Planet Technology 802.11g Wireless ADSL 2/2+ Router ADW-4401A/Bv2 - Manual (Page 56)

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Firewall: Select this option can automatically detect and block Denial of Service
(DoS) attacks, such as Ping of Death, SYN Flood, Port Scan and Land Attack.
SPI: Select this option to Enabled or Disabled the SPI feature.
(NOTE: If you enable SPI, all traffics initiate from WAN would be blocked, including
DMZ, Virtual Server, and ACL WAN side)
Appendix A: Glossary
Address mask
A bit mask select bits from an Internet address for subnet addressing. The mask is 32
bits long and selects the network portion of the Internet address
and one or more bits of the local portion. Sometimes it called subnet mask.
AAL5
ATM Adaptation Layer - This layer maps higher layer user data into ATM cells,
making the data suitable for transport through the ATM network.
ADSL
Asymmetric digital subscriber line
ATM
Asynchronous Transfer Mode - A cell-based data transfer technique in which channel
demand determines packet allocation. ATM offers fast packet technology,
real time, and demand led switching for efficient use of network resources.