[Winpcap-users] ARP problem, works with XP but not with Vista..

Gianluca Varenni gianluca.varenni at cacetech.com
Tue Apr 21 13:47:36 PDT 2009

Do you see *any* packet with windump? Your machine has IP, 
which is an automatic address i.e. it's assigned to your NIC when it's 
supposed to get an address from a DHCP server, but it failed to obtain such 
address. In that case it configures an automatic address, but no default 
gateway. And with no default gateway you cannot send a packet to 
with the normal sockets, because there is no route to that destination.

Have a nice day

----- Original Message ----- 
From: "Janne Heikkinen" <janne.m.heikkinen at helsinki.fi>
To: <winpcap-users at winpcap.org>
Sent: Friday, April 17, 2009 7:45 AM
Subject: [Winpcap-users] ARP problem, works with XP but not with Vista..

> I have application running on XP and I have added IP address
> manually with arp command like this:
>   arp -s aa-cd-ef-12-34-56
> Now when the application sends UDP packet to that IP address
> I see it with WinDump.
> But when I try the same application under Vista I don't see anything
> with WinDump.
> Running "arp -a" gives about the interface in question:
>   Interface: --- 0x10
>     Internet Address      Physical Address      Type
>           aa-cd-ef-12-34-56     static
>       ff-ff-ff-ff-ff-ff     static
>            01-00-5e-00-00-16     static
>           01-00-5e-00-00-fc     static
>       01-00-5e-7f-ff-fa     static
>       ff-ff-ff-ff-ff-ff     static
> And the application is certainly using interface
> to send to destination
> - Janne
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