A stateless Ping tool for simple tests of GIMPS implementations Christian Dickmann, Ingo Juchem, Sebastian Willert, Xiaoming Fu University of Göttingen

Outline Motivation Design Extensibility Implementation status Next steps

Motivation Initially: –to run GIMPS signaling along a chain of GIMPS nodes without the need for a full- fledged NSLP It is designed also to: –Gather information about the signaling nodes along the path: Currently, IP addresses and timestamps (to calculate RTTs) Others are possible: e.g., NTLP and NSLP states

Design Design as light-weight probing NSLP Initiator sends Ping Message with list of requested information (objects) Each Ping-aware node on the path adds the requested objects Receiver forwards Ping Message upstream towards the Initiator Intermediate nodes add information (e.g. timestamps) twice –Round Trip Times can be calculated

Extensibility Current objects: –IP address (IPv4 or IPv6) –Timestamp Ping Tool can be extended with new object types If objects are unsupported, an indication is added Possible new objects: –List of supported NSLPs –NTLP layer state information –State information of supported NSLPs Security considerations need to be addressed

Implementation status Ping Tool-01 implementation is now part of our NSIS implementation release (GIMPS draft 06) – –Together with a release of Ethereal dissectors for: GIMPS draft 06 Ping Tool 01 We have also successfully passed the ping implementation interoperability test in the interop event

Next steps Is this work useful? Shall this be adopted by the WG as a "Diagnostics NSLP"?

Thanks