text: #ifndef _SQUID_SRC_IP_TOOLS_H
  #define _SQUID_SRC_IP_TOOLS_H
  
  namespace Ip
  {
  
  /// Probe to discover IPv6 capabilities
  void ProbeTransport(void);
  
  /* Squids notion of IPv6 stack types and state */
  #define IPV6_OFF  0
  #define IPV6_ON   1
  #define IPV6_SPECIAL_V4MAPPING  2
  #define IPV6_SPECIAL_SPLITSTACK 4
  
  /// Whether IPv6 is supported and type of support.
  extern int EnableIpv6;
  
  } // namespace Ip
  
  #endif /* _SQUID_SRC_IP_TOOLS_H */
  