Problems with portscan

[Gmail <foringer () gmail com>]

Hello List!
I'm having problems with scanner/portscan/syn auxiliary module. The
problems begins when I set up INTERFACE option to the "eth1" value.

During scan I set up tcpdump on another console and got such output:

arp who-has 192.168.20.2 tell 77.83.70.51
arp who-has 192.168.20.3 tell 77.83.70.51
arp who-has 192.168.20.4 tell 77.83.70.51
arp who-has 192.168.20.5 tell 77.83.70.51
arp who-has 192.168.20.6 tell 77.83.70.51

I'm scanning 192.168.20.0/24 network and machine with metasploit does
not have any external ip-address or connection to the internet.
IP-address 77.83.70.51 does not belongs to my IPS.
I'm reciving such errors in the msfconsole:
[-] Error: #<Class:0xb54d7410> execution expired

For my work I'm using Backtrack 4.

So, is it a bug or maybe I need to tune some configurations for my
machine?

Thanks...

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