[OpenWrt-Devel] IPv6-question / fe80 / linklocal / uniq?
when reading http://en.wikipedia.org/wiki/IPv6#Link_local_address it seems to me, that the linklocal-address should be uniq, but here: root@box:~ ip neigh | grep ^'fe80::' | grep lladdr $mac fe80::1cfc:fe65:769:3784 dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE fe80::cea:3b47:5812:96be dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE why this? bye, bastian ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
Re: [OpenWrt-Devel] IPv6-question / fe80 / linklocal / uniq?
On Tue, Jul 22, 2014 at 11:50:55AM +0200, Bastian Bittorf wrote: when reading http://en.wikipedia.org/wiki/IPv6#Link_local_address it seems to me, that the linklocal-address should be uniq, unique is ambiguous: do you mean that the same LL address can't be present on different interfaces? on different hosts? That a host can only have one link-local address per interface? but here: root@box:~ ip neigh | grep ^'fe80::' | grep lladdr $mac fe80::1cfc:fe65:769:3784 dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE fe80::cea:3b47:5812:96be dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE # ip -6 addr add fe80::1cfc:fe65:769:3784/64 dev eth0 # ip -6 addr add fe80::cea:3b47:5812:96be/64 dev eth0 I don't see any problem with that. In your case, fe80::1cfc:fe65:769:3784 is an EUI64 address, while the other one is not (so, probably added manually). why this? bye, bastian ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel pgpXK1tDgw62q.pgp Description: PGP signature ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
Re: [OpenWrt-Devel] IPv6-question / fe80 / linklocal / uniq?
On 22/07/14 06:50, Bastian Bittorf wrote: when reading http://en.wikipedia.org/wiki/IPv6#Link_local_address it seems to me, that the linklocal-address should be uniq, but here: root@box:~ ip neigh | grep ^'fe80::' | grep lladdr $mac fe80::1cfc:fe65:769:3784 dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE fe80::cea:3b47:5812:96be dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE different link-local addresses, same MAC address. nothing wrong about that try doing ip a add fe80::1234/64 dev eth0 in your laptop or wherever; voila! you have an extra, manually-set link-local address, that resolves to the same MAC address (when asked by icmpv6) the uniqueness of the link-local address you mention, means there should not be two different computers/devices with the same ipv6 address on the same collision domain. It does not mean that a host must have only 1 link-local address. why this? bye, bastian ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
Re: [OpenWrt-Devel] IPv6-question / fe80 / linklocal / uniq?
* Baptiste Jonglez bjong...@illyse.org [22.07.2014 13:21]: On Tue, Jul 22, 2014 at 11:50:55AM +0200, Bastian Bittorf wrote: when reading http://en.wikipedia.org/wiki/IPv6#Link_local_address it seems to me, that the linklocal-address should be uniq, unique is ambiguous: do you mean that the same LL address can't be present on different interfaces? on different hosts? That a host can only have one link-local address per interface? I wondered, that the same host/mac has 2 different link-local addresses. root@box:~ ip neigh | grep ^'fe80::' | grep lladdr $mac fe80::1cfc:fe65:769:3784 dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE fe80::cea:3b47:5812:96be dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE # ip -6 addr add fe80::1cfc:fe65:769:3784/64 dev eth0 # ip -6 addr add fe80::cea:3b47:5812:96be/64 dev eth0 I don't see any problem with that. In your case, fe80::1cfc:fe65:769:3784 is an EUI64 address, while the other one is not (so, probably added manually). ok, thanks for this explanation - now i'am unsure which process give out fe80:: adresses which are not EUI64 - but thats another story 8-) bye, bastian ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
Re: [OpenWrt-Devel] IPv6-question / fe80 / linklocal / uniq?
* Gui Iribarren g...@altermundi.net [22.07.2014 13:21]: fe80::1cfc:fe65:769:3784 dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE fe80::cea:3b47:5812:96be dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE different link-local addresses, same MAC address. nothing wrong about that any idea which part of OpenWrt is responsible for adding these addresses? It's r41037 here - maybe odhcpd? bye, bastian ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
Re: [OpenWrt-Devel] IPv6-question / fe80 / linklocal / uniq?
* Baptiste Jonglez bjong...@illyse.org [22.07.2014 13:21]: root@box:~ ip neigh | grep ^'fe80::' | grep lladdr $mac fe80::1cfc:fe65:769:3784 dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE fe80::cea:3b47:5812:96be dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE # ip -6 addr add fe80::1cfc:fe65:769:3784/64 dev eth0 # ip -6 addr add fe80::cea:3b47:5812:96be/64 dev eth0 I don't see any problem with that. In your case, fe80::1cfc:fe65:769:3784 is an EUI64 address, while the other one is not (so, probably added manually). but should'nt be tge EUI64 of 84:b1:53:b2:b8:b3 the fe80::86b1:53ff:feb2:b8b3? (or is this only the subset 'modified EUI64'?) bye, bastian ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
Re: [OpenWrt-Devel] IPv6-question / fe80 / linklocal / uniq?
On Tue, Jul 22, 2014 at 02:08:16PM +0200, Bastian Bittorf wrote: * Baptiste Jonglez bjong...@illyse.org [22.07.2014 13:21]: root@box:~ ip neigh | grep ^'fe80::' | grep lladdr $mac fe80::1cfc:fe65:769:3784 dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE fe80::cea:3b47:5812:96be dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE # ip -6 addr add fe80::1cfc:fe65:769:3784/64 dev eth0 # ip -6 addr add fe80::cea:3b47:5812:96be/64 dev eth0 I don't see any problem with that. In your case, fe80::1cfc:fe65:769:3784 is an EUI64 address, while the other one is not (so, probably added manually). but should'nt be tge EUI64 of 84:b1:53:b2:b8:b3 the fe80::86b1:53ff:feb2:b8b3? (or is this only the subset 'modified EUI64'?) Maybe this machine is running a ND proxy or something similar? Without describing your setup, it's hard to tell. Btw, you could check on this other machine (the one with the 84:b1:53:b2:b8:b3 MAC address, I assume you have access to it) whether it really has multiple link-local addresses. pgpndorxt2y1U.pgp Description: PGP signature ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
