Proxmox generate 2 mac address visibile on the switch not allowed by the data center

openaspace · Sep 9, 2021

Hello.
After server reboot I received a MAC abuse notification from Hetzner.
Looking the networks device, now I have found this 2 mac in 2fwbr.
I have on vmbr0 opnesense with vmbr1 and vmbr2 as private LAN.
Others vps and xlc are directly connected on the vmbr0 with separate public ip's and dedicated MAC address relased from hetzner and someone at the same time on the vmbr2 private LAN

Why this happen?!?

> Unallowed MACs:
> 3a:3e:f1:e2:5f:2b - (code line 8 and 10)
> ea:9b:09:ea:b3:4f - (code line 12 and 14)


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: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr0 state UP group default qlen 1000
    link/ether d4:3d:7e:d8:bd:c5 brd ff:ff:ff:ff:ff:ff
3: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether d4:3d:7e:d8:bd:c5 brd ff:ff:ff:ff:ff:ff
    inet xxxx.xx.xx.35 peer xxx.xx.xx.33/32 brd xxx.xx.xxx.63 scope global vmbr0
       valid_lft forever preferred_lft forever
    inet6 fe80::d63d:7eff:fed8:bdc5/64 scope link
       valid_lft forever preferred_lft forever
4: vmbr1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether aa:20:df:e2:84:9c brd ff:ff:ff:ff:ff:ff
    inet 192.168.30.0/24 brd 192.168.30.255 scope global vmbr1
       valid_lft forever preferred_lft forever
    inet6 fe80::78e5:9eff:fee4:5fa2/64 scope link
       valid_lft forever preferred_lft forever
5: vmbr2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
    link/ether b2:00:40:0b:c1:b6 brd ff:ff:ff:ff:ff:ff
    inet 192.168.40.0/24 brd 192.168.40.255 scope global vmbr2
       valid_lft forever preferred_lft forever
    inet6 fe80::b000:40ff:fe0b:c1b6/64 scope link
       valid_lft forever preferred_lft forever
6: tailscale0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1280 qdisc pfifo_fast state UNKNOWN group default qlen 500
    link/none
    inet xxx.xx.xx.74/32 scope global tailscale0
       valid_lft forever preferred_lft forever
    inet6 fd7a:115c:a1e0:ab12:4843:cd96:624c:194a/128 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::32c0:fb93:8c30:7cf9/64 scope link stable-privacy
       valid_lft forever preferred_lft forever
7: veth114i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr114i0 state UP group default qlen 1000
    link/ether fe:cd:09:f0:2b:e2 brd ff:ff:ff:ff:ff:ff link-netnsid 0
8: fwbr114i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether [B]3a:3e:f1:e2:5f:2b[/B] brd ff:ff:ff:ff:ff:ff
9: fwpr114p0@fwln114i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
    link/ether b6:8c:4d:12:53:8c brd ff:ff:ff:ff:ff:ff
10: fwln114i0@fwpr114p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr114i0 state UP group default qlen 1000
    link/ether [B]3a:3e:f1:e2:5f:2b[/B] brd ff:ff:ff:ff:ff:ff
11: tap200i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq master fwbr200i0 state UNKNOWN group default qlen 1000
    link/ether c2:e8:08:25:fb:d1 brd ff:ff:ff:ff:ff:ff
12: fwbr200i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether [B]ea:9b:09:ea:b3:4f[/B] brd ff:ff:ff:ff:ff:ff
13: fwpr200p0@fwln200i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
    link/ether ea:68:35:62:f1:5f brd ff:ff:ff:ff:ff:ff
14: fwln200i0@fwpr200p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr200i0 state UP group default qlen 1000
    link/ether [B]ea:9b:09:ea:b3:4f [/B]brd ff:ff:ff:ff:ff:ff
20: tap100i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq master fwbr100i0 state UNKNOWN group default qlen 1000
    link/ether aa:b0:74:ab:f4:e4 brd ff:ff:ff:ff:ff:ff
21: fwbr100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether c2:e1:f1:3f:b4:ce brd ff:ff:ff:ff:ff:ff
22: fwpr100p0@fwln100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
    link/ether 76:38:69:53:7f:51 brd ff:ff:ff:ff:ff:ff
23: fwln100i0@fwpr100p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr100i0 state UP group default qlen 1000
    link/ether c2:e1:f1:3f:b4:ce brd ff:ff:ff:ff:ff:ff
24: tap100i1: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr1 state UNKNOWN group default qlen 1000
    link/ether aa:20:df:e2:84:9c brd ff:ff:ff:ff:ff:ff

spirit · Sep 10, 2021

Hi, see : https://forum.proxmox.com/threads/proxmox-claiming-mac-address.52601/

TLDR :

hertzner send crap to your box, with wrong destination mac/ip.
if you use proxmox firewall with "reject" rules, a RST packet is send with iptables with this wrong mac/ip as src.

