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GS308T VLAN 802.1Q Tags missing in Egress from switch
I have a GS308T switch connected to two test hosts and a management device assd shown in the diagram. Port 5 is connected to Test Host 1, which is set to VLAN-tag all frames for VLAN ID 102. Port...
The issue was that windows removed VLAN tags from incoming packets before handing them to VMs.
The switch is fine, I just made the mistake of assuming that virtualization would bypass the VM Host's network stack.
g3 is not connected to anything, but Test Host 2 is on g6.
g5 (Test Host 1) is tagged on 101,102
- Test Host 1 is configured to transmit tagged frames
g6 (Test Host 2) is untagged on 102
- Test Host 2 expects/transmits untagged frames
Here's the table (since images aren't working in the post).
| Interface | PVID | VLAN member | VLAN Tag | Acceptable Frame | Ingress Filtering | Current Ingress Filtering | Untagged VLANs | Tagged VLANs | Forbidden VLANs | Dynamic VLANs | Port Priority |
| g1 | 1 | 1 | None | Admit All | Enable | Enable | 1 | None | None | None | 0 |
| g2 | 1 | 1 | None | Admit All | Enable | Enable | 1 | None | None | None | 0 |
| g3 | 101 | 101 | None | Admit Untagged Only | Enable | Enable | 101 | None | None | None | 0 |
| g4 | 1 | 1 | None | Admit All | Enable | Enable | 1 