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

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813 views

Ping not working from tap interface attached to bridge interface with ip on same subnet as that of bridge to outside

My requirement is to create a multiple tap interfaces, each with ip address on same subnet. I tried this by creating a bridge br0 (192.168.1.199) ...
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1answer
449 views

Server responds to pings but no SSH or HTTP access

I do not know what has caused this but my websites have been down for 2+ days now and I cannot connect via SSH or FTP either. The only way to get signs of life from my server is to reboot it via the ...
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1answer
103 views

Server's network capabilities are going into some sort of sleep mode?

I'm having trouble with a server (Windows Server 2008 R2) on my network. It is going down for short periods at a time, but not very often. The interesting thing: If I ping the server from my ...
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173 views

Continuous ping on proxy preventing https requests, why?

I hope someone can help me solve this mystery. I have a small linux box which is configured as a transparent proxy on my network. I'm trying to run a script at startup that does a continuous ping to ...
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39 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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147 views

Apache Instance in Private Subnet not returning packets

How can we get the Apache instance in a private subnet to work? Configuration Public subnet with 1 NAT instance Private subnet with 1 App instance Details 1. Masquerading is turned on NAT on via ...
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0answers
509 views

Time Capsule giving high ping times for wireless

We've just set up an Apple Time Capsule for our network, and while things run fine in wired mode, with wireless mode ping time fluctuates wildly from 0.5 to 400ms: Ping from a Macbook Pro to ...
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216 views

One server has multiple IP address leases but just one adapter and no dhcp reservations?

One of our servers' has multiple (10) DHCP Addressleases and I don't know why. The server itself has only one adapter and even if I execute ipconfig /all I only see one IP address defined. Even in the ...
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79 views

two different ping results to the same machine, what does this mean?

I am trying to track down a network or possibly server issue, and I opened a ping to the server from my machine. I will generally receive a <1ms response for a period of time, say 10+ minutes. ...
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796 views

Server 2012 intermittently fails to respond to pings from single host, even with firewall disabled, but responds to non-ICMP requests fine

This one is kind of weird. I've got the following machines involved: DC01 - 10.1.2.42, Server 2012, domain controller & DNS server, physical machine nagiosv - 10.1.2.35, CentOS 6.4, Nagios, ...
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178 views

openvpn setup ping/routing fail

My problem is that after setting up VPN on a virtual machine (Ubuntu Linux) with that has an IP I cant ping anyone at all over the tun interface from the client. VPN Connection is however successful. ...
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531 views

Cannot ping any machine on local network (embedded linux device)

I have an embedded linux installation (custom built using buildroot, uClibc and busybox) and I am unable to ping any machine on my local network. My /etc/network/interfaces file is as follows auto lo ...
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943 views

Arp request is not resolved

On my machine, I have assigned ip addresses for two interfaces which are connected through a cable. They are connected with 10G ports. When i tried to ping the two addresses, ping was not working. ...
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369 views

Clear OS Community and packet time out in client machines only

I am having Clear OS Community Edition running as router with 2 network interfaces. Interface eth0 is connected to LAN with ip 192.168.122.2 and interface eth0 with ip 192.168.2.2 is having internet ...
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2k views

Ping starts, then immediately fails, to just one device on a network of 70+ and only from one part of the network! Super confusing

long-time reader first-time poster. I managed a network of 70 odd PCs connected to 3x different network switches (3 buildings all next door to each other). Looks like this: BUILDING 1 SWITCH -> ...
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203 views

Windows 2003 VPN, client connected to server, but can only ping part of servers

My Windows 2003 server has an integrated ethernet card as well as a dlink card. Using "Configure your server wizard", I successfully created a VPN server. The server IP is : 192.168.123.1 and ...
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1k views

Calculating the round trip time for ping packets

I am currently practicing for my network & communications course and have managed to confuse myself slightly on a question about packet round trip time. I have made a start but am now a bit stuck! ...
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340 views

Why Does Ping's RTT Derive From The Echo Reply?

This is a follow up on Why Doesn't Ping Show RTT? I had a look at BSD, Linux and BusyBox ping implementations. All three share the feature that they calculate the round trip time by sending a ...
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2k views

Ping fail between two servers on same subnet when other devices on subnet can ping the servers just fine

I have two Dell servers running Server 2008 R2 Datacenter Service Pack 1 with Hyper-V. For some reason, these two servers cannot ping each other (nor can the VM's on each respective server ping VM's ...
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30 views

Ping RTTs vs UDP Ping Pong RTTs

Network Topology (wired): ServerA - 1Gb - Switch - 10Gb - Firewall - 10Gb - ServerB Pinging ServerB from ServerA shows round trip times (RTTs) of ~1.2 milliseconds. UDP packet 'ping pong' between ...
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14 views

Any tools that can detect if the machine is off similar to Softperfect Wi-Fi Guard?

We have an outage of electricity the other day and some machines (static IP) has been turned off. Because the machines are located in different places is very hard to know. It will be good to have a ...
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45 views

Can't ping ubuntu server after reboot. Where to look for possible problems?