The previous thread have some workaround with ebtables rules to block outgoing mac.

fast fix : use drop rules

if you use reject rules, I would like to test:

"sysctl -w net.netfilter.nf_conntrack_tcp_loose = 0"

another way, allow manually only all yours mac address with:

ebtables -I FORWARD -o enp2s0 -p IPv4 --among-src ! 00:50:56:15:14:e5,d4:3d:7e:da:f0:03 -j DROP

(where enp2s0 is your physical interface)

openaspace · Sep 12, 2021

spirit said:
ebtables -I FORWARD -o enp2s0 -p IPv4 --among-src ! 00:50:56:15:14:e5,d4:3d:7e:da:f0:03 -j

Hi really thank you. I will try now.
Are this rules permanent among proxmox upgrade?
Could be nice to manage from the browser control panel like iptables

spirit · Sep 12, 2021

openaspace said:
Hi really thank you. I will try now.
Are this rules permanent among proxmox upgrade?
Could be nice to manage from the browser control panel like iptables

I'm currently looking to add an option in pve-firewall to do it automaticaly.
but you can edit /etc/network/interfaces,

with something like

Code:

auto enp2s0
iface enp2s0 ...
     ....
     post-up ebtables -I FORWARD -o enp2s0 -p IPv4 --among-src ! 00:50:56:15:14:e5,d4:3d:7e:da:f0:03 -j

openaspace · Sep 12, 2021

spirit said:
I'm currently looking to add an option in pve-firewall to do it automaticaly.

You are big!!!

add it also for proxmox 6.x version!

Undergrid · Sep 12, 2021

spirit said:
I'm currently looking to add an option in pve-firewall to do it automaticaly.
but you can edit /etc/network/interfaces,

with something like

Code:

auto enp2s0 iface enp2s0 ... .... post-up ebtables -I FORWARD -o enp2s0 -p IPv4 --among-src ! 00:50:56:15:14:e5,d4:3d:7e:da:f0:03 -j

If I was bridging enp2s0 (or in my case enp0s31f6) with vmbr0, would the post-up rule need be done on the interface, bridge or for the host and each VM? And would just ommiting the "-p IPv4" make this work for dual IPv4/IPv6 network stacks too?

For reference, my network config is:

Code:

auto lo
iface lo inet loopback

iface enp0s31f6 inet manual

auto vmbr0
iface vmbr0 inet static
        address  95.216.xx.yy
        netmask  255.255.255.192
        gateway  95.216.xx.zz
        bridge-ports enp0s31f6
        bridge-stp off
        bridge-fd 0

iface vmbr0 inet6 static
        address  2a01:4f9:xx:yyy::2
        netmask  64
        gateway  fe80::1

auto vmbr1
iface vmbr1 inet static
        address  10.1.1.1
        netmask  255.255.0.0
        bridge-ports none
        bridge-stp off
        bridge-fd 0
        bridge_maxwait 0

openaspace · Sep 13, 2021

spirit said:
auto enp2s0 iface enp2s0 ... .... post-up ebtables -I FORWARD -o enp2s0 -p IPv4 --among-src ! 00:50:56:15:14:e5,d4:3d:7e:da:f0:03 -j

nothing...
I have rebooted the server... for test.. and new network mac address abuse received from hetzner....

tcpdump for these mac address don't report any connection in/out
I need to add the ebtables rules also for each virtual device?


 ebtables -L
Bridge table: filter

Bridge chain: INPUT, entries: 0, policy: ACCEPT

Bridge chain: FORWARD, entries: 1, policy: ACCEPT
-j PVEFW-FORWARD

Bridge chain: OUTPUT, entries: 0, policy: ACCEPT

Bridge chain: PVEFW-FORWARD, entries: 3, policy: ACCEPT
-p IPv4 -j ACCEPT
-p IPv6 -j ACCEPT
-o fwln+ -j PVEFW-FWBR-OUT

Bridge chain: PVEFW-FWBR-OUT, entries: 4, policy: ACCEPT
-i tap100i0 -j tap100i0-OUT
-i tap200i0 -j tap200i0-OUT
-i veth110i0 -j veth110i0-OUT
-i veth114i0 -j veth114i0-OUT

Bridge chain: tap100i0-OUT, entries: 2, policy: ACCEPT
-s ! 0:50:56:0:84:12 -j DROP
-j ACCEPT

Bridge chain: tap200i0-OUT, entries: 2, policy: ACCEPT
-s ! 0:50:56:0:b8:95 -j DROP
-j ACCEPT

Bridge chain: veth110i0-OUT, entries: 2, policy: ACCEPT
-s ! 0:50:56:1:2:62 -j DROP
-j ACCEPT

