ICMP Router Discovery Protocol IRDP <protocol> (IRDP) A {routing} {protocol} used by {Microsoft Windows} {DHCP} clients and various {Unix} flavors. Vulnerability (http://securiteam.com/securitynews/Most_DHCP_clients_are_vulnerable_to_an_IRDP_attack.html). [Details? Reference?] (1999-10-31)