What if traceroute packets are dropped
Traceroute shows asterisk whenever the timeout exceeded and no packet has been received.There are verious of reasons why packets are not received:
1) Router blocks ICMP
2) Router blocks UDP traffic (for linux version).
3) Noisy link with large Error Rate.
Simulation
Simulation shows three packets for each hope in the path. The drop rate(%) of the link is set to 10%. It means that there is 10% chance your packets will be drop. If you don't see any drops try to execute the command again. You can reset the timeout by clicking the 'Reset Timer' button in stand of waiting for the timeout to expire.
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