Sometimes mtr displays negative times. For example, look at the "best"
value for the last two hops below:
Matt's traceroute [v0.51]
jones Tue Sep 17 08:55:32 2002
Keys: D - Display mode R - Restart statistics Q - Quit
Packets Pings
Hostname %Loss Rcv Snt Last Best Avg Worst
1. user1.net127.va.sprint-hsd.net 0% 232 232 6 5 11 339
2. user2.net130.va.sprint-hsd.net 0% 232 232 6 5 17 377
3. sl-gw21-rly-4-0-TS2.sprintlink.net 0% 232 232 23 22 30 415
4. sl-bb21-rly-3-0.sprintlink.net 0% 231 231 23 22 39 421
5. sl-bb22-rly-13-0.sprintlink.net 0% 231 231 24 22 38 420
6. sl-bb20-nyc-12-0.sprintlink.net 0% 231 231 28 27 40 420
7. sl-bb12-nyc-9-0.sprintlink.net 0% 231 231 27 27 33 427
8. jfk3-core4-s3-5.atlas.algx.net 0% 231 231 30 27 35 434
9. dca6-core4-pos3-0.atlas.algx.net 1% 229 231 97 83 118 499
10. dca10-core2-so-7-2-0-0.atlas.algx.n 4% 224 231 51 41 71 475
11. dca10-core1-so-0-1-0-0.atlas.algx.n 2% 228 231 75 43 69 470
12. atl10-core2-so-0-2-0-0.atlas.algx.n 4% 223 231 107 70 101 448
13. atl10-core1-so-0-1-0-0.atlas.algx.n 4% 224 231 123 71 99 410
14. atl1-core5-pos2-0.atlas.algx.net 1% 229 231 286 85 121 364
15. atl1-core3-pos7-0.atlas.algx.net 3% 226 231 105 86 118 324
16. mia1-core3-pos6-3.atlas.algx.net 2% 227 231 99 4 114 331
17. mia1-cpe3-pos2-0.atlas.algx.net 1% 229 231 98 82 113 368
18. ibcinc-gw.ibcinc.com 4% 224 231 104 -148 110 416
19. owl.ibcinc.com 1% 230 231 100 -153 107 467