Bridge chain: veth114i0-OUT, entries: 2, policy: ACCEPT
-s ! 0:50:56:0:b8:8c -j DROP
-j ACCEPT


auto lo
iface lo inet loopback

iface enp2s0 inet manual
post-up ebtables -I FORWARD -o enp2s0 -p IPv4 --among-src ! d4:3d:7e:d8:bd:c5,00:50:56:00:B1:05,00:50:56:00:84:12 -j

spirit · Sep 13, 2021

use enp0s31f6 instead enp2s0

openaspace · Sep 13, 2021

spirit said:
use enp0s31f6 instead enp2s0

What is the meaning of this answer

spirit · Sep 13, 2021

openaspace said:
What is the meaning of this answer

sorry, I read the post from "Undergrid", and I thinked it was you

you need "auto enp2s0" before "iface enp2s0 inet manual"

arhimede · Sep 13, 2021

I have the same situation today .

5 servers at Hetzner
all 5 running Proxmox 6.4 latest version
after today's Proxmox upgrade and reboot, I got the MAC abuse report from Hetner for all 5 machines.

Indeed , the result of

Code:

ifconfig -a

on one Proxmox server shows different MAC addresses then the original ones for all 3 virtual interfaces
fwln100i0
fwbr102i0
fwbr103i0

( i have 3 LXC containers on that machine )

spirit · Sep 13, 2021

arhimede said:
I have the same situation today .

5 servers at Hetzner
all 5 running Proxmox 6.4 latest version
after today's Proxmox upgrade and reboot, I got the MAC abuse report from Hetner for all 5 machines.

Indeed , the result of

Code:

ifconfig -a

on one Proxmox server shows different MAC addresses then the original ones for all 3 virtual interfaces
fwln100i0
fwbr102i0
fwbr103i0

( i have 3 LXC containers on that machine )

fwlnX,fwbrX are internal firewall bridge, without any ip, so they shouldn't send traffic.
does the mac abuse report of hetner have the macs of theses interfaces ?

arhimede · Sep 13, 2021

spirit said:
fwlnX,fwbrX are internal firewall bridge, without any ip, so they shouldn't send traffic.
does the mac abuse report of hetner have the macs of theses interfaces ?

Yes, Hetzner abuse report have the "abusive" macs

and are the exact ones listed in fwbr102i0 and fwln102i0

spirit · Sep 13, 2021

arhimede said:
Yes, Hetzner abuse report have the "abusive" macs

and are the exact ones listed in fwbr102i0 and fwln102i0

interesting, maybe it's another bug here. in your firewall rules (an default actions), do you use reject or drop ?

arhimede · Sep 13, 2021

interesting, maybe it's another bug here. in your firewall rules (an default actions), do you use reject or drop ?
I have no rules in firewall, other then default ones

But in firewall logs i have something new, from this morning

0 5 - 13/Sep/2021:00:00:01 +0000 starting pvefw logger
0 5 - 13/Sep/2021:09:20:52 +0000 received terminate request (signal)
0 5 - 13/Sep/2021:09:20:52 +0000 stopping pvefw logger
0 5 - 13/Sep/2021:09:21:38 +0000 starting pvefw logger

openaspace · Sep 14, 2021

After the latest kernel upgrade and the server reboot, no abuse mac messagese in the last 2 hours.

arhimede · Sep 14, 2021

openaspace said:
After the latest kernel upgrade and the server reboot, no abuse mac messagese in the last 2 hours.

Hetzner ?
Proxmox 6.4-13 ?

openaspace · Sep 15, 2021

arhimede said:
Hetzner ?
Proxmox 6.4-13 ?

Virtual Environment 6.4-13 - Linux px3 5.4.140-1-pve #1 SMP PVE 5.4.140-1
Yes, Hetzner.

After the latest proxmox upgrade, one hour ago the support answered me that they see now only the allowed mac address.
I will try to restart the server newly now.. to verify if some mac address can communicate for some seconds at the server boot time first of the ebtables rules are applyed.

openaspace · Sep 15, 2021

"NO LUCK".. to became crazy...!

Proxmox Stuff, please find a solutions for this big problem that is common to all user's running proxmox on Hetzner datacenter in bridged mode.

