0
votes
0answers
44 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, ...
0
votes
0answers
28 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 ...
1
vote
0answers
39 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, ...
-7
votes
1answer
50 views

Is there a dedicated server that is legal to ping frequently with a massive number of devices?

I have thousands of devices and all of them need to have some kind of communication pass through them every couple of seconds to stay active. Pinging is sufficient for keeping the devices active. Are ...
2
votes
0answers
137 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) ...
0
votes
0answers
54 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 ...
2
votes
1answer
69 views

Any way to increase the libvirt guest network response time?

We are running a number of Debian Wheezy VMs on top of Ubuntu Servers 12.04.4 / Libvirt 0.9.8-2ubuntu17.17 The host is connected to the network through a trunk. It then split the VLANs and create a ...
0
votes
2answers
79 views

IPv6 address not available from outside

Since Hetzner pretty much doesn't give out any IPv4 addresses, no matter what the reason is, I decided to give IPv6 a try. These is the assigned IP address subnet mask IPs: 2a01:4f8:190:5112:: /64 ...
-4
votes
2answers
47 views

How to manage PING replies? [closed]

How can I manage, for example, my Ubuntu mashine so it doesn't (or does) respond to PING(ICMP ECHO_REQUEST - type 8) requests? Normally almost all computers in a LAN network responds to ping with an ...
1
vote
2answers
153 views

what does `pipe <number>` mean in `ping` output?

While running a test to diagnose some alleged network problem, I got this output from ping: --- r01c01b11n02 ping statistics --- 30000 packets transmitted, 29995 received, 0% packet loss, time 6309ms ...
1
vote
1answer
156 views

“Destination Host Unreachable” and ARP returns no addresses over LAN

I am currently trying to setup LAN over two machines with a network mask of 255.255.255.0 however I am receiving the following message when trying to communicate between them both; [root@alpha ~]# ...
0
votes
0answers
36 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 ...
0
votes
1answer
167 views

Windows 2012 R2 Server network fails intermittently

I have 2 windows 2012 R2 servers in a production environment. Both are VM's and configured same with the ip address as different. I haven't recieved alert of any kind of network failure for one ...
4
votes
2answers
297 views

Why do tracert latencies not add up to ping latency?

One might expect the sum of the tracert latencies to equal 267ms:
5
votes
2answers
134 views

Why nslookup doesn't use mdns while ping do?

In dnsmasq.conf: address=/local/127.0.0.1 In resolv.conf: # Generated by NetworkManager domain example.com search example.com nameserver 127.0.0.1 nameserver 10.66.127.17 nameserver 10.68.5.26 I ...
3
votes
1answer
217 views

How to ping ipv6 interface

I'm trying to get familiar with ipv6 I don't understand why I can't ping this interface at the inet6 addr eth1 Link encap:Ethernet HWaddr 08:00:27:77:9e:77 inet addr:192.168.33.10 ...
0
votes
2answers
92 views

packet loss between two specific VMs

I am experiencing some high-percentage packet loss (more than 70%) between two specific VMs in a local network, in a remote cluster (I have no physical access to it). One machine is used as a hadoop ...
0
votes
1answer
101 views

Why would I get different ping times directly to 10.0.1.1 versus pinging google.com with TTL 1? [closed]

Using mtr to gather some statistics, if I run sudo mtr 10.0.1.1 to ping my router, it looks terrible: My traceroute [v0.85] Johns-MacBook-Air.local (0.0.0.0) ...
0
votes
1answer
399 views

Linux network namespaces - ping fails on specific veth

I just started to exploring network namespaces. I try to implement the following simple setting following the article in http://www.opencloudblog.com/?p=42 +--------+ ...
1
vote
1answer
90 views

2 servers with 2 ip adresses cant ping each other

I rent 2 root servers from my provider that run Ubuntu 12.04.01 LTS. I ordered a second ip for each of them and configure them in /etc/network/interfaces as follows: iface eth0:1 inet static ...
0
votes
1answer
419 views

Setup machines network in Windows Azure

I'm building a web application and I've decided to host it on Windows Azure. My application has three components: A front-end created with Play Framework (machine A) A back-end core written in Java ...
0
votes
0answers
57 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 ...
0
votes
2answers
103 views

If a server is performing slowly, will ping still appear normal?

