When all you need is a simple network latency graphing tool, take a look at SmokePing. There are many open-source and free tools, but they tend to be overly complex and difficult to configure for small projects or simple graphing needs.
SmokePing is light-weight and comes preloaded with probes to graph http, dns, ssh, ping, tcp ports, and more.
I run SmokePing for both work and personal projects. At work we use it to graph latency between different sites and data centers. At 60 second intervals and 365 days of historical records, it is an excellent tool for trending or troubleshooting user issues. At home I use it to graph Internet response times to popular websites and their DNS servers. This information is used to validate my ISP works as expected and helps to correlate outages if there are problems.
Install SmokePing per their instructions or distribution package manager.
Configure devices to monitor by editing the
Targets file in the /etc/smokeping/config.d directory:
jemurray@home-server:/etc/smokeping/config.d$ cat Targets *** Targets *** probe = FPing menu = Top title = Murray Home Network Statistics remark = To view the network statistics, choose from one of the latency menu options in the column on the left. + network menu = Net latency title = Network latency (ICMP pings) ++ Google host = google.com ++ Spectrum host = rns01.charter.com ++ OpenDNS *** Targets *** probe = FPing menu = Top title = Murray Home Network Statistics remark = To view the network statistics, choose from one of the latency menu options in the column on the left. + network menu = Net latency title = Network latency (ICMP pings) ++ Google host = google.com ++ Spectrum host = rns01.charter.com host = resolver1.opendns.com ++ WashU host = anycast.ip.wustl.edu. ++ Amazon host = amazon.com ++ Master-Bedroom-Google host = 192.168.86.27 ++ home-router host = testwifi.here ++ Netflix host = netflix.com + services menu = Service latency title = Service latency (DNS, HTTP) ++ DNS probe = DNS menu = DNS latency title = Service latency (DNS) +++ Google host = dns.google +++ Spectrum host = rns01.charter.com +++ OpenDNS host = resolver1.opendns.com +++ WashU lookup = wustl.edu host = anycast.ip.wustl.edu. +++ CloudFlare host = one.one.one.one +++ home-router host = testwifi.here ++ HTTP menu = HTTP latency title = Service latency (HTTP) +++ Google host = google.com +++ OpenDNS host = opendns.com +++ WashU host = www.wustl.edu +++ Amazon host = amazon.com +++ home-router host = testwifi.here +++ Netflix host = netflix.com
Restart for the changes to take affect:
jemurray@home-server:/etc/smokeping/config.d$ sudo /etc/init.d/smokeping restart [sudo] password for jemurray: [ ok ] Restarting smokeping (via systemctl): smokeping.service.