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

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1answer
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I cannot ping my guest operating systems via Bridged Network Connection

Here are the details: I am using VMWare Workstation 9.0.1 build-894247. Host - Windows 7 - Firewall is turned on - has static IP Guest OS 1 - Windows Server 2008 R2 - Firewall is turned off - has ...
2
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2answers
788 views

Mellanox dual-port HCA, can ping if ib0 pair connected but not if only ib1 pair connected

I have installed 2 mellanox FDR dual-port ConnectX-3 HCA cards (CX354A), each to a separate machines. The machines are connected directly to each other (switchless configuration). Both ports on the ...
2
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1answer
171 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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3answers
3k 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 ...
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3answers
196 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. ...
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1answer
185 views

Can't ping6 a network interface from a different Ubuntu computer

I cannot ping6 the network interface "tun0" on the host computer from a virtual machine. Using vmware, I installed a Ubuntu 12.04 virtual machine, that is connected to the host machine with NAT. ...
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0answers
131 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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2answers
2k views

Fragmentation and packet size,using tcpdump

i am trying to understand concept of fragmentation: i have two virtual machines with public ip connected to a switch. tracepath shows packet not going through gateway from vm1: Trying to send ...
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2answers
154 views

How do know if I can SSH in servers?

I have over 200 servers, but is hard to keep tracking all of them by some documents, after a while it gets outdated, so to refresh this document, I have to know which servers I can login via SSH. I ...
0
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1answer
158 views

35 times increased latency between data send rate of 1 millisecond vs 100 microseconds. WHY?

Experiment hping -S --data 100 -c 100 10.56.1.2 -i u100 round-trip min/avg/max = 0.5/14.0/15.8 ms hping -S --data 100 -c 100 10.56.1.2 -i u1000 round-trip min/avg/max = 0.3/0.4/4.8 ms Observation: ...
0
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1answer
179 views

Hping showing -400% packet loss

I used the following command: sudo /usr/sbin/hping3 -q -n -c 5 -S <hostname> -p 8080 and the output I got is: 1 packets transmitted, 5 packets received, -400% packet loss Can you please ...
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0answers
726 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 ...
0
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1answer
39 views

Ping Interconnected PCs End-To-End

I have the following network topology: [PC 1] - - - [PC 2] - - - [PC 3] - - - [PC 4] Each machine is connected via a crossover cable. I can ping from PC 1 to PC 2, but how can I configure things so ...
0
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1answer
148 views

Can't establish connection between my VPS and itself

I have a VPS with two IP addresses: 74.117.158.92 and 74.117.159.204. If you ping them, you'll find they are both responding. I can also ping google.com etc. from either of them. But I cannot ping ...
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1answer
280 views

openvpn (tun0 + bridge) : Comunication bridge --> tun0 works but not the opposite direction

My network is composed as follows: Host A with ip 9.x.x.x and vpn ip 192.15.206.x (openvpn client) Host B with ip 9.x.x.x and vpn ip 192.15.206.1 (openvpn server) this host has a bridge br0 with ip ...
0
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1answer
155 views

debian clients connected to the same switch, ping problems

I have two machines that are connected to the same switch. Machines have multiple ethernet interfaces connected to the different networks. Computer A can ping an antenna which is connected to the same ...
3
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2answers
2k views

Linux ping command exits early due to ICMP host unreachable

An automated script runs shutdown -r now on a machine, and after a 30s delay, uses ping to determine when the machine is available. I've recently switched the OS from Centos 5 to Oracle Linux 6 and ...
0
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1answer
68 views

Linux server responds to postgresql querys and ssh only when pinging the server

I have a problem. My developers are using one of my local servers that is located in our office. The server is running PostgreSQL and when they try to make a query to it, it just lags and then gives ...
0
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1answer
98 views

Is it worth to set up a different network interface for connections to MySQL?

I have a high load website served by two servers: web server with nginx and php, and database server with mysql. Web server serves all the static content and connects to MySQL and outside world ...
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3answers
87 views

Reverse dns returns a different host each time

So, randomly I happened to ping abc.com and found this fascinating: $ ping abc.com PING abc.com (199.181.132.250) 56(84) bytes of data. 64 bytes from m.abc.com (199.181.132.250): icmp_req=1 ttl=237 ...
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1answer
105 views

Best practices on lowering latency between two endpoints [duplicate]

I would like to know what tools or what kind of calculation should be made in order to find the lower latency possible between two points physically distant. For example: Ping time from Europe to ...
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2answers
75 views

Will I get banned or blocked for running a diagnostic app?

This may seem like a simple question. Hopefully it will have a simple answer. I run an internet radio station. There are 3 machines. Music source client Stage server Master server (relays the ...
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0answers
188 views

How to interpret traceroute with success on some routes and failing on other similar routes?

