HP ProCurve W.14.03 Additional Examples for Authorizing Multiple Stations

Using Authorized IP Managers

Building IP Masks

Table 14-3. Example of How the Bitmap in the IP Mask Defines Authorized Manager Addresses

4th Octet of IP Mask: 249

4th Octet of Authorized IP Address: 5

Bit Numbers	Bit		Bit		Bit		Bit		Bit	Bit		Bit		Bit
	7	6		5		4		3		2	1		0
Bit Values	128	64		32		16		8		4	2		1
4th Octet of
IP Mask (249)
4th Octet of
IPAuthorized
Address (125)

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.

Additional Examples for Authorizing Multiple Stations

	Entries for Authorized				Results
	Manager List
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
					fourth octet of the station’s IP address.
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
Manager IP

14-12