Gaia IP Broadcast Helper does not forward Directed Broadcast traffic

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Technical Level

Solution ID	sk103963
Technical Level
Product	Security Gateway, ClusterXL, Cluster - 3rd party, VSX
Version	R75.40, R75.40VS, R75.45, R75.46, R75.47, R76, R77, R77.10, R77.20
OS	Gaia
Platform / Model	All
Date Created	30-Dec-2014
Last Modified	17-May-2017

Symptoms

Gaia IP Broadcast Helper was configured per sk98810, but Directed Broadcast traffic is not forwarded.
SmartView Tracker does not show any drops of Directed Broadcast packets.
Traffic capture with TCPDump on the incoming interface of Security Gateway shows the Directed Broadcast packets.
Traffic capture with TCPDump on the outgoing interface of Security Gateway does not shows any forwarded Broadcast packets.
Traffic capture with FW Monitor shows:
1. Broadcast packets go through Pre-Inbound ("i") and Post-Inbound chain ("I")
2. Broadcast packets go through Pre-Outbound ("o") only (no Post-Outbound chain ("O"))
Kernel debug ('fw ctl debug -m fw + drop') does not show any drops of Directed Broadcast packets.

Cause

By design, IP Broadcast Helper does not support forwarding of broadcast packets to broadcast IP address. Gaia IP Broadcast Helper forwards only UDP packets and only to specific servers (in Unicast).

Solution

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