7-10 Administrator’s Handbook
On a Motorola Netopia® router, every interface will be allowed to have up to two keys.
Key management
Typically, you configure only one key on a given interface and all of the interfaces that interact with that interface. RIP updates are sent every 30 seconds. Each RIP packet is authenticated using one key and sent. When the Motorola Netopia® router receives an authenticated RIP packet from a device, it keeps track of that device (peer).
The longer it is in use, a single key becomes less secure. Therefore, RFC2082 specifies that an interface must support at least two keys per interface to allow a transition from an old key to a new key. It is recommended that you specify an overlapping time of five minutes for transitioning from one key to the next. Whenever two keys are valid at the same time, the Motorola Netopia® router tries to determine if other peers (devices that it has received an authenticated packet from in the past three minutes) on its network are using the new key. If any of the peers have not used the new key yet, the Motorola Netopia® router will send RIP updates twice, once with each key.
If the last valid key expires, the Device Event History logs a “* RIP: last authentication key expired” message, and continues to use that key as if it were still valid.
Authentication configuration
To configure
Main
Menu
The IP Setup screen appears.
System Configuration
IP Setup
IP Setup |
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Ethernet IP Address: | 192.168.1.1 |
Ethernet Subnet Mask: | 255.255.255.0 |
Define Additional Subnets... |
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Default IP Gateway: | 0.0.0.0 |
Backup IP Gateway: | 0.0.0.0 |
Primary Domain Name Server: | 0.0.0.0 |
Secondary Domain Name Server: | 0.0.0.0 |
Domain Name: |
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Rip Options... |
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Proxy Arp Enabled: | No |
Multicast Forwarding... | None |
VRRP Options... |
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Static Routes... | IP Address Serving... |
Additional LANs... |
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Enter an IP address in decimal and dot form (xxx.xxx.xxx.xxx). Set up the basic IP attributes of your Netopia in this screen.
