Draytek Vigor2920n User's Guide download pdf (Page 170)

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Vigor2920 Series User’s Guide

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once they re-construct the packets. The Vigor routers will

block any packets realizing this attacking activity.

Block ICMP Fragment

Check the box to activate the Block ICMP fragment function.

Any ICMP packets with more fragment bit set are dropped.

Block Unknown Protocol

Check the box to activate the Block Unknown Protocol

function. Individual IP packet has a protocol field in the

datagram header to indicate the protocol type running over the

upper layer. However, the protocol types greater than 100 are

reserved and undefined at this time. Therefore, the router

should have ability to detect and reject this kind of packets.

Warning Messages

We provide Syslog function for user to retrieve message from

Vigor router. The user, as a Syslog Server, shall receive the

report sending from Vigor router which is a Syslog Client.

All the warning messages related to DoS Defense will be sent

to user and user can review it through Syslog daemon. Look for

the keyword DoS in the message, followed by a name to

indicate what kind of attacks is detected.

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Draytek Vigor2920n User's Guide Page 170

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