If the firewall is running the internal or external name service, additional records can be added to the DNS files if needed (Table 7.4). Usually the only time this might be needed is for adding MX records to the internal name server, or serving additional domains with the internal name server. To do this, you should put the necessary extensions to the named.boot file in the file /usr/local/custom/named.boot.inside. You will need to add db.domain.inside files to the /etc/namedb.in directory for the additional domains, as well as add the necessary reverse records to the appropriate files in /usr/local/custom (use the same file names as the files you wish to extend in /etc/namedb.in. Finally, you will need to tell the splitdns proxy that there are additional internal domains, so that it forwards requests for addresses in these domains to the internal server. At present this must be done by hand-editing the /etc/cequrux.cfg file, and adding lines of the form `idomain <domain>'.
