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

From: Bandu
Subject: Re: [lwip-users] tcp_sndbuf(pcb) become zero with HUB
Date: Mon, 3 Nov 2008 21:03:18 +0000

thanks Jifl.

On Mon, Nov 3, 2008 at 8:57 PM, Jonathan Larmour <address@hidden> wrote:
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.

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