#Tcpping centos how to#
#Tcpping centos update#
#Tcpping centos Offline#

You can use a combination of arpping and icmp ping, or in fact tcp ping, to gather what the failure is. You may want to look at arp ping tool if all your hosts are on the physical LAN.It does the same thing but uses layer 2 arp packets to do the 'ping'.

#Tcpping centos update#

On Debian Lenny, installation is trivial: aptitude update I accepted the fping solution (thanks for all the other answers). This is why I do not want to scan all the subnet (with a ping -b for example). They are on the same vlan and subnet as the users (for simplicity of deployment and replacement).

The hosts I am trying to ping are actually access points.

Is there a way to set the timeout to a lower value? If not, are there any alternatives? I tried to set it to below a second, but it does not seem to take the parameter into account at all: ping -c 1 -W 0.1 10.0.0.1 # timeout option is ignored, apparently

#Tcpping centos Offline#

I think I'm interested in the latter.Д«ut waiting one second per offline host is still too long. I checked man ping, there seem to be two options to set the timeout delay: -w deadline and -W timeout. Unfortunately, when a host is offline, the ping takes a long time to timeout. So, my script launches a single ping for each host: ping -c 1 10.0.0.1 I have the DHCP leases file, so I have all the IPs (say, 10.0.0.1, 10.0.0.2, etc.), all I need is the ping status for each host. Indeed, iPerf gives you the option to set the window size, but if you try to set it to 3.1 or 8.I am trying to write a script that lists all the hosts on my LAN (there a about 20 of them) and writes the ping status next to each host. For a 50 ms latency, the window size needs to be 3.1 Mbytes. The obvious option would be to increase the window size to a larger value and get up to, letвЂ™s say, 500 Mbps. If itвЂ™s 64 KBytes, with a modest latency of 10 ms, the maximum bandwidth you can get is 52.43 Mbits/sec. The default window size that iPerf uses varies by machine type and operating system. The maximum achievable throughput is equal to:

#Tcpping centos how to#

But it can be trickyвЂ¦ How to calculate maximum achievable TCP throughput However, given your linkвЂ™s latency, you can adjust the TCP window size in order to achieve the desired bandwidth. You canвЂ™t bypass them unless you get new hardware. The interface and the CPU put hard limits on the maximum bandwidth you can achieve. Latency: the greater the latency between source and destination, the larger the TCP window size needs to be.CPU capabilities: pushing several Gbps of traffic needs quite a bit of CPU performance.Interface: if you are using a Raspberry Pi that has a 10/100 interface, then the upper limit is 100 Mbps.The maximum bandwidth that iPerf can push between a source and a destination depends on many factors.