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8 - 20 WiNG 5.7.1 Access Point System Reference Guide
8. Select Add as needed to add additional IP Firewall Rule configurations. Select the Remove icon as required to remove
selected IP Firewall Rules.
9. Select OK when completed to update the IP Firewall rules. Select Reset to revert back to the last saved configuration.
8.2.2 Setting an IP SNMP ACL Policy
SNMP performs network management functions using a data structure called a
Management Information Base
(MIB). SNMP
is widely implemented but not very secure, since it uses only text community strings for accessing controller or service platform
configuration files.
Use SNMP ACLs to help reduce SNMP’s vulnerabilities, as SNMP traffic can be exploited to produce a denial of service (DoS).
To create an IP SNMP ACL:
1. Select
Configuration
>
Security
>
IP Firewall.
2. Expand the
IP Firewall
menu item and select
IP SNMP ACL
.
ICMP Type
Selecting ICMP as the protocol for the IP rule displays an additional set of ICMP specific
options for ICMP type and code. The
Internet Control Message Protocol
(ICMP) uses
messages identified by numeric type. ICMP messages are used for packet flow control or
generated in IP error responses. ICMP errors are directed to the source IP address of the
originating packet. Assign an ICMP type from 1-10.
ICMP Code
Selecting ICMP as the protocol for the IP rule displays an additional set of ICMP specific
options for ICMP type and code. Many ICMP types have a corresponding code, helpful for
troubleshooting network issues (
0 - Net Unreachable
,
1- Host Unreachable
,
2 - Protocol
Unreachable etc.).
Start VLAN
Select a Start VLAN icon within a table row to set (apply) a start VLAN range for this IP
ACL filter. The Start VLAN represents the virtual LAN beginning numeric identifier arriving
packets must adhere to in order to have the IP ACL rules apply.
End VLAN
Select an End VLAN icon within a table row to set (apply) an end VLAN range for this IP
ACL filter. The End VLAN represents the virtual LAN end numeric identifier arriving
packets must adhere to in order to have the IP ACL rules apply.
Protocol
Select the protocol to filter for this ACL. Use the drop down to select from a list of
predefined protocol or use the spinner control to set a particular protocol number.
Mark
Select this option to mark certain fields inside a packet before allowing them. Mark is only
applicable for
Allow
rules. Mark sets the rule’s 802.1p or dscp level (from 0 - 7).
Log
Select this option to create a log entry that a firewall rule has allowed a packet to be
either denied or allowed.
Enable
Select this option to enable or disable this particular IP Firewall rule in this rule set.
Description
Lists the administrator assigned description applied to the IP ACL rule. Select a
description within the table to modify its character string as filtering changes warrant.
Select the icon within the Description table header to launch a Select Columns screen
used to add or remove IP ACL criteria from the table.
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