ZyXEL Communications P-334WT Technické informace stáhnout pdf (Strana 6)

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101

If the firewall is not turned on we can configure a filter set to block the IP spoofing attacks. The basic

scheme is as follows:

For the input data filter:

● Deny packets from the outside that claim to be from the inside

● Allow everything that is not spoofing us

Filter rule setup:

● Filter type =TCP/IP Filter Rule

● Active =Yes

● Source IP Addr =a.b.c.d

● Source IP Mask =w.x.y.z

● Action Matched =Drop

● Action Not Matched =Forward

Where a.b.c.d is an IP address on your local network and w.x.y.z is your netmask:

For the output data filters:

● Deny bounceback packet

● Allow packets that originate from us

Filter rule setup:

● Filter Type =TCP/IP Filter Rule

● Active =Yes

● Destination IP Addr =a.b.c.d

● Destination IP Mask =w.x.y.z

● Action Matched =Drop

● Action No Matched =Forward

Where a.b.c.d is an IP address on your local network and w.x.y.z is your netmask.

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