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I'm using tcpdump and tcpreplay in ubuntu for capturing packet and resending(with rewriting and openwrt for ap mode in raspberry pi.

My problem is that I cannot capture resent packet.

This is my network :

     A          ---->        B(RPI)           ----------->     C
192.168.0.199      eth0.          wlan0      |             192.168.2.172
               192.168.0.100    192.168.2.1  | 
                                              ------------>     D
                                                           192.168.2.222

I sent packet(using nping) from A to B, and used portforwarding

nping in A :

nping --udp --dest-port 7777 --dest-ip 192.168.0.100

portforwarding in B using iptables :

iptables -t nat -A PREROUTING -i eth0 --dport 7777 -j DNAT --to 192.168.2.222

So, I done here.

And I write this in D

tcpdump -i wlan0 dst port 7777 -w packet.pcap
tcprewrite -i packet.pcap -o packet_rewrite.pcap -D 192.168.2.222:192.168.2.172
tcpreplay -i wlan0 --topspeed packet_rewrite.pcap

But, in C, I cannot capture modified packet...

tcpdump dst port 7777

I really want to know why i can't...please let me know
and i'm really sorry my explain is not good....

David Brossard
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YoonPD
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1 Answers1

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further search.. I captured packets in B (wlan0) Because i edited packet's source mac to my ubuntu wlan mac address... But as before, I cannot capture packets in C... This is captured packets in B

and even replayed packet didn't pass iptables...

I solved!!!!!!!!!!!!!!

I had to change dmac to C's mac address....I was stupid....

YoonPD
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