After a server restart new abuse message:
> Unallowed MACs:

> 02:41:a5:d2:f0:05
> 1a:be:49:df:3d:c5
> 82:6d:e7:0e:c1:03
> c2:0b:f3:8e:55:8b

From TCPDUMP no in/out traffic for the unallowed MACs after the server completely running.
-----------------------------------------------------------------
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: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr0 state UP group default qlen 1000
link/ether d4:3d:7e:d8:bd:c5 brd ff:ff:ff:ff:ff:ff
3: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether d4:3d:7e:d8:bd:c5 brd ff:ff:ff:ff:ff:ff
inet xxx.xxx.xxx.xxx peer xx.xxx.xxx.xxx/32 brd xxx.xxx.xxx.xxx scope global vmbr0
valid_lft forever preferred_lft forever
inet6 fe80::d63d:7eff:fed8:bdc5/64 scope link
valid_lft forever preferred_lft forever
4: vmbr1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 46:30:c3:9a:bc:ff brd ff:ff:ff:ff:ff:ff
inet 192.168.30.0/24 brd 192.168.30.255 scope global vmbr1
valid_lft forever preferred_lft forever
inet6 fe80::a808:c1ff:fe3b:ea4d/64 scope link
valid_lft forever preferred_lft forever
5: vmbr2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 36:1f:84:67:92:9e brd ff:ff:ff:ff:ff:ff
inet 192.168.40.0/24 brd 192.168.40.255 scope global vmbr2
valid_lft forever preferred_lft forever
inet6 fe80::1c01:b9ff:fefa:2ace/64 scope link
valid_lft forever preferred_lft forever
6: tailscale0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1280 qdisc pfifo_fast state UNKNOWN group default qlen 500
link/none
inet 100.76.25.74/32 scope global tailscale0
valid_lft forever preferred_lft forever
inet6 fd7a:115c:a1e0:ab12:4843:cd96:624c:194a/128 scope global
valid_lft forever preferred_lft forever
inet6 fe80::cd90:7f8c:dce0:763/64 scope link stable-privacy
valid_lft forever preferred_lft forever
7: tap117i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr1 state UNKNOWN group default qlen 1000
link/ether 46:30:c3:9a:bc:ff brd ff:ff:ff:ff:ff:ff
8: tap117i1: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr2 state UNKNOWN group default qlen 1000
link/ether 36:1f:84:67:92:9e brd ff:ff:ff:ff:ff:ff
9: tap100i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq master fwbr100i0 state UNKNOWN group default qlen 1000
link/ether 2e:35:5d:bd:fc:51 brd ff:ff:ff:ff:ff:ff
10: fwbr100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 82:6d:e7:0e:c1:03 brd ff:ff:ff:ff:ff:ff
11: fwpr100p0@fwln100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
link/ether d6:f7:07:49:4f:ce brd ff:ff:ff:ff:ff:ff
12: fwln100i0@fwpr100p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr100i0 state UP group default qlen 1000
link/ether 82:6d:e7:0e:c1:03 brd ff:ff:ff:ff:ff:ff
13: veth110i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr110i0 state UP group default qlen 1000
link/ether fe:6c:4e:4a:6d:23 brd ff:ff:ff:ff:ff:ff link-netnsid 0
14: fwbr110i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether c2:0b:f3:8e:55:8b brd ff:ff:ff:ff:ff:ff
15: fwpr110p0@fwln110i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
link/ether 96:51:af:17:c4:c9 brd ff:ff:ff:ff:ff:ff
16: fwln110i0@fwpr110p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr110i0 state UP group default qlen 1000
link/ether c2:0b:f3:8e:55:8b brd ff:ff:ff:ff:ff:ff
17: veth110i1@if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr2 state UP group default qlen 1000
link/ether fe:df:62:4a:a2:5a brd ff:ff:ff:ff:ff:ff link-netnsid 0
18: veth114i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr114i0 state UP group default qlen 1000
link/ether fe:d6:8f:d7:31:25 brd ff:ff:ff:ff:ff:ff link-netnsid 1
19: fwbr114i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 1a:be:49:df:3d:c5 brd ff:ff:ff:ff:ff:ff
20: fwpr114p0@fwln114i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
link/ether b2:6e:35:51:e3:b6 brd ff:ff:ff:ff:ff:ff
21: fwln114i0@fwpr114p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr114i0 state UP group default qlen 1000
link/ether 1a:be:49:df:3d:c5 brd ff:ff:ff:ff:ff:ff
22: tap200i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq master fwbr200i0 state UNKNOWN group default qlen 1000
link/ether 4a:15:08:d2:b2:e8 brd ff:ff:ff:ff:ff:ff
23: fwbr200i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 02:41:a5:d2:f0:05 brd ff:ff:ff:ff:ff:ff
24: fwpr200p0@fwln200i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
link/ether d6:cf:e3:8f:dd:bb brd ff:ff:ff:ff:ff:ff
25: fwln200i0@fwpr200p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr200i0 state UP group default qlen 1000
link/ether 02:41:a5:d2:f0:05 brd ff:ff:ff:ff:ff:ff

arhimede · Sep 15, 2021

Quick fix from Hetner support

as workaround, you can add a rule to drop port 43, it should work.

Proxmox generate 2 mac address visibile on the switch not allowed by the data center

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