RIPE NCC: Query Routing Vector Database Results.
Query Routing Vector Database Results
Example.
tt20 to tt17
This is an example of the output of the script. A user asked for the routes
between tt20 and tt17 from February 14, midnight, to February 16, midnight.
The script returned a page starting with this table;
| Dates | Route-ID | Records | Element | IP Address | Hostname |
|---|
From Sat Feb 13 22:44:38 1999
To Mon Feb 15 23:40:42 1999 | 11821 | 706 | 1 | 195.178.64.1 | r1-prg-le.ten.cz | | 2 | 194.108.60.1 | rab.ctt.cz | | 3 | 192.121.157.65 | czpra301-ta-s0-0-1.ebone.net | | 4 | 192.121.158.185 | Unknown address | | 5 | 192.121.158.169 | Unknown address | | 6 | 195.158.226.137 | Unknown address | | 7 | 195.158.226.134 | Unknown address | | 8 | 195.158.226.142 | demun704-ta-p5-0-0.ebone.net | | 9 | 192.121.157.137 | itmil201-ta-s1-0-1.ebone.net | | 10 | 192.121.156.137 | Unknown address | | 11 | 192.121.156.142 | s0-1-1-gw0.nettuno.it | | 12 | 193.43.2.18 | ntp.nettuno.it |
The table above shows the traceroute output between tt20.ripe.net to
tt17.ripe.net.
A traceroute between each pair of test-boxes is done (approximately) 10 times an
hour. On February 13, at 22:44, traceroute found the route shown above between
the two hosts. The entry was selected from the data-base because it is the
last measurement before the specified interval started.
This vector got reference number 11821 and contained 12 elements or hops.
The first entry is 195.178.64.60, which translates into testbox.ten34.ces.net.
tt20.ripe.net is an alias for that name.
The traceroutes are done 10 times an hour, traceroutes that produce the same output
are not show. The next table shows the first route that was different.
| Dates | Route-ID | Records | Element | IP Address | Hostname |
|---|
From Mon Feb 15 23:40:43 1999
To Mon Feb 15 23:43:35 1999 | 12000 | 1 | 1 | 195.178.64.1 | r1-prg-le.ten.cz | | 2 | 194.108.60.1 | rab.ctt.cz | | 3 | 192.121.157.65 | czpra301-ta-s0-0-1.ebone.net | | 4 | 192.121.158.185 | Unknown address | | 5 | 192.121.158.169 | Unknown address | | 6 | 195.158.226.137 | Unknown address | | 7 | 195.158.226.134 | Unknown address | | 8 | 195.158.226.142 | demun704-ta-p5-0-0.ebone.net | | 9 | 192.121.157.137 | itmil201-ta-s1-0-1.ebone.net | | 10 | 192.121.156.137 | Unknown address | | 11 | 192.121.156.142 | s0-1-1-gw0.nettuno.it | | 12 | 255.255.255.255 | Unknown address | | 13 | 193.43.2.18 | ntp.nettuno.it |
| Dates | Route-ID | Records | Element | IP Address | Hostname |
|---|
From Mon Feb 15 23:43:36 1999
To Tue Feb 16 03:58:12 1999 | 11821 | 74 | 1 | 195.178.64.1 | r1-prg-le.ten.cz | | 2 | 194.108.60.1 | rab.ctt.cz | | 3 | 192.121.157.65 | czpra301-ta-s0-0-1.ebone.net | | 4 | 192.121.158.185 | Unknown address | | 5 | 192.121.158.169 | Unknown address | | 6 | 195.158.226.137 | Unknown address | | 7 | 195.158.226.134 | Unknown address | | 8 | 195.158.226.142 | demun704-ta-p5-0-0.ebone.net | | 9 | 192.121.157.137 | itmil201-ta-s1-0-1.ebone.net | | 10 | 192.121.156.137 | Unknown address | | 11 | 192.121.156.142 | s0-1-1-gw0.nettuno.it | | 12 | 193.43.2.18 | ntp.nettuno.it |
The next vector that was used was number 12000. This vector is longer,
13 instead of 12 elements and completely different.
This new vector was used from February 15, 22:40 to February 15, 23:44.
After that, the original route was used again.
Note that exact time when the vector was changed is not known. We use the
traceroute program to determine the route between two points (on average) 10 times
an hour or (on average) every 6 minutes. Traceroute only finds the path between
two hosts at the time it is run. If two subsequent runs produce different
results, then all one can conclude is that the change occurred sometime between
the two runs.
When printing the time-stamps, we assume that change occur immediately
after a traceroute. In reality, the change may be made several minutes later,
so "Feb 13, 22:40", should be interpreted as "sometime in the
6 minutes interval following Feb 15, 22:40:38".
One should also keep in mind that the web-page only shows the changes
that it has noticed. There is on average a 6 minute interval between two traceroutes,
so two subsequent traceroutes will never notice a change that is made and undone
again in the time between 2 measurements.
If a router does not return it's IP-address, then it will appear as 255.255.255.255
in the list.
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