Chapter 25 Security Policy
ZyWALL ATP Series User’s Guide
488
25.5.4 Protocol Anomaly Profiles
Protocol anomalies are packets that do not comply with the relevant RFC (Request For Comments).
Protocol anomaly detection includes:
• TCP Decoder
• UDP Decoder
• ICMP Decoder
• IP Decoder
Teardrop
When an IP packet is larger than the Maximum Transmission Unit (MTU) configured in the Zyxel Device, it
is fragmented using the TCP or ICMP protocol.
A Teardrop attack falsifies the offset which defines the size of the fragment and the original packet. A
series of IP fragments with overlapping offset fields can cause some systems to crash, hang, or reboot
when fragment reassembling is attempted at the destination.
IP Spoofing
IP Spoofing is used to gain unauthorized access to network devices by modifying packet headers so
that it appears that the packets originate from a host within a trusted network.
• In an IP Spoof from the WAN, the source address appears to be in the same subnet as a Zyxel Device
LAN interface.
• In an IP Spoof from a LAN interface, the source address appears to be in a different subnet from that
Zyxel Device LAN interface.
Содержание ATP200
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Страница 218: ...Chapter 9 Interfaces ZyWALL ATP Series User s Guide 218 Figure 170 Configuration Network Interface Ethernet Edit OPT ...
Страница 236: ...Chapter 9 Interfaces ZyWALL ATP Series User s Guide 236 Figure 179 Configuration Network Interface PPP Add ...
Страница 244: ...Chapter 9 Interfaces ZyWALL ATP Series User s Guide 244 Figure 181 Configuration Network Interface Cellular Add Edit ...
Страница 259: ...Chapter 9 Interfaces ZyWALL ATP Series User s Guide 259 Figure 191 Configuration Network Interface VLAN Add Edit ...
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Страница 273: ...Chapter 9 Interfaces ZyWALL ATP Series User s Guide 273 Figure 193 Configuration Network Interface Bridge Add Edit ...
Страница 361: ...Chapter 15 UPnP ZyWALL ATP Series User s Guide 361 Figure 250 Network Connections My Network Places Properties Example ...
Страница 387: ...Chapter 20 IPSec VPN ZyWALL ATP Series User s Guide 387 Figure 271 Configuration VPN IPSec VPN VPN Connection Add Edit ...
Страница 395: ...Chapter 20 IPSec VPN ZyWALL ATP Series User s Guide 395 Figure 273 Configuration VPN IPSec VPN VPN Gateway Add Edit ...
Страница 478: ...Chapter 25 Security Policy ZyWALL ATP Series User s Guide 478 Figure 328 Configuration Security Policy Policy Control ...
Страница 712: ...Chapter 37 System ZyWALL ATP Series User s Guide 712 Figure 470 Configuration System WWW Login Page Desktop View ...