Um nó na minha rede de repente se tornou inacessível do meu laptop e telefone, mas é acessível de outros nós. Ele também não consegue alcançar meu laptop ou telefone, mas consegue alcançar outros nós e alcançar a internet.
Isso aconteceu do nada. É um sistema relativamente novo e não me lembro de ter alterado nada. No entanto, pode ter coincidido com a instalação do Docker no computador em questão.
Uma visão geral da rede:
192.168.1.1- Roteador192.168.1.10- Repetidor sem fio192.168.1.20- HTPC.192.168.1.90- Computador portátil.
Tanto o HTPC quanto o laptop estão conectados ao Wi-Fi principal.
O HTPC pode fazer ping em outros nós:
root@htpc:~# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=59 time=13.9 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=59 time=8.35 ms
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 8.351/11.147/13.943/2.796 ms
root@htpc:~# ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=3.05 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=3.87 ms
^C
--- 192.168.1.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 3.045/3.456/3.868/0.411 ms
root@htpc:~# ping 192.168.1.10
PING 192.168.1.10 (192.168.1.10) 56(84) bytes of data.
64 bytes from 192.168.1.10: icmp_seq=1 ttl=63 time=4.74 ms
64 bytes from 192.168.1.10: icmp_seq=2 ttl=63 time=5.26 ms
^C
--- 192.168.1.10 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 4.738/5.001/5.264/0.263 ms
Entretanto, ele não consegue fazer ping no laptop:
root@htpc:~# ping 192.168.1.90
PING 192.168.1.90 (192.168.1.90) 56(84) bytes of data.
From 192.168.1.20 icmp_seq=1 Destination Host Unreachable
From 192.168.1.20 icmp_seq=2 Destination Host Unreachable
From 192.168.1.20 icmp_seq=3 Destination Host Unreachable
From 192.168.1.20 icmp_seq=4 Destination Host Unreachable
From 192.168.1.20 icmp_seq=5 Destination Host Unreachable
From 192.168.1.20 icmp_seq=6 Destination Host Unreachable
^C
--- 192.168.1.90 ping statistics ---
7 packets transmitted, 0 received, +6 errors, 100% packet loss, time 6145ms
pipe 4
root@htpc:~#
Sua tabela de roteamento se parece com isso, e o firewall ufw está desabilitado:
root@htpc:~# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default _gateway 0.0.0.0 UG 600 0 0 wlo1
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
172.18.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-a221f258ed7f
192.168.1.0 0.0.0.0 255.255.255.0 U 600 0 0 wlo1
root@htpc:~# ufw status
Status: inactive
Suas regras de tabelas de IP:
root@htpc:~# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy DROP)
target prot opt source destination
DOCKER-USER all -- anywhere anywhere
DOCKER-ISOLATION-STAGE-1 all -- anywhere anywhere
ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED
DOCKER all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED
DOCKER all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Chain DOCKER (2 references)
target prot opt source destination
Chain DOCKER-ISOLATION-STAGE-1 (1 references)
target prot opt source destination
DOCKER-ISOLATION-STAGE-2 all -- anywhere anywhere
DOCKER-ISOLATION-STAGE-2 all -- anywhere anywhere
RETURN all -- anywhere anywhere
Chain DOCKER-ISOLATION-STAGE-2 (2 references)
target prot opt source destination
DROP all -- anywhere anywhere
DROP all -- anywhere anywhere
RETURN all -- anywhere anywhere
Chain DOCKER-USER (1 references)
target prot opt source destination
RETURN all -- anywhere anywhere
Sua tabela ARO:
_gateway (192.168.1.1) at d4:24:dd:5d:22:9d [ether] on wlo1
? (192.168.1.10) at 30:23:03:dc:1c:19 [ether] on wlo1
Fazer ping no htpc do laptop não funciona, mas é claro que o laptop pode se comunicar com todos os outros nós:
kopf@prkbook ~ ping 192.168.1.20
PING 192.168.1.20 (192.168.1.20): 56 data bytes
ping: sendto: Host is down
ping: sendto: Host is down
Request timeout for icmp_seq 0
ping: sendto: Host is down
Request timeout for icmp_seq 1
ping: sendto: Host is down
Request timeout for icmp_seq 2
ping: sendto: Host is down
Request timeout for icmp_seq 3
ping: sendto: Host is down
Request timeout for icmp_seq 4
ping: sendto: Host is down
Request timeout for icmp_seq 5
ping: sendto: Host is down
Request timeout for icmp_seq 6
^C
--- 192.168.1.20 ping statistics ---
8 packets transmitted, 0 packets received, 100.0% packet loss
kopf@prkbook ~ ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1): 56 data bytes
64 bytes from 192.168.1.1: icmp_seq=0 ttl=64 time=5.044 ms
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=10.624 ms
^C
--- 192.168.1.1 ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 5.044/7.834/10.624/2.790 ms
Tabela ARP do laptop:
? (192.168.1.1) at d4:24:dd:5d:22:9d on en0 ifscope [ethernet]
? (192.168.1.10) at 30:23:3:dc:1c:19 on en0 ifscope [ethernet]
? (192.168.1.20) at (incomplete) on en0 ifscope [ethernet]
? (192.168.1.255) at ff:ff:ff:ff:ff:ff on en0 ifscope [ethernet]
mdns.mcast.net (224.0.0.251) at 1:0:5e:0:0:fb on en0 ifscope permanent [ethernet]
Alguém tem alguma ideia de qual outro problema pode estar aqui?
Graças ao comentário de @spiff sobre as tabelas ARP, entrei no caminho certo. Parece ter sido um problema como o que eles descreveram.
Depois de redefinir o endereço MAC do meu wifi no nó problemático, consegui restaurar a conectividade entre os nós na rede.