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I'm doing a ARP Spoofing MITM attack like this:

arpspoof -i wlan0 -t 192.168.1.112 192.168.1.1 -r

And I can see the traffic from the target (192.168.1.112) showing up in the sniffer, but the target is never getting any responses back, leading to a DoS for the target instead of a subtle sniffing attack.

I have ip forwarding turned on:

root@kali:~/network-hacking-scripts# cat /proc/sys/net/ipv4/ip_forward
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And I have no firewall rules on:

root@kali:~/network-hacking-scripts# iptables-save
root@kali:~/network-hacking-scripts# 

I'm running on the latest version of Kali Linux (2016.1). It's running in VirtualBox inside an OS X host. I'm using a TP-LINK TL-WN722N external wireless adapter for Kali.

Any thoughts on why the traffic forwarding is not working?

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Figured it out! When I brought eth0 down like this:

ifconfig eth0 down

traffic forwarding started working.

I think what was happening was the traffic was being forwarded from wlan0 (the external wireless card) to eth0.

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