Re: [lwip-users] LWIP Dual Stack - IPv4 and IPv6

[Sylvain Rochet]

Hi Edman,

On Thu, Jul 15, 2021 at 04:24:29PM +0000, Zayzay, Edman G wrote:
> Hi,
> 
> I am running LwiP 2.1.2 and have been able to successfully run IPv4 
> and IPv6 individually with PPPoS. However, whenever I enable both IPv4 
> and IPv6 on PPPoS, I am seeing only the IPV6CP ConfigReq is being 
> responded to. I do not see one IPCP ConfigReq goes out and nothing is 
> sent. I tested on the Linux and saw the Linux is sending multiple IPCP 
> ConfigReq during negotiation until the modem respond to both IPCP and 
> IPv6CP ConfigReq. My FSM_TIMEOUT is set to the default 6 seconds. When 
> the PPPoS negotiation completes, I see the IPv6 address assigned but 
> nothing is assigned for IPv4. I view of the above, Is there a way I 
> can ensure that LWip continues to send the IPCP ConfigReq until the 
> modem respond so that both IPv4 and IPv6 address are assigned?
> 
> Please see below a snippet of the debug output

That is strange, you should see IPCP retries at least, could you try 
adding more timers by setting a large value to MEMP_NUM_SYS_TIMEOUT ?

Sylvain

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