ran these two ...
0
votes
1answer
26 views

dig domain replay SOA

I have a domain and when I use dig jeeja.biz it just gives me my server ip address. ;; ANSWER SECTION: jeeja.biz. 13914 IN A 209.15.212.171 But when I use the same command on another ...
1
vote
3answers
16k 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 ...