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

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udp measuring packet time

i have to create simple tester for determining parameters like RTT, losing packet and order of received packets. Implementation should be similar to ping/traceroute command - using UDP communication: ...
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0answers
24 views

Different TTL value to 1 website from 2 computer in same network [on hold]

I have one laptop and one desktop on same network both of them using windows 7. I tried to ping to www.kit.edu and got different TTL value. from desktop the ttl value = 247 and from laptop the ttl ...
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0answers
50 views

Does a ping to 127.0.0.1 hit the network card? Which RFC / standard states that? [closed]

I recently did an exam where one of the questions stated that you can run ping 127.0.0.1 on a computer to verify if its network card is working. I have already read on multiple sources that this ...
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0answers
11 views

Ping is not working in cygwin [closed]

In my system cygwin64bit I'm using. Os is win 2008r2. When it is pinging, ping is not happening. When I try to ping from one more cygwin both are working fine. What might be the issue?
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2answers
43 views

Transatlantic Ping respond times [closed]

Not sure if this the the right place to ask the question. But has anyone had any experience with ping response times or knows of an good to average response time for transatlantic traffic? we have an ...
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1answer
27 views

How can the Windows 7 sees the Windows 2012? [closed]

I have installed a Windows 2012 Standard Server with Active Directory, DHCP and DNS server in Oracle Virtual Box. It has two Network Adapters (Ethernet and Ethernet 2). These Adapters are in same ...
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0answers
40 views

Can ping from PC to cisco router's ipv6 address (from LAN side) but can't ping from one pc to other's ipv6 address

PCs are connected to Cisco switch and up link goes to Cisco 1841 router on router LAN side interface f0/0 ip add: 2001:xx:xx:xx:1000::64/120. IPv6 is not enabled. I am not able to give prefix length ...
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2answers
478 views

Faster way to ping URL than curl [closed]

What would be the fastest way to check whether the specified URL is working? (responding in OK http status code)? For now I'm using curl, but I have bunch of URLs to test in a loop, so I'm looking ...
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3answers
2k views

Sonicwall NSA2400 - No internet access

We've got a SonicWall NSA2400 configured with a LAN (X0) and a WAN(X1) interface. It was setup and working fine until just recently when a temporary worker changed some settings most likely NAT. We ...
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4answers
933 views

NSLOOKUP and NBLOOKUP give one IP address; PING finds another

In a Windows Server 2008 domain the on-site domain controller serves as both DNS and WINS server. It is also a DHCP server. One workstation is used as a platform for all admin of the various servers ...
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1answer
13 views

Finding device network disconnection location (which hop failed) [closed]

If you can't connect to the internet and you know the problem is as simple as one of your devices being disconnected along the line which of the following would you use to find out which? You also ...
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4answers
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What is the difference between ping and tracert?

I basically know the difference in my head but I'm having trouble formulating it on paper. If someone could tell me a little more detailed explanation about the two I'd really appreciate it. So ...
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2answers
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Public hosts for ping

For my firewall scripts to determine whether my ISP is up I need a few reliable, geographically distributed addresses to ping. I could just use some major sites like Google, Akamai, etc. But that ...
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8answers
64k views

Is there any way to ARP ping on Windows?

On Linux and other systems, there is an utility called arping which can be used to send ARP requests ("pings") and show the answers, much like the "ping" utility but using ARP instead of ICMP. Is ...
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3answers
40 views

Web server is working, but ping returns a request timeout for icmp_seq [closed]

these are my current iptables settings: Chain INPUT (policy DROP) target prot opt source destination ACCEPT all -- anywhere anywhere state ...
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0answers
28 views

Find any/first alive host in subnet

I'm trying to find a quick way to check if there are ANY alive hosts in an IP range by pinging them. eg: i don't need to know what hosts are alive, just if one or more is responding to a ping. This ...
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0answers
38 views

Difference between ping time and time for first ACK answer

While creating a packet performance monitor I come across the follow problem: if I ping a server, I get about 4ms. If I calculate the time between a POST and its first ACK, I get about 25us ...
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2answers
2k views

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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3answers
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Why can't I ping my freshly set up amazon web service EC2 instance?

