Firewalls For Dummies 2nd Edition phần 3 pps

... data portion (for example, the HTTP data) contains instructions for how long the data is valid or instructions not to cache the result at all. The information is probably encrypted for a good reason ... that case, network traffic for all ports on 23. 1.4.12 are forwarded to 10.1.65.7. Note that normal packet filters are still used to determine which ports are actually forwarded to the...

Ngày tải lên: 14/08/2014, 02:20

... 8-7 must be implemented at the firewall. Internet Firewall 23. 23. 1. 235 VPN server 1 23. 23. 2 .35 VPN server 2 172.16.1.211 Firewall 39 .200.1.2 Remote client Figure 8-6: Choosing a tunneling protocol. 159 Chapter ... 172.16.1.206 53 Allow DNS TCP Any Any 172.16.1.206 53 Allow* * Connections to TCP 53 are only required for zone transfers where the internal DNS server is the maste...

Ngày tải lên: 14/08/2014, 02:20

... as when you’re prompting for input. ߜ Use printf() when fancy formatted output is required. text — nothing fancy. when you don’t want the 11 570684 Ch07.qxd 3/ 31/04 2:52 PM Page 79 Chapter ... editor. Save the file to disk as METHUS1.C. 12 570684 Ch08.qxd 3/ 31/04 2:52 PM Page 1 03 Chapter 8: Charting Unknown Cs with Variables 1 03 The first solution is to use a variable to...

Ngày tải lên: 12/08/2014, 09:21

... . . . . . . . . . .36 7 Sam Spade 36 8 Nmap 36 9 Netstat 36 9 TCPView 37 0 TDIMon 37 0 FPort 37 1 Snort 37 1 Internet Scanner 37 2 Nessus 37 3 Network Monitor 37 3 Ethereal 37 3 NetCat 37 4 Chapter 20: Ten ... 38 1 www.interhack.net/pubs/fwfaq 38 1 Firewall Lists 38 2 Appendix: Protocol Listings and More 38 3 IP Protocol Numbers 38 3 ICMP Type Numbers 38 4 TCP and UDP Port L...

Ngày tải lên: 14/08/2014, 02:20

... External Port Internal IP Internal Port Address Protocol Address 23. 16.16.5 TCP 80 192.168.2 23. 23 80 23. 16.16.5 TCP 4 43 192.168.2 23. 23 4 43 After the static address mappings are defined, the firewall ... Port Address Protocol Address 23. 16.16.5 TCP 17 23 192.168.2 23. 22 17 23 23. 16.16.5 ID 47 192.168.2 23. 22 The static address mapping ensures that all data sent to TCP port...

Ngày tải lên: 14/08/2014, 02:20

... 23. 0.2.12 23. 0.1.65 ID 50 Any Any IPSec ESP Input 23. 0.2.12 23. 0.1.65 ID 51 Any Any IPSec AH Output 23. 0.1.65 23. 0.2.12 UDP 500 500 IKE Output 23. 0.1.65 23. 0.2.12 ID 50 Any Any IPSec ESP Output 23. 0.1.65 ... Client Tunnel server Internet 23. 16.16.5 39 .100.24.5 External client 192.168.2 23. 22 192.168.2 23. 0/24 192.168.222 .3 192.168.222.0/24 Figure 12-4: A two- firewall DMZ fo...

Ngày tải lên: 14/08/2014, 02:20

... version 3. 7 from www.zonelabs.com. You’ll download one executable file named zaSetup _37 _1 43. exe. The Web site also offers ZoneAlarm Pro and ZoneAlarm Plus, which are not free. 3. Run zaSetup _37 _1 43. exe ... intruder you want to block and select Block Intruder. In the submenu, select For an Hour, For a Day, For a Month, or Forever. 3. In the Please Confirm dialog box, click...

Ngày tải lên: 14/08/2014, 02:20

... Server comes in two editions, the Standard Edition and the Enterprise Edition, and you begin to wonder, “Which of these editions is right for me?” Because the Enterprise Edition is considerably ... Standard Edition, examine what you may gain by using the Enterprise Edition. The Enterprise Edition can do everything that the Standard Edition does — and more. You should con- sider t...

Ngày tải lên: 14/08/2014, 02:20

... determine what log formats are supported by the firewall. For example, does the firewall support recording data to a database, or does it store the information in propri- etary log file formats? The ... enter the following information on the General tab: Name: A logical name for the interface IP Address: The IP address for the network interface Net Mask: The subnet mask for the networ...

Ngày tải lên: 14/08/2014, 02:20

... 35 3 installation, 34 2 34 7 intrusion detection, 33 6 33 7 NAT support, 33 7 network segment, defining, 35 2 performance of, 33 8 33 9 rule base, 35 3 35 5 SmartDashboard client, 34 8 35 5 system requirements for, 34 2 tracking ... defining, 34 9 35 0 configuration, 34 7 35 5 content filtering, 33 5 33 6 deployment examples, 34 0 34 1 extending, 33 2 features of, 33 1 33 9 fi...

Ngày tải lên: 14/08/2014, 02:20