Business Support

IP routing symmetry/asymmetry

The two traceroutes below show an important function of routing; routing isn’t always symmetrical and, in the case of the Internet, it’s often asymmetrical.

Traceroute #2 shows traffic taking the top path from 10.10.10.2 towards 10.10.10.6:
SVL > SEA > MIN > OMH

Traceroute #3 shows traffic taking the bottom path from 10.10.10.6 towards 10.10.10.2:
OMH > TUL > PHX > SVL

Traceroutes #2 and #3
Click image to enlarge