Proxmox Loopback on port

S

somnath31

Member
Oct 9, 2020
13
0
6
32
Hello!
Today my DC said "My ports just made an ethernet loop."

At the moment of happening we saw lots of MACs on your port that normally do not belong to you (see the listing below).

>display mac-address interface ge 1/0/29 Flags: * - Backup BD : bridge-domain Age : dynamic MAC learned time in seconds ------------------------------------------------------------------------------- MAC Address VLAN/VSI/BD Learned-From Type Age ------------------------------------------------------------------------------- 000c-2920-49ee 40/- GE1/0/29 dynamic 412 000c-2929-24a4 40/- GE1/0/29 dynamic 411 000c-299d-5be3 40/- GE1/0/29 dynamic 411 0012-00c3-d580 40/- GE1/0/29 dynamic 402 0015-5d01-011e 40/- GE1/0/29 dynamic 413 0015-5d05-e8eb 40/- GE1/0/29 dynamic 412 0015-5d0a-8c57 40/- GE1/0/29 dynamic 413 0015-5dc9-0c06 40/- GE1/0/29 dynamic 412 0016-3c1b-df83 40/- GE1/0/29 dynamic 412 0016-3ca8-05c7 40/- GE1/0/29 dynamic 412 0016-3cb3-4709 40/- GE1/0/29 dynamic 413 0016-3cc7-fe7c 40/- GE1/0/29 dynamic 410 0016-3e5d-a838 40/- GE1/0/29 dynamic 409 0016-3e6d-106a 40/- GE1/0/29 dynamic 409 0019-b9ea-5487 40/- GE1/0/29 dynamic 393 001c-4224-a402 40/- GE1/0/29 dynamic 409 0023-5daa-1441 40/- GE1/0/29 dynamic 401 0025-9000-ad8b 40/- GE1/0/29 dynamic 398 0025-9059-c01a 40/- GE1/0/29 dynamic 412 0025-9084-b852 40/- GE1/0/29 dynamic 406 0025-9084-c7a2 40/- GE1/0/29 dynamic 411 0025-9087-baba 40/- GE1/0/29 dynamic 378 0025-908b-1a08 40/- GE1/0/29 dynamic 406 0025-908b-4d35 40/- GE1/0/29 dynamic 410 0025-90ab-1ee9 40/- GE1/0/29 dynamic 406 0025-90ab-1f03 40/- GE1/0/29 dynamic 409 0025-90ab-206e 40/- GE1/0/29 dynamic 401 0025-90d6-0a92 40/- GE1/0/29 dynamic 411 0025-90d8-e353 40/- GE1/0/29 dynamic 408 0025-90d9-5d75 40/- GE1/0/29 dynamic 392 0026-5586-b097 40/- GE1/0/29 dynamic 411 0050-56a8-dd8f 40/- GE1/0/29 dynamic 10621 0060-2faf-56e9 40/- GE1/0/29 dynamic 411 0800-27aa-8a98 40/- GE1/0/29 dynamic 409 0cc4-7a02-233a 40/- GE1/0/29 dynamic 408 0cc4-7a02-d51a 40/- GE1/0/29 dynamic 412 0cc4-7a22-2916 40/- GE1/0/29 dynamic 407 0cc4-7a78-e99c 40/- GE1/0/29 dynamic 409 0cc4-7a7a-3022 40/- GE1/0/29 dynamic 410 0cc4-7aa4-7c14 40/- GE1/0/29 dynamic 409 0cc4-7ae2-2fff 40/- GE1/0/29 dynamic 411 0ef0-240a-45d1 40/- GE1/0/29 dynamic 1380985 1219-f8b8-b764 40/- GE1/0/29 dynamic 409 1285-a01b-7174 40/- GE1/0/29 dynamic 1538925 14fe-b5d9-5ad9 40/- GE1/0/29 dynamic 413 1626-a581-a0f2 40/- GE1/0/29 dynamic 