I have a raspberry pi 4, which I set up as accesspoint (bridge).
I performed an apt update and apt upgrade. That process did not indicate any problem. I'm now on raspbian buster.
After a reboot, I'm no longer able to access the internet from the raspberry, though the bridging itself is working (I can connect with my phone to the raspberry to go on the internet)
When trying to use the browser on the raspberry, I get the error: err_name_resolution_failed
When doing ping www.google.be or ping www.google.be -I br0, I get "Temporary failure in name resolution"
Edit:
Ping 172.217.12.142 results in network unreachable.
Ping 172.217.12.142 -I br0 in all packets lost
Some more details:
$ ifconfig
inet6 fe80::dea6:32ff:fe53:46ef prefixlen 64 scopeid 0x20<link>
ether dc:a6:32:53:46:ef txqueuelen 1000 (Ethernet)
RX packets 268 bytes 69413 (67.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 15 bytes 2052 (2.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether dc:a6:32:53:46:ef txqueuelen 1000 (Ethernet)
RX packets 634 bytes 353998 (345.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 388 bytes 49293 (48.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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 9 bytes 524 (524.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 9 bytes 524 (524.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether dc:a6:32:53:46:f0 txqueuelen 1000 (Ethernet)
RX packets 387 bytes 43643 (42.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 651 bytes 371960 (363.2 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
$ ip addr
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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br0 state UP group default qlen 1000
link/ether dc:a6:32:53:46:ef brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP group default qlen 1000
link/ether dc:a6:32:53:46:f0 brd ff:ff:ff:ff:ff:ff
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether dc:a6:32:53:46:ef brd ff:ff:ff:ff:ff:ff
inet6 fe80::dea6:32ff:fe53:46ef/64 scope link
valid_lft forever preferred_lft forever
$ brctl show
br0 8000.dca6325346ef no eth0
wlan0
$ brctl showstp br0
bridge id 8000.dca6325346ef
designated root 8000.dca6325346ef
root port 0 path cost 0
max age 20.00 bridge max age 20.00
hello time 2.00 bridge hello time 2.00
forward delay 15.00 bridge forward delay 15.00
ageing time 300.00
hello timer 0.00 tcn timer 0.00
topology change timer 0.00 gc timer 269.82
flags
eth0 (1)
port id 8001 state forwarding
designated root 8000.dca6325346ef path cost 4
designated bridge 8000.dca6325346ef message age timer 0.00
designated port 8001 forward delay timer 0.00
designated cost 0 hold timer 0.00
flags
wlan0 (2)
port id 8002 state forwarding
designated root 8000.dca6325346ef path cost 100
designated bridge 8000.dca6325346ef message age timer 0.00
designated port 8002 forward delay timer 0.00
designated cost 0 hold timer 0.00
flags
$ cat /etc/network/interfaces
# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d
# Bridge setup
auto br0
iface br0 inet manual
bridge_ports eth0 wlan0
wireless-power off
/etc/sysctl.conf
all is commented
$ sudo nano /etc/dhcpcd.conf (I took some snippets)
# Inform the DHCP server of our hostname for DDNS.
hostname
# Use the hardware address of the interface for the Client ID.
clientid
# Persist interface configuration when dhcpcd exits.
persistent
# Rapid commit support.
# Safe to enable by default because it requires the equivalent option set
# on the server to actually work.
option rapid_commit
# Safe to enable by default because it requires the equivalent option set
# on the server to actually work.
option rapid_commit
# A list of options to request from the DHCP server.
option domain_name_servers, domain_name, domain_search, host_name
option classless_static_routes
# Respect the network MTU. This is applied to DHCP routes.
option interface_mtu
# A ServerID is required by RFC2131.
require dhcp_server_identifier
#list of options to request from the DHCP server.
option domain_name_servers, domain_name, domain_search, host_name
option classless_static_routes
# Respect the network MTU. This is applied to DHCP routes.
option interface_mtu
# A ServerID is required by RFC2131.
require dhcp_server_identifier
# Generate SLAAC address using the Hardware Address of the interface
#slaac hwaddr OR generate Stable Private IPv6 Addresses based from the DUID
slaac private
# For wireless Access point
denyinterfaces wlan0 eth0
