On 2015-11-10 12:02, Per Jessen wrote:
Freek de Kruijf wrote:
Op dinsdag 10 november 2015 09:06:01 schreef Per Jessen:
This would appear to show that your interface wlan0 is switching between two addresses, the fe80 and the fc00 prefix.
I thought so, but was unsure. I know very little about IPv6.
I would like to know where the fc00 address is coming from.
fe80 addresses are only usable in the broadcast domain of the network (link local address). fc00::/7 is a prefix used in a network of local importance, like a company network (for an international company this can be worldwide). It is a bit comparable with the 10 network for IPv4. Its purpose is to have simple filters on the edge of the network. Routers in the local network provide the prefix used for this type of address on the link. So apparently your system is connected to a router which is part of such a company network. In that case your system should have at least 3 IPv6 addresses, a fe80, a fc00 and a global address if your router is also connected to a world global IPv6 network. You may even have more than one world global network addresses, the last 64 bits derived from your MAC address, randomly generated and a fixed one received from a DHCP6 server or defined on your system.
Oh :-o
That makes two questions then -
a) why does Carlos have an FC00 address on his network? b) why does it change/toggle all the time?
Carlos, sounds like it might be coming from your router.
It is a home router provided by my ISP, with fibre entry. It also routes TV service, with some sort of invisible tunnel or whatever. I believe it also routes VoIp (SIP), which the entry gadget (prior to the router) converts to POTS. Stupid, they should provide real SIP, way much more powerful. But I have a suspicion... I have two routers in service. The ISP router gives lousy WiFi signal, so I disabled it and connected another router handling the WiFi part. It is possible that this other router tries to hand over IPv6 addresses, too. I will look now. The ISP router (Movistar-broadcom?) has a section in the config (untouched) named "IPv6 autoconfig". I don't know what addresses it hands out, if any. LAN IPv6 Link-Local Address Configuration EUI-64 The "secondary" router (TP-Link Model No. TD-W8970), used as WiFi AP only, has this config (I mark active options with «»): +++........................... The parameters of IPv6 LAN can be configured on this page. Note: Only default group supports IPv6 now. Group: Default Address Autoconfiguration Type: RADVD «DHCPv6 Server» Start IPv6 Address: fC00:0:0:0::«7FFF» (1~FFFE) End IPv6 Address: fC00:0:0:0::«FFFE» (1~FFFE) Leased Time: «86400» seconds (The default value is 86400) Site Prefix Configuration Type: Delegated «Static» Site Prefix: «fC00:0:0:0::» Site Prefix Length: «64» ...........................++- So the fc00 address is coming from the secondary router. I don't know how to disable this router trying to hand over IPv6 addresses. It should be done by the ISP router only. The DHCP (IPv4) is disabled, of course. I have just switched in the above shown config to «RADVD», and the avahi noise has stopped :-)) The noise about "org.freedesktop.nm_dispatcher" continues, though, but it is slower. -- Cheers / Saludos, Carlos E. R. (from 13.1 x86_64 "Bottle" at Telcontar)