D-Link DFL-860 Product Manual - Page 504
Advanced Settings, 13.1. IP Level Settings
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Chapter 13. Advanced Settings This chapter describes the additional configurable advanced settings for NetDefendOS that are not already described in the manual. In the Web Interface these settings are found under System > Advanced Settings. The settings are divided up into the following categories: Note: Activating setting changes After any advanced setting is changed, the new NetDefendOS configuration must be activated in order for the new value to take effect. • IP Level Settings, page 504 • TCP Level Settings, page 508 • ICMP Level Settings, page 513 • State Settings, page 514 • Connection Timeout Settings, page 516 • Length Limit Settings, page 518 • Fragmentation Settings, page 520 • Local Fragment Reassembly Settings, page 524 • Miscellaneous Settings, page 525 13.1. IP Level Settings Log Checksum Errors Logs occurrences of IP packets containing erroneous checksums. Normally, this is the result of the packet being damaged during network transport. All network units, both routers and workstations, drop IP packets that contain checksum errors. However, it is highly unlikely for an attack to be based on illegal checksums. Default: Enabled Log non IP4 Logs occurrences of IP packets that are not version 4. NetDefendOS only accepts version 4 IP packets; everything else is discarded. Default: Enabled Log Received TTL 0 Logs occurrences of IP packets received with the "Time To Live" (TTL) value set to zero. Under no circumstances should any network unit send packets with a TTL of 0. Default: Enabled 504