Prestige 2602HW Series User’s Guide
Chapter 13 Firewalls
155
13.4.2.3 Traceroute
Traceroute is a utility used to determine the path a packet takes between two endpoints.
Sometimes when a packet filter firewall is configured incorrectly an attacker can traceroute
the firewall gaining knowledge of the network topology inside the firewall.
Often, many DoS attacks also employ a technique known as "
IP Spoofing
" as part of their
attack. IP Spoofing may be used to break into systems, to hide the hacker's identity, or to
magnify the effect of the DoS attack. IP Spoofing is a technique used to gain unauthorized
access to computers by tricking a router or firewall into thinking that the communications are
coming from within the trusted network. To engage in IP spoofing, a hacker must modify the
packet headers so that it appears that the packets originate from a trusted host and should be
allowed through the router or firewall. The Prestige blocks all IP Spoofing attempts.
13.5 Stateful Inspection
With stateful inspection, fields of the packets are compared to packets that are already known
to be trusted. For example, if you access some outside service, the proxy server remembers
things about your original request, like the port number and source and destination addresses.
This “remembering” is called
saving the state.
When the outside system responds to your
request, the firewall compares the received packets with the saved state to determine if they
are allowed in. The Prestige uses stateful packet inspection to protect the private LAN from
hackers and vandals on the Internet. By default, the Prestige’s stateful inspection allows all
communications to the Internet that originate from the LAN, and blocks all traffic to the LAN
that originates from the Internet. In summary, stateful inspection:
• Allows all sessions originating from the LAN (local network) to the WAN (Internet).
• Denies all sessions originating from the WAN to the LAN.
Table 45
Legal SMTP Commands
AUTH
DATA
EHLO
ETRN
EXPN
HELO
HELP
NOOP
QUIT
RCPT
RSET
SAML
SEND
SOML
TURN
VRFY
Summary of Contents for Prestige 2602HW Series
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Page 40: ...Prestige 2602HW Series User s Guide 40 Introduction to DSL...
Page 72: ...Prestige 2602HW Series User s Guide 72 Chapter 4 Password Setup...
Page 102: ...Prestige 2602HW Series User s Guide 102 Chapter 6 Wireless LAN Setup...
Page 112: ...Prestige 2602HW Series User s Guide 112 Chapter 7 WAN Setup...
Page 124: ...Prestige 2602HW Series User s Guide 124 Chapter 8 Network Address Translation NAT Screens...
Page 130: ...Prestige 2602HW Series User s Guide 130 Chapter 9 Introduction to VoIP...
Page 142: ...Prestige 2602HW Series User s Guide 142 Chapter 10 Voice Screens...
Page 148: ...Prestige 2602HW Series User s Guide 148 Chapter 12 Time and Date...
Page 162: ...Prestige 2602HW Series User s Guide 162 Chapter 13 Firewalls...
Page 192: ...Prestige 2602HW Series User s Guide 192 Chapter 16 Remote Management Configuration...
Page 206: ...Prestige 2602HW Series User s Guide 206 Chapter 17 Universal Plug and Play UPnP...
Page 212: ...Prestige 2602HW Series User s Guide 212 Chapter 18 Logs Screens...
Page 214: ...Prestige 2602HW Series User s Guide 214 Chapter 19 Maintenance Figure 102 System Status...
Page 224: ...Prestige 2602HW Series User s Guide 224 Chapter 19 Maintenance...
Page 232: ...Prestige 2602HW Series User s Guide 232 Chapter 20 Introducing the SMT...
Page 236: ...Prestige 2602HW Series User s Guide 236 Chapter 21 Menu 1 General Setup...
Page 240: ...Prestige 2602HW Series User s Guide 240 Chapter 22 Menu 2 WAN Backup Setup...
Page 244: ...Prestige 2602HW Series User s Guide 244 Chapter 23 Menu 3 LAN Setup...
Page 248: ...Prestige 2602HW Series User s Guide 248 Chapter 24 Wireless LAN Setup...
Page 254: ...Prestige 2602HW Series User s Guide 254 Chapter 25 Internet Access...
Page 268: ...Prestige 2602HW Series User s Guide 268 Chapter 27 Static Route Setup...
Page 272: ...Prestige 2602HW Series User s Guide 272 Chapter 28 Bridging Setup...
Page 288: ...Prestige 2602HW Series User s Guide 288 Chapter 29 Network Address Translation NAT...
Page 304: ...Prestige 2602HW Series User s Guide 304 Chapter 31 Filter Configuration...
Page 324: ...Prestige 2602HW Series User s Guide 324 Chapter 34 System Information and Diagnosis...
Page 340: ...Prestige 2602HW Series User s Guide 340 Chapter 35 Firmware and Configuration File Maintenance...
Page 346: ...Prestige 2602HW Series User s Guide 346 Chapter 36 System Maintenance...
Page 350: ...Prestige 2602HW Series User s Guide 350 Chapter 37 Remote Management...
Page 362: ...Prestige 2602HW Series User s Guide 362 Chapter 39 Call Scheduling...
Page 366: ...Prestige 2602HW Series User s Guide 366 Chapter 40 Internal SPTGEN...
Page 372: ...Prestige 2602HW Series User s Guide 372 Chapter 41 Troubleshooting...
Page 376: ...Prestige 2602HW Series User s Guide 376 Appendix A Hardware Specifications...
Page 396: ...Prestige 2602HW Series User s Guide 396 Appendix C IP Subnetting...
Page 402: ...Prestige 2602HW Series User s Guide 402 Appendix E Wireless LAN and IEEE 802 11...
Page 409: ...Prestige 2602HW Series User s Guide Appendix H Triangle Route 409...
Page 410: ...Prestige 2602HW Series User s Guide 410 Appendix H Triangle Route...
Page 434: ...Prestige 2602HW Series User s Guide 434 Appendix J Command Interpreter...
Page 436: ...Prestige 2602HW Series User s Guide 436 Appendix K Firewall Commands...