Eu tenho dois laptops em uma rede sem fio. O acesso à Internet funciona bem para ambos. Contanto que ambos estivessem executando o 'Ubuntu desktop 20.04', eles também poderiam se comunicar na rede local (ping 192.168...).
Recentemente instalei o 'Ubuntu desktop 22.04' em um deles (nova instalação, não atualização). Ainda assim, ambos têm acesso à Internet através do roteador sem fio, mas não podem mais se comunicar usando ping (Destination Host Unreachable) ou ssh (ssh: conecte-se ao host 192.168.0.213 porta 22: Sem rota para o host).
O que posso fazer para tornar isso possível novamente?
Informação adicional :
Laptop com Ubuntu 20.04:
$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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: enp0s25: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
link/ether f0:de:f1:3d:4a:7e brd ff:ff:ff:ff:ff:ff
3: wlp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:24:d7:86:0e:c0 brd ff:ff:ff:ff:ff:ff
inet 192.168.0.213/24 brd 192.168.0.255 scope global dynamic noprefixroute wlp3s0
valid_lft 3189sec preferred_lft 3189sec
inet6 2a02:908:671:ae80:bcc5:1967:7578:d90f/64 scope global temporary dynamic
valid_lft 74660sec preferred_lft 31460sec
inet6 2a02:908:671:ae80:1221:e3ff:b1c1:ec8c/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 74660sec preferred_lft 31460sec
inet6 fe80::66c9:eda5:134f:7837/64 scope link noprefixroute
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 52:54:00:41:7d:1a brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 1000
link/ether 52:54:00:41:7d:1a brd ff:ff:ff:ff:ff:ff
6: mpqemubr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:a2:48:4b brd ff:ff:ff:ff:ff:ff
inet 10.10.141.1/24 brd 10.10.141.255 scope global mpqemubr0
valid_lft forever preferred_lft forever
7: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:9b:c6:47:bd brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
valid_lft forever preferred_lft forever
$ ip route
default via 192.168.0.1 dev wlp3s0 proto dhcp metric 600
10.10.141.0/24 dev mpqemubr0 proto kernel scope link src 10.10.141.1 linkdown
169.254.0.0/16 dev wlp3s0 scope link metric 1000
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
192.168.0.0/24 dev wlp3s0 proto kernel scope link src 192.168.0.213 metric 600
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
$ ip neigh
192.168.0.1 dev wlp3s0 lladdr 34:2c:c4:31:64:d1 DELAY
fe80::362c:c4ff:fe31:64d1 dev wlp3s0 lladdr 34:2c:c4:31:64:d1 router REACHABLE
Laptop com Ubuntu 22.04:
$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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: enp0s25: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
link/ether f0:de:f1:78:4e:5a brd ff:ff:ff:ff:ff:ff
4: wlp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether a0:88:b4:d2:f7:3c brd ff:ff:ff:ff:ff:ff
inet 192.168.0.24/24 brd 192.168.0.255 scope global dynamic noprefixroute wlp3s0
valid_lft 2601sec preferred_lft 2601sec
inet6 2a02:908:671:ae80:861f:42bf:a369:89fe/64 scope global temporary dynamic
valid_lft 74080sec preferred_lft 30880sec
inet6 2a02:908:671:ae80:aaa3:6bfa:1117:d7a1/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 74080sec preferred_lft 30880sec
inet6 fe80::ca1:8cc6:59db:6bf6/64 scope link noprefixroute
valid_lft forever preferred_lft forever
5: wwx028037ec0200: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 02:80:37:ec:02:00 brd ff:ff:ff:ff:ff:ff
$ ip route
default via 192.168.0.1 dev wlp3s0 proto dhcp metric 600
169.254.0.0/16 dev wlp3s0 scope link metric 1000
192.168.0.0/24 dev wlp3s0 proto kernel scope link src 192.168.0.24 metric 600
$ ip neigh
192.168.0.213 dev wlp3s0 FAILED
192.168.0.1 dev wlp3s0 lladdr 34:2c:c4:31:64:d1 REACHABLE
fe80::362c:c4ff:fe31:64d1 dev wlp3s0 lladdr 34:2c:c4:31:64:d1 router REACHABLE
ps Firewall está inativo em ambos os lados: $ sudo ufw status
Status: inativo
Responder1
Eu também tive um problema semelhante, porém, no meu caso, todas as versões do Ubuntu sofrem, ou seja. não consigo executar ping ou acessar sistemas Ubuntu na minha rede. Tudo começou quando mudei de um modem DSL 2wire para um roteador TP-Link. Minha solução foi codificar os endereços IP locais em/etc/hosts. Um dos meus sistemas Ubuntu é 22.04, o outro é 16.04.