Issues with Table Lookup command

You can verify if the table lookup is returning anything by adding a simple logging line:

if {[table lookup -notouch $l7table] eq "" } {
    table set $l7table 1 3
} else {
    log local0. "Table lookup:[table lookup -notouch $l7table]"
    table incr -notouch $l7table
}

With regards to your comment about which type of equals to use, TCL doesn't distinguish between variable types, everything is a string. How you use an operator is key. For example 'eq' will always compare two strings whereas '==' is polymorphic, it will decide which type is appropriate and convert the variable if required. This can have a performance impact so best practice is to have a good idea about the data you are interrogating and write code appropriately. You can read more about this here:

Polymorphism - Making TCL operators work for you.

But in a nutshell, using eq or == should have the same result, one may be more expensive than the other depending on the type of variable be interrogated.

Lee