Re: [lwip-users] tcp_sndbuf(pcb) become zero with HUB

[Jonathan Larmour]

Bandu wrote:
> Thank you very much, Jifl.
>  
> The links is reliable using network switch. I can transfer data the
> whole day without data loss.
> Ethernet driver is set to Multicast Reception mode.

Maybe your ethernet hardware isn't very intelligent and has to be set into
promiscuous mode to be able to do multicast. You'd have to look at the
driver (which isn't part of lwip, so people here are unlikely to be able to
help much as we won't know anything about the code).

> When tcp_sndbuf become lowering, the data are not going out anymore. It
> might be retries like you said.
> Is there any advise how would I debug those retries?

Using a packet sniffer like wireshark, ethereal, tcpdump.

Jifl
-- 
eCosCentric Limited      http://www.eCosCentric.com/     The eCos experts
Barnwell House, Barnwell Drive, Cambridge, UK.       Tel: +44 1223 245571
Registered in England and Wales: Reg No 4422071.
------["Si fractum non sit, noli id reficere"]------       Opinions==mine