Hi all, Just a quick question. What is the real difference between a TCP paris-traceroutes and an UDP paris-traceroute ? How do the probes perform each of them? Thanks, Best regards, Roderick On 26.06.2014 13:13, Philip Homburg wrote:

Hi Juan,

On 2014/06/19 16:59 , Juan Antonio Cordero Fuertes wrote:

...

Not sure this is the right place to ask this... sorry if it is not.

I'm trying to configure Paris-traceroute measurements, and it is not clear for me what is the meaning of the /paris/ parameter. In https://atlas.ripe.net/docs/udm/ it is said that it corresponds, for values from 1 to 16, to "the number of variations to be used for a Paris traceroute <http://www.paris-traceroute.net/>". What is this? Does it correspond to the number of initial probes to be used by paris-traceroute? I am unable to figure it out from the RIPE Atlas docs... any indication would be appreciated.

Paris-traceroute tries to make sure that all packets of a traceroute take the same route through a load balancer. This in contrast to traditional traceroute where packets from different hops typically take different routes when load balancers are involved.

However, in the case of paris-traceroute it is still interesting to find out if there are multiple routes or not. For this reason, the traceroute measurement creates different variations that may take a different route.

Each interval, it will try one variation. So if you select 16 variations then it will take 16 intervals before you get back to the first one.

Philip