I'm trying to troubleshoot an intermittent slow application problem without direct access to the network. There is a server on one network providing webpages to a VLAN on a different network via a ...
1
vote
1answer
100 views

Ping time jumps from 0.9ms to between 11 and 28ms

I have a server with 5 other devices all plugged into a single switch. I can ping all devices with nice low ping times (between 0.6ms and 0.9ms). But, all of a sudden, the ping time to one of the ...
0
votes
1answer
66 views

Router Behavior for MAC Address Change for same IP

+-----------+ +------------+ +---------+ | LAN |eth0 lan0| Router |wan eth0| | | PC |===========| |===========| WAN-PC | | | ...
2
votes
1answer
187 views

Hosted Network Latency

Background I have a new hosted, dedicated database server behind a dedicated firewall (Cisco ASA 5505 Sec+). The plan is to have a virtual (aka "cloud") web server or two on the other side of the ...
2
votes
1answer
119 views

How light is a ping?

Hopefully this question isn't too dumb. I'm wondering how expensive (system resource, and bandwidth wise) a ping is. If I have a small embedded linux device that has very limited ram, cpu, and ...
1
vote
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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
votes
1answer
154 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 ...
0
votes
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 ...
2
votes
2answers
452 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 ...
4
votes
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 ...
2
votes
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
votes
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 ...
0
votes
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 ...
1
vote
0answers
192 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 ...
1
vote
1answer
91 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 ...
0
votes
0answers
52 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 ...
0
votes
3answers
782 views

Cannot ping from a bridged inteface

I am trying to bridge between eth2 and br0 from ubuntu 11.04 within virtual box. There is network bridging to host physical machine. From the guest OS after bridging I can ping from br0 but ...
0
votes
2answers
117 views

Why I can ping “anything” and I get a response, instead of getting “Unknown Host” [closed]

I can ping any word or domain in CentOS 6 and I get response from the same IP, if that pinged domain doesn't exist in real world. e.g. ping xxxxxx How can I fix this? I want to have normal behavior ...
0
votes
2answers
426 views

Can ping out but not in

What are some of the causes of not being able to ping a server? I have a windows 2003 box that I can remote into but I cannot ping it. What I have checked is: The server can ping my desktop ...
3
votes
3answers
323 views

Ping hostname returns another hostname in output : what does it mean?

When I ping the server sip3.voip-centrex.net, I get this output: PING sip3.voip-centrex.net (194.98.81.144) 56(84) bytes of data. 64 bytes from mpfrrelay.michaelpage.fr (194.98.81.144): icmp_req=1 ...
4
votes
7answers
843 views

Scan for connected, powered on computers on a network?

I want to scan for powered on computers on my LAN and gather logs about that. I tried nmap but it didn't work very well (a lot of switched on computers are not getting detected). nmap -sP ...
2
votes
2answers
2k views

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 ...
-2
votes
1answer
1k views

Cannot ping Windows 2008 R2 by hostname

I cannot ping the Windows 2008 R2 server by hostname from Windows XP Home machines, but I can ping it from Windows 7 Ultimate machines. I already disabled ipv6. I need to access a shared folder: ...
-1
votes
1answer
1k views

2 router network setup. Why does ping only work in one direction?

So the setup looks like this: There is a main WLAN-router/modem which is connected to the internet and serves the lower floor with WLAN. Now upstairs I have a second WLAN-router/modem (I will call it ...
2
votes
2answers
173 views

Server can be pinged from one server but not from other?

I have set up a Linux server in DMZ. There is another Windows server running in DMZ. These two servers can be pinged via internet using my home PC. However, the another Linux server rented from a ...