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I have default proxmox install on Vultr baremetal server

It has bridge like this

root@ed2:~# cat /etc/network/interfaces
auto lo
iface lo inet loopback

iface enp1s0 inet manual

auto vmbr0
iface vmbr0 inet static
        address 66.42.104.XXX/23
        gateway 66.42.104.1
        bridge-ports enp1s0
        bridge-stp off
        bridge-fd 0


source /etc/network/interfaces.d/*

50% of time(EXACTLY) ip 66.42.104.XXX is not reachable from external world.

Same time it is reachable from any internal ip. Internal ips are public and accessable without issues from outside.

STP turned off. IPV6 turned off. iptables and ebtables show zero configuration.

Tcpdump can see incoming ping packets on vmbr0 when ip is unreachable.

What am I missing here?

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    1) What MAC address does vmbr0 have, 2) what MAC address does tcpdump show on the incoming ping packets, 3) what does IPv6 have to do with all of this?
    – grawity_u1686
    Commented Apr 4 at 5:37
  • Interesting point. I am not even sure how to check MAC using tcpdump, but I will check and update. There was idea that it respond to ipv6 default route.
    – arheops
    Commented Apr 4 at 12:21
  • Run it with the tcpdump -e option added; it'll then show both the source and destination MAC addresses.
    – grawity_u1686
    Commented Apr 4 at 12:39
  • Yes, thank you. It looks like half of the time, the packet go with Mac of VM. You can put that as answer, I will accept. Not solvable however, have to switch to routed config.
    – arheops
    Commented Apr 4 at 12:52

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