Personalities Example: UDP packet for AIX 4.0: Fingerprint AIX 4.0 - 4.2 PU(DF=N%TOS=0%IPLEN=38%RIPTL=15C%RID=E%RIPCK=F%UCK=E%ULEN=134%DAT=E) For a closed UDP port, Honeyd generates an ICMP Port Unreachable Message quoting the received IP packet. Personality engine changes certain fields: Byte order of certain fields may be flipped to host order. Data length may change. Corruption of quoted data may be inserted..