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ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. It is available for virtually all operating systems that have networking capability, including most embedded network administration software.
The command-line options of the ping utility and its output vary between the numerous implementations. Options may include the size of the payload, count of tests, limits for the number of network hops (TTL) that probes traverse, interval between the requests and time to wait for a response. Many systems provide a companion utility ping6, for testing on Internet Protocol version 6 (IPv6) networks, which implement ICMPv6.
The ping utility was written by Mike Muuss in December 1983 during his employment at the Ballistic Research Laboratory, now the US Army Research Laboratory. A remark by David Mills on using ICMP echo packets for IP network diagnosis and measurements prompted Muuss to create the utility to troubleshoot network problems.[1] The author named it after the sound that sonar makes, since its methodology is analogous to sonar's echolocation.[1][2] The backronym Packet InterNet Groper for PING has been used for over 30 years,[timeframe?] and although Muuss says that from his point of view PING was not intended as an acronym, he has acknowledged Mills' expansion of the name.[1][3] The first released version was public domain software; all subsequent versions have been licensed under the BSD license. Ping was first included in 4.3BSD.[4] The FreeDOS version was developed by Erick Engelke and is licensed under the GPL.[5] Tim Crawford developed the ReactOS version. It is licensed under the MIT License.[6]
In cases of no response from the target host, most implementations display either nothing or periodically print notifications about timing out. Possible ping results indicating a problem include the following:
In case of error, the target host or an intermediate router sends back an ICMP error message, for example host unreachable or TTL exceeded in transit. In addition, these messages include the first eight bytes of the original message (in this case header of the ICMP echo request, including the quench value), so the ping utility can match responses to originating queries.[8]
The Identifier and Sequence Number can be used by the client to match the reply with the request that caused the reply. In practice, most Linux systems use a unique identifier for every ping process, and sequence number is an increasing number within that process. Windows uses a fixed identifier, which varies between Windows versions, and a sequence number that is only reset at boot time.
The payload may include a timestamp indicating the time of transmission and a sequence number, which are not found in this example. This allows ping to compute the round trip time in a stateless manner without needing to record the time of transmission of each packet.
The payload may also include a magic packet for the Wake-on-LAN protocol, but the minimum payload, in that case, is longer than shown. The Echo Request typically does not receive any reply if the host was sleeping in hibernation state, but the host still wakes up from sleep state if its interface is configured to accept wakeup requests. If the host is already active and configured to allow replies to incoming ICMP Echo Request packets, the returned reply should include the same payload. This may be used to detect that the remote host was effectively woken up, by repeating a new request after some delay to allow the host to resume its network services. If the host was just sleeping in low power active state, a single request wakes up that host just enough to allow its Echo Reply service to reply instantly if that service was enabled. The host does not need to wake up all devices completely and may return to low-power mode after a short delay. Such configuration may be used to avoid a host to enter in hibernation state, with much longer wake-up delay, after some time passed in low power active mode.[citation needed]
Recently I did upgrade NBU on this box to 3.2 and than did apply Maintenance Release 1 pack. after few days I did notice I am unable to ping one of its clients. NBU appliance as well this client is in the same subnet - so no routing involved, but still pings does not work. I did open a case with VRTS and waiting for their inputs...
2) ping is certainly handy but it's not actually required for NBU to function - what kind of backup errors are you seeing ? Can you telnet to the PBX, bpcd, and/or vnetd ports Client-->Media Server ? Media Server-->Client ?
Also I did on Fri a reboot of this appliance - then I was able to ping everything within the same subnet... but I was unable to ping default GW, so my VM based backups was jeopardized - so I rebooted it again and ended in the previous state. Could backup using vmware but was unable to restore... etc... I am really lost....
If you're using a VMWare policy type, then backing up the VM isn't an indicator of network connectivity b/t the appliance and the VM. I suspect you have a VLAN problem or a vSwitch problem where the vSwitch your client connects through isn't actually connected to the same physical network as the appliance. That's what the client not being able to ping the appliance but the appliance networking functioning for other paths tells me.
You say there is no firewall, but with Win2016 I've seen lots of admins insist for DAYS that the firewall is turned off only to find out 'oops, on this one server something went wrong with GPO and it's turned on'. I'd actively go allow NBU ports through, and check that ping responses aren't disabled.
I attempted to convert and use the java.net implementation with inetAddress and isReachable(). However it seems this method does not work as expected when running ignition as non-root user under Linux. I suppose I could run Ignition as root, or assign root privilege to my 'ignition' system account that I am using to run Ignition but those both seem like worse options than just "shelling out" to run a ping command.
Has anyone identified an easy way to get the java.net method to work with a non-root system user account under Ubuntu?
So I followed all of these steps in order to try and get the Java.net ping working from my edge server, but I still am getting nothing but failed pings here. CAP_NET_RAW is in fact set as an AmbientCapability for my Ignition Gateway service and I have reloaded the daemon and restarted the service. Still, nothing works. Is there any other solution to this issue that I am missing?
The ping binary sensor platform allows you to use ping to send ICMP echo requests. This way you can check if a given host is online and determine the round trip times from your Home Assistant instance to that system.This sensor is enabled by default. The default polling interval is 30 seconds.
The chart below shows a ping to the main Deco. You can see the perfectly regular ping spikes. This is just a local ping as you can see from the IPs, it has nothing to do with my internet connection, which is a stable 350mbs. So we can discount that.
I was using to chart the pings, it's free for 14 days. I was doing this ping from a macbook pro connected by WIFI to the Deco mesh. Now, I stumbled upon this article at one point : -pro-experiencing-ping-spikes-to-local-router
Which cites how OSX's location services by default effectively does a wifi scan regulalry and frequently, this has a detrimental effect across the network. I followed the steps in : to disable location services on my mac. I could go back and log to find the culprit, but I just turned the lot off - I've no real cause for them anyway. And as soon as I did that, the ping spike every 50s or so disappeared.
This issue came about as I was noticing this ping spike on other devices, (i.e. Xbox) which lead me to suspect the Deco as that was the common link, but I suspect the disruptive nature of this wifi scan performed by the laptop was the cause of the issue.
The last firmware major firmware update that occurred in the summer helped somewhat, but I'm hoping they pay more attention to this issue. I'm counting the days to the warranty to see if I have to replace this with a new system :/
I realized that it's impossible to use ping command with size option even with "privilege exec level 1 ping ip" as you can see above. I need to be able to use the entire ping command like this example below:
I have a file with about 500 devices which I need to ping to check if they're currently accessible or not from various subnets around my network. It's essentially a basic test to check for routing/accessibility issue.
I'm sure you recognize that ping is a common and relatively simple command. And, like many basic commands, there are some great options and techniques that make the tool even better. This article explores various tricks and tips to level up your ping knowledge.
By default, Linux sends continuous pings. Windows, by default, only sends four. One of my favorite uses of ping is to inform me when a remote server or network device has restarted. For example, imagine I'm remotely connected to a Windows server from my Linux laptop. The server needs to be rebooted before I can continue with its configurations. I can issue the reboot command and then set up a continuous ping from my laptop to the server. When the ping results show success, I know the reboot process on the remote machine has been completed. In the meantime, I can work on other projects.
I've already uncovered some good uses for ping with the above options. I particularly like the ability do a quick name resolution query. I've used the continuous ping during reboots trick more than any other, however.
You can use the ping command to test name resolution services, too. If you ping a destination by IP address, and the ping succeeds, you know you have basic connectivity. If you ping the same destination by hostname, and it fails, you know name resolution is not working. This is because ping could not resolve the given hostname to an IP address in the second test.
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