I can see the same issue on 12.04-1. It seems mtr 0.80(included in precise 12.04) and also 0.82(included in 12.10) are having this bug. Running the mtr without report switch won't show lost packets. So it seems some bug in the reporting code. sven@Ubuntu1204-1:~$ mtr -nrc 2 webmail.optuszoo.com.au HOST: Ubuntu1204-1 Loss% Snt Last Avg Best Wrst StDev 1.|-- 192.168.178.1 0.0% 2 0.7 0.9 0.7 1.1 0.2 2.|-- 62.214.64.79 0.0% 2 39.5 39.6 39.5 39.7 0.2 3.|-- 62.214.109.13 0.0% 2 41.3 41.1 40.8 41.3 0.4 4.|-- 62.214.110.245 0.0% 2 39.6 39.9 39.6 40.2 0.4 5.|-- 62.214.110.241 0.0% 2 41.0 40.9 40.8 41.0 0.1 6.|-- 62.214.111.29 0.0% 2 39.8 40.4 39.8 41.1 0.9 7.|-- 62.214.110.237 0.0% 2 113.4 77.1 40.7 113.4 51.4 8.|-- 149.6.138.205 0.0% 2 45.7 43.0 40.3 45.7 3.9 9.|-- 130.117.0.121 0.0% 2 43.0 43.9 43.0 44.8 1.3 10.|-- 154.54.37.114 0.0% 2 54.2 54.6 54.2 55.1 0.6 11.|-- 154.54.44.209 0.0% 2 124.6 124.9 124.6 125.3 0.5 12.|-- 154.54.44.102 0.0% 2 132.4 131.5 130.6 132.4 1.3 13.|-- 154.54.6.154 0.0% 2 146.9 146.0 145.1 146.9 1.3 14.|-- 154.54.84.73 0.0% 2 158.7 158.4 158.1 158.7 0.4 15.|-- 154.54.45.66 0.0% 2 196.4 196.2 196.1 196.4 0.2 16.|-- 154.54.7.174 0.0% 2 195.3 195.4 195.3 195.5 0.2 17.|-- 154.54.10.170 0.0% 2 195.6 195.3 194.9 195.6 0.6 18.|-- 203.208.148.82 50.0% 2 345.0 345.0 345.0 345.0 0.0 19.|-- ??? 100.0 2 0.0 0.0 0.0 0.0 0.0 20.|-- 210.49.105.6 50.0% 2 343.7 343.7 343.7 343.7 0.0 21.|-- 211.29.129.38 50.0% 2 348.0 348.0 348.0 348.0 0.0 22.|-- 211.29.129.213 50.0% 2 344.6 344.6 344.6 344.6 0.0 23.|-- 211.29.129.202 50.0% 2 397.5 397.5 397.5 397.5 0.0 24.|-- 211.29.132.83 50.0% 2 345.5 345.5 345.5 345.5 0.0 My traceroute [v0.82] Ubuntu1204-1 (0.0.0.0) Fri Dec 14 11:54:42 2012 Keys: Help Display mode Restart statistics Order of fields quit Packets Pings Host Loss% Snt Last Avg Best Wrst StDev 1. 192.168.178.1 0.0% 3 0.9 0.9 0.9 0.9 0.0 2. 62.214.64.79 0.0% 3 38.1 51.0 38.1 72.7 18.9 3. 62.214.109.13 0.0% 3 39.4 40.0 39.0 41.6 1.4 4. 62.214.110.245 0.0% 2 195.7 117.2 38.6 195.7 111.1 5. 62.214.110.241 0.0% 2 40.0 39.3 38.6 40.0 1.0 6. 62.214.111.29 0.0% 2 39.9 54.2 39.9 68.6 20.3 7. 62.214.110.237 0.0% 2 39.8 54.6 39.8 69.4 20.9 8. 149.6.138.205 0.0% 2 41.5 53.8 41.5 66.1 17.4 9. 130.117.0.121 0.0% 2 44.8 45.0 44.8 45.1 0.2 10. 154.54.37.114 0.0% 2 55.1 54.7 54.2 55.1 0.7 11. 154.54.44.209 0.0% 2 124.6 124.7 124.6 124.8 0.2 12. 154.54.44.102 0.0% 2 130.7 131.2 130.7 131.8 0.7 13. 154.54.6.154 0.0% 2 145.5 146.0 145.5 146.6 0.8 14. 154.54.84.73 0.0% 2 156.7 157.3 156.7 158.0 0.9 15. 154.54.45.66 0.0% 2 194.5 195.3 194.5 196.0 1.1 16. 154.54.7.174 0.0% 2 199.1 197.4 195.7 199.1 2.4 17. 154.54.10.170 0.0% 2 221.0 208.7 196.4 221.0 17.4 18. 203.208.148.82 0.0% 2 343.9 343.7 343.5 343.9 0.2 19. ??? 20. 210.49.105.6 0.0% 2 346.3 345.8 345.3 346.3 0.7 21. 211.29.129.38 0.0% 2 343.4 343.4 343.4 343.5 0.1 22. 211.29.129.213 0.0% 2 345.3 366.8 345.3 388.4 30.5 23. 211.29.129.202 0.0% 2 345.7 349.3 345.7 353.0 5.2 24. 211.29.132.83 0.0% 2 343.7 344.6 343.7 345.4 1.2