# How to install tcpping on Linux
A common way to measure network latency to a remote host is by using utility which uses ICMP echo request and reply packets. In some cases, however, ICMP traffic is blocked by firewalls, which renders utility useless with hosts behind restrictive firewalls. In such case, you will need to rely on layer-3 measurement tools that use TCP/UDP packets since these layer-3 packets are more likely to bypass common firewall rules.
One such layer-3 measurement tool is . To measure latency, takes advantage of so-called half-open connection technique, based on TCP three-way handshake. That is, it sends a TCP SYN packet to a remote host on a port number (80 by default). If the remote host is listening on the port, it will respond with TCP ACK packet. Otherwise, it will respond with TCP RST packet. Either way, can measure round-trip-time (RTT) delay of a remote host, by timing outgoing SYN packet and incoming ACK (or RST) packet.
The same half-open connection technique is already implemented by tool. So simply relies on to perform latency measurement.
In order to install on Linux, you first need to install , and then download script from the web.
To install tcptraceroute on Debian/Ubuntu:
To install tcptraceroute on CentOS/REHL, first set up RepoForge on your system, and then:
Finally, download from the web.
To measure network latency by using , simply run it as follows.
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