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Re: [lwip-users] IPv6 address auto-configuration with two different rout


From: yanhc519
Subject: Re: [lwip-users] IPv6 address auto-configuration with two different routers will fail
Date: Tue, 29 Jan 2019 21:13:58 +0800 (GMT+08:00)

OK, no problem.

On 01/29/2019 02:59, address@hidden wrote:
Am 27.01.2019 um 14:10 schrieb yanhc519:
> Hi, all.
>
> My experiment is to test lwip 2.1.2 IPv6 address auto-configuration with
> two different routers.
> And check whether IPv6 address auto-configuration is successful.
> Unfortunately, the test failed.
>
> My test board is running lwip2.1.2 and there are 3 IPv6 address for the
> Ethernet netif.
> Slot 0 is link local, slot 1 is for global address, slot 2 is for
> auto-configured address.
> My test board can setup auto-configuration IPv6 address with the Router
> 1 with valid time of 604800 seconds(7 days).
> The following address is the auto-configured address 1 with valid time
> of 604054.
> /FC00::D51:200:DFF:FE41:1, 604054/
> When I unplug the Ethernet cable, the auto-configured address 1 with
> prefix of Router 1 is still there and the valid time is counting down.
> /FC00::D51:200:DFF:FE41:1, 604038/
> When I plug the Ethernet cable to the Router 2, no new auto-configured
> IPv6 address will be generated for prefix of Router 2(FC00:0:0:5B1::/64).
> I think when the valid time of auto-configured address 1 is expired,
> another new address with prefix of Router 2 may generated.
> But, this is 7 days later which is not reasonable.
>
> I used the same procedure to test my laptop which is windows 10 with
> IPv6 auto-configuration enabled on Ethernet interface.
> I connected my laptop to the two Routers one by one, everything works fine.
> I notice that when I connect my laptop to *Router 2*, the valid time of
> the auto-configuration IPv6 address with prefix of *Router 1 *is reduced
> to 3 seconds from a 6 days.
> And after 3 seconds, the former auto-configured address is disappear and
> new auto-configured address is generated with prefix of Router 2.
> The procedure is as follows:
> /Interface 16: Ethernet 5/
> /Address type   DAD     Valid time   Preferred time   Address/
> /---------  ----------- ---------- ---------- ------------------------/
> /Public         No         6d23h59m50s  23h59m50s
> fc00::d51:8c79:e4f9:f5a3:e5eb/
> /Tentative         No         6d23h59m44s  23h57m15s
> fc00::d51:9146:165c:cb7f:f35a/
> /Other        No            infinite   infinite
> fe80::8c79:e4f9:f5a3:e5eb%16/
> /
> /
> /Interface 16: Ethernet  5/
> /Address type   DAD     Valid time   Preferred time   Address/
> /---------  ----------- ---------- ---------- ------------------------/
> /Public Preferred                 3s         3s
> fc00::d51:8c79:e4f9:f5a3:e5eb/
> /Tentative Preferred                 3s         3s
> fc00::d51:9146:165c:cb7f:f35a/
> /Other Preferred           infinite   infinite fe80::8c79:e4f9:f5a3:e5eb%16/
> /
> /
> /Interface16: Ethernet  5/
> /Address type   DAD     Valid time   Preferred time   Address/
> /---------  ----------- ---------- ---------- ------------------------/
> /Public Preferred        6d23h59m59s  23h59m59s
> fc00::5b1:8c79:e4f9:f5a3:e5eb/
> /Tentative Preferred        6d23h59m59s  23h57m30s
> fc00::5b1:b0de:2e31:256f:afcd/
> /Other Preferred           infinite   infinite fe80::8c79:e4f9:f5a3:e5eb%16/
>
>  From the test, we can see that when a new router is connected, windows
> 10 will set the valid time of the former prefix to 3 seconds to make it
> expired quickly,
> then new address will be generated.
>
> So, how to make lwip behave like windows 10 under such circumstances?

Probably by fixing it. Seems like a bug to me. Would you mind filing a
bug in our bug tracker to prevent this getting lost? Thanks.

Regards,
Simon

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