Cannot ping router from Ubuntu 20.04, can access internet.

[kalpana]

route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.254 0.0.0.0 UG 100 0 0 enp7s0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 virbr0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 lxcbr0
192.168.1.0 0.0.0.0 255.255.255.0 U 100 0 0 enp7s0
192.168.100.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0


ip r
default via 192.168.1.254 dev enp7s0 proto dhcp metric 100
169.254.0.0/16 dev virbr0 scope link metric 1000 linkdown
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1
192.168.1.0/24 dev lxcbr0 proto kernel scope link src 192.168.1.64 linkdown
192.168.1.0/24 dev enp7s0 proto kernel scope link src 192.168.1.90 metric 100
192.168.100.0/24 dev virbr0 proto kernel scope link src 192.168.100.1 linkdown


ip a
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: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether d0:50:99:d0:1d:4b brd ff:ff:ff:ff:ff:ff
inet 192.168.1.90/24 brd 192.168.1.255 scope global dynamic noprefixroute enp7s0
valid_lft 85693sec preferred_lft 85693sec
inet6 2600:1700:5ac1:4d90::49/128 scope global dynamic noprefixroute
valid_lft 2897sec preferred_lft 2897sec
inet6 2600:1700:5ac1:4d90:2c69:c0b4:6494:ffe1/64 scope global temporary dynamic
valid_lft 3171sec preferred_lft 3171sec
inet6 2600:1700:5ac1:4d90:6c2b:da86:1f80:4688/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 3171sec preferred_lft 3171sec
inet6 fe80::4ee3:45c8:948:8ffe/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:b7:01:dc brd ff:ff:ff:ff:ff:ff
inet 192.168.100.1/24 brd 192.168.100.255 scope global virbr0
valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 1000
link/ether 52:54:00:b7:01:dc brd ff:ff:ff:ff:ff:ff
5: lxcbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 00:16:3e:00:00:00 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.64/24 brd 192.168.1.255 scope global lxcbr0
valid_lft forever preferred_lft forever
6: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:1b:42:8c:67 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
inet6 fe80::42:1bff:fe42:8c67/64 scope link
valid_lft forever preferred_lft forever
10: veth862d46f@if9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP group default
link/ether 7a:dd:74:31:26:0e brd ff:ff:ff:ff:ff:ff link-netnsid 1
inet6 fe80::78dd:74ff:fe31:260e/64 scope link
valid_lft forever preferred_lft forever
16: vethfd3cf83@if15: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP group default
link/ether ea:a8:7a:8a:db:cb brd ff:ff:ff:ff:ff:ff link-netnsid 2
inet6 fe80::e8a8:7aff:fe8a:dbcb/64 scope link
valid_lft forever preferred_lft forever


ifconfig
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
inet6 fe80::42:1bff:fe42:8c67 prefixlen 64 scopeid 0x20<link>
ether 02:42:1b:42:8c:67 txqueuelen 0 (Ethernet)
RX packets 280147341 bytes 382351977660 (382.3 GB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 128313437 bytes 30336506233 (30.3 GB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

enp7s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.90 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::4ee3:45c8:948:8ffe prefixlen 64 scopeid 0x20<link>
inet6 2600:1700:5ac1:4d90:6c2b:da86:1f80:4688 prefixlen 64 scopeid 0x0<global>
inet6 2600:1700:5ac1:4d90:2c69:c0b4:6494:ffe1 prefixlen 64 scopeid 0x0<global>
inet6 2600:1700:5ac1:4d90::49 prefixlen 128 scopeid 0x0<global>
ether d0:50:99:d0:1d:4b txqueuelen 1000 (Ethernet)
RX packets 131044511 bytes 30751638500 (30.7 GB)
RX errors 0 dropped 147907 overruns 0 frame 0
TX packets 292466602 bytes 404479703137 (404.4 GB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device memory 0xdf200000-df27ffff

