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Questions tagged [ping]

Ping is a mechanism to see if a remote host is reachable via an IP network

Ping is used to send an ICMP packet to a remote host. The ICMP type sent is an echo request, and the type the remote host will send back is an echo reply. Some firewalls or hosts may block ICMP, so ping should not be the only tool used for troubleshooting.

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Can ping but cannot traceroute from Linux. Can do both from Windows. What gives?

So here's the issue. I have two different computers behind the same network. Both have the same gateway, IP address prefixes, etc. Computer 1: Windows XP IP 192.168.0.15 This computer can ping and tracert out of the network to another computer I'm…
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Domain Controller has mysterious 3rd IP Address

i have a domain controller with 2 NIC's. For some reason when i ping it from other computers, both on and off the domain it is responding from an ipaddress that doesnt belong to either of them. Does anyone know why? WAN IP: xxx.xxx.xxx.xxx LAN IP:…
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Strange network connectivity problem

Here is my network connectivity: cable modem | |(WAN) wrt54g (default gateway, 192.168.1.1) -- earth |(LAN) | Simple Switch1 | | | | | SimpleSwitch2- neptune | | | | mars …
user18199
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Ping to IP address returned Destination Unreachable for a different IP address... huh?

This was totally an isolated incident, but I performed this command: ping 192.168.1.134 and got this result [image]: Pinging 192.168.1.134 with 32 bytes of data: Reply from 192.168.1.133: Destination host unreachable. Reply from 192.168.1.134:…
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Alpine ping: operation not permitted

I'm using Alpine (which uses busybox), and trying to get ping to work. First I tried installing iputils per https://serverfault.com/a/1001312 . No dice. Then I found something that said I need to set the sticky bit, but it's already set. What's…
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Unable to reach network namespace through master

I'm trying to create an isolated lab using network namespaces. It works correctly, that is, only the machines in the network namespace can talk. But now I want reach the machines by localhost using v-net-0 like a router. Here what i do: ip netns add…
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Hyper-V inconsistent/high latency between two VMs on the same vSwitch

This is a clean installation of Windows 10 1903 with Hyper-V, though I've experienced this in previous versions of Windows 10. Add a private vSwitch (so, not tied to any physical network adapter). Install Linux on two VMs on the same server (tested…
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Why does my router go down every ~16 hours and how can I debug it further?

I have a router that is connected to a larger managed network (such as a university campus network). The router is configured with a static WAN IP address and provides NAT and DHCP to the LAN. After about 16 hours of operation, the router is not…
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Not able to ping VM and/or mount NFS after changing IP via POSTROUTING

Imagine the following setup. I have a machine A which exports a network share and is reachable under, say 1.1.1.1. A second B machine with an IP, say 2.2.2.2, is mounting that share, everything's fine. Now I'm trying to setup some kind of blue/green…
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broadcast ping from wlan client - just 2 other clients respond?

The question came up when trying to integrate my KNX-IP interface via the java Calimero library. My implementation (running on the Raspberry - via WLAN) did not find the KNX IP interface, so I started deeper investigation. Meanwhile I disabled…
Christoph Bimminger
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why the ping value different from the mtr?

Why the ping command's output value is different from the mtr command ? I am curious。 ping: about 0.5ms mtr: about 2.3ms
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Why Linux continues to use disconnected ethernet interfaces?

I have a Linux system with two ethernet interfaces, eth0 & eth1, which are used on the same subnet. At times, I see that even when one of the interfaces is disconnected (cable unplugged), Linux continues to use its IP address. For example, if eth0…
Sunny Yates
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Server suddenly cannot ping itself, all other LAN computers can ping it

Today my Ubuntu 17.10 server suddenly lost its ability to connect to its own IP services. It seems to be working perfectly as far as other computers on the network are concerned; for example, other computers can ping it, and they can access the…
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How to identify PID of process that is generating lots of ICMP ping requests?

I have a box that is generating lots of outgoing ICMP requests. I am able to see a few happening every second with tcpdump -nni ens192 icmp. However, I don't have anyway of tracing these back to the PID that is causing them. Any thoughts?
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asymmetric ping times but constant file xfer times?

When I ping ping system a from system b; I get an avg of 1.494ms. When I ping system b from system a; I get an avg of .896ms. I ran a test my pinging once every 10 second for 1.5 hours. I ran this on both machines. I then re-ran the test several…
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