Specifications

3
Firewall Administration System (FAS)
Figure 3.18: Masquerading Dialog
Destination Port For ‘From:’, enter the destination port. For ‘To:’, define a
series of ports.
Redirect Address Specify the IP address to which the packet is redirected.
Redirect Port Enter the port to which packets are redirected.
ICMP to Firewall
ICMP (Internet Control Message Protocol) is used for error analysis in the
network. ICMP send messages describing the error states of IP, TCP, or UDP
datagrams. Instead of ports, ICMP has message types containing the header
and the first eight bytes of the packet concerned. A well-known example is
ping, which sends an echo request to a computer, which then reacts with
an echo reply.
In the ICMP mask, shown in Figure 3.20 on page 57, create new rules, with
‘Create ICMP Rule’, which are then included in the overview window if you
click ‘Add’. Edit a defined rule by clicking it then editing the entry fields.
55SuSE Linux – Firewall on CD2