1. 41. Firewall / IP Filter
This function allows user to enable the functionality of IP filter. Both inside and outside
packets through router could be decided to allow or drop by supervisor.
Figure 41-1 IP Filter Rules
41.1 Examples and Web Configurations
Example 1 :
Employees (192.168.33.32 ~192.168.33.64) are interdicted to surf Internet. Other
employees (192.168.33.16~31) are permitted.
Figure 41-2
1. Enable the Data Filter Function.
Vigor3300 Series Application Note V2.2 255

2. Figure 41-3
2. Add new rules in Pass Group.
Figure 41-4
3. Add a rule about SMTP protocol. (port 25) for 192.168.33.16~192.168.33.31.
Figure 41-5
256 Vigor3300 Series Application Note V2.2

3. 4. Add another rule about port 53 ( DNS protocol ) , port 80 ( Http protocol ) , port 110
( POP3 protocol ) for 192.168.33.16~192.168.33.31.
Figure 41-6
5. Finally , Add a rule in block group.
Figure 41-7
6. Beside the previous rules, other connections are forbidden.
Figure 41-8
Vigor3300 Series Application Note V2.2 257

4. Example 2
Only IP 220.220.220.220 is allowed to access my VNC server from Internet as well as
only IP 220.220.220.221 is allowed to access my FTP server from Internet. (Other
Internet hosts cannot access my internal servers).
Figure 41-9
1. Enable the Data Filter Function.
Figure 41-10
2. Add new rules in Pass Group.
Figure 42-11
258 Vigor3300 Series Application Note V2.2

5. 3. Allow IP 220.220.220.220 to access my VNC server. (TCP port 5900)
Figure 41-12
4. Allow IP 220.220.220.221 to access my FTP server. (TCP port 21)
Figure 41-13
Vigor3300 Series Application Note V2.2 259

6. 5. Finally , Add a rule in block group.
Figure 41-14
6. Besides the previous rules, other incoming connections are forbidden.
Figure 41-15
260 Vigor3300 Series Application Note V2.2

7. Example 3
Some employees (IP192.168.33.128/27) can use FTP、Mail、Web service , and some (IP
192.168.33.64/26) can only use Mail service.
Figure 41-16
1. Enable the Data Filter Function.
Figure 41-17
2. Add new rules in Pass Group.
Figure 41-18
Vigor3300 Series Application Note V2.2 261

8. 3. Allow users with IP 192.168.33.64~192.168.33.127 to use Mail service (SMTP
protocol)
Figure 41-19
4. Allow users with IP 192.168.33.64~192.168.33.127 to use Mail service(POP3
protocol)
Figure 41-20
262 Vigor3300 Series Application Note V2.2

9. 5. Allow users with IP 192.168.33.64~192.168.33.127 to use DNS service.
Figure 41-21
6. Allow users with IP 192.168.33.128~192.168.33.159 to use FTP, SMTP, POP3,
WEB and DNS Services.
Figure 41-22
Vigor3300 Series Application Note V2.2 263

10. Figure 41-23
7. Add a rule in block group.
Figure 41-24
8. Beside the previous rules , other connections are forbidden.
Figure 41-25
264 Vigor3300 Series Application Note V2.2

11. Example 4
Host with IP 192.168.33.10 cannot be accessed by the remote VPN network while hosts
with IP192.168.33.5 and 192.168.33.6 can be accessed.
Figure 41-26
1. Enable the Data Filter Function.
Figure 41-27
2. Add new rules in Pass Group.
Figure 41-28
Vigor3300 Series Application Note V2.2 265

12. 3. Allow VPN connection from 192.168.29.0 to 192.168.33.5 and 192.168.33.6.
Figure 41-29
Figure 41-30
266 Vigor3300 Series Application Note V2.2

13. 4. Add a rule in block group.
Figure 41-31
5. Disallow VPN connection from 192.168.29.0 to 192.168.33.10.
Figure 41-32
Vigor3300 Series Application Note V2.2 267

14. Example 5
Some users ( 192.168.33.33 ~ 192.168.33.36 ) can surf Internet and some ( 192.168.33.16
~ 192.168.33.31 ) can only access the remote VPN network.
Figure 41-33
1. Enable the Data Filter Function.
Figure 41-34
2. Add new rules in Pass Group.
Figure 41-35
268 Vigor3300 Series Application Note V2.2

15. 3. Allow local network 192.168.33.0 to access remote VPN network 192.168.29.0
Figure 41-36
Figure 41-37
Vigor3300 Series Application Note V2.2 269

16. 4. Allow users with IP 192.168.33.32~192.168.33.35 to surf Internet ( DNS protocol )
Figure 41-38
5. Allow users with IP 192.168.33.32~192.168.33.35 to surf Internet ( HTTP
protocol )
Figure 41-39
270 Vigor3300 Series Application Note V2.2

17. 6. Add a rule in block group.
Figure 41-40
7. Beside the previous rules , Other connections are forbidden.
Figure 41-41
Vigor3300 Series Application Note V2.2 271

18. 41.2 Firewall direction
Figure 41-42
Table 42-1 Firewall /IP Filter Direction.
WAN to LAN From Internet to Intranet, ex : VNC 、Pc Anywhere remote
control
WAN to DMZ From Internet to DMZ, ex : allow Internet user to browser web
server in DMZ
WAN to WAN From WAN to WAN, ex: Allow WAN1 traffic redirect to
WAN2
LAN to WAN From Intranet to Internet, ex : surf Internet
LAN to DMZ From Intranet to DMZ, ex: allow some employees can access
DMZ.
From some security issue, we can use LAN to LAN block
LAN to LAN function to prohibited LAN1 user from visiting LAN2 resource
in VLAN environment.
DMZ to WAN From DMZ to WAN, ex:allow DMZ using Internet resources.
DMZ to LAN Form DMZ to LAN, ex: allow DMZ using inner Database.
VPN In From remote VPN network to Vigor 3300’s VPN network,
pass/block
VPN Out From Vigor3300's VPN network to remote VPN network,
pass/block
Any All direction in/out , including LAN,WAN,DMZ,VPN
272 Vigor3300 Series Application Note V2.2