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Date Submitted

Last Update

0005641

IPv6overGeoNetworking

Base Spec

public

02-08-2010 11:22

08-09-2010 15:33

Reporter

Andras Kovacs

Assigned To

Roberto Baldessari

Priority

normal

Severity

text

Reproducibility

N/A

Status

resolved

Resolution

fixed

Platform

OS Version

Product Version

v0.0.7

Target Version

Fixed in Version

Next Release

Summary

0005641: TS102636-6-1 v0.0.7 : comment on the directionality of virtual interfaces

Description

The document does not discuss the directionality of created virtual interfaces, therefore it is implicitly assumed that all TVLs and GVLs are bi-directional interfaces.

The experience from the performance evaluation of GeoNet implementation has been that bi-directional TUN/TAP virtual devices can have a performance degradation when the operating system does not handle packet collisions for the incoming/outgoing directions. (the Linux system we have been working with did not handle those).

Is this issue just an implementation issue? If yes, then it would be helpful for the document to say something like 'it is recommended to ensure that the implementation's operating system handles full-duplex communication over the virtual interface devices'. Otherwise this experience may be lost knowledge.

If it is more than implementation issue, then the document may consider to allow e.g. separate GVLs for the incoming / outgoing directions.

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Notes
(0009724) Roberto Baldessari (developer) 08-09-2010 15:33	Testing issue 0005641 resolved in v0.0.8 by adding the following paragraph in section 5.3.1: "Virtual interfaces used to implement GVLs and TVLs and the underlying operating system should support bidirectional communications. This is required in order to maintain symmetric reachability in a GVL. This recommendation originates from the implementation experience offered by the European GeoNet project (more references in annex D.3)." Further, previous section 5.3.1 and 5.3.2 have been merged into one section called "recommended properties" (of virtual interfaces).

Issue History
Date Modified	Username	Field	Change
02-08-2010 11:22	Andras Kovacs	New Issue
24-08-2010 10:47	Sebastian Muellers	Product Version	=> v0.0.7
24-08-2010 10:48	Sebastian Muellers	Status	new => assigned
24-08-2010 10:48	Sebastian Muellers	Assigned To	=> Roberto Baldessari
08-09-2010 15:33	Roberto Baldessari	Status	assigned => resolved
08-09-2010 15:33	Roberto Baldessari	Fixed in Version	=> Next Release
08-09-2010 15:33	Roberto Baldessari	Resolution	open => fixed
08-09-2010 15:33	Roberto Baldessari	Note Added: 0009724

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