Configuring TCP/IP Packet Filters
One of the most useful features in RRAS is its ability to selectively filter TCP/IP packets in both directions.
Filters are usually used to block out undesirable traffic. In general, the idea is to keep out packets that your machine doesn’t need to see. You can construct filters that allow traffic into or deny traffic out of your network based on rules that specify source and destination addresses and ports.
The basic idea behind packet filtering is simple:
1. You specify filter rules.
2. Incoming packets are measured against those rules.
There are two types of filter rule:
- Accept all packets except those prohibited by a rule.
- Drop all packets except those permitted by a rule.
Filters are associated with ...
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