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 13007 bytes 1344535 (1.3 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 13007 bytes 1344535 (1.3 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lxcbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.1.64 netmask 255.255.255.0 broadcast 192.168.1.255
ether 00:16:3e:00:00:00 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

veth862d46f: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::78dd:74ff:fe31:260e prefixlen 64 scopeid 0x20<link>
ether 7a:dd:74:31:26:0e txqueuelen 0 (Ethernet)
RX packets 106 bytes 6852 (6.8 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 6743 bytes 1332033 (1.3 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

vethfd3cf83: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::e8a8:7aff:fe8a:dbcb prefixlen 64 scopeid 0x20<link>
ether ea:a8:7a:8a:db:cb txqueuelen 0 (Ethernet)
RX packets 246301107 bytes 341269771154 (341.2 GB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 119991124 bytes 29171299948 (29.1 GB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.100.1 netmask 255.255.255.0 broadcast 192.168.100.255
ether 52:54:00:b7:01:dc txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0


sudo nano /etc/netplan/01-network-manager-all.yaml
Let NetworkManager manage all devices on this system
network:
version: 2
renderer: NetworkManager


sudo nano /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false

[device]
wifi.scan-rand-mac-address=no


ip neighbor show
192.168.1.100 dev enp7s0 lladdr 04:42:1a:f1:33:6a STALE
192.168.1.100 dev lxcbr0 FAILED
192.168.1.66 dev lxcbr0 FAILED
192.168.1.72 dev lxcbr0 FAILED
172.17.0.2 dev docker0 lladdr 02:42:ac:11:00:02 REACHABLE
192.168.1.176 dev lxcbr0 FAILED
192.168.1.1 dev lxcbr0 FAILED
192.168.1.66 dev enp7s0 lladdr ac:12:03:71:52:73 STALE
192.168.1.68 dev lxcbr0 FAILED
192.168.1.108 dev lxcbr0 FAILED
192.168.1.254 dev lxcbr0 FAILED
172.17.0.3 dev docker0 lladdr 02:42:ac:11:00:03 STALE
192.168.1.123 dev lxcbr0 FAILED
192.168.1.90 dev lxcbr0 FAILED
192.168.1.183 dev lxcbr0 FAILED
192.168.1.103 dev lxcbr0 FAILED
192.168.1.254 dev enp7s0 lladdr 38:a0:67:cf:21:52 REACHABLE
192.168.1.70 dev lxcbr0 FAILED
2600:1700:5ac1:4d90::1 dev enp7s0 lladdr 38:a0:67:cf:21:52 router STALE
fe80::3aa0:67ff:fecf:2152 dev enp7s0 lladdr 38:a0:67:cf:21:52 router REACHABLE


sudo iptables -L -v -n
Chain INPUT (policy ACCEPT 4709 packets, 2757K bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT tcp -- lxcbr0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:53
0 0 ACCEPT udp -- lxcbr0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:53
0 0 ACCEPT tcp -- lxcbr0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:67
0 0 ACCEPT udp -- lxcbr0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:67
326K 128M LIBVIRT_INP all -- * * 0.0.0.0/0 0.0.0.0/0

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
409M 411G DOCKER-USER all -- * * 0.0.0.0/0 0.0.0.0/0
409M 411G DOCKER-ISOLATION-STAGE-1 all -- * * 0.0.0.0/0 0.0.0.0/0
129M 29G ACCEPT all -- * docker0 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
241 13164 DOCKER all -- * docker0 0.0.0.0/0 0.0.0.0/0
281M 383G ACCEPT all -- docker0 !docker0 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- docker0 docker0 0.0.0.0/0 0.0.0.0/0
8 408 ACCEPT all -- * lxcbr0 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lxcbr0 * 0.0.0.0/0 0.0.0.0/0
0 0 LIBVIRT_FWX all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 LIBVIRT_FWI all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 LIBVIRT_FWO all -- * * 0.0.0.0/0 0.0.0.0/0

