ZyXEL P-660R-T1 v3s User Guide - Page 102
The Firewall Screen, LAND Attack, Ping of Death
View all ZyXEL P-660R-T1 v3s manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 102 highlights
Chapter 13 Firewall LAND Attack In a LAND attack, hackers flood SYN packets into the network with a spoofed source IP address of the target system. This makes it appear as if the host computer sent the packets to itself, making the system unavailable while the target system tries to respond to itself. Ping of Death Ping of Death uses a "ping" utility to create and send an IP packet that exceeds the maximum 65,536 bytes of data allowed by the IP specification. This may cause systems to crash, hang or reboot. SPI Stateful Packet Inspection (SPI) tracks each connection crossing the firewall and makes sure it is valid. Filtering decisions are based not only on rules but also context. For example, traffic from the WAN may only be allowed to cross the firewall in response to a request from the LAN. 13.2 The Firewall Screen Use this screen to enable firewall and/or SPI. Click Advanced Setup > Firewall to display the following screen. Figure 44 Advanced Setup > Firewall The following table describes the labels in this screen. Table 32 Advanced > Firewall LABEL DESCRIPTION Firewall Use this field to enable or disable firewall on your ZyXEL Device. SPI Use this field to enable or disable SPI on your ZyXEL Device. SAVE Click this to save your changes. CANCEL Click this to restore your previously saved settings. 1 Enabling SPI blocks all traffic initiated from the WAN side, including the DMZ, virtual server and ACL on the WAN side. 102 P-660R-Tx v3s User's Guide