CTs and VMs lost network connectivity

B

bradw

New Member
Aug 30, 2021
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I have a a Proxmox setup on my home network which was working fine up until yesterday when the network connections in all virtual machines and containers stopped working. I believe this was after updating the kernel but I can't be sure. Could also be due to installing docker on the host.

I've tried rebooting server + router, creating fresh containers and disabled firewall at all levels (DC, server, CT/VM) to no avail which leads me to believe it's an issue with the host.

I can't reach anything to/from the containers. Host networking seems fine - it can reach anything else on the local network and internet. Only access I have to the containers is via the Proxmox console.

ip route (host)
Code: 
default via 192.168.1.1 dev vmbr0 proto kernel onlink
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
192.168.1.0/24 dev vmbr0 proto kernel scope link src 192.168.1.2

ip addr (host)
Code: 
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: enp0s31f6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr0 state UP group default qlen 1000
    link/ether 50:9a:4c:49:ae:46 brd ff:ff:ff:ff:ff:ff
4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:a4:31:a1:24 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
9: veth103i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr103i0 state UP group default qlen 1000
    link/ether fe:d7:20:b8:93:2e brd ff:ff:ff:ff:ff:ff link-netnsid 1
10: fwbr103i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether ea:91:c0:40:e5:2c brd ff:ff:ff:ff:ff:ff
11: fwpr103p0@fwln103i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 86:ea:60:8c:ff:fc brd ff:ff:ff:ff:ff:ff
    inet6 fe80::84ea:60ff:fe8c:fffc/64 scope link 
       valid_lft forever preferred_lft forever
12: fwln103i0@fwpr103p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr103i0 state UP group default qlen 1000
    link/ether 36:ff:2f:9d:e6:20 brd ff:ff:ff:ff:ff:ff
13: veth104i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr104i0 state UP group default qlen 1000
    link/ether fe:bb:8b:95:bc:b8 brd ff:ff:ff:ff:ff:ff link-netnsid 2
14: fwbr104i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 22:fc:b1:e5:65:bd brd ff:ff:ff:ff:ff:ff
15: fwpr104p0@fwln104i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 96:6f:52:c6:a2:e2 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::946f:52ff:fec6:a2e2/64 scope link 
       valid_lft forever preferred_lft forever
16: fwln104i0@fwpr104p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr104i0 state UP group default qlen 1000
    link/ether be:2e:b3:9c:0b:50 brd ff:ff:ff:ff:ff:ff
17: veth102i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr102i0 state UP group default qlen 1000
    link/ether fe:25:c4:0f:a3:9c brd ff:ff:ff:ff:ff:ff link-netnsid 3
18: fwbr102i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 2e:54:86:75:38:a8 brd ff:ff:ff:ff:ff:ff
19: fwpr102p0@fwln102i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 3a:bb:9a:f0:1b:87 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::38bb:9aff:fef0:1b87/64 scope link 
       valid_lft forever preferred_lft forever
20: fwln102i0@fwpr102p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr102i0 state UP group default qlen 1000
    link/ether 96:67:05:27:22:a4 brd ff:ff:ff:ff:ff:ff
21: veth107i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr107i0 state UP group default qlen 1000
    link/ether fe:ba:f0:9d:2a:48 brd ff:ff:ff:ff:ff:ff link-netnsid 4
22: fwbr107i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 92:71:8a:33:7a:de brd ff:ff:ff:ff:ff:ff
23: fwpr107p0@fwln107i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 22:3a:6d:f9:8b:1a brd ff:ff:ff:ff:ff:ff
    inet6 fe80::203a:6dff:fef9:8b1a/64 scope link 
       valid_lft forever preferred_lft forever
24: fwln107i0@fwpr107p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr107i0 state UP group default qlen 1000
    link/ether be:3a:aa:6d:40:76 brd ff:ff:ff:ff:ff:ff
25: veth108i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr108i0 state UP group default qlen 1000
    link/ether fe:da:39:d3:a7:ee brd ff:ff:ff:ff:ff:ff link-netnsid 5
26: fwbr108i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 96:d9:09:48:9d:5a brd ff:ff:ff:ff:ff:ff
27: fwpr108p0@fwln108i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 5e:12:db:f3:d4:87 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::5c12:dbff:fef3:d487/64 scope link 
       valid_lft forever preferred_lft forever
