hello I have a proble with IPv6 root@technologie-passion:/etc/init.d# ping6 ipv6.google.com PING ipv6.google.com(par21s17-in-x0e.1e100.net (2a00:1450:4007:808::200e)) 56 data bytes From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=1 Destination unreachable: Address unreachable From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=2 Destination unreachable: Address unreachable From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=3 Destination unreachable: Address unreachable From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=4 Destination unreachable: Address unreachable From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=5 Destination unreachable: Address unreachable From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=6 Destination unreachable: Address unreachable From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=7 Destination unreachable: Address unreachable From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=8 Destination unreachable: Address unreachable From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=9 Destination unreachable: Address unreachable From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=10 Destination unreachable: Address unreachable From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=11 Destination unreachable: Address unreachable From 2001:41d0:303:4deb:: (2001:41d0:303:4deb: icmp_seq=12 Destination unreachable: Address unreachable ^C --- ipv6.google.com ping statistics --- 14 packets transmitted, 0 received, +12 errors, 100% packet loss, time 13312ms It is very strange. Help me Regards Sylvain,
ip6tables -S (ipv6) -P INPUT DROP -P FORWARD DROP -P OUTPUT DROP -A INPUT -i lo -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p ipv6-icmp -m icmp6 --icmpv6-type 135 -m hl --hl-eq 255 -j ACCEPT -A INPUT -p ipv6-icmp -m icmp6 --icmpv6-type 136 -m hl --hl-eq 255 -j ACCEPT -A INPUT -p ipv6-icmp -m icmp6 --icmpv6-type 134 -m hl --hl-eq 255 -j ACCEPT -A INPUT -p ipv6-icmp -m icmp6 --icmpv6-type 128 -m conntrack --ctstate NEW -m limit --limit 1/sec --limit-burst 1 -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT -A INPUT -p tcp -m tcp --dport 443 -j ACCEPT -A INPUT -p tcp -m tcp --dport 2222 -j ACCEPT -A INPUT -p tcp -m tcp --dport 21 -j ACCEPT -A INPUT -p tcp -m tcp --dport 990 -j ACCEPT -A INPUT -p tcp -m tcp --dport 989 -j ACCEPT -A OUTPUT -o lo -j ACCEPT -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A OUTPUT -p ipv6-icmp -m icmp6 --icmpv6-type 135 -j ACCEPT -A OUTPUT -p ipv6-icmp -m icmp6 --icmpv6-type 136 -j ACCEPT -A OUTPUT -p ipv6-icmp -m icmp6 --icmpv6-type 133 -j ACCEPT -A OUTPUT -p ipv6-icmp -m icmp6 --icmpv6-type 128 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 80 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 443 -j ACCEPT -A OUTPUT -p udp -m udp --dport 53 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 53 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 2222 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 21 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 990 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 989 -j ACCEPT
Did you ask your server provider, maybe they block ipv6 pings or there is another network config problem that affects IPv6 only?
Recently, I had the same issue after the latest Debian 9 kernel update. I fixed this problem as follows: Add at the very end of the file /etc/sysctl.d/ipv6.conf the following lines: net.ipv6.conf.default.accept_ra=0 net.ipv6.conf.all.accept_ra=0 net.ipv6.conf.ens3.accept_ra=0 Or within the file /etc/sysctl.d/ipv6.conf: net.ipv6.conf.default.accept_ra=0 net.ipv6.conf.all.accept_ra=0 net.ipv6.conf.ens3.accept_ra=0 After a VPS reboot you will have IPv6 connectivity again that stays. ens3 mentioned above is the name of my NIC. So if yours is eth0 for example, use that instead. Hopes this helps you too.
