Use the netstat -rs command to display routing statistics. You can use the resulting display to determine if your network is having routing problems. This is sample output:
routing:
0 bad routing redirects
0 dynamically created routes
0 new gateways due to redirects
489 destinations found unreachable
0 uses of a wildcard route
226 routes created by PMTU discovery
51 routes modified by PMTU discovery
226 routes discarded by PMTU discovery
If the output indicates
that bad routing redirects occurred
or that a number of destinations were found unreachable,
there are problems on your network.