Correcting a Misconfigured Access List

Appendix E Troubleshooting

Troubleshooting the Appliance

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•For the procedures for changing the IP address, changing the access list, and enabling and disabling Telnet, refer to Configuring Network Settings.

•For the various ways to open a CLI session directly on the sensor, see Appendix A, “Logging In to the Sensor.”

To correct a misconfigured access list, follow these steps:

Step 1 Log in to the CLI.

Step 2 View your configuration to see the access list.

sensor# show configuration include access-list

access-list 10.0.0.0/8 access-list 64.0.0.0/8 sensor#

Step 3 Verify that the client IP address is listed in the allowed networks. If it is not, add it.

sensor# configure terminal sensor(config)# service host sensor(config-hos)# network-settingssensor(config-hos-net)# access-list 171.69.70.0/24

Step 4 Verify the settings.

sensor(config-hos-net)# show settings network-settings

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host-ip: 192.168.1.2/24,192.168.1.1 default: 10.1.9.201/24,10.1.9.1

host-name: sensor-238 default: sensor

telnet-option: enabled default: disabled

access-list (min: 0, max: 512, current: 3)

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network-address: 10.0.0.0/8

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network-address: 64.0.0.0/8

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network-address: 171.69.70.0/24

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ftp-timeout: 300 seconds <defaulted>

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sensor(config-hos-net)#

Duplicate IP Address Shuts Interface Down

If you have two newly imaged sensors with the same IP address that come up on the same network at the same time, the interface shuts down. Linux prevents the command and control interface from activating if it detects an address conflict with another host.

	Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.1
E-26	OL-24002-01

IPS4520K9 specifications

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Cisco Systems IPS4520K9 manual Correcting a Misconfigured Access List

Models: IPS4520K9

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