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| Failure to ping IPv6 address in Gentoo https://forum.linode.com/viewtopic.php?f=19&t=11552 |
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| Author: | tinyau [ Wed Jan 28, 2015 3:29 am ] |
| Post subject: | Failure to ping IPv6 address in Gentoo |
I'm using Gentoo and failed to ping IPv6 address by the following command ping6 ipv6.google.com -c 3 The result is 100% packet loss. I have contacted Linode support and checked several areas. Linode support said it's quite tough to diagnose the problem and suggested me to seek support in the forum. I have checked IPv6 privacy extension is disabled. - content of /proc/sys/net/ipv6/conf/eth0/use_tempaddr is '0'. Please refer to the output of the several related commands for reference. Thanks a lot. ifconfig -------- eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 106.187.97.149 netmask 255.255.255.0 broadcast 106.187.97.255 inet6 2400:8900::2858:6484:e8ea:e61 prefixlen 64 scopeid 0x0<global> inet6 fe80::f03c:91ff:fe96:2d21 prefixlen 64 scopeid 0x20<link> ether f2:3c:91:96:2d:21 txqueuelen 1000 (Ethernet) RX packets 275726 bytes 46460135 (44.3 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 317620 bytes 101092501 (96.4 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 ip -6 route ------------ 2400:8900::/64 dev eth0 proto kernel metric 3 mtu 1500 fe80::/64 dev eth0 proto kernel metric 256 default via fe80::1 dev eth0 metric 3 mtu 1500 ip -6 addr ----------- 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2400:8900::2858:6484:e8ea:e61/64 scope global dynamic valid_lft 2591985sec preferred_lft 604785sec inet6 fe80::f03c:91ff:fe96:2d21/64 scope link valid_lft forever preferred_lft forever ip -6 neigh ------------ fe80::8678:acff:fe5a:15c1 dev eth0 lladdr 84:78:ac:5a:15:c1 router STALE fe80::1 dev eth0 lladdr 00:05:73:a0:0f:ff router STALE fe80::8678:acff:fe0d:95c1 dev eth0 lladdr 84:78:ac:0d:95:c1 router STALE sysctl -a | egrep 6.*eth0.*forwarding ----------------------------------------- net.ipv6.conf.eth0.forwarding = 1 sysctl -a | grep conf.eth0.accept_ra --------------------------------------- net.ipv6.conf.eth0.accept_ra = 1 net.ipv6.conf.eth0.accept_ra_defrtr = 1 net.ipv6.conf.eth0.accept_ra_from_local = 0 net.ipv6.conf.eth0.accept_ra_pinfo = 1 net.ipv6.conf.eth0.accept_ra_rtr_pref = 1 |
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| Author: | retrograde inversion [ Wed Jan 28, 2015 3:47 am ] |
| Post subject: | Re: Failure to ping IPv6 address in Gentoo |
Can you show the output of "ip6tables-save"? |
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| Author: | XReaper [ Wed Jan 28, 2015 3:55 am ] |
| Post subject: | Re: Failure to ping IPv6 address in Gentoo |
I wonder if `ping6 fe80::1 -I 2400:8900::2858:6484:e8ea:e61` would work. |
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| Author: | tinyau [ Wed Jan 28, 2015 3:57 am ] |
| Post subject: | Re: Failure to ping IPv6 address in Gentoo |
retrograde inversion wrote: Can you show the output of "ip6tables-save"? Code: # Generated by ip6tables-save v1.4.21 on Wed Jan 28 15:56:40 2015 |
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| Author: | dwfreed [ Wed Jan 28, 2015 4:30 am ] |
| Post subject: | Re: Failure to ping IPv6 address in Gentoo |
Are you using dhcpcd? |
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| Author: | tinyau [ Wed Jan 28, 2015 5:18 am ] |
| Post subject: | Re: Failure to ping IPv6 address in Gentoo |
XReaper wrote: I wonder if `ping6 fe80::1 -I 2400:8900::2858:6484:e8ea:e61` would work. Same result - 100% packet loss. |
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| Author: | tinyau [ Wed Jan 28, 2015 5:19 am ] |
| Post subject: | Re: Failure to ping IPv6 address in Gentoo |
dwfreed wrote: Are you using dhcpcd? Yes, and already used 'ipv6' USE flag in make.conf to make all software IPv6 compatible. |
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| Author: | tinyau [ Wed Jan 28, 2015 5:25 am ] |
| Post subject: | Re: Failure to ping IPv6 address in Gentoo |
Linode support has mentioned that it my Linode has the following IPv6 addresses set: 2400:8900::2858:6484:e8ea:e61/64 (Global) fe80::f03c:91ff:fe96:2d21/64 (Link Local) But it should be the followings for IPv6 privacy extensions is disabled. 2400:8900::f03c:91ff:fe96:2d21/128 (Global) fe80::f03c:91ff:fe96:2d21/128 (Link Local) He suspected IPv6 privacy extensions is enabled that caused SLAAC to have issues and give you Linode the wrong IPv6 address. However, IPv6 privacy extensions is actually DISABLED in my Gentoo Linode. |
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| Author: | dwfreed [ Wed Jan 28, 2015 12:41 pm ] |
| Post subject: | Re: Failure to ping IPv6 address in Gentoo |
dhcpcd defaults to doing a new method for privacy extensions, which generates stable addresses based on a secret key stored on the machine combined with the prefix from the router advertisement. However, this still doesn't work on Linode, because you must use the EUI-64-based SLAAC address. To disable this behavior in dhcpcd, remove 'slaac private' from your /etc/dhcpcd.conf. |
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| Author: | tinyau [ Thu Jan 29, 2015 3:06 am ] |
| Post subject: | Re: Failure to ping IPv6 address in Gentoo |
dwfreed wrote: dhcpcd defaults to doing a new method for privacy extensions, which generates stable addresses based on a secret key stored on the machine combined with the prefix from the router advertisement. However, this still doesn't work on Linode, because you must use the EUI-64-based SLAAC address. To disable this behavior in dhcpcd, remove 'slaac private' from your /etc/dhcpcd.conf. The problem is solved, thank you so much. 
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