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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Changing CentOS 7 machines disables terminal access during background task

Based on this other posting, I typed the following command into a CentOS 7 terminal on a devbox that has the gnome GUI, and was able to continue to use the terminal for other commands while the ...
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2answers
43 views

Ping from subinterface

I have a sub-interface eth0:0 auto eth0:0 iface eth0:0 inet static address 192.168.2.96 netmask 255.255.255.0 gateway 192.168.2.1 and I try ping -I eth0:0 8.8.8.8 and I ...
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11 views

VPN SoftEther - I can't access VPN server directly from VPN connected device

I have installed and run VPN server (SoftEther) on my Raspberry Pi 3 (Raspbian) and it works fine except the fact that my PI works not only as VPN server but offers other services (SAMBA, FTP, APACHE, ...
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1answer
40 views

Forward ICMP Ping Packets to Interface

I've got a script that listens for ICMP ping packets (containing data payload) and while this works if you run it from command line, it doesn't work in a Docker container because ICMP ping packets are ...
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1answer
28 views

Cannot Ping, nor Curl, but Nslookup works

On a freshly installed Fedora Workstation running the default Workstation spin which installs Gnome. I'm having problems getting to a web server on the LAN with my browser. The commands curl and ping ...
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1answer
54 views

Cannot access internet from VirtualBox guest (Arch Linux)

I am using VirtualBox 5.0.20. The host machine is a MacBook running OS X 10.11.5 (El Capitan). The guest OS is 64-bit Arch Linux. When I installed Arch from the ISO, the guest's internet connectivity ...
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2answers
250 views

Run a ping command on list of servers and output to a file

I have a file servers.txt on a different server, with list of servers: server1.mydomain.com server2.mydomain.com server3.mydomain.com I want to first download this txt file, ping these servers and ...
3
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2answers
182 views

Why doesn't iptables receive the marked packet?

I was learning the ping command options. In that I found the -m option to set the mark for a packet. The below command sends the packet with marking of 10 to the 192.168.2.65. ping -m 10 192.168.2....
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1answer
22 views

Cannot ping OUT of a Mac OS X server

I have just inherited a Mac OS X server that is using pf. The problem I am trying to solve is why I can't ping OUT of the server. I can ping to the machine no worries, but just get timeouts on pinging ...
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1answer
37 views

High time until SSH asks for password

I've been noting recently that any host that I ssh to in LAN, waits like 5 seconds before asking for password. ping sometimes also waits, but less(like 2 seconds), but it shows it has resolved the ...
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2answers
63 views

What is the use of -l option in ping command?

I am learning ping command and its options. In that the -l option is provided, it sends that many packets to the destination without waiting for a reply. And for normal users the preload limit is 3. ...
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1answer
30 views

What is meant by ewma in ping statistics?

I was learning ping command implementation. In that I had one doubt that is If I provide the -f or -A option, finally in statistics report, it have two extra field when compare to normal ping. The ...
3
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1answer
66 views

Why ping receives another ping command packet?

I am learning about the ping implementation in C. The problem is, I was using a raw sockets to receive the packet. For all packets we have a identification value in ICMP header. I was running the ...
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1answer
31 views

How to determine if it is a fault of the Network Card?

Basically, I have a PC having problems. Let's call it POO. POO is a pc running Gentoo Linux, with KDE. It is quite freshly setup on an old hardware. So far I do not notice it has other problems, ...
6
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1answer
304 views

-m option does not work in ping command

I was learning the Linux ping command and its options, and read about the -m option which is used to mark the outgoing packet. When receiving, we can filter that marked packet result first. I am ...
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1answer
32 views

What is the use of socket buffer size in ping?

I am learn about the ping command implementation. In that I had a one doubt. The doubt is I know the socket buffer is for how many bytes transfer at a time in the socket. But how the ping command ...
6
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1answer
78 views

-T option result in ping command

I was learning about the ping command. I am not able to understand the output of ping command with -T tsonly and -T tsandaddr. The output is: $ ping -T tsonly 192.168.1.52 PING 192.168.1.52 (192....
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2answers
33 views

Output of ping command with option -T

I was learning about the ping command. In that I am not able to understand the output of ping command with -T tsonly and tsandaddr. The output is, $ ping -T tsonly 192.168.1.52 PING 192.168.1.52 (...
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0answers
186 views

Able to ping my host but getting no route to host

I have a elasticsearch service running on MY_HOST_IP(10.x.x.xx) and port 9200. I am able to ping 10.x.x.xx from my VM, but when I try to connect elasticsearch it gives me : no route to host ...
0
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1answer
22 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, ...
3
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1answer
99 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 ...
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74 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. ...
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1answer
31 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.
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1answer
48 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: ...
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2answers
35 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]" ...
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65 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 ...
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1answer
89 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 ...
2
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1answer
85 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
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1answer
116 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 pre-...
4
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2answers
182 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 ...
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1answer
56 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
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1answer
267 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) ...
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5answers
498 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 ...
0
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1answer
137 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 ...
2
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1answer
92 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 ...
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65 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
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3answers
275 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 ...
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70 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 (192.168.1....
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1answer
326 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 : ...
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0answers
60 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 ...
3
votes
1answer
141 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
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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. ...
1
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1answer
106 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 ...
1
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1answer
903 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 ...
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5answers
7k 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 ...
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1answer
37 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 ...
2
votes
1answer
347 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
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1answer
617 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 ...
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2answers
128 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 ...