Hello bird-users list, I am seeking input into if anyone can provide suggestions on how to debug the below described error message. Cheers, Chriztoffer ********************************************************** The two proxmox nodes are running bird2 2.13.1 (compiled using apkg) and are connected to a MikroTik Router running RouterOS 7.11 directly on the same L2 domain. All three nodes can talk directly to each other on the same L2 domain. When trying to establish the OSPFv3 IPv6 connections between the three nodes. The connection from the two Proxmox nodes to the MikroTik Router fails with error "wrong authentication length" when logged by bird2. The OSPFv2 (IPv4) connection succeeds between all three nodes. OSPFv2 and OSPFv3 and setup with the same auth type (hmac sha512; cryptographic) and auth-id (0). Looking at the bird2 source code [0] did not really give me any clue to what the error is. [0]: https://gitlab.nic.cz/labs/bird/-/blob/master/proto/ospf/packet.c#L219 From looking at the PCAP I do indeed see the auth-data is not of the same length. ## MikroTik (MAC OUI 4c:5e:0c) OSPF Authentication Trailer Authentication Type: HMAC Cryptographic Authentication (1) Authentication Data Length: **64** Reserved: 0x0000 Security Association Identifier (SA ID): 0x0000 Cryptographic Sequence Number: 71479 Authentication Data: 021d5635eac7b92d28bfad6507bcda7702a5f1e323197be18d42d436dcae998f5ae462da… ## Bird 2.13.1 (MAC OUI 70:54:d2) OSPF Authentication Trailer Authentication Type: HMAC Cryptographic Authentication (1) Authentication Data Length: **80** Reserved: 0x0000 Security Association Identifier (SA ID): 0x0000 Cryptographic Sequence Number: 405 Authentication Data: 95c0ecfcd54a50e0da70acbf242181d3f45fce7dd1d8b6ccdb783d96c319c49e0cb77e5e… In this instance. I assume the error is located with MikroTik RouterOS 7.11 (stable). But still wanting to solicit feedback via the bird-users list regardless. ********************************************************** # ASCII L2 Diagram MikroTik -- Proxmox-2 | / | / Proxmox-1 # ASCII L1 Diagram MikroTik -- Proxmox-2 | | Proxmox-1 ********************************************************** # Proxmox 8 node 1 2023-08-19 19:47:15.579Z <AUTH> ospf3_main: Authentication failed for nbr {{MikroTik}} on vmbr0 - wrong authentication length (64) # Proxmox 8 node 2 2023-08-19 19:46:55.581Z <AUTH> ospf3_main: Authentication failed for nbr {{MikroTik}} on vmbr0 - wrong authentication length (64) # MikroTik { version: 3 router-id: {{MikroTik}} } ospf3-backbone { 0.0.0.0 } interface { broadcast fe80::4e5e:cff:fexx:xxxx%bridge1 } corrupted auth trailer from fe80::7254:d2ff:fexx:xxxx%bridge1 ********************************************************** # MikroTik RouterOS 7.11 (stable) OSPFv6 IPv6 configuration /routing ospf instance add disabled=no in-filter-chain=v6private name=ospf3-main \ originate-default=if-installed out-filter-chain=ospf3-out redistribute=\ connected,static,dhcp router-id=loopback routing-table=main version=3 /routing ospf area add disabled=no instance=ospf3-main name=ospf3-backbone /routing ospf interface-template add area=ospf3-backbone auth=sha512 \ auth-id=0 auth-key=Zzma9IOrDa7pg9iJwi439nfIZ59oQsXeZBdNb-Upj631GG8 \ dead-interval=20s disabled=no \ hello-interval=5s interfaces=bridge1 retransmit-interval=2s ********************************************************** # Bird 2.13.1 OSPFv6 (IPv6) configuration on Proxmox 8.x (Debian 12) protocol ospf v3 ospf3_main { graceful restart on; graceful restart time 300; ipv6 { import all; export filter { if is_self_network_6() && source ~ [RTS_STATIC] then accept; else reject; }; }; area 0 { interface "vmbr0" { type broadcast; hello 5; retransmit 2; wait 10; dead 20; authentication cryptographic; password "Zzma9IOrDa7pg9iJwi439nfIZ59oQsXeZBdNb-Upj631GG8" { id 0; algorithm hmac sha512; }; check link on; }; interface "lo" { check link no; strict nonbroadcast yes; type pointopoint; }; interface "*" { stub; }; }; } ********************************************************** # PCAP https://drive.google.com/file/d/1wDimK0WppM6JvIJIEeEMmFfvllGjj54Q/view?usp=s...