<html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> </head> <body text="#000000" bgcolor="#FFFFFF"> 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. </body> </html>