Netis DL4311 - 4.3.2.5 Port Trigger

ADSL2+ Modem Router User Manual
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4.3.2.5 Port Trigger:
Port trigger is used to restrict certain types of data packets from your local network to
internet. Use of such filters can be helpful in securing and restricting your local network.
Choose Advanced->NAT->Port Trigger page, you can configure the port trigger rules.