[Bologna] Fwd: [lime-dev] Interface-dependent IPv6 prefix

[ThEgAmEr]

---------- Forwarded message ----------
From: Gui Iribarren <gui a altermundi.net>
Date: Fri, Dec 5, 2014 at 2:41 PM
Subject: Re: [lime-dev] Interface-dependent IPv6 prefix
To: libre-mesh developement <dev a lists.libre-mesh.org>


On 05/12/14 04:02, Marc Juul wrote:
> We're having the problem that bmx6 nodes sometime come up on different
> subnets.
>
> The interfaces are getting fd66:0066:0066:00XX::/64 IPs, where XX is the
> interface index. This means that some nodes are on different subnets,
> since they don't all have the same wifi interface index. Is this
> intentional, and if so, why? It means that just running "bmx6 dev=wlan0"
> on each node will not result in a working mesh where every node can
> reach every other node on their bmx6-assigned addresses.

it's intentional, and running "bmx6 dev=wlan0" should yield a working
mesh where every node can reach every other node on their fd66::...
address ("primaryIp")
check out
# ip -6 r show table 60

cheers!

>
> It seems that either the mask should be changed to /56 or the interface
> index should be used as the eigth or higher byte instead of the seventh?
> Perhaps it would be better to replace the ff:fe inserted into the middle
> of the MAC address with the interface index?
>
> Here's the responsible code from
> https://github.com/axn/bmx6/blob/master/ip.c:
>
> if (!global_prefix_cfg.mask && !dev->global_prefix_conf_.mask &&
> autoconf_prefix_cfg.mask) {
>     autoIP6 = bmx6AutoEUI64Ip6(dev->if_link->addr, &autoconf_prefix_cfg);
>     autoIP6.mask = DEF_AUTO_IP6_DEVMASK;
>     autoIP6.ip.s6_addr[6] = DEF_AUTO_IP6_BYTE6;
>     autoIP6.ip.s6_addr[7] = (uint8_t)dev->if_link->index; //different
> ULAs for equal MAC addresses!!
> }
>
> --
> marc/juul
>
>
>
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