1205288 16eb-95a8-fba1 40/- GE1/0/29 dynamic 2433548 1803-73ec-8649 40/- GE1/0/29 dynamic 411 1803-73ef-7ab4 40/- GE1/0/29 dynamic 411 18a9-054f-aa76 40/- GE1/0/29 dynamic 407 18a9-0552-87b2 40/- GE1/0/29 dynamic 410 18e8-292b-cc41 40/- GE1/0/29 dynamic 409 1ac6-6405-d869 40/- GE1/0/29 dynamic 999030 1c74-0dc3-7987 40/- GE1/0/29 dynamic 410 1caa-077e-81c2 40/- GE1/0/29 dynamic 401 2221-b829-ee38 40/- GE1/0/29 dynamic 1116386 2e81-d563-f0ce 40/- GE1/0/29 dynamic 407 2e98-4ab9-11cf 40/- GE1/0/29 dynamic 412 325a-c286-2086 40/- GE1/0/29 dynamic 2204220 32fb-c185-79fe 40/- GE1/0/29 dynamic 2433547 3863-bb44-2208 40/- GE1/0/29 dynamic 411 3a70-7944-be7b 40/- GE1/0/29 dynamic 987355 3cec-ef88-3688 40/- GE1/0/29 dynamic 411 420c-4900-cdc8 40/- GE1/0/29 dynamic 412 4255-12af-7bb6 40/- GE1/0/29 dynamic 764765 469b-a8f6-9885 40/- GE1/0/29 dynamic 2412606 46dc-de9f-fa8c 40/- GE1/0/29 dynamic 703961 4af4-6844-ca6c 40/- GE1/0/29 dynamic 706574 4c52-6216-31ca 40/- GE1/0/29 dynamic 410 4e3a-fec9-0621 40/- GE1/0/29 dynamic 411 5254-005a-e0d7 40/- GE1/0/29 dynamic 413 5254-0063-d868 40/- GE1/0/29 dynamic 412 5254-0066-3e99 40/- GE1/0/29 dynamic 412 5254-0084-0061 40/- GE1/0/29 dynamic 404 5254-00a5-a7f3 40/- GE1/0/29 dynamic 411 5254-00f0-8c79 40/- GE1/0/29 dynamic 410 5254-00fa-1718 40/- GE1/0/29 dynamic 409 564d-88d5-44fa 40/- GE1/0/29 dynamic 707680 5677-6c52-ea65 40/- GE1/0/29 dynamic 2433544 5a8b-4072-b60f 40/- GE1/0/29 dynamic 1132171 5a93-b02c-e2ae 40/- GE1/0/29 dynamic 413 5ea7-c0ca-31eb 40/- GE1/0/29 dynamic 1126224 622c-243f-b978 40/- GE1/0/29 dynamic 2433543 62fd-c482-0e2f 40/- GE1/0/29 dynamic 2349954 66bf-dd1e-11c1 40/- GE1/0/29 dynamic 703342 6c3b-6bf4-c2cc 40/- GE1/0/29 dynamic 412 6e0e-f51c-0ce8 40/- GE1/0/29 dynamic 707095 7486-7adf-f94c 40/- GE1/0/29 dynamic 407 74a2-e6af-d72f 40/- GE1/0/29 dynamic 403 761b-e4a9-f8d8 40/- GE1/0/29 dynamic 2074642 762a-5ec4-2e02 40/- GE1/0/29 dynamic 982382 76ee-1221-8781 40/- GE1/0/29 dynamic 708330 782b-cb16-1a79 40/- GE1/0/29 dynamic 410 7c5a-1c62-4535 40/- GE1/0/29 dynamic 410 82a8-cd95-647b 40/- GE1/0/29 dynamic 411 82f2-0cb2-1ff7 40/- GE1/0/29 dynamic 1678271 847b-ebd9-c7b8 40/- GE1/0/29 dynamic 411 847b-ebf6-feca 40/- GE1/0/29 dynamic 411 86ec-1d0e-8b01 40/- GE1/0/29 dynamic 2205716 8e07-ae2e-18e7 40/- GE1/0/29 dynamic 2433560 906c-ac09-4af6 40/- GE1/0/29 dynamic 410 925e-f1ca-2702 40/- GE1/0/29 dynamic 411 929d-068b-e7af 40/- GE1/0/29 dynamic 696467 94c6-9114-dbc4 40/- GE1/0/29 dynamic 