![](/images/backgrounds/285757/hp-procurve-2600-series-users-manual-550038297x1.png)
Using Authorized IP Managers
Building IP Masks
4th Octet of IP Mask: | 249 |
4th Octet of Authorized IP Address: 5
Bit Numbers | Bit |
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| Bit | Bit | |
| 7 | 6 | 5 | 4 | 3 | 2 | 1 |
| 0 | ||||||
Bit Values | 128 | 64 | 32 | 16 | 8 | 4 | 2 |
| 1 | ||||||
4th Octet of |
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IP Mask (249) |
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4th Octet of |
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IPAuthorized |
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Address (125) |
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Bits 1 and 2 in the mask are “off”, and bits 0 and 3 - 7 are “on”, creating a value of 249 in the 4th octet.
Where a mask bit is “on”, the corresponding bit setting in the address of a potentially authorized station must match the IP Authorized Address setting for that same bit. Where a mask bit is “off” the corresponding bit setting in the address can be either “on” or “off”. In this example, in order for a station to be authorized to access the switch:
•The first three octets of the station’s IP address must match the Authorized IP Address.
•Bit 0 and Bits 3 through 6 of the 4th octet in the station’s address must be “on” (value = 1).
•Bit 7 of the 4th octet in the station’s address must be “off” (value = 0).
•Bits 1 and 2 can be either “on” or “off”.
This means that stations with the IP address 13.28.227.X (where X is 121, 123, 125, or 127) are authorized.
Figure
Additional Examples for Authorizing Multiple Stations
| Entries for Authorized | Results | ||||
| Manager List |
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IP Mask | 255 | 255 | 0 | 255 | This combination specifies an authorized IP address of 10.33.xxx.1. It could be | |
Authorized | 10 | 33 | 248 | 1 | applied, for example, to a subnetted network where each subnet is defined by the | |
third octet and includes a management station defined by the value of “1” in the | ||||||
Manager IP |
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| fourth octet of the station’s IP address. | ||
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IP Mask | 255 | 238 | 255 | 250 | Allows 230, 231, 246, and 247 in the 2nd octet, and 194, 195, 198, 199 in the 4th octet. | |
Authorized | 10 | 247 | 100 | 195 |
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Manager IP |
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