Re: [lwip-users] TCP retransmission

[address@hidden]

Nikolas Karakotas wrote:
> I'm facing an issue on-site where there is quite a lot of traffic.
> Sometimes I can see from the log that we have a TCP re-transmission
> and we once the packet is re transmitted the data we receive is
> impartial. As a result our modbus driver responds with and error.
> I can see that the the modbus header is partial correct but the rest
> is junk. This is very difficult to reproduce but some insight may help
> me to find the issue. So do you believe it's an issue with the:

If you really want help, you'll at least have to attach a packet trace 
file, not some image.
Also, explain which communication we see in that file (explain IPs, 
connections, applications, etc).
Plus, tell us exactly which packet you seem is wrong. All that makes it 
much easier to have a quick look and maybe see something. From the 
picture you sent, I can see just about nothing.

> 1. Ethernet driver
> 2. Application layer dealing with fragmented packet

Ah, see, both can be wrong, I guess. And the lwIP port can be bad as 
well. How could we know without even knowing what you are using, where 
it comes from, etc.
Share some more input and maybe someone here can help you.

Simon