After restarting my Ubuntu Server I can't ping it. My hosting (Herzner) allows to boot server with rescue system, so I can access file system and try to fix it. The questions is, where to look for ...
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69 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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32 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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16 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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74 views

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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58 views

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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79 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 ...
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53 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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87 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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93 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 ...
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79 views

How do I set up Munin to ping all devices in my LAN and alert me if anything is offline?

So I managed to set up Munin, which was tearful because it was my first encounter with Linux. But it now works and generates colorful little graphs. The real purpose of that exercise, however, was to ...
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94 views

What is causing this seemingly excessive ICMP traffic?

This seems to occur when I initiate a connection to an IP that I haven't previously before. Is this a botnet trying to say hi to his friends? As you can see I have an ip filter set in this image, ...
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102 views

Troubleshoot packet loss and slow transfers on some sites

I need some help troubleshooting a network problem. Home ISP says its the server's network to blame, and host says there's problem on ISP side. With little knowledge, its hard to see where the problem ...
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250 views

Can only ping certain IP's over VPN

I have 2 Draytek Vigor 2830's set up with a IPSec VPN between the two which is working. Yet I can only ping the router in HQ (10.0.0.9) & the IPCortex (10.0.0.2), the outline below might help. ...
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158 views

KVM : domain names are resolved, but cannot ping

I've found that in KVM, my networking is acting funny. Oddly (1) I can resolve external internet locations using nslookup or ping , but I cannot actually receive a ping back. (2) I cannot ping ...
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121 views

NewRelic Availability Monitoring of Third Party Service

Background NewRelic offers availability monitoring whereby you can specify a ping URL for an application and have NewRelic send HTTP GET requests to that URL and GREP the response for selected text, ...
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211 views

ASA 5540 v8.4(3) vpn to ASA 5505 v8.2(5), tunnel up but I cant ping from 5505 to IP on other side

I am having problems pinging from a 5505(remote) to IP 10.160.70.10 in the network behind the 5540(HQ side). 5505 inside IP: 10.56.0.1 Out: 71.43.109.226 5540 Inside: 10.1.0.8 out: 64.129.214.27 I ...
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50 views

Network setup issue with no connection between virtual machines

I have the following network setup: EDIT: NOTE: WARNING: In the above Windows1 should have the ip 192.168.137.1 The issue that i am having is that every machine can ping and connect to every other ...
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95 views

Which Log file to check for strange Ubuntu server behaviour (offline for 5minutes at random times)

I am having problems with my Ubuntu 10.04.4 LTS server. My monitor application claims it goes off every morning at about 4 AM for 5 to 10 minutes. I am not sure where to start the troubleshooting ...
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108 views

Trace Route, Slow Pings, timeouts on after server restore

I am getting bad ping times on my server, especially for large data requests. The stored procedure on the server runs at 1 second, while calling it through my web applicaiton takes 23+ seconds. This ...
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74 views

Windows servers on same gigabit lan switch, what might cause Windows 2008 R2 to have 50% longer ping times than Windows 2003 server?

After installing a brand new HP Proliant DL380e Gen8 running SBS 2011 (Windows 2008 R2 X64) I noticed a difference in response to ping requests on the wired ethernet local LAN, even before the ...
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695 views

pinging an unknown hosts from centos resolves

I am seeing very strange behavior with servers running CentOS 6.4 x64. If I run a ping on a host which clearly doesn't exist: ➜ ~ ping sdafsadfdsadfsasdfasdoi.com PING ...
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304 views

Connect Navicat to Linux server

Im trying to connect to my remote Linux CentOS server with Navicat. If I try to connect with the relevant details it just hangs with "connecting to ...." I've tried to ping the server (with the ...
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168 views

One way ping on an embedded Linux system

I'm facing a networking issue with an embedded Linux system in a private network. We have a network that consists of a few tens of servers connected through a switch with one of the servers acting as ...
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1k views

Unable to ping vmware-workstation guest from host

Using vmware-workstation 9 Host OS win8 x64 IPv4 address: 192.168.0.101 Guest OS winxp x86 IPv4 address: 192.168.0.106 The same thing happens with NAT and bridged for the guest vm. I am able to ...
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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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72 views

I have a very strange symptom in my network

I have a very strange symptom in my network, some times a ping to the remote computer doesn't work in the same subnet (same VLAN), for example: [Local Computer (IP:10.10.10.2/16)] --- ping ---> ...
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117 views

Can't see all servers through VPN

I set up routing and remote access on a customer's 2003 server. Everything works, I can connect no problem. There are two servers in the domain. One is a 2003 Small Business DomainServer, the other is ...
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56 views

ping -4 and ping -6 both connect, but ping doesn't

On a Windows 2008 R2 server I'm having a strange issue with dns. nslookup, ping -4, ping -6, tracert -4 and tracert -6 all work correctly and will resolve the correct IPs. But ping and tracert ...