- <literal>fticksVISCOUNTRY</literal>, <literal>fticksVISINST</literal>,
- <literal>rewrite</literal>, <literal>rewriteIn</literal>,
- <literal>rewriteOut</literal>, and <literal>rewriteAttribute</literal>.
+ <literal>fticksVISCOUNTRY</literal>,
+ <literal>fticksVISINST</literal>, <literal>rewrite</literal>,
+ <literal>rewriteIn</literal>, <literal>rewriteOut</literal>, and
+ <literal>rewriteAttribute</literal>.
+
+ We already discussed the <literal>host</literal> option. To
+ specify how radsecproxy should resolve a <literal>host</literal>
+ given as a DNS name, the <literal>IPv4Only</literal> or the
+ <literal>IPv6Only</literal> can be set to <literal>on</literal>.
+ At most one of these options can be enabled. Enabling
+ <literal>IPv4Only</literal> or <literal>IPv6Only</literal> here
+ overrides any basic settings set at the top level.