28: fwln108i0@fwpr108p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr108i0 state UP group default qlen 1000
    link/ether ca:1b:66:00:69:35 brd ff:ff:ff:ff:ff:ff
29: veth109i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr109i0 state UP group default qlen 1000
    link/ether fe:c5:0b:85:dc:c2 brd ff:ff:ff:ff:ff:ff link-netnsid 6
30: fwbr109i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 4a:06:af:91:27:c0 brd ff:ff:ff:ff:ff:ff
31: fwpr109p0@fwln109i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether ee:1b:4c:cb:06:0d brd ff:ff:ff:ff:ff:ff
    inet6 fe80::ec1b:4cff:fecb:60d/64 scope link 
       valid_lft forever preferred_lft forever
32: fwln109i0@fwpr109p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr109i0 state UP group default qlen 1000
    link/ether 52:9f:93:75:e9:68 brd ff:ff:ff:ff:ff:ff
33: veth112i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr112i0 state UP group default qlen 1000
    link/ether fe:cc:75:a7:88:ab brd ff:ff:ff:ff:ff:ff link-netnsid 7
34: fwbr112i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 3a:ac:9e:c6:7b:b5 brd ff:ff:ff:ff:ff:ff
35: fwpr112p0@fwln112i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 32:ea:17:62:92:d3 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::30ea:17ff:fe62:92d3/64 scope link 
       valid_lft forever preferred_lft forever
36: fwln112i0@fwpr112p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr112i0 state UP group default qlen 1000
    link/ether 3e:00:c3:d8:ba:6f brd ff:ff:ff:ff:ff:ff
37: veth110i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr110i0 state UP group default qlen 1000
    link/ether fe:ca:30:a4:4d:fd brd ff:ff:ff:ff:ff:ff link-netnsid 8
38: fwbr110i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 36:91:bd:67:f3:ea brd ff:ff:ff:ff:ff:ff
39: fwpr110p0@fwln110i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether fe:72:90:65:63:44 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc72:90ff:fe65:6344/64 scope link 
       valid_lft forever preferred_lft forever
40: fwln110i0@fwpr110p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr110i0 state UP group default qlen 1000
    link/ether 06:77:1d:19:0e:26 brd ff:ff:ff:ff:ff:ff
45: veth101i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr101i0 state UP group default qlen 1000
    link/ether fe:22:5f:eb:00:bf brd ff:ff:ff:ff:ff:ff link-netnsid 0
46: fwbr101i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 02:9b:e7:47:be:d8 brd ff:ff:ff:ff:ff:ff
47: fwpr101p0@fwln101i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 2e:6d:54:8f:3d:3f brd ff:ff:ff:ff:ff:ff
    inet6 fe80::2c6d:54ff:fe8f:3d3f/64 scope link 
       valid_lft forever preferred_lft forever
48: fwln101i0@fwpr101p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr101i0 state UP group default qlen 1000
    link/ether be:d6:87:f8:a5:00 brd ff:ff:ff:ff:ff:ff
49: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 50:9a:4c:49:ae:46 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.2/24 scope global vmbr0
       valid_lft forever preferred_lft forever
    inet6 fe80::529a:4cff:fe49:ae46/64 scope link 
       valid_lft forever preferred_lft forever
50: veth113i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr113i0 state UP group default qlen 1000
    link/ether fe:8b:dc:92:20:f5 brd ff:ff:ff:ff:ff:ff link-netnsid 9
51: fwbr113i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 6a:9a:24:34:fd:74 brd ff:ff:ff:ff:ff:ff
52: fwpr113p0@fwln113i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
    link/ether 02:0c:85:41:ef:84 brd ff:ff:ff:ff:ff:ff
53: fwln113i0@fwpr113p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr113i0 state UP group default qlen 1000
    link/ether 0a:5f:ef:0e:e0:06 brd ff:ff:ff:ff:ff:ff

pct config 113 (host)
Code: 
arch: amd64
cores: 8
features: nesting=1
hostname: test
memory: 5120
net0: name=eth0,bridge=vmbr0,firewall=1,gw=192.168.1.1,hwaddr=D6:78:ED:73:E2:68,ip=192.168.1.23/32,type=veth
ostype: ubuntu
rootfs: local-lvm:vm-113-disk-0,size=8G
swap: 512
unprivileged: 1

ip route (container)
Code: 
default via 192.168.1.1 dev eth0 proto static 
192.168.1.1 dev eth0 proto static scope link

ip addr (container)
Code: 
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: eth0@if50: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether d6:78:ed:73:e2:68 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 192.168.1.23/32 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::d478:edff:fe73:e268/64 scope link 
       valid_lft forever preferred_lft forever
 
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