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.
--
Juan Orti
https://apuntesderootblog.wordpress.com/
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