Please can you show output of ip a and ip r from the host and the container?
Also please show output of sudo bridge link on the host.
Host
# sudo bridge link
4: enp2s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master br0 state forwarding priority 32 cost 2
8: veth220a4b8@if7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master docker0 state forwarding priority 32 cost 2
11: veth5d6405c@if10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master br-f00f683a5cc0 state forwarding priority 32 cost 2
67: veth757b7a7@if66: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master br-1941fe87c583 state forwarding priority 32 cost 2
106: veth12357594@if105:
# 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: eno1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 6c:2b:59:c2:9b:69 brd ff:ff:ff:ff:ff:ff
3: eno2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 6c:2b:59:c2:9b:6a brd ff:ff:ff:ff:ff:ff
4: enp2s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br0 state UP group default qlen 1000
link/ether a0:36:9f:28:90:e4 brd ff:ff:ff:ff:ff:ff
inet6 fe80::a236:9fff:fe28:90e4/64 scope link
valid_lft forever preferred_lft forever
5: enp2s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether a0:36:9f:28:90:e6 brd ff:ff:ff:ff:ff:ff
6: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:04:bd:5c:d1 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::42:4ff:febd:5cd1/64 scope link
valid_lft forever preferred_lft forever
8: veth220a4b8@if7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP group default
link/ether e2:03:a6:e3:80:41 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet6 fe80::e003:a6ff:fee3:8041/64 scope link
valid_lft forever preferred_lft forever
9: br-f00f683a5cc0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:c7:4a:88:b7 brd ff:ff:ff:ff:ff:ff
inet 172.18.0.1/16 brd 172.18.255.255 scope global br-f00f683a5cc0
valid_lft forever preferred_lft forever
inet6 fe80::42:c7ff:fe4a:88b7/64 scope link
valid_lft forever preferred_lft forever
11: veth5d6405c@if10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-f00f683a5cc0 state UP group default
link/ether 22:27:07:5c:34:06 brd ff:ff:ff:ff:ff:ff link-netnsid 1
inet6 fe80::2027:7ff:fe5c:3406/64 scope link
valid_lft forever preferred_lft forever
15: br-6e3bfa69e4f9: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:cc:02:3e:cb brd ff:ff:ff:ff:ff:ff
inet 172.20.0.1/16 brd 172.20.255.255 scope global br-6e3bfa69e4f9
valid_lft forever preferred_lft forever
inet6 fe80::42:ccff:fe02:3ecb/64 scope link
valid_lft forever preferred_lft forever
18: br-mailcow: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:ee:c6:60:48 brd ff:ff:ff:ff:ff:ff
inet 172.22.1.1/24 brd 172.22.1.255 scope global br-mailcow
valid_lft forever preferred_lft forever
inet6 fd4d:6169:6c63:6f77::1/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::42:eeff:fec6:6048/64 scope link
valid_lft forever preferred_lft forever
inet6 fe80::1/64 scope link
valid_lft forever preferred_lft forever
65: br-1941fe87c583: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:ad:ef:14:36 brd ff:ff:ff:ff:ff:ff
inet 172.21.0.1/16 brd 172.21.255.255 scope global br-1941fe87c583
valid_lft forever preferred_lft forever
inet6 fe80::42:adff:feef:1436/64 scope link
valid_lft forever preferred_lft forever
67: veth757b7a7@if66: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-1941fe87c583 state UP group default
link/ether d6:43:4f:f8:fa:8e brd ff:ff:ff:ff:ff:ff link-netnsid 2
inet6 fe80::d443:4fff:fef8:fa8e/64 scope link
valid_lft forever preferred_lft forever
72: lxdbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 00:16:3e:25:3d:1e brd ff:ff:ff:ff:ff:ff
inet 10.74.168.1/24 scope global lxdbr0
valid_lft forever preferred_lft forever
inet6 fd42:4ce7:cc43:7ee::1/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::216:3eff:fe25:3d1e/64 scope link
valid_lft forever preferred_lft forever
96: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether a0:36:9f:28:90:e4 brd ff:ff:ff:ff:ff:ff
inet 212.7.201.38/26 brd 212.7.201.63 scope global br0
valid_lft forever preferred_lft forever
inet6 fe80::a236:9fff:fe28:90e4/64 scope link
valid_lft forever preferred_lft forever
106: veth12357594@if105: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UP group default qlen 1000
link/ether ea:d6:3f:d6:f3:cc brd ff:ff:ff:ff:ff:ff link-netnsid 3
# ip r
default via 212.7.201.62 dev br0 onlink
10.74.168.0/24 dev lxdbr0 proto kernel scope link src 10.74.168.1 linkdown
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1
172.18.0.0/16 dev br-f00f683a5cc0 proto kernel scope link src 172.18.0.1
172.20.0.0/16 dev br-6e3bfa69e4f9 proto kernel scope link src 172.20.0.1 linkdown
172.21.0.0/16 dev br-1941fe87c583 proto kernel scope link src 172.21.0.1
172.22.1.0/24 dev br-mailcow proto kernel scope link src 172.22.1.1 lin
Container
# 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
105: eth0@if106: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 00:16:3e:4b:7d:9b brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 212.7.201.17/26 brd 212.7.201.63 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::216:3eff:fe4b:7d9b/64 scope link
valid_lft forever preferred_lft forever
# ip r
default via 212.7.201.62 dev eth0
169.254.0.0/16 dev eth0 scope link metric 1105
212.7.201.0/26 dev eth0 proto kernel scope link src 212.7.201.17
Something strange going on in your network setup.
Have you considered using routed NIC type instead of bridged?