412 9620-46e2-b0ce 40/- GE1/0/29 dynamic 411 9ad3-338d-1961 40/- GE1/0/29 dynamic 412 9ee9-a4aa-3390 40/- GE1/0/29 dynamic 131437 a036-9f67-4a35 40/- GE1/0/29 dynamic 409 a252-e238-74f9 40/- GE1/0/29 dynamic 699482 a69d-5bed-e8b2 40/- GE1/0/29 dynamic 412 aa46-6b5b-722e 40/- GE1/0/29 dynamic 2076701 aab3-9560-ba9f 40/- GE1/0/29 dynamic 980944 ac1f-6b3c-cf92 40/- GE1/0/29 dynamic 413 ac1f-6bb5-3e90 40/- GE1/0/29 dynamic 2433621 ac1f-6bb8-c89c 40/- GE1/0/29 dynamic 2433823 b22c-ec95-b179 40/- GE1/0/29 dynamic 739456 b28d-fa3a-cb4c 40/- GE1/0/29 dynamic 2168337 b8ac-6f14-a20e 40/- GE1/0/29 dynamic 412 ba5b-cac0-fbee 40/- GE1/0/29 dynamic 1677172 ba7e-5750-4f08 40/- GE1/0/29 dynamic 413 bacd-8552-21a3 40/- GE1/0/29 dynamic 405 bc30-5be5-fce9 40/- GE1/0/29 dynamic 410 bc30-5bea-3f5d 40/- GE1/0/29 dynamic 406 c210-5c4f-07a4 40/- GE1/0/29 dynamic 413 c81f-66f6-e856 40/- GE1/0/29 dynamic 410 ca6e-f370-9972 40/- GE1/0/29 dynamic 412 cad6-c6fa-c5d8 40/- GE1/0/29 dynamic 1205348 cebb-2196-550b 40/- GE1/0/29 dynamic 411 d20b-7136-97bd 40/- GE1/0/29 dynamic 411 d220-fa71-b1db 40/- GE1/0/29 dynamic 192026 d277-d8a9-83af 40/- GE1/0/29 dynamic 1205320 d2ad-6910-64e0 40/- GE1/0/29 dynamic 349 d4be-d9fa-76a9 40/- GE1/0/29 dynamic 412 da33-2005-e543 40/- GE1/0/29 dynamic 707323 da82-8ca1-311e 40/- GE1/0/29 dynamic 2433534 de18-1fdf-b4fd 40/- GE1/0/29 dynamic 1205261 deee-bebe-3c3c 40/- GE1/0/29 dynamic 703689 e063-da54-bc30 40/- GE1/0/29 dynamic 411 e0db-551f-9e44 40/- GE1/0/29 dynamic 405 e2f3-fec0-c92f 40/- GE1/0/29 dynamic 412 e4c7-22e8-96ae 40/- GE1/0/29 dynamic 384 e690-22e3-0586 40/- GE1/0/29 dynamic 412 ea59-c267-ff61 40/- GE1/0/29 dynamic 413 ea77-355a-a956 40/- GE1/0/29 dynamic 1539330 f2a0-9644-fdce 40/- GE1/0/29 dynamic 411 f403-4356-c2d4 40/- GE1/0/29 dynamic 411 f8bc-1248-b020 40/- GE1/0/29 dynamic 411 fad4-4583-d207 40/- GE1/0/29 dynamic 412 -------------------------------------------------------------------------------

Most likely you have several bridges on your proxmox with VMs added to multiple of them. At some point some vms just pass the traffic between the bridges and it returns the packets back to our network.

Anyone know what's happening?

The Host server have only one bridge vmbr0

Like this

auto lo iface lo inet loopback iface eno1 inet manual auto vmbr0 iface vmbr0 inet static address 192.168.10.2/24 gateway 192.168.10.1 bridge-ports eno1 bridge-stp off bridge-fd 0
 
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