Re: [lwip-users] how to handle ARP request that's not for me

[dogeye]

    Sorry for the confusion.
    From 1 to 5 is a series of actions to demonstrate one problem.
Device A is using lwip and server is a normal server, say, SIP server.
    Correct me if I'm wrong, from what I see, lwip update its ARP
table with all incoming request no matter if the requested IP is for
itself or not, that's why I say #3 will happen.


On Tue, Feb 17, 2009 at 2:39 PM, Leon Woestenberg
<address@hidden> wrote:
> Hello,
>
> On Tue, Feb 17, 2009 at 7:54 PM, dogeye <address@hidden> wrote:
>> so how about this situation:
>> 1. a device, A,  in a network using static IP for a while already, so
>> it and the server knows each other's MAC.
>> 2. device A changed its Ethernet card and keeps it's static IP. Then
>> later server sends out an ARP request for an IP other than A's
>> 3. in current implementation of lwip, A uses this ARP request to
>> update its own table.
>> 4. when A sends a message to server, it doesn't send out ARP request
>> because it has server's MAC in its table already.
>> 5. Therefore, server still has the old IP and MAC pair in its table,
>> and it will cause problem until current entry expires.
>>
> Sorry, I do not follow you, first two questions:
>
> Server does not run lwIP in your explanation?
> device A runs lwIP?
>
> I do not see how 3 should happen.
>
> Regards,
> --
> Leon
>
>
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