Predefining variables and how iRules work

You can build string or address classes, and they can be stored in the bigip.conf file, or externally in the profile_base.conf file. See:

 

 

bigpipe class help

 

 

No idea on the 2nd question. My understanding is that the rules are in memory once loaded (in fact, some rule fragments that are deleted require a bigstart restart to completely remove them from memory) and that many of the features in the profiles are compiled, and thus, highly optimized, iRules (as explained by one of the ENE's).

 

 

Some examples from profile_base.conf

 

 

This is a pre-defined class identifying common image file extensions

 

class images {

 

".jpg"

 

".gif"

 

".bmp"

 

}

 

 

This is a pre-defined class identifying private network addresses.

 

class private_net {

 

network 10.0.0.0 mask 255.0.0.0

 

network 172.16.0.0 mask 255.240.0.0

 

network 192.168.0.0 mask 255.255.0.0

 

}