Default Interface - Zhone zNID-GPON-2402 Configuration Manual

System features

Default interface

When the ONU must send an internally generated packet (e.g., from SNMP
trap, SNTP, etc.) to an IP address that is not defined in the route table, the
selected default interface's IP address will be used as the source address.
This device has many internal applications such as SNMP, DHCP, DNS,
PING. If one of these applications sends a packet to an IP address which is not
defined in the route table and the application has not been directed to use a
particular interface to transmit the packet then the default interface's IP
address will be used as the source address and routing will be resolved based
on that source IP address.
Figure 10: Default interface
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zNID 24xx Series Configuration Guide