Hi,
I'm having a network problem with my Fedora 24 Workstation. I cannot ping6 other hosts in the same LAN or on the Internet because it fails with Address unreachable. From other machine in the same LAN (F24 Server) it works fine. In the tcpdump I have the impression that the neighbor solicitations don't succeed. The IPv6 is otherwise working fine as I can do browsing, P2P and everything on it.
I'm going to show you my tests to see if anyone can give me any hint.
$ ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: enp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br-lan state UP group default qlen 1000 link/ether f4:6d:04:61:ab:b4 brd ff:ff:ff:ff:ff:ff 3: br-lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether f4:6d:04:61:ab:b4 brd ff:ff:ff:ff:ff:ff inet 192.168.10.100/24 brd 192.168.10.255 scope global br-lan valid_lft forever preferred_lft forever inet6 2001:470:7950:10::100/64 scope global valid_lft forever preferred_lft forever inet6 fe80::108f:1ae:a4ba:a348/64 scope link valid_lft forever preferred_lft forever 4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000 link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff inet 192.168.124.1/24 brd 192.168.124.255 scope global virbr0 valid_lft forever preferred_lft forever 5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000 link/ether 52:54:00:6e:af:89 brd ff:ff:ff:ff:ff:ff
$ ip -6 r 2001:470:7950:10::/64 dev br-lan proto kernel metric 256 pref medium fe80::/64 dev br-lan proto kernel metric 256 pref medium default via 2001:470:7950:10::1 dev br-lan proto static metric 425 pref medium
# brctl show bridge name bridge id STP enabled interfaces br-lan 8000.f46d0461abb4 yes enp5s0 virbr0 8000.000000000000 yes
# firewall-cmd --list-all FedoraWorkstation (default, active) interfaces: br-lan enp5s0 sources: services: dhcpv6-client mdns samba samba-client ssh ports: 5298/tcp 1900/udp 8333/tcp 8200/tcp protocols: masquerade: no forward-ports: icmp-blocks: rich rules:
$ ping6 -n www.google.com PING www.google.com(2a00:1450:4003:808::2004) 56 data bytes From 2001:470:7950:10::100 icmp_seq=1 Destination unreachable: Address unreachable From 2001:470:7950:10::100 icmp_seq=2 Destination unreachable: Address unreachable From 2001:470:7950:10::100 icmp_seq=3 Destination unreachable: Address unreachable From 2001:470:7950:10::100 icmp_seq=4 Destination unreachable: Address unreachable ^C --- www.google.com ping statistics --- 4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 2999ms
$ ping6 -n gateway PING gateway(2001:470:7950:10::1) 56 data bytes From 2001:470:7950:10::100 icmp_seq=1 Destination unreachable: Address unreachable From 2001:470:7950:10::100 icmp_seq=2 Destination unreachable: Address unreachable From 2001:470:7950:10::100 icmp_seq=3 Destination unreachable: Address unreachable From 2001:470:7950:10::100 icmp_seq=4 Destination unreachable: Address unreachable ^C --- gateway ping statistics --- 4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 2999ms
This is a tcpdump while the ping was running:
# tcpdump -n -i br-lan icmp6 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on br-lan, link-type EN10MB (Ethernet), capture size 262144 bytes 15:41:54.990240 IP6 2001:470:7950:10::100 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has 2001:470:7950:10::1, length 32 15:41:55.992056 IP6 2001:470:7950:10::100 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has 2001:470:7950:10::1, length 32 15:41:56.994060 IP6 2001:470:7950:10::100 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has 2001:470:7950:10::1, length 32 15:41:57.643074 IP6 fe80::5054:ff:fee1:2f75 > 2001:470:7950:10::100: ICMP6, neighbor solicitation, who has 2001:470:7950:10::100, length 32 15:41:57.643148 IP6 2001:470:7950:10::100 > fe80::5054:ff:fee1:2f75: ICMP6, neighbor advertisement, tgt is 2001:470:7950:10::100, length 24 15:41:58.991235 IP6 2001:470:7950:10::100 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has 2001:470:7950:10::1, length 32 15:41:59.992058 IP6 2001:470:7950:10::100 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has 2001:470:7950:10::1, length 32 15:42:00.994060 IP6 2001:470:7950:10::100 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has 2001:470:7950:10::1, length 32 15:42:02.660074 IP6 fe80::108f:1ae:a4ba:a348 > fe80::5054:ff:fee1:2f75: ICMP6, neighbor solicitation, who has fe80::5054:ff:fee1:2f75, length 32 15:42:02.660497 IP6 fe80::5054:ff:fee1:2f75 > fe80::108f:1ae:a4ba:a348: ICMP6, neighbor advertisement, tgt is fe80::5054:ff:fee1:2f75, length 24 15:42:02.992244 IP6 2001:470:7950:10::100 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has 2001:470:7950:10::1, length 32 15:42:03.994060 IP6 2001:470:7950:10::100 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has 2001:470:7950:10::1, length 32 ^C 12 packets captured 12 packets received by filter 0 packets dropped by kernel
Thank you.