How to interpret following nmap's traceroute output.

[Karel Gardas <karel.gardas () centrum cz>]

Hello,

I'm experimenting with nmap for network topology scanning and discovery
and sometime it surprises me with what I find in its trace records.
Currently I'm not able to interpret this record:

   Nmap scan report for 10.111.0.99
 [...]
   1   0.89 ms _gateway (10.0.30.138)
   2   1.47 ms 10.0.10.14
   3   ... 4
   5   2.26 ms 10.111.0.99
 [...]

while record for 10.0.10.14 looks as:
   Nmap scan report for 10.0.10.14
 [...]
   1   0.31 ms 10.0.10.14

so I'm not sure how to interpret hop 3 and 4 of 10.111.0.99 above when
10.0.10.14 is reachable only with one hop hence does not provide any hop
3 and 4.

The nmap is version 7.60 as distributed and run on Ubuntu 18.04.x LTS
with root privileges and with command-line parameters:

-T4 10.1.0.0/24 10.0.10.0/24 10.0.20.0/24 10.0.30.0/24 10.0.60.0/24
10.11.0.0/24 10.111.0.0/24 10.112.0.0/24 10.111.1.0/24 10.111.2.0/24
--stats-every 5s --traceroute

Any idea?

Thanks!
Karel
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