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Re: [lwip-devel] IPV6 udp_send() fails when enabling Dual Stack(IPV4 and

From: address@hidden
Subject: Re: [lwip-devel] IPV6 udp_send() fails when enabling Dual Stack(IPV4 and IPv6) configuration and with multiple interface
Date: Thu, 2 Apr 2020 20:39:05 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0

Am 02.03.2020 um 07:08 schrieb cy-arsm:
> Hi,
> In my current project i have enabled Dual Stack (IPv4 and IPv6) with
> multiple interfaces.
> My query : How to send IPV6 udp packet from the second interface when source
> address is 0?
> I'm binding the socket with port only.
> Trying the below sequence:
>       - Add interface-1 to the netif list, bring up interface-1.
>       - send and receive the IPv4 and IPv6 packets with interface-1.
>       - Bring down interface-1.
>       - Add interface-2 to netif list, bring up interface-2.
>       - send and receive the IPv4 packets with interface-2.
>       - send multicast link-local IPv6 packets with interface-2. udp_send() 
> since ip6_route() returns interface as NULL.
> Please give some solution.
> Thank you,

Sorry, I haven't found the time to dig into this, yet. To prevent it
getting forgotten, I've filed a bug report for this:



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