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[lwip-devel] [bug #58085] Openwrt Router discovery Device failed

From: Lucas
Subject: [lwip-devel] [bug #58085] Openwrt Router discovery Device failed
Date: Tue, 31 Mar 2020 00:34:12 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36


                 Summary: Openwrt Router discovery Device failed
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: lucaslwip1699
            Submitted on: Tue 31 Mar 2020 04:34:10 AM UTC
                Category: IPv6
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: Other



I try to debug ipv6 feature in lwip 2.1.2 release version
the environment I use was Win10PC <-> Openwrt Router <-> Board with lwip

  fistly I config my router with IPv6 related configuration and then connect
PC to LAN port ,Win10 PC get the right ipv6 address and its prefix was rule by
router (ULA). and I find the IPv6 address was exist in the neighbor table in
the Openwrt router.then I ping the PC in the router command line interface
with the IPv6 address assign to the PC. everythine works fine.
  secondly I connnect my device to the Openwrt router,and then ping command
seems no work from router to device. then I catch some data with tcpdump
package and analysis it with wareshark. i find some different between PC and
my dvice communicate with router , the PC will use ULA address which prefix
was get from RA msg to communicate with router , but my device with lwip stack
get ULA succ but it do not use it to communicate with rouer ,but only use
link-local address instead .SO I was confuseed why lwip do not use autoconfig
address to instead link-local address ? 
   In my opnion in local network ULA shouled be preferred than link-local
address ,and maybe it is my fault of lwip ipv6 feature use, SO sincerely to
get some answer or advice of it .


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