Administration of the Avaya G350 Media Gateway - Avaya Support
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Administration of the Avaya G350 Media Gateway - Avaya Support

Administration of the Avaya G350 Media Gateway - Avaya Support

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Configuring <strong>the</strong> routerDirected broadcast forwardingA directed broadcast is an IP packet whose destination address is <strong>the</strong> broadcast address <strong>of</strong> anetwork or subnet. A directed broadcast causes every host on <strong>the</strong> network to respond. You canuse directed broadcasts to obtain a list <strong>of</strong> all active hosts on <strong>the</strong> network. A hostile user canexploit directed broadcasts to launch a denial-<strong>of</strong>-service attack on <strong>the</strong> network. For eachinterface on <strong>the</strong> <strong>Avaya</strong> <strong>G350</strong> <strong>Media</strong> <strong>Gateway</strong>, you can configure whe<strong>the</strong>r <strong>the</strong> <strong>G350</strong> forwardsdirected broadcast packets to <strong>the</strong> network address or subnet mask address <strong>of</strong> <strong>the</strong> interface.Use <strong>the</strong> ip directed-broadcast command to enable directed broadcast forwarding on aninterface. Use <strong>the</strong> no form <strong>of</strong> this command to disable directed broadcast forwarding on aninterface.NetBIOS rebroadcastNetwork Basic Input Output System (NetBIOS) is a protocol for sharing resources amongdesktop computers on a LAN. You can configure <strong>the</strong> <strong>Avaya</strong> <strong>G350</strong> <strong>Media</strong> <strong>Gateway</strong> to relayNetBIOS UDP broadcast packets. This feature is used for applications such as WINS that usebroadcast but might need to communicate with stations on o<strong>the</strong>r subnetworks or VLANs.Configuration is performed on a per-interface basis. A NetBIOS broadcast packet arrives froman interface on which NetBIOS rebroadcast is enabled. The packet is distributed to all o<strong>the</strong>rinterfaces configured to rebroadcast NetBIOS.If <strong>the</strong> NetBIOS packet is a net-directed broadcast, for example, 149.49.255.255, <strong>the</strong> packet isrelayed to all o<strong>the</strong>r interfaces on <strong>the</strong> list, and <strong>the</strong> IP destination <strong>of</strong> <strong>the</strong> packet is replaced by <strong>the</strong>appropriate interface broadcast address.If <strong>the</strong> NetBIOS broadcast packet is a limited broadcast, for example, 255.255.255.255, it isrelayed to all VLANs on which <strong>the</strong>re are NetBIOS-enabled interfaces. In that case, <strong>the</strong>destination IP address remains <strong>the</strong> limited broadcast address.Use <strong>the</strong> ip netbios-rebroadcast both command to enable NetBIOS rebroadcasts on aninterface. Use <strong>the</strong> ip netbios-rebroadcast disable command to disable NetBIOSrebroadcasts on an interface.186 <strong>Administration</strong> <strong>of</strong> <strong>the</strong> <strong>Avaya</strong> <strong>G350</strong> <strong>Media</strong> <strong>Gateway</strong>

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