Configuring the Device to Process IP Packets with Options
Context
IP packets can carry route options including the route alert option, route record option, source route option, and timestamp option. These route options are used to diagnose network paths and temporarily transmit special services. These options, however, may be used by attackers to spy on the network structure for initiating attacks. This degrades network security and device performance. To solve this problem, you can perform the following configurations to configure the device to discard the IP packets that contain the route options.
Procedure
- Configure the device to process IP packets with options
in the system view or interface view:
Enter the system view.
Run system-view
The system view is displayed.
Enter the interface view.
Run system-view
The system view is displayed.
Run interface interface-type interface-number
The interface view is displayed.
On an Ethernet interface, run undo portswitch
The interface is switched to Layer 3 mode.
By default, an Ethernet interface works in Layer 2 mode.
The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.
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NOTE: If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.
- Do as follows according to different route options in IP
packets:
Run ip option route-alert disable
The system is disabled from processing the IP packets carrying route alert options.
Run ip option route-record disable
The system is disabled from processing the IP packets carrying record route options.
Run ip option source-route disable
The system is disabled from processing the IP packets carrying source route options.
Run ip option time-stamp disable
The system is disabled from processing the IP packets carrying timestamp options.
By default, the system is enabled to process the IP packets carrying route options.
- Run commit
The configuration is committed.
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