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When you changed arp.c above, did you recompiled dsniff like you did the first time??
I.E:
./configure&&make&&make install

Yes Fragroute should forward all your traffic.

Also, the -i should work. But there was a problem with a few version that even doing -i wlan or -i ath0 wouldnt work. In that case you actually need...

You need to edit the arp.c source. There is a function arp_cache_lookup that won't use the correct interface. So in arp.c you need to change:


strncpy(ar.arp_dev, "eth0", sizeof(ar.arp_dev));
...

Oh, and Also try arp spoofing the entire network and don't specify the target. I would be curious if you get the same results

Wait, i noticed you said ath0 is that your wireless interface? and if so is it in monitor or managed mode.

Did you set up ip forwarding?

echo 1 > /proc/sys/net/ipv4/ip_forward