little problem with nat , resending packets to wrong destination.

Hi the last day a notice a extrange thing with my packetsniffer one host recive a packet that i request from the linux "router"

Network:

-----ppp0 modem-- [Linux router]eth0------[Honneypot]---

			192.168.1.2	  192.168.1.56

i have 2 rules in iptables

iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE iptables -t nat -A PREROUTING --in-interface ppp0 --protocol tcp --destination-port ! ssh --jump DNAT --to-destination 192.168.1.5

I usaly use the linux router to work and the honneypot to fun & profit.

i always exeute tcpdump -i eth0 -s 9000 -w LOGFILE on the router machine.

The last day when im making a revision of the log , i discover that in the log i could raead a "response" of an http request that i do from router linux ( i make a the request to external site over ppp connection).

|---|
unfornatly i only have the snoop of the ppp0 interface.

80.34.69.xxx = external server

1) i make http request to 80.34.69.xxx server
2) i read the web contents correctly
3) aparently the kernel forward the response to 192.168.1.56 (honeypot)

#tcpdump -r JAULA6 -n 'tcp port 80 && host 80.34.69.xxx'

03:28:03.303637 80.34.69.xxx.80 > 192.168.1.56.33352: . 3888813151:3888814599(1448) ack 2877177511 win 6710 <nop,nop,timestamp 110497018 7927497> (DF)
03:28:03.304382 192.168.1.56.33352 > 80.34.69.xxx.80: R 2877177511:2877177511(0) win 0

#tcpdump -r JAULA6 -n 'tcp port 3000 && host 80.34.69.xxx'

03:17:04.803886 80.34.69.xxx.3000 > 192.168.1.56.33329: P 3209289308:3209289324(16) ack 2224478666 win 6720 <nop,nop,timestamp 110431569 7862787> (DF)
03:17:04.804585 192.168.1.56.33329 > 80.34.69.xxx.3000: R 2224478666:2224478666(0) win 0

In the 2 case the honneypot respond with rst because he dont start the conexion.

This happend rarely only 2 times in 1 day :|

Bye!