Personalities Example: SYN packet for AIX 4.0: Fingerprint AIX 4.0 - 4.2 TSeq(Class=64K) T1(DF=N%W=7F53|3F25%ACK=S++%Flags=AS%Ops=M) Honeyd generates SYN|ACK packet. Personality engine fills in certain fields: Sequence number. Subsequent numbers have 64k difference. Adjust window size to 0x7f53. Insert MSS option. Sequence number generation most difficult. Random increments difficult to emulate.