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Cyclades-PR1000
Chapter 7 Network Protocols
50
Network Protocol (IP) Menu (Continued)
Parameter Description
IP MTU Assigns the size of the Maximum Transmission Unit for the interface. This
determines whether or not a given IP datagram is fragmented.
IP Fragmentation - Ignore
Bit DF
When this parameter is set to No, the DF (Do Not Fragment) bit in the IP header
causes IP to reject a packet that is oversized: the router sends an ICMP message
back to the sender. When this parameter is Yes, the DF bit is ignored, the packet
is fragmented, and no message is sent back to the sender.
NAT Does not apply to Expanded NAT. Determines the type of IP address if NAT is
being used. Use
Global
otherwise. See chapter 11 or the examples in chapter 4
for details on how to configure NAT.
ICMP Port
Active
causes the router to send ICMP Port Unreachable messages when it
receives UDP or TCP messages for ports that are not recognized. This type of
message is used by some traceroute applications, and if disabled, the router might
not be identified in the traceroute output. However, there are security and
performance reasons to leave this option
Inactive
.
Incoming Rule List Filter rule list for incoming packets. See chapter 12 for instructions on how this
parameter should be set.
Detailed Incoming IP
Accounting
Applies when a list is selected in the previous parameter. See explanation of IP
Accounting later in this chapter. IP Accounting for a rule requires that the
parameter CONFIG =>RULES LIST=>IP=>CONFIGURE RULES=>ADD RULE
=>ALLOW ACCOUNT PROCESS also be
Yes
.
Outgoing Rule List Name Filter rule list for outgoing packets. See chapter 12 for instructions on how this
parameter should be set.
Detailed Outgoing IP
Accounting
Applies when a list is selected in the previous parameter. See explanation of
Detailed Incoming IP Accounting
.
Routing of Broadcast
Messages
Activating this parameter causes the router to route broadcast messages from the
LAN to the WAN and vice-versa. An individual interface can be excluded by setting
this parameter to
Inactive
, without affecting the broadcast of messages on the other
interfaces.