I hadn't heard of the MTR tool before, but it appears to be similar to the pathping Windows utility I mentioned in my book. It combines the ping and traceroute commands to pound each router along the path to a destination, and measure min/max/average transit times at each hop in an attempt to find where latency and/or packet loss are being introduced in the network path, and also measure jitter. MTR doesn't seem to be included with Gaia 3.10, but similar to the strace utility I mentioned in my book, there is a precompiled copy of MTR you can download from here:
http://vault.centos.org/3.8/os/x86_64/RedHat/RPMS/mtr-0.52-2.x86_64.rpm
Not sure if you can make it work under Gaia, and be warned that adding additional software to the Gaia OS is not supported by Check Point.
"Max Capture: Know Your Packets" Video Series
now available at http://www.maxpowerfirewalls.com