Questions tagged [ping]

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

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Ghost ping on a multi-NIC Linux system

I have a Linux system with 3 NICs & all 3 are on the same subnet. I've setup policy routing on the system with ip rules & ip routes using 3 tables. These are the IPs of the 3 NICs. ETH0: 192....
Sunny Yates's user avatar
25 votes
7 answers
59k 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?
holiveira's user avatar
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107 votes
14 answers
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Is Ping a reliable way to check if a server is available?

In my application I am pinging a server and waiting for a response. I am using this to determine whether the server is available and responsive or not. Is this a reliable way of determining ...
Peter Kelly's user avatar
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11 votes
2 answers
37k views

How can I know when my computer is pinged?

I am trying to find a problem on a local network. I want to be able to know when a specific computer (Windows XP) is pinged. Thanks!
cenanozen's user avatar
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9 votes
5 answers
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Ping replacement that shows real time

Is there a ping replacement that will display the system's date/time in addition to the round trip time and sequence number? I would prefer a tool that runs on Linux, but if there is a cli tool I can ...
Zoredache's user avatar
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9 votes
3 answers
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Why do tracert latencies not add up to ping latency?

One might expect the sum of the tracert latencies to equal 267ms:
pulsar's user avatar
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9 votes
4 answers
74k views

DNS can't resolve hostname; nslookup can

I have a user on Windows 7 that is trying to access a local server with a DNS name of windows.cs. We have two internal DNS servers. The DHCP server assigns users the two internal DNS servers as ...
Safado's user avatar
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9 votes
2 answers
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Cannot ping over LAN until a ping is received

I have two OSX machines on a local subnet. Pings from Machine A to Machine B consistently timeout until Machine B pings Machine A. After B pings A, A can successfully ping B, but this success is ...
ericsoco's user avatar
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5 votes
2 answers
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openvpn: connection established, can't ping server tun interface (debian server, windows & os x clients)

My goal: I want to set up openVPN on a vServer from the company netcup, running Debian squeeze. I only want a VPN connection from client to server; clients should not be able to see each other, also ...
hreimer's user avatar
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2 answers
3k views

ip routing for extra eni on RHEL ec2 instances

I have noticed that when one add an additional ENI on an ec2, getting routing to work is so difficult and there is no documentation anywhere to refer to. I do know that if one uses the Amazon Linux ...
uberrebu's user avatar
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2 answers
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Monitor status of VPN clients

Is there any better solution than ping -t for monitor status of some VPN clients. I have set up FreeBSD router with fix public IP address for accepting incoming PPTP VPN connections. The callers are ...
adopilot's user avatar
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Can't ping or remote desktop?

I've setup a win7 laptop and joined a company domain, now I'm unable to ping or remote into the machine. Could someone provide me with some troubleshooting tips please?
a1205189's user avatar
66 votes
18 answers
101k views

How to ping in linux until host is known?

How can I ping a certain address and when found, stop pinging. I want to use it in a bash script, so when the host is starting up, the script keeps on pinging and from the moment the host is ...
Sander Versluys's user avatar
58 votes
4 answers
59k views

What does mdev mean in ping(8)?

What does mdev mean in ping output (last row below)? me@callisto ~ % ping -c 1 example.org PING example.org (192.0.43.10) 56(84) bytes of data. 64 bytes from 43-10.any.icann.org (192.0.43.10): ...
Daniel's user avatar
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41 votes
5 answers
141k views

Why do we ping the IP 4.2.2.2 to test connectivity?

For as long as I can remember, I've always used the IP 4.2.2.2 when testing network connectivity using ping. What is significant about this IP, and when did this practice start?
gnavi's user avatar
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38 votes
3 answers
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Data obtained from ping: is it round trip or one way?

I have 2 servers, each in two separate locations. I need to host an application on one, and the database server on the other. From the app server, if I ping the database server, on average I get ...
Phil's user avatar
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36 votes
3 answers
173k views

How to Ping explicitly from eth1 instead of eth0

I'm trying to execute a ping with eth1, but the program uses eth0(the default network device). Any tips, tricks, or alternate techniques available?
user185814's user avatar
25 votes
5 answers
86k views

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. ...
Miles M.'s user avatar
  • 381
24 votes
16 answers
102k views

How can I determine if a machine is online without using ping?

