<!-- include start from accel-ppp/ppp-options-ipv6.xml.i --> <leafNode name="ipv6"> <properties> <help>IPv6 (IPCP6) negotiation algorithm</help> <constraint> <regex>(deny|allow|prefer|require)</regex> </constraint> <constraintErrorMessage>invalid value</constraintErrorMessage> <valueHelp> <format>deny</format> <description>Do not negotiate IPv6</description> </valueHelp> <valueHelp> <format>allow</format> <description>Negotiate IPv6 only if client requests</description> </valueHelp> <valueHelp> <format>prefer</format> <description>Ask client for IPv6 negotiation, do not fail if it rejects</description> </valueHelp> <valueHelp> <format>require</format> <description>Require IPv6 negotiation</description> </valueHelp> <completionHelp> <list>deny allow prefer require</list> </completionHelp> </properties> <defaultValue>deny</defaultValue> </leafNode> <!-- include end -->