Bug 2083 – BridgeNetDevice may send corrupted packets

Bug 2083 - BridgeNetDevice may send corrupted packets


Summary:	BridgeNetDevice may send corrupted packets

Status:	RESOLVED FIXED

Product:	ns-3
Classification:	Unclassified
Component:	bridge
Version:	ns-3-dev
Hardware:	All All

Importance:	P5 normal
Assigned To:	Gustavo J. A. M. Carneiro

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2015-03-25 11:55 UTC by Tommaso Pecorella
Modified:	2015-03-25 12:01 UTC (History)
CC List:	1 user (show)

See Also:

Attachments
fix (2.41 KB, patch) 2015-03-25 11:58 UTC, Tommaso Pecorella	Details \| Diff
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Description Tommaso Pecorella 2015-03-25 11:55:32 UTC

How is it possible that nobody did notice before ?

When the BridgeNetDevice sends a packet, it may forward it to all the interfaces. When this happens, the packet is re-used. As a consequence, if an interface modifies the packet (e.g., by adding an header), the next interface will have a corrupted packet.

As a side note, the wifi-wired-bridging examples has wrong IP numbers in the figure.

Comment 1 Tommaso Pecorella 2015-03-25 11:58:51 UTC

Created attachment 2001 [details]
fix

Comment 2 Tommaso Pecorella 2015-03-25 12:01:59 UTC

Pushed in changeset:   11237:77e2228781ac

Forgot to mention that the bug was found by Red Zhaoyj here:
https://groups.google.com/forum/#!topic/ns-3-users/bWtPoLMXUeY