I used to use an application that could ping or maybe run a port scan on a machine even if the machine was configured to not allow it. I am currently trying to ping a remote machine on our WAN, but I ...
cop1152's user avatar
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16 votes
2 answers
69k views

how to know who ping my computer ? [duplicate]

Possible Duplicate: How can I know when my computer is pinged? I'm using Linux. I would like to know how to tell who is pinging my computer. I have seen this similar question using Windows, but ...
Raja G's user avatar
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16 votes
6 answers
37k views

Network latency: 100Mbit vs. 1Gbit

I have a webserver with a current connection of 100Mbit and my provider offers an upgrade to 1Gbit. I understand that this refers to throughput but the larger the packets, the faster they can be ...
Andreas Richter's user avatar
10 votes
2 answers
17k views

Why can't I ssh or ping my brand new Amazon EC2 instance?

I just created a free EC2 instance with all the defaults. It says it's running in the AWS Management Console. On the "Instance Actions" menu, I click "Connect". I copy the DNS name provided (looks ...
CrazyPyro's user avatar
  • 351
9 votes
4 answers
25k views

Change how Nagios determines if server is offline?

I'm new to nagios and my server is on a network which does not allow the server to be pinged. Is it possible for me to check if the server is up another way? e.g via SSH or HTTP? How would I do this ...
Ulkmun's user avatar
  • 275
8 votes
1 answer
15k views

IPv6: Can't ping anything - "Operation not permitted"

I've been working on getting IPv6 support into my network, and had everything working properly for a short while. The server is running Ubuntu Server 8.10. Now however whenever I attempt to do ...
Matthew Iselin's user avatar
7 votes
2 answers
29k views

ping fails but ssh succeeds

I'm facing a situation where one app(using ssh) can connect from Machine A (Linux) to Machine B (windows), whereas Machine A cannot ping Machine B. Another app on Machine A which connects to Machine B ...
StuckAgain's user avatar
5 votes
6 answers
14k views

Intermittent high ping/latency problem

I have been working with my ISP (which is a WISP, actually Fixed Broadband Wireless) trying to figure out why I intermittently get high latency. The latency is detectable in online games and other ...
Hugh Jeffner's user avatar
5 votes
4 answers
18k views

Ethernet Loopback plug - running a ping

For a project at work, I need to be able to test various Ethernet NICs by connecting them to a "loopback adapter plug", like this one on various embedded Linux boxen that come off a production ...
J. Polfer's user avatar
  • 579
5 votes
2 answers
28k views

Can't ping host from vmware guest using bridged networking

Host is Windows 7 Guest is Ubuntu 11.04 Network adapter is wireless I can ping other computers on the network but not the host. No firewall are involved. Sniffing the traffic with wireshark it ...
user199421's user avatar
5 votes
2 answers
13k views

Pings from VPN network to VPN client work; pings into from VPN client to VPN network fail - why?

We are in the process of setting up an OpenVPN server for some servers running in a cloud. We are stumped with a connectivity problem whereby the hosts on the VPN server's LAN can ping te VPN client, ...
jonseymour's user avatar
3 votes
3 answers
793 views

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....
Pacerier's user avatar
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3 votes
3 answers
17k views

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....
rdrmntn's user avatar
  • 153
3 votes
2 answers
2k views

Can Only SSH After Ping

I have a virtual machine running RHEL 6, which I can only access after ping. [user@localhost ~]$ ssh remotehost Connection timed out. [user@localhost ~]$ ping remotehost PING remotehost.example.com (...
Frederico Martins's user avatar
2 votes
2 answers
185 views

Can you control the host information returned by ping?

I see that pinging my domain returns "n bytes from xyz.members.linode.com", which gives away too much for my taste. On the other hand, I've pinged plenty of domains that just return "something.domain....
ezequiel-garzon's user avatar
2 votes
1 answer
952 views

Interpreting PING Results

I am on Windows and LAN using the command line PING in this format: ping -a -n 5 -S <source ip> <destination ip> For the most part, it does what it is supposed to do but I have noticed 3 ...
GµårÐïåñ's user avatar
2 votes
3 answers
17k views

nslookup fails but ping succeeds for nonexistent domains

I have two different FreeBSD servers (different hosting companies), both exhibit this same behavior: They pick a specific IP address (216.239.120.238) for every domain that does NOT exist. nslookup ...
JimB's user avatar
  • 197
2 votes
3 answers
8k views

