Altigen ACM 6.5 Administration Manual page 398

Configuring the NICs
3. Enter an IP address and subnet for the NIC. When configuring the second NIC on the
Softswitch, use the same subnet.
4. For the sharing NIC, set the Default gateway.
For the redundancy control NIC, leave the Default gateway field empty.
5. Click the Advanced button, and make sure Automatic Metric is checked:
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MAXCS ACM 6.5 Administration Manual