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Allthough all Proxmox VMs/LXCs receive a valid GUA and have a correct routing table, some VMs (notably Debian12 and Ubuntu) can't reach anything beyond LAN IPv6s.
LXC container work fine as well as VMs deployed from the ISO image
Setup
Hetzner dedicated server with two public IPs and one /64 subnet
two bridges in a routed setup vmbr0 (primary public IPv4) and vmbr1
OPnsense VM vtnet0 (second public IPv4 and static IPv6) <-> vmbr0 WAN
vtnet1 (10.10.1.1/24 and a static IPv6 <-> vmbr1 LAN
Proxmox Host reachable through primary IP
OPnsene Route Advertisments Assited
Troubleshooting steps
tried Kernel 6.8 and 6.11
disabled multicast snooping on bridges
fw policy permissive
a tcpdump on the proxmox host, VM, and opnsense shows following:
on the proxmox host I see packets IN/OUT (also on the tap interfaces) with some ICMP6, destination unreachable, unreachable address from the IPv6 of the WAN interface
on opnsense I do see the replies on the WAN interface but on the LAN not anymore
on the VM only the generated icmp requests and NS traffic from link local address to opnsense link local
the ndp table on opnsense shows incomplete for the VM IPv6
Anyway, I'm pretty lost as other VMs installed from ISO images and LXC container (through helper scripts) work flawlessly
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Summary
Allthough all Proxmox VMs/LXCs receive a valid GUA and have a correct routing table, some VMs (notably Debian12 and Ubuntu) can't reach anything beyond LAN IPv6s.
LXC container work fine as well as VMs deployed from the ISO image
Setup
vtnet1 (10.10.1.1/24 and a static IPv6 <-> vmbr1 LAN
Troubleshooting steps
Anyway, I'm pretty lost as other VMs installed from ISO images and LXC container (through helper scripts) work flawlessly
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