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Re: [lwip-users] OT: Windows blocking receive broadcasts
From: |
Kieran Mansley |
Subject: |
Re: [lwip-users] OT: Windows blocking receive broadcasts |
Date: |
Tue, 21 Dec 2010 19:32:13 +0000 |
On 21 Dec 2010, at 19:24, Bill Auerbach wrote:
> I just ran into something. A customer programmed a “bad” static IP address
> in his lwIP-based device. My ipconfig utility broadcasts a “who’s there” UDP
> message and is broadcasted back from the lwIP device the “here I am” packet.
> The problem is, with the bad IP address as the source, Windows will not send
> the packet to the program. But, Wireshark does show both broadcasts. Tthe
> user is not sure what was entered, I can make it happen if I set the lwIP
> device to 250.168.1.1. I know it’s in the unicast range, but why is this
> effecting broadcasts? Going forward we will better error check the static
> address that the user enters, but is this broadcast filtering expected?
I would guess that Windows is comparing the broadcast address being used to its
own interface configuration and deciding that this is a broadcast on a
different IP network, so it drops it.
Kieran