I was following this tut on how to set up a EC2 instance on Ubuntu but qhen trying to execute ssh command on my IP address, I had an operation Timeout. So I tried to ping it but no chance neither. ...
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1answer
61 views

ping -a not resolving hostname for one host on Windows 7 client

ping -a 192.168.99.3 does not resolve hostname for vcl.nailit.lab, but does for other hosts on network like pfsense.nailit.lab. nslookup vcl.nailit.lab and ping vcl.nailit.lab work correctly. See ...
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0answers
15 views

Automatically start machine if another fails

Is it possible to get a backup server (machine) to automatically start if the main server (machine) fails (i.e. does not longer respond to ping, or something). We're talking physical servers, not ...
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2answers
9k views

How to ping eth0 from eth1 on my linux machine?

I have a linux machine with 2 ethernet ports(eth0 and eth1). eth0 is connected to a router which assigns it an IP address 192.168.1.2. eth1 is connected to a switch which doesn't have an IP. How do I ...
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17answers
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Ping a Specific Port

Just a quick sanity check here. Can you ping a specific port of a machine, and if so, can you provide an example? I'm looking for something like ping ip address portNum.
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1answer
819 views

blocked.domain.gstatic.com - Where could this blocking be?

As of this morning we were having serious issues (partially loaded site with no functionality) accessing Google Drive which we use heavily. Other websites seemed to work fine. This is happening on ALL ...
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4answers
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Are network and broadcast IPs supposed to respond?

I have a /24 network that is subnetted into a bunch of small chunks. I have recently gone into each router on the network (mostly Cisco) in order to document how this network had been divided. Now ...
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Getting chunks of high ms when pinging local / external IP addresses?

I am having difficulty identifying what a specific problem with one of your vlaned networks. They have a voip phone which regularly cuts out during long phone calls. I have done several ping tests ...
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Can't ping hostname, but 'ping -a' resolves

I'm trying to ping a Windows PC through VPN by hostname. WINS is set up on all devices. I only get a reply from some PCs. On devices that can't be ping'd, I can do ping -a to resolve the hostname. For ...
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1answer
3k views

Server can't ping or connect to self

This SF Answer helped me after nerve's answer below: No network loopback device after security update ubuntu 12.04 Original Question I've been Google-ing and banging my head against the wall for a ...
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1answer
69 views

VPS can ping host by IP but not by name

My Debian VPS can ping all host by name and IP but there's one host I can't ping by name. Ping by name failed but successful with IP However on my home PC i can ping that host by name and IP. I ...
0
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1answer
78 views

Is it possible to offer failover even using DNS round robin? [closed]

A company X has five ips to a given service. $ host www.example.com.br www.example.com.br has address 13.194.4.159 www.example.com.br has address 13.194.4.152 www.example.com.br has address ...
0
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2answers
138 views

Fastest way to scan all hosts that are online

I am looking to find all the hosts that are online in a set of networks. I would like to find all hosts that are online in the entire network of 170.10.. (there are ~64K possible hosts). The network ...
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1answer
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First Reply on Ping is Unreachable the rest is okay [closed]

please check this weird ping i'm having What may have caused this problem
3
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1answer
265 views

ping: sendmsg: Operation not permitted (sometimes)

On a Ubuntu 14.04 running Haproxy, after a service haproxy reload, Haproxy is suddenly reporting all servers behind it as down. After some digging around, I noticed that ping is not working properly, ...
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2answers
484 views

Can browse, but can't ping

I am behind a corporate network. I am unable to use git, since it can't resolve server names fatal: Unable to look up someserver.org (port 9418) (No such host is known. ) I can't ping that server ...
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64 views

