-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Content-ID: <alpine.LSU.2.20.1603192035250.14097@Grypbagne.inyvabe> Hi, I just told my router to send log entries to a computer on my lan, and it is talkative: <3.4> 2016-03-19T20:24:50+01:00 router radvd 675 - - our AdvOtherConfigFlag on br0 doesn't agree with fe80::8cae:84ff:fe43:27d4 <3.4> 2016-03-19T20:24:57+01:00 router radvd 675 - - our AdvOtherConfigFlag on br0 doesn't agree with fe80::8cae:84ff:fe43:27d4 <3.4> 2016-03-19T20:25:06+01:00 router radvd 675 - - our AdvOtherConfigFlag on br0 doesn't agree with fe80::8cae:84ff:fe43:27d4 <3.4> 2016-03-19T20:25:12+01:00 router radvd 675 - - our AdvOtherConfigFlag on br0 doesn't agree with fe80::8cae:84ff:fe43:27d4 <3.4> 2016-03-19T20:25:20+01:00 router radvd 675 - - our AdvOtherConfigFlag on br0 doesn't agree with fe80::8cae:84ff:fe43:27d4 <3.4> 2016-03-19T20:25:31+01:00 router radvd 675 - - message repeated 2 times: [ our AdvOtherConfigFlag on br0 doesn't agree with fe80::8cae:84ff:fe43:27d4] I only found a post in google with a similar message, and I don't see much in it: <http://w3foverflow.com/question/bridged-vm-guest-does-not-get-ipv6-ra-prefix-from-host/> As a first step, I try to find what machine is that in my LAN. I can ping it: Telcontar:~ # ping6 -I eth0 "fe80::8cae:84ff:fe43:27d4" PING fe80::8cae:84ff:fe43:27d4(fe80::8cae:84ff:fe43:27d4) from fe80::221:85ff:fe16:2d0b eth0: 56 data bytes 64 bytes from fe80::8cae:84ff:fe43:27d4: icmp_seq=1 ttl=64 time=1.79 ms 64 bytes from fe80::8cae:84ff:fe43:27d4: icmp_seq=2 ttl=64 time=0.501 ms 64 bytes from fe80::8cae:84ff:fe43:27d4: icmp_seq=3 ttl=64 time=0.471 ms 64 bytes from fe80::8cae:84ff:fe43:27d4: icmp_seq=4 ttl=64 time=0.489 ms ^C - --- fe80::8cae:84ff:fe43:27d4 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3003ms rtt min/avg/max/mdev = 0.471/0.812/1.790/0.565 ms Telcontar:~ # I think: maybe looking at its web page, if present or not, I could see what it is: printer, router, computer... Ok, so I try to browse to http://[fe80::8cae:84ff:fe43:27d4]/ in Firefox, following advice in Google. But Firefox says: +++..... The address isn't valid The URL is not valid and cannot be loaded. Web addresses are usually written like http://www.example.com/ Make sure that you're using forward slashes (i.e. /). ....++- Chrome, instead, says: +++..... This site can’t be reached The webpage at http://[fe80::8cae:84ff:fe43:27d4]/ might be temporarily down or it may have moved permanently to a new web address. ERR_INVALID_ARGUMENT ....++- I know we have talked about this previously, but I can't locate the posts. How then are IPv6 addresses entered into a browser, or is it not supported? More importantly, how do I locate that machine? I tried nmap, but no go: +++..... Telcontar:~ # nmap -A -T4 -6 "fe80::8cae:84ff:fe43:27d4" Starting Nmap 6.40 ( http://nmap.org ) at 2016-03-19 20:37 CET Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn Nmap done: 1 IP address (0 hosts up) scanned in 2.00 seconds Telcontar:~ # ....++- which is false, it responds to ping. I also tried ssh/telnet: Telcontar:~ # ssh [fe80::8cae:84ff:fe43:27d4] ssh: Could not resolve hostname [fe80::8cae:84ff:fe43:27d4]: Name or service not known Telcontar:~ # ssh "[fe80::8cae:84ff:fe43:27d4]" ssh: Could not resolve hostname [fe80::8cae:84ff:fe43:27d4]: Name or service not known Telcontar:~ # The man page says to use brackets. :-? - -- Cheers Carlos E. R. (from 13.1 x86_64 "Bottle" at Telcontar) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iEYEARECAAYFAlbtrmsACgkQtTMYHG2NR9WH5wCeJGVDEL0CqOq9pq/A05Yo6nOQ zg4AniIt3itBxYF+7RKO+tTgDBQ6arMB =2ZEB -----END PGP SIGNATURE-----