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

[Gianluca Varenni]

Do you see *any* packet with windump? Your machine has IP 169.254.45.253, 
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 10.68.23.47 
with the normal sockets, because there is no route to that destination.

Have a nice day
GV


----- 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 10.68.23.47 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: 169.254.45.253 --- 0x10
>     Internet Address      Physical Address      Type
>     10.68.23.47           aa-cd-ef-12-34-56     static
>     169.254.255.255       ff-ff-ff-ff-ff-ff     static
>     224.0.0.22            01-00-5e-00-00-16     static
>     224.0.0.252           01-00-5e-00-00-fc     static
>     239.255.255.250       01-00-5e-7f-ff-fa     static
>     255.255.255.255       ff-ff-ff-ff-ff-ff     static
>
> And the application is certainly using interface 169.254.45.253
> to send to destination 10.68.23.47.
>
> - Janne
>
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