On 04/10/17 06:39, Ed Greshko wrote: > On 04/10/17 05:33, Stephen Morris wrote: >> Thanks Rick, am I correct in understanding that you are saying that >> even though I have IPv6 set to link-local, that IPv6 is still being >> attempted across the internet gateway, and in my case because my ISP >> doesn't support IPv6, I am assuming those packets would be rejected >> and hence the system would fall back to IPv4, or is it the case that >> IPv6 is tried for every transmission, which would then make internet >> access horribly inefficient? > > No. The link-local addresses are not route-able. They cannot traverse > routers. Any DNS response with a IPv6 address will not be utilized. > So, you wouldn't get any IPv6 traffic attempting to go out the WAN path. >
To further illustrate.... With full IPv6 available this is the routing table. Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If 2001:470:d:6bd::/64 :: U 100 0 0 enp0s3 fe80::ae22:bff:fed1:5d70/128 :: U 100 0 0 enp0s3 fe80::/64 :: U 256 0 1 enp0s3 ::/0 fe80::ae22:bff:fed1:5d70 UG 100 0 0 enp0s3 ::/0 :: !n -1 1 14269 lo ::1/128 :: Un 0 2 17 lo 2001:470:d:6bd:8800:f914:12ee:a343/128 :: Un 0 1 9 lo fe80::5a1c:5ee4:bc16:2b7d/128 :: Un 0 2 10 lo ff00::/8 :: U 256 1 22 enp0s3 ::/0 :: !n -1 1 14269 lo Notice the ::/0 with a nexthop address? That is the default route for IPv6 traffic. With link-local... Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If fe80::/64 :: U 256 0 4 enp0s3 ::/0 :: !n -1 1 14226 lo ::1/128 :: Un 0 2 17 lo fe80::5a1c:5ee4:bc16:2b7d/128 :: Un 0 1 12 lo ff00::/8 :: U 256 1 22 enp0s3 ::/0 :: !n -1 1 14226 lo No default route.... -- Fedora Users List - The place to go to get others to do the work for you _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org
