AAA, NAC, Guest Access & BYOD

Use Regular expression while adding static host list on CPPM with IP address

Aruba Employee

This article talks about adding Static Host List with IP address in form of a regular expression.

 

We can add a static host list on CPPM by navigating to Configuration » Identity » Static Host Lists.

 

 

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Tips about writing a regular expression.


IP Addresses have a particular form.

number.number.number.number

 

Where the number can be pretty much any number from 0 to 255.

Valid  :  1.2.3.4    10.10.10.10   230.245.250.131
Invalid: 1023.10.1.2    256.1.2.3    230.245.270.131


Lets note the immediate observations:

    a: 4 numbers, each separated by a single dot
    b: 3 dots in total
    c: each number can be from 1 to 3 digits in length
    d: each number can be from 0 to 255

The base solution would be

 

.*\..*\..*\..*


Improvising it we would get

[0-9]|[0-9][0-9]|[0-9][0-9][0-9]


    This means that we may have

     A single digit: [0-9]
               OR
    1 or 2 or 3 digits?

Better way to write the same would be :  [0-9]{1,3} where items with curly brackets: {min,max}


So the complete IP would be

[0-9]{1,3} \. [0-9]{1,3} \. [0-9]{1,3} \. [0-9]{1,3}

But the above solution is very generic and would allow invalid IPs like 999.999.999.999 also. This is just a base line solution for IP address.

Below is a Real Example.

Allowed IP Range is :  192.18.0.0 - 192.19.31.255


Break down of Range

192.18.
192.19.0 to 31.

and

192.19.[0-9].
192.19.1[0-9].
192.19.2[0-9].
192.19.30.
192.19.31.


Combining both we can write en expression as below.

^
192\.
 (
   18\.
    |
   19\.
      (
         [0-9]\.
         |
         1[0-9]\.
         |
         2[0-9]\.
         |
         30\.
         |
         31\.
      )
  )



We can remove a few "\" and re-write the expression as shown below.

^192\.
  (
     18\.|
     19\.
        (
          [0-9]|1[0-9]|2[0-9]|30|31
         )
         \.
   )

 

Version history
Revision #:
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Last update:
‎07-11-2014 03:45 PM
Updated by:
 
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