Destination host is unreachable

Points to Note I am installing cloudera 4.6.0 using docker in pseudo distributed mode. I have created two docker containers. One is for hadoop and another is for flume. I linked two containers as ...
2
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2answers
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Why Ping starts showing results only after a minute

I am running a Solaris 11 system over a local private network 192.168.100.0/24 and I run ping -s to get continuous ping. From the Gateway to my server I get root@mygateway:~# ping -s 192.168.100.42 ...
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2answers
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extreme ping latency in WDS network

I have setup a wireless network at work office with the following config: 192.168.1.1: TP-Link 941 Router, Root AP, connected to internet 192.168.1.2: TP-Link 901 AP, WDS Repeater, connected to ...
2
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1answer
321 views

Cannot ping to localhost into CentOS

I'm connecting to my server (Centos 7) with ssh and I try to ping to localhost: ping 127.0.0.1 but doesn't work: ping 127.0.0.1 PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data. ^C --- 127.0.0.1 ping ...
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2answers
688 views

Icinga change ping check interval from service and http

I have Icinga installed on a machine with the basic configuration and we just use the Host Status Detail screen with a big monitor only to know when a machine is down due to network/eletrical ...
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0answers
50 views

Bad ping results while testing 6000 TCP clients with 18 mbytes/s total traffic on Windows Web Server 2008

The clients are running on the machine #1. The server is installed on the machine #2. The machines have a gigabit connection through a switch on their private vlan. There are no errors in the switch ...
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2answers
104 views

TTL in ping vs dig

When I ran ping google.com, I get a ttl value of 55: 64 bytes from 173.194.127.103: icmp_seq=68 ttl=55 time=16.4 ms When I ran dig google.com @ns1.google.com., it get a TTL value of 300. ...
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0answers
1k views

Cannot Ping or Resolve DNS Internally; Externally works fine

I have an issue where I cannot seem to access a subdomain from within the same server: I can ping, nslookup, etc subdomian.domain.com externally, but from within the server where subdomain.domain.com ...
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6answers
28k views

Enable Ping in Windows Server Firewall?

I've just installed Windows Server 2008 on a server and I'm able to connect through Remote Desktop but can't ping. Do I need to open an special port on the firewall to be able to ping a server?
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0answers
80 views

What does ipg/ewma mean in an output of ping -f?

I pinged in a flood mode: # ping -c 1000000 -f 127.0.0.1 and I got the following output: PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data. --- 127.0.0.1 ping statistics --- 1000000 packets ...
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3answers
708 views

Linux command to wait for a SSH server to be up

I have a script which creates a virtual machine and gives me back an IP address. Then I would like to do something like this: waitforssh 192.168.2.38 && ssh 192.168.2.38 And it will wait ...
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7answers
25k views

How can I set a short timeout with the ping command?

I am trying to write a script that lists all the hosts on my LAN (there a about 20 of them) and writes the ping status next to each host. I have the DHCP leases file, so I have all the IPs (say, ...
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1answer
2k views

HP Procurve 2920 VLANs with DHCP cannot ping

I have problem setting up working VLANs and DHCP server on HP Procurve 2920. My problem is that I cannot even ping computers between VLANs with static ip addresees. winXP pc on VLAN101 with ...
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2answers
100 views

how to force linux to accept packet with loopback ip

i have an embedded system with an Ethernet interface that needs to accept external packets with IP of 127.x.x.xx. is there a way to force Linux to accept external packets with this loop back address ...
4
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1answer
156 views

DNS and PING failure - Windows 2003 DNS and SonicWall NSA240

I am hoping someone can shed some light on this one... I have two Windows 2003 DC's - both running DNS, there are several Windows 2008 R2 and one Windows 2012 Standard server running as member ...
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0answers
85 views

Oracle GNS (Grid Naming Service) Breaks DNS

Am running a 2-node Oracle 12.1.0.2.0 ASM Flex Cluster using Oracle GNS which I believe uses zeroconf to create it's adhoc network. Before GNS starts, DNS works, i.e. nslookup, dig, ping, ssh all ...