Name

       xt_asn_build — convert ASN.csv to packed format for xt_asn

Syntax

       /usr/libexec/xt_asn/xt_asn_build [-D target_dir] [-S source_dir] [-O output_file]

Description

       xt_asn_build  is  used  to build packed raw representations of the range database that the
       xt_asn module relies on. Since kernel memory is precious, much  of  the  preprocessing  is
       done  in  userspace  by this very building tool. One file is produced for each country, so
       that no more addresses than needed are required to be loaded into memory.  The  ranges  in
       the  packed  database  files  are  also ordered, as xt_asn relies on this property for its
       bisection approach to work.

       Since the script is usually installed to  the  libexec  directory  of  the  xtables-addons
       package  and  this  is  outside  $PATH (on purpose), invoking the script requires it to be
       called with a path.

       -D target_dir
              Specifies the target directory into which the files are to be put. Defaults to ".".

       -S source_dir
              Specifies the source directory from which to read the two  files  by  the  name  of
              GeoLite2-ASN-Blocks-IPv?.csv,

       -O output_file
              Specifies  an  optioan  target file to output DNS records for ASN to name (TXT-RRs)
              and network  (APL-RRs).   Defaults  to  no  output.   The  file  should  be  sorted
              postprocessing  to  remove duplicate TXT records and to combine APL-RRs into a more
              compact record set.

Application

       Shell commands to build the databases and put them to where they are expected:

       xt_asn_build -D /usr/share/xt_asn

See also

       xt_asn_dl(1)