I have traceroute paths from 3 unique source hosts, to a single destination host (173.254.24.18). The final results of these three routes are including similar elements, and yet the final failing ...
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2answers
118 views

Nmap scans the host but cannot ping the host [closed]

My laptop is connected to a network where we have routers with filters. I can use nmap to scan alive hosts and I can see open ports (mostly port 80). But then, when I try to ping those hosts, I dont ...
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1answer
200 views

IPv6: ping6 from foreign host works, but cannot ping6 on same host [ubuntu 12.04]

I have a strange issue with ipv6 on Ubuntu 12.04. There are two hosts, directly connected to the internet. Both have assigned a /64 network. They are properly configured with a /128 endpoint each and ...
0
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1answer
92 views

Ping sometimes resolves the name, sometimes not

Is this a normal behavior, that ping sometimes displays the server name, sometimes only the IP? OS: Ubuntu 12.10 ~# ping development.example.local PING development.example.local (192.168.0.25) ...
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1answer
568 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 ...
2
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2answers
453 views

arp packet received larger than packet sent, why?

I'm trying to debug a networking issue. During this process, I've noticed that when I try to do an arping, the received arp packets are larger than sent arp packets, as outputted by tcpdump. (Note ...
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2answers
138 views

ping and identify Cisco model without physical access or login?

There are several Cisco devices on my network which I can find with ping or nmap but I have no idea what the type (e.g. switches, routers) or specific model is. Is there some way to find this out ...
4
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1answer
222 views

tcpdump on interface when pinging nonexistent hosts on local network

I've statically configured the IP address of an interface on a server: ip addr add 10.40.0.6/16 broadcast 10.40.255.255 dev eth1 If I try to ping a machine on the network (e.g., 10.40.0.1), it ...
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2answers
200 views

Can ping google.com, but can't ping cnn.com

I have just upgraded from 10.04 to 12.04. I didn't notice the problem at first. But when installing horde with the pear installer it failed to download all of the packages. So I did a little hunting ...
2
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1answer
1k views

VirtualBox bridged adapter can ping but can't curl

There is a delicate server running Ubuntu Server 12.04.2. There are 4 useable IPs for this server: A, B, C, D. The server itself takes A. The server is now running two VirtualBox guests, both with ...
0
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1answer
131 views

Low Latency for Google compared to servers located with in my country [closed]

When i ping google.co.in its showing 11.1 ms as average ping www.google.co.in PING www.google.co.in (173.194.36.63) 56(84) bytes of data. 64 bytes from bom04s02-in-f31.1e100.net ...
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1answer
2k 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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0answers
68 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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votes
1answer
117 views

I can ping www server, but cannot ping domain name [closed]

for example, I can ping www.example.com, but cannot ping example.com. It reports: "Ping request could not find host example.com. please check the name and try again" (in DOS mode) How can I fix ...
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1answer
83 views

Ping measurements during throughput measurements

I have been measuring the throughput of file transfers from remote hosts and analysing the results, I understand about payload to overhead ratios, retransmission and other causational factors of ...
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1answer
567 views

ping -a does not return hostname [closed]

The problem i am currently experiencing is with One of my Untangle boxes. We are using IPsec VPN, Microsoft Server 2003 for DNS. I cannot get RDP to work with hostname, FQDN, ONLY IP. When i use ping ...
0
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2answers
123 views

I can't ping my server from certain IP

I have 2 internet connections from 2 different ISPs with static IPs, lets call them A and B. A connects to the server in several ways (ping, SSH, HTTP), while B cannot do anything (ping, SSH, HTTP). ...
0
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1answer
403 views

Reply times vary with ping test

I am seeing the following and I have already scanned all the computers for viruses and there were some but they have been removed. Would anyone have any other ideas on what tools or other things that ...
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0answers
83 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 ...
0
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2answers
3k views

How to monitor printer host status with zabbix

I need to monitor host status of printers from zabbix. I managed to monitor the inklevel via SNMP. Any ideas to monitor printer reachable or not ?
0
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1answer
86 views

Ping Elastic IP Address from Inside Server Fails

I have an EC2 server set up inside a VPC on Amazon. The server is reachable from the outside via its elastic ip address; however, when I attempt to ping that ip from inside the remote desktop ...
0
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1answer
55 views

Unable to reach Terminal Apps and Ping to VM server 2008

We have Domain Controller Group Policy Set to Disable Firewall on All computers within Domain, because we have Syamntec end point Protection enabled. The problem now is, since Windows Firewall is ...
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3answers
463 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
135 views

Pinging two machines (mac and a pc) from a wifi hotspot [closed]

I am in India and I use a device like this(Verizon mifi) to connect to internet(Indian version is called Tata photon WiFi hub), this device can connect upto 5 computers but the problem is that none of ...
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0answers
196 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 ...
0
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1answer
2k views

Can you ping a Cisco Router's Loopback Interface from a PC using PacketTracer

I may be misunderstanding what you can do with a Router's loopback interface. I am trying to ping it from a PC on the same network. I am using Packet Tracer to simulate this, a Cisco 1841 and a PC ...
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1answer
130 views

I am unable to ping two machines each other despite they are on same domain network

I am having two VM's equipped with 180 trial versions of Windows server 2008 R2 SP1. In one i have configured active directory domain services and ran dcpromo.exe on it and added the other server to ...
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1answer
93 views

Unable to connect to device across subnet

I have a network printer (Sharp copier) that I am unable to contact from a different subnet . I am on 192.168.100.x. The printer is on 192.168.200.x. I can ping (or remotely connect to) every other ...