Compex Technologies 18A Manuale Utente
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More firewall rules can be added for specific security purposes.
Rule Name
Rule Name
: Enter a unique name to identify this firewall rule.
Disposition
Policy
Policy
: This parameter determines whether the packets obeying the rule
should be accepted or denied by the firewall.
Choose between Accept, or Deny.
Choose between Accept, or Deny.
Protocols
: Users are allowed to select the type of data packet from: TCP, UDP,
ICMP, IGMP, or ALL.
Note: If users select either ICMP or IGMP, they are required to make
further selection on ICMP Types or IGMP Types respectively.
further selection on ICMP Types or IGMP Types respectively.
ICMP Types
: This IP protocol is used to report errors in IP packet routing.
ICMP serves as a form of flow control, although the receiving and
transmitting of ICMP messages is not guaranteed.
transmitting of ICMP messages is not guaranteed.
ICMP Packet Type
Description
Echo request
Determines whether an IP node (a host or
a router) is available on the network.
a router) is available on the network.
Echo reply
Replies to an ICMP echo request.
Destination
unreachable
unreachable
Informs the host that a datagram cannot
be delivered.
be delivered.
Source quench
Informs the host to lower the rate at which
it sends datagrams because of
it sends datagrams because of