Phantom traffic in IPTraffic

What steps will reproduce the problem?
1. Enable IP traffic

What is the expected output? What do you see instead?
See only delivered traffic (or maybe routed traffic, some protocols have no ACK)

What version of the product are you using? On what operating system?
Tomato-Teaman-ND-USB-SDHC-VLAN-VPN-PPTPD v0023
Same problem on toastman's builds (Do you guys pretty much share the same 
codebase? New features on one side aren't long to make it the other)

Please provide any additional information below.

After a couple of weeks, the ip traffic graph shows approximately 42 IP 
addresses. At first I was puzzled, but after further investigation I detected 
traffic destined to these addresses coming from my desktop. Reasons for such 
bogus traffic are irrelevant, but I confirm that addresses are not present in 
ARP table nor in DHCP table and never were.

Because the IP isn't present in the ARP table, and thus not switched/delivered, 
traffic shouldn't be counted.

Original issue reported on code.google.com by decoy113...@gmail.com on 23 Mar 2012 at 6:15

Merged into: #7

iBabajan / tomato-sdhc-vlan

Phantom traffic in IPTraffic #16