- ip/optionsconstant
- ip/hdrinclconstant
- ip/tosconstant
- ip/ttlconstant
- ip/mtuconstant
- ip/mtu-discoverconstant
- ip/pktinfoconstant
- ip/recverrconstant
- ip/recvtosconstant
- ip/recvttlconstant
- ip/router-alertconstant
- ip/recvoptsconstant
- ip/recvretoptsconstant
- ip/retoptsconstant
- ip/recvdstaddrconstant
- ip/multicast-ifconstant
- ip/multicast-ttlconstant
- ip/multicast-loopconstant
- ip/add-membershipconstant
- ip/drop-membershipconstant
IP-level socket options for use with set-socket-option and get-socket-option at level ipproto/ip.