Defines starting with `r' in netinet

• REDUCE netinet/in_cksum.c:47
• RIPRCVQ netinet/raw_ip.c:61
• RIPSNDQ netinet/raw_ip.c:60
• rt_expire netinet/if_ether.c:78
• RTF_ANNOUNCE netinet/if_ether.h:137
• RTF_USETRAILERS netinet/if_ether.h:136