Re: [lwip-users] Communication between different subnets

[hellish]

Thanks for clearing up the IP destination confusion! Sure, I'll use wireshark
to capture some packets tomorrow.
Then again, I remember doing this yesterday and wireshark didn't see any
packet (from my board to FTP server), hmm....


Kieran Mansley wrote:
> 
> On Tue, 2010-09-14 at 02:04 -0700, hellish wrote:
>>  * For unicast addresses, the packet is submitted to etharp_query().
>> In
>>  * case the IP address is outside the local network, the IP address of
>>  * the gateway is used.
>>    So lwip modified destination IP address of the packets(sent from my
>> board) to that of the gateway?  This confused me. Why change the
>> destination
>> IP address? According to my network textbook, it is the destination
>> MAC
>> address that should be changed to that of the gateway.
> 
> Yes, your textbook is right.  But to find the MAC address of the gateway
> we have to use the IP address of the gateway in the lookup.  The packet
> itself will still be sent with the IP address of the FTP server.
> 
> It should just work if you've configured the netif with the gateway
> address properly.
> 
> Can you get a packet capture to show what's going wrong.  You've said it
> doesn't work but we need more information about what goes wrong to debug
> this problem.
> 
> Kieran
> 
> 
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> 

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