[atlas] Traceroute path consistency

On 8/15/12 12:39 , David Lebrun wrote:
>
> I have a suggestion regarding the udp traceroute feature: allowing the
> user to specify the source port.
>
> The motivation for this suggestion is to keep consistent paths between
> two traceroutes towards the same destination. I understand that the
> source port is used to discriminate concurrent traceroutes, so perhaps
> allocating a range for user-defined source ports would do the trick.
>
>
The paris-traceroute mode, which is default for firmware above 4400
keeps the source port consistent as long as a UDM is running on a probe.
It does vary the destination port to trigger different routes, but the
variation is included in the output (paris_id)

Unfortunately, for IPv4 the source port is needed by the traceroute
implementation, so it cannot be made user settable.

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