Scapy would be a good answer:

Welcome to Scapy (1.2.0.2)

>>> ans, unans = sr(IP(dst="192.168.1.1")/TCP(dport=[80],sport=[1,2,3,4,5,6]))

Begin emission:

...*.*.*.Finished to send 6 packets.

*.*.*

Received 14 packets, got 6 answers, remaining 0 packets

>>> ans.summary()

IP / TCP 192.168.1.137:tcpmux > 192.168.1.1:http S ==> IP / TCP 192.168.1.1:http > 192.168.1.137:tcpmux RA

IP / TCP 192.168.1.137:2 > 192.168.1.1:http S ==> IP / TCP 192.168.1.1:http > 192.168.1.137:2 RA

IP / TCP 192.168.1.137:compressnet > 192.168.1.1:http S ==> IP / TCP 192.168.1.1:http > 192.168.1.137:compressnet RA

IP / TCP 192.168.1.137:4 > 192.168.1.1:http S ==> IP / TCP 192.168.1.1:http > 192.168.1.137:4 RA

IP / TCP 192.168.1.137:rje > 192.168.1.1:http S ==> IP / TCP 192.168.1.1:http > 192.168.1.137:rje RA

IP / TCP 192.168.1.137:6 > 192.168.1.1:http S ==> IP / TCP 192.168.1.1:http > 192.168.1.137:6 RA

>>>

http://enablesecurity.com/

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