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Re: [lwip-users] lwip IPV6 PPP only get link local address and cannot co

From: Jiang Peng
Subject: Re: [lwip-users] lwip IPV6 PPP only get link local address and cannot connect to server
Date: Fri, 12 Nov 2021 16:39:09 +1100

Hi Sylvain,
thanks for the reply.
Today I tried the latest LwIP 2.1.3.  I enabled LWIP_IPV6_DHCP6, LWIP_IPV6 build option.
I see nd6_send_rs get called, but still cannot get the IPV6 unicast IP address from my ISP, only get LL address.
Any suggestions are really appreciated.

ppposif UTILS:   our6_ipaddr = FE80::30D4:A3ED:2943:32DC
local  LL address fe80::30d4:a3ed:2943:32dc
remote LL address fe80::b566:fac9:ff61:a117

On Fri, 12 Nov 2021 at 00:27, Sylvain Rochet <gradator@gradator.net> wrote:

On Thu, Nov 11, 2021 at 10:40:09AM +1100, Jiang Peng wrote:
> Hi everyone,
> I have a project that is running LwIP V2.1.2. The stack is LwIP on top of
> BG96 cellular modem.
> It works fine for IPV4, but when I enable IPV6, I only get IPV6 link local
> address, and cannot get real IPV6 address, therefore, I cannot connect to
> my server.
> The LwIP comes from ST cellular expansion package.
> I enable the log, and it got local and remote LL address, but after that
> never got any real address, and cannot connect to my server.
> thanks a lot for any hints or suggestions.

This is normal. You need to run IPv6 NDP, DHCPv6 or static
configuration, depending on what your peer is using, over the PPP link.

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