Which enviornment varible specifies additional directories to search for library files not listed in /etc/ld. so/conf?

LD_LIBRARY_PATH

Explanation:

In Linux operating system the LD_LIBRARY_PATH is a environment variable for search path and it specifies the set of directories separated by colon (:) that library files are searched for before the standard set of directories. it specifies additional directories to file search for library files not listed in /etc/ld.so/conf.

answer inspecting packets in isolation from their context;