---------- Forwarded message ----------
From: Gui Iribarren <gui(a)altermundi.net>
Date: Fri, Dec 5, 2014 at 5:41 AM
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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