How to get IPv6 running properly?
Solution 1
inet6 addr: fe80::16da:e9ff:feb6:357e/64 Scope:Link
fe80::/10 as the "Scope" behind it states is a Link-Local address.
To connect to the rest of the internet you need a Global address (thus out of 2000::/3 at least for the next several years) and of course you need at least a default (::/0) or defaultish (2000::/3) route to a router that will actually forward your packets.
As such you have two options: 1) ask your ISP to provide you with native IPv6 2) get a tunnel (google for 'wikipedia ipv6 tunnel broker' to get a good list).
Solution 2
You don't have a public IPv6 address set up on your host (public addresses start with 2xxx or 3xxx). You only have a link-local (fe80::) address set up, so you can only ping other hosts in your lan.
You have to set "-I eth0" when pinging, because you're pinging a link-local address (fe80::/64), which is set up on all your interfaces, and ping doesn't know which interface to use.
You need to contact your network admin about the network settings (IP address,, gateway, dns), and set it up. Since router advertisment is enabled by default on most machines, there is probably no router sending them out, or you would have had an autoconfigured and IPv6 address.
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Cobra_Fast
Updated on September 18, 2022Comments
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Cobra_Fast over 1 year
So, my problem is that I just can't get IPv6 to work. Ping6 just tells me
connect: Network is unreachable
when I try to pingipv6.google.com
for example.ifconfig
looks like (a tad censored):eth0 Link encap:Ethernet HWaddr **:**:e9:b6:35:7e inet addr:***.*.65.177 Bcast:***.*.65.191 Mask:255.255.255.224 inet6 addr: fe80::16da:e9ff:feb6:357e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:* errors:0 dropped:0 overruns:0 frame:0 TX packets:* errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:* TX bytes:* Interrupt:28 Base address:0xc000 lo ...
route -6
returns:Destination Next Hop Flag Met Ref Use If fe80::/64 :: U 256 0 0 eth0 fe80::/64 :: U 256 0 0 tap0 ::/0 :: !n -1 1 5400 lo ::1/128 :: Un 0 4269387 lo fe80::16da:e9ff:feb6:357e/128 :: Un 0 1 391 lo fe80::4c7b:2bff:fef4:9db/128 :: Un 0 1 0 lo ff00::/8 :: U 256 0 0 eth0 ff00::/8 :: U 256 0 0 tap0 ::/0 :: !n -1 1 5400 lo
Another strange thing is, pinging my own IPv6 address only works if I tell
ping6
to specifically use theeth0
interface with-I eth0
otherwise that'll returnunknown host
.One thing I've read is that I need to specify my router in the routing table somehow, but I don't even know the router's address and I have no idea about how to find it out either (because I'm nothing like a networking expert and IPv6 seems even more confusing than IPv4 to me).
Any ideas or solutions?
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Admin over 11 yearsI feel bad for asking this, but does your ISP definitely support IPv6? Your router will then need to be set up for IPv6, too. Also, is this a home question, because those are off-topic here? Check out our FAQ
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Admin over 11 years@Chloe Yes definitely. The machine is a server in a proper datacenter. No home stuff going on here...
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Admin over 11 yearsFair enough, in that case you need to have a chat with whoever is in charge with the router / networking before you can proceed much further.
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Admin over 11 yearsAnd what specifically would I ask and look for?
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Admin about 7 yearsYou need a public ipv6 address, you can get form you isp provider. But some isp providers not have ipv6 service. For configuration ipv6 refer my post here. askubuntu.com/a/894840/582516
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Peter Krauss almost 6 years+1 for clue about set option, now ping is working... But only works as "self ping", when I in the ssh, eg.
ping6 -I eth0 2604:a880:2:d0::20c7:c001
is public (!) but not ping in other machines.