무선 네트워크에 두 대의 노트북이 있습니다. 인터넷 접속은 둘 다 잘 작동합니다. 둘 다 'Ubuntu Desktop 20.04'를 실행하는 한 로컬 네트워크(ping 192.168...)에서도 서로 연결할 수 있습니다.
최근에 나는 그 중 하나에 'Ubuntu 데스크탑 22.04'를 설치했습니다(업그레이드하지 않고 새로 설치). 여전히 둘 다 무선 라우터를 통해 인터넷에 액세스할 수 있지만 ping(대상 호스트에 연결할 수 없음) 또는 ssh(ssh: 호스트에 연결 192.168.0.213 포트 22: 호스트에 대한 경로 없음)를 사용하여 더 이상 서로 연결할 수 없습니다.
이것을 다시 가능하게 하려면 어떻게 해야 합니까?
추가 정보 :
Ubuntu 20.04가 설치된 노트북:
$ 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
Ubuntu 22.04가 설치된 노트북:
$ 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 방화벽이 양쪽에서 비활성화되어 있습니다: $ sudo ufw status
상태: 비활성
답변1
나도 비슷한 문제를 겪었지만 내 경우에는 모든 우분투 버전이 문제를 겪고 있습니다. 내 네트워크의 우분투 시스템에 ping을 하거나 다른 방식으로 접근할 수 없습니다. 2wire DSL 모뎀에서 TP-Link 라우터로 전환했을 때 시작되었습니다. 내 해결 방법은 /etc/hosts에 로컬 IP 주소를 하드 코딩하는 것이었습니다. 내 우분투 시스템 중 하나는 22.04이고 다른 하나는 16.04입니다.