This daemon runs the RIP routing protocol. Alternative routing daemon to rip. Has OSPF routing protocol, EGP, and RIP all under same roof. Public domain utility. PSU has it.
Root can add and delete arp entries.
Deleting them can be useful if an arp entry is malformed or just wrong. The arp table is stored in the kernel and manipulated dynamically. Arp entries are cached and will time out and be deleted normally in 20 minutes. See man page for details. PSU has it.