| Character encoding of routes |
Route numbers and Cell coloring |
|---|
- A '.' indicates that the traceroute was exactly the same as the previous one.
- A "*" indicates that one or more hops did not respond
- A magenta character a-z or 0-9 indicates that
an ! annotation was found in the traceroute, and the character was the accompanying
code. If the character is orange, it indicates that a
checksum error was also found in the traceroute.
- A '|' indicates that the last hop
was not reachable (i.e. the traceroute terminated after 30 hops, possibly
the end host is behind a firewall).
- A ':' indicates the only difference from the previous route
is one or more nodes only differ in the last (4th) octet of the IP address.
- An 'a' indicates the only difference from the previous
route is one or more nodes have different IP
addresses but they are in the same Autonomous System (AS)
- A "'" indicates a stutter, i.e. a router responded to multiple TTLs,
- An orange .
or |
or :
or *
or a
or ''
of orange route number icon indicates there was an ICMP
checksum error noted in the traceroute.
- A red ? indicates the host
was unknown (probably name was unresolvable).
- A red t indicates the
traceroute command hung and had to be terminated. There was no output.
- A 'u' indicates that we were unable to parse traceroute.
|
- Numbered blocks:
- A red numbered block indicates that there was more than
one change in the traceroute from the previous one,
and it was not just the case of a single router not
responding, and the router
was not in the same subnet or Autonomous System (AS)
- An orange numbered block indicates that the traceroute
significantly differed from the previous one
in only one hop.
The numbers in the blocks are the route number identifiers, and have no signifcance other
the fact that they are an index which points to the route in the 'R' link.
In case the routenumber identifier is larger than two digits, an iconic
 is used and the route number in in the mouse over
message.
No entry probably means no measurement was made, maybe the measurement host was down.
Placing the mouse over a numbered block will show the time
the trace was done, the number of hops, and the RTT to the end node.
- Table cells with a colored background indicate a change in available
bitrate was detected.
|
The links in the row headings on the left & right are used as follows
(n.b. for privacy reasons, links with an asterisk (*) are only accessible
from SLAC hosts):
) of the selected routes.