LTM create unique request IDs?

We discussed having LTM generate a unique request ID here using rand or AES::key:

 

 

http://devcentral.f5.com/Community/GroupDetails/tabid/1082223/aff/5/afv/topic/aft/2163201/afc/2263687/Default.aspx

 

 

Here are two options. The rand option should be more efficient but not cryptographically secure. You can compare the CPU usage using the timing command.

 

 

Use rand() to generate a psuedo-random 8 digit number (not cryptographically secure)

 

format %010s expr [{ int(100000000 * rand()) }]

 

 

Use AES::key to generate a cryptographically secure unique ID

 

set uid [string range [AES::key 256] 8 end]

 

 

Use timing to do a performance comparison:

 

https://devcentral.f5.com/wiki/iRules.timing.ashx

 

 

Aaron