Server won't respond to ping

I have a server that won't respond to pings, but I can remote desktop to it. The server has two LAN connections. Each has the same subnet mask and default gateway, but separate IP addresses. I'm ...
user avatar
2 votes
1 answer
2k views

Xen machine can see others on subnet but not gateway

EDIT: solved it appears that switching static MAC definitions combined with mapping vif/0 and vif/0 statically to eth0 and eth1 (in domU, as per http://tomclegg.net/xen-eth0-renamed) done it. I'm ...
Karolis T.'s user avatar
  • 2,749
2 votes
1 answer
463 views

Maximum MTU size

Thought one of the issues I'm experiencing with the following question is due to MTU rightfully so. ESXi 5 VM Putty session hangs, vSphere client timing out However, when I tried testing the ...
user192702's user avatar
2 votes
0 answers
413 views

Can't ping remote host through nat on ipsec enc0 (mtu=0)

I'm up ipsec vpn to remote host. Since the remote host accepts only one ip i'm up nat for local net on enc0. Ping from ipsec host is ok: PING 172.20.162.150 (172.20.162.150): 56 data bytes 64 bytes ...
Morry's user avatar
  • 21
2 votes
3 answers
10k views

Can't ping from Machine A to Machine B on the same VLAN

Switch: Netgear 7352PS Created a VLAN (id = 10), and assigned ports 13 through 24 to that vlan. Also configured PVID as 10 for all these ports. Machine A: 172.31.192.111/24 Machine B: 172.31.192.110/...
RainDoctor's user avatar
  • 4,504
2 votes
0 answers
1k views

802.1q VLAN echo replies do not include VLAN ID

I am running a SLES11, SP4 kernel on 2 systems. I have 2 NICs connected through a Netgear GS724T switch. I have configured VLAN 400 on the switch. On system 1, I create a VLAN 400 on eth0 called ...
jetson23's user avatar
1 vote
4 answers
6k views

Why am I getting different results from two servers that located in the same destination network?

There's two servers with the same network IP, and the only difference between them is the last two numbers like: 37.211.15.247 and 37.211.166.178. The Hosting Provider claims that the subnet mask for ...
John Hark's user avatar
1 vote
1 answer
3k views

Why Doesn't Ping Show RTT?

I'm on OS X 10.7 and just found out, the ping -s 10 host does not work as expected. Its output does not contain the round trip time: PING host (IP): 10 data bytes 18 bytes from IP: icmp_seq=0 ttl=...
bot47's user avatar
  • 327
1 vote
0 answers
771 views

The difference between ping and pathping command? [duplicate]

Possible Duplicate: The difference between ping and pathping command? Hi guys, today i wanna ask you a question about internet network command. pathping = tracert+ping, so what is the difference ...
Fri13th's user avatar
  • 111
1 vote
2 answers
4k views

why does tracert only report one hop on failure

I've been having an issue with one host on my network not being able to ping or tracert machines on the internet while all other hosts can. When I run a tracert from the machine I get the following ...
radman's user avatar
  • 1,701
1 vote
3 answers
2k views

Gateway status checking methods on linux/bsd [closed]

I'd like to know if there's any reliable tools I could use (integrate with my network config) to monitor the status of the gateway and switch the default gw when it detects that the main gateway is ...
Karolis T.'s user avatar
  • 2,749
0 votes
1 answer
235 views

Find LAN's IPv6 multicast address (or else all currently responsive LAN members)

Is there a way to see which devices (IP numbers) are active on the LAN over IPv6? With IPv4 I'd ping the broadcast address, which is usually not hard to determine. With IPv6 I understand there are no ...
RJVB's user avatar
  • 111
0 votes
3 answers
12k views

Linux ping command getting rtt

I am new to Linux and i am trying to ping a server and i wonder How to get or calculate median of Round Trip Time (RTT) n Linux ? Ping or Packet Internet Groper is a network administration utility ...
USER's user avatar
  • 63
0 votes
1 answer
1k views

Cisco ASA failover can't ping gateway

I'm currently trying to set up a failover network for my Cisco ASA 55x0 using the SLA traking. I have the "outside" interface (network 89.x.x.48/29) and the "outside2" interface (network 192.168.70.0/...
Alberto's user avatar
  • 101
0 votes
5 answers
5k 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 ...
user2161082's user avatar