lwIP - A Lightweight TCP/IP stack - Bugs: bug #58103, IPV6 udp_send() fails when...
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bug #58103: IPV6 udp_send() fails when enabling Dual Stack(IPV4 and IPv6) configuration and with multiple interface
Submitter: | Simon Goldschmidt <goldsimon> | ||
Submitted: | Thu 02 Apr 2020 06:38:24 PM UTC | ||
Category: | UDP | Severity: | 3 - Normal |
Item Group: | Faulty Behaviour | Status: | None |
Privacy: | Public | Assigned to: | None |
Open/Closed: | Open | Planned Release: | None |
lwIP version: | Other |
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This is from lwip-users (https://lists.nongnu.org/archive/html/lwip-devel/2020-03/msg00000.html):
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() FAIL,
since ip6_route() returns interface as NULL.
Please give some solution.
Thank you,