Chain OUTPUT (policy ACCEPT 3227 packets, 921K bytes)
pkts bytes target prot opt in out source destination
174K 53M LIBVIRT_OUT all -- * * 0.0.0.0/0 0.0.0.0/0

Chain DOCKER (1 references)
pkts bytes target prot opt in out source destination
12 624 ACCEPT tcp -- !docker0 docker0 0.0.0.0/0 172.17.0.3 tcp dpt:9443
0 0 ACCEPT tcp -- !docker0 docker0 0.0.0.0/0 172.17.0.3 tcp dpt:9000
0 0 ACCEPT tcp -- !docker0 docker0 0.0.0.0/0 172.17.0.3 tcp dpt:8000
90 4776 ACCEPT tcp -- !docker0 docker0 0.0.0.0/0 172.17.0.2 tcp dpt:9091

Chain DOCKER-ISOLATION-STAGE-1 (1 references)
pkts bytes target prot opt in out source destination
281M 383G DOCKER-ISOLATION-STAGE-2 all -- docker0 !docker0 0.0.0.0/0 0.0.0.0/0
409M 411G RETURN all -- * * 0.0.0.0/0 0.0.0.0/0

Chain DOCKER-ISOLATION-STAGE-2 (1 references)
pkts bytes target prot opt in out source destination
0 0 DROP all -- * docker0 0.0.0.0/0 0.0.0.0/0
281M 383G RETURN all -- * * 0.0.0.0/0 0.0.0.0/0

Chain DOCKER-USER (1 references)
pkts bytes target prot opt in out source destination
409M 411G RETURN all -- * * 0.0.0.0/0 0.0.0.0/0

Chain LIBVIRT_FWI (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT all -- * virbr0 0.0.0.0/0 192.168.100.0/24 ctstate RELATED,ESTABLISHED
0 0 REJECT all -- * virbr0 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable

Chain LIBVIRT_FWO (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT all -- virbr0 * 192.168.100.0/24 0.0.0.0/0
0 0 REJECT all -- virbr0 * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable

Chain LIBVIRT_FWX (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT all -- virbr0 virbr0 0.0.0.0/0 0.0.0.0/0

Chain LIBVIRT_INP (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT udp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:53
0 0 ACCEPT tcp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:53
0 0 ACCEPT udp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:67
0 0 ACCEPT tcp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:67

Chain LIBVIRT_OUT (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT udp -- * virbr0 0.0.0.0/0 0.0.0.0/0 udp dpt:53
0 0 ACCEPT tcp -- * virbr0 0.0.0.0/0 0.0.0.0/0 tcp dpt:53
0 0 ACCEPT udp -- * virbr0 0.0.0.0/0 0.0.0.0/0 udp dpt:68
0 0 ACCEPT tcp -- * virbr0 0.0.0.0/0 0.0.0.0/0 tcp dpt:68


sudo nano /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 1.1.1.1
nameserver 8.8.8.8
nameserver 127.0.0.53
search attlocal.net


lspci -k
07:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
Subsystem: ASRock Incorporation I210 Gigabit Network Connection
Kernel driver in use: igb
Kernel modules: igb


ping 8.8.8.8
PING 8.8.8.8 (8.8.8. 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=57 time=16.8 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=57 time=15.2 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=57 time=17.5 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=57 time=16.0 ms
64 bytes from 8.8.8.8: icmp_seq=5 ttl=57 time=18.1 ms


ping 192.168.1.254
PING 192.168.1.254 (192.168.1.254) 56(84) bytes of data.
From 192.168.1.64 icmp_seq=1 Destination Host Unreachable
From 192.168.1.64 icmp_seq=2 Destination Host Unreachable
From 192.168.1.64 icmp_seq=5 Destination Host Unreachable
From 192.168.1.64 icmp_seq=6 Destination Host Unreachable
From 192.168.1.64 icmp_seq=7 Destination Host Unreachable


*****RESOLVED******

Deleted lxcbr0 and now everything works as expected.

• brctl show
• ip link set lxcbr0 down
• brctl delbr lxcbr0