Security 13-19
FTP sessions.
To allow WAN-originated FTP sessions to a LAN-based FTP ser ver with the IP address a.b.c.d
(corresponding to a numbered IP address such as 163.176.8.243), inser t the following input filter ahead of the
current input filter 1:
■
Enabled: Yes
■
For ward: Yes
■
Source IP Address: 0.0.0.0
■
Source IP Address Mask: 0.0.0.0
■
Dest. IP Address: a.b.c.d
■
Dest. IP Address Mask: 255.255.255.255
■
Protocol Type: TCP
■
Source Por t Comparison: No Compare
■
Source Por t ID: 0
■
Dest. Por t Comparison: Equal
■
Dest. Por t ID: 21
Note:
A similar filter could be used to permit Telnet or WWW access. Set the Dest. Por t ID to 23 for Telnet or to
80 for WWW.
Deleting a filter set does not delete the filters in that set. However, the filters in the deleted set are no longer in
effect (unless they are par t of another set). The deleted set will no longer appear in the answer profile or any
connection profiles to which it was added.
Firewall Tutorial
General firewall terms
Filter rule
: A filter set is comprised of individual filter rules.
Filter set
: A grouping of individual filter rules.
Firewall
: A component or set of components that restrict access between a protected network and the Internet,
or between two networks.
Host
: A workstation on the network.
Packet
: Unit of communication on the Internet.
Packet filter
: Packet filters allow or deny packets based on source or destination IP addresses, TCP or UDP
por ts, or the TCP ACK bit.
Port
: A number that defines a par ticular type of ser vice.
Summary of Contents for 4752
Page 1: ...Netopia 4752 SDSL Integrated Access Device Administration Guide ...
Page 12: ...Administration Guide ...
Page 18: ...2 4 Administration Guide ...
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