Newest ping Questions

Q&A for system and network administrators

Cannot ping CentOs 6 vm on ProxMox

I'm new here and i have a fresh proxmox system and a CentOs6 vm and 2 ip's ... one for proxMox and one for centOs vm Working stuffs: ping to proxMox's ip ping from proxMox terminal ping from centOs ...

2 networks, but name resolution fully works only for one network

I have a Windows 2012 Server with DNS configured, on vmware workstation. Name Server is "ad.nuglab.local", with "Host (A)" record of 172.16.202.109 and 192.168.1.111 On my host PC, with dns server ...

VirtualHost resolvable from other machine, but not pingable

my VM has the IP 192.168.1.3, the DNS-Server has 192.168.1.2. In the /etc/hosts-file on the DNS-Server are the following entries 192.168.1.3 test.com 192.168.1.3 test.test.com From command nslookup ...

Get remote system time from ICMP timestamp

I read from an article that ICMP Timestamp can be used to determine system time so I tried hping3 192.168.1.x --icmp --icmp-ts -V. The output shows len=46 ip=192.168.1.x ttl=xx id=xxxx tos=0 iplen=40 ...

Testing Internet Up Status on Cisco ROUTER

QUESTION How can you tell if your Internet Carrier's Internet exit point is up? How can you tell if your carrier isn't having a problem downstream, even if your connection to them is up and up? You ...

packet rate with hping interval command

I am quite puzzled by hping command description. -i --interval wait (uX for X microseconds, for example -i u1000) --fast alias for -i u10000 (10 packets for second) --faster ...

Strange behavior of ping response [closed]

So we have an AWS Account with our DNS Servers running in it which resolve our on-prem instances. When i ping an on-prem server, this is the response i get back: ping myServer.example.com PING ...

Creating uptime monitor - Identifying network bottleneck [duplicate]

So I'm working on a website uptime monitor that should check thousands of websites per minute by doing a simple http call to them and checking the received status code. I've tested it using multiple ...

Can't Reach Server Via SSH / HTTP But Ping / Traceroute Works?

I've been struggling with a weird problem for the last several days. I have a virtual dedicated server with IP address 184.154.111.243. Some machines on my local network have lost the ability to ...

The arp-scan tool found machine but i can't ping [closed]

I have two VPS that i buyed from one corporation, OS of two VPS is ubuntu and when i ran arp-scan -l on one of the both machine and i can see IP of other machine, but i havn't any type of access to ...

Centos to Sonicwall Openswan VPN Tunnel UP but can't access Subnet behind Sonicwall

I'm trying to establish a VPN site-ti-site connection between a couple networks behind a Sonicwall 5600 and my Centos 6 Linux server. Using Openswan I have successfully created a VPN (ie there is a ...

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 (...

I am able to ping a device on a different subnet without passing through a L3 device. How?

I have two devices in the same broadcast domain. My PC and an Avaya IP Control Unit. My IP is 10.168.10.154/22. Avaya Device IP is 192.168.10.99/23. I am able to ping this device and don't ...

Domain controllers can't ping (or connect to) each other

First, some background: We have two sites connected via a FortiGate IPSEC VPN. They are each set up on different subnets - our main site is 192.168.2.x, and our second site is 192.168.0.x. We have a ...

Measure RTT for SSH

I'm trying to figure out a way to measure RTT for SSH connection, but my google-fu is too weak (perhaps I'm asking wrong questions?). Something akin to ping , for cases where SSH works, but ICMP does ...

Pinging my router in loop - Strange TTL? [on hold]

Can anyone explain me what happens? ping 192.168.1.1 -t Badanie 192.168.1.1 z 32 bajtami danych: Odpowiedź z 192.168.1.1: bajtów=32 czas=11ms TTL=111 Odpowiedź z 192.168.1.1: bajtów=32 czas=2ms TTL=...

nslookup, host, ssh connection works but ping not

I am connected to my server through SSH but it doesn't ping external address, it stuck when I try with: root@benchmark:~# ping google.com PING google.com (172.217.23.206) 56(84) bytes of data. ...

ICMP echos and replies arrive, but no ping (kvm hosts and guests)

This are the steps I took building my setup: I have 2 computers (both x86 running Ubuntu 14.04 LTS). I install 2 Virtual Machines (VMs) - one on each machine. Both VMs are Ubuntu Server 14.04 LTS. On ...

Check a machine's up or down status without using ping

I have a function that at the moment does a quick ping to a remote machine in the same network by doing so: ping -n 1 It then evaluates the commands success (1 or 0) in order to determine whether ...

pings ignored across VPN with Centos 7

I'm trying to setup a CentOS 7 DNS server in a VPN. I can't get devices from the VPN subnet (different subnet) to ping servers. I can get pings to work between servers (same subnet) When I run ...

Cannot ping DNS servers

I'm in abit of a situation, here is what I'm up against: So I have two server, on different subnets. Both servers can ping each other. Server one 10.0.1.* Server two 192.168.2.* Server one can ...

AWS ec2 instance with Pyramid is unreachable

I can't connect to the public IP assigned to my ec2 instance. I'm writing an api with Pyramid. I'm using the pserve development.ini command to start the server/run the project, which seems to be the ...

How to determine whether nameservers are working or not?

During waking up Vagrant VM I have some troubles with the network in one work space, and it works fine in another one. I'm trying to determine automatically DNS troubles (and fix it adding ...

Mac receiving ICMP requests but not sending any replies [migrated]

Why could my osx machine be receiving ICMP requests (that I'm sending), but not returning any replies? $ sudo tcpdump -nni any icmp tcpdump: data link type PKTAP tcpdump: verbose output suppressed, ...

Linux : Ping all the host in the subnet

There is one solaris command to ping all the hosts in the subnet by issuing : ping -s 255.255.255.255 Is there anything similar to this one in linux ? My intention is to find one mac address as ...

Can't get an nping response through an Alcatel modem - but can get ping

I am trying to use nping to ping 8.8.8.8 through an Alcatel W800 modem. I need nping because eventually I will need the ability to set some things like destination-mac. For now, I am just trying to ...

Duplicate Ping Responses from single AD Domain Controller

Something I can't wrap my head around is happening with a DC on our network. I am a programmer by trade not a network engineer, but I am 99% sure this is not normal behavior. Anyway when I rebooted ...

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 ...

ping a domainname in /etc/hosts

I am new in Linux. I want to test postfix. My Computer is a Mac G4 (AGP-Grafik, CPU 350 Mhz), running Debian Lenny. Gateway 192.168.2.1 The Gateway I need for the router. The router connects two ...

Should traceroute be used to diagnose network latency issues?

I ran the traceroute command from Server A to Server B, two of the hops display a latency between 250ms to 480ms. However when running ping from Server A to Server B, the response is always within ...

Linux returning single ping over IPSEC tunnel

I have a site to site IPSEC tunnel. Endpoint A is using a SonicWall firewall and has the local subnet of 192.168.1.0/24 Endpoint B is a Windows Server 2012 R2 box and has the subnet 172.16.34.0/24 I ...

Ubuntu 16.04 server is listening but not accepting incoming requests

I recently upgraded my server from Ubuntu 14.04 to 16.04. The upgrade seemed successful (so I'm not sure if it's related) but about a week in I restarted the host and it now will not accept remote ...

DNS A record seems to have propagated but ping still returns old IP

I have domain that is hosted by me. The DNS provider is dreamhost. I updated the IP address of the www.domain.com to x.x.x.200 from x.x.x.198, dnscheck show that changes have propagated correctly, but ...

Ping goes through shortest prefix

The setup I have a GW with an ipsec tunnel with a range of addresses 172.17.x.x on the other side, which is mounted on top of interface ens3. The GW is connected to a subnet with prefix 172.17.3.x (...

Why would ping oscillate between receiving bytes and redirects over a VPN?

I have a VPN set up between an Ubuntu 14 VM under fusion on my side and a SonicWall on the other side. The Ubuntu VM is dedicated to the task. When I ping a remote address, the results are very ...

Missing or skipped ICMP_Seq In AIX Ping

I noticed an intermittent slow response on the ping from my application server to my database server. So to diagnose, I tested using a standard ping and Telnet tests. For the telnet tests, it was ...

Hyper-V Virtual Machine - DNS resolve Slow?

I am running a Hyper-V server (Windows server 2012) (dedicated machine) for multiple subsystems that are virtual-machines. (3x Windows, 1x Linux) In general all works well except one small issue. ...

firewalld - how to block ping ICMP packets?

I can't seem to block ping requests to my server. I also followed the following post: Block ICMP timestamp & timestamp reply with firewalld # firewall-cmd --zone=public --list-all public target:...

Curl is working but ping is not working when specify an interface

Running on Fedora 25 in a virtualBox, I attached 2 network cards with NAT configuration. I can see both interfaces and routes are automatically created by the system: $ ip route default via 10.0.2.2 ...

One particular dedicated server can't ping one particular IP on on a VM and vice versa

I've 3 dedicated servers. 2 of them are running multiple VMs. VMs are all using multiple IPs from different countries. When the other dedicated tries to contact a particular VM using one ip, the ...

Linux\QNX firewall rules

I have a device running Linux/QNX and it does not seem to use standard firewall commands to configure it. It blocks SSH and PINGs from other networks. I would like to open the firewall to allow all ...

Is there a utility or way to get the PMTU/MTU of a remote system quickly?

Is there a utility or linux built in to get the PMTU/MTU of a remote system quickly (sub 1 second preferably)? If so what is it and what syntax does it require? Google searches have not been my ...

Looking for new network endpoint for monitoring

Good afternoon, all! I'm looking for a new static, highly reliable endpoint to ping as a network connectivity monitor. We had been using Google's DNS server address, but we just had trouble with it ...

Hyper-V: Not able to ping my local VM from Host

I have an external ethernet switch which I'm using to connect to my VM. I'm able to access internet on my local VM. The problem is that I'm not able to ping it. I've done the following after reading ...

Slave smokeping on xen VM shows substantial packet loss

I am using a Xen VM instance as a smokeping host. Recently I added a second XEN VM (on different iron, about 200 Km away) with smokeping in slave configuration. This is - again - a Xen VM, with a ...

ESXi 5.5 Windows Server 2008 Std VM - Unable to ping other hosts on same subnet

I am in the position of trying to set up a server system for my company using some provided instructions. I am not an IT professional, but am the only option available at the moment. So, I apologise ...

Traceroute time is too long

I m using RHEL 6.5 and eth0 interaface Interface Ip is 100.x.x.x and when i traceroute to 100.x.x.x it showing one hop that too ip address of interface itself. For eg traceroute to 100.65.111.14 ...

Windows Server 2012 router to router PPTP vpn connection ping failed after a certain period

I have two windows 2012 servers which are setted up with a router to router VPN connection using PPTP. It appears working properly after successful connection,which means both servers can smoothly ...

Unable to ping domain name without FQDN

The domain name consists of numbers only, example 300010100. If I try pinging the name only without FQDN, it responds back with a very odd IP address, 0.154.29.62 and giving transmit failed errors. If ...

Ping through VPN does not work?

I have a site to site VPN from one linux machine to another linux machine Machine 1 : LAN 1: 10.0.0.254/24 Machine 2: Static routes to network: 166.83.0.0/16 There is a IPSec site to site VPN ...
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