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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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NTP syncs with local timeserver but not NTP pool servers

I setup an NTP server on a machine in another subnet and tried to ync my machine with the server and it works well. But when I try to ust the pool.ntp.org servers (I tried 0.pool.ntp.org, 1.pool.ntp.org, etc. and just pool.ntp.org servers), it does…
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How does the ping command differentiate between its ICMP responses and anothers?

If I have two shells open each pinging the same host, how do the two shells differentiate between the ICMP responses coming back for each shell?
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Can't ping from my Amazon EC2 instance running Windows Server 2008 R2

I have been searching for a while, but it seems like most people have same issue but in the other direction. Meaning that the can't seem to ping their Server. I am trying to use putty to access my machine from my Server on an Amazon EC2 Instance,…
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Unable to ping my Ubuntu AWS instance

I'm new to AWS, just setup a ubuntu ec2 and I've made a security group which allows me to ssh in and that's about all for now. What do I have to do to make it so I can also ping my instance?
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Ping one interface from the other

I have a computer (running Linux) with 2 interfaces eth0 and eth1. eth0 with address 10.0.0.100/24 eth1 with address 192.168.1.100/24 They are connected to 2 different networks (10.0.0.0/24 and 192.168.1.0/24), these networks are connected with a…
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Can't ping using IPv6 address

My network setup is very simple: two win7-64 machines connected to a switch. IPv6 enabled for their network interface. No router no outside network no DHCP. ipconfig report for the computer shows that they obtain a link local ipv6 address: machineA:…
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ping -R and traceroute mismatch

I am stuck at a very strange result after running the command ping -R in a unix environment. To be more specific, I am trying to follow the path to a server and back but there is quite a mismach between the results from running this command and the…
user726730
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Why is DownOrNot and JustPing reporting that my website is down?

I was pinging my site with DownOrNot and it is reporting that my website is down from all locations. Then I pinged it with JustPing and it is reporting that my website is also down from all locations. However, http://qweop.com definitely works fine…
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Configure static IPv6 on Ubuntu

I'm trying to configure IPv6 on a dedicated Ubuntu server. My provider gave me a "/64" (whatever that is - I'm still confused) of IPv6 addresses. However, when I try to use them, I can't ping anything. What do I do? :( # ping6 ipv6.google.com …
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What do the RTT numbers mean in a TraceRoute result?

I have this traceroute result, and I am wondering what EXACTLY do the 3 numbers mean at the end of each line? I assume they are ping times, but what exactly is the difference between each number? 1 L300.DLLSTX-VFTTP-49.verizon-gni.net…
djangofan
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How can I establish if a 566ms average response time is any good for my server?

One of my servers averages 566ms response time as measured by Pingdom ( pingdom.com ). Is this a good score? Should I be doing more to optimise it?
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Odd results from ping

When I run this on an Ubuntu box: sudo ping google.com -c 25 -l 25 I get about 1 line back every 2 seconds despite the fact that it should (if I'm reading things correctly) send out all 25 packets at the get go. Oddly enough it claims that I'm…
BCS
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Junior admin - how to discover/map the network to increase understanding?

I am a junior admin and have been tasked with gaining an understanding of the network. I know and use some of the servers on the network, so am able to tracert/ping them to see the names/addresses of equipment there are along the way, and gradually…
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Why slow (500-4500ms) ping times to google.com over Wi-Fi?

I regularly get ping times (to google.com) on my netbook over wireless (802.11) of: 500-4500ms for about half the time 100-150ms for the rest of the time. It seems to switch back and forth on the order of minutes. Regression: It doesn't seem to…
BCS
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Anyone know of a free flood ping utility for Windows?

Does anyone know of a free ping flood (some people call it flood ping) utility for Windows? I want something portable that I can install anywhere. I use ping flooding to primarily test for packet loss and jitter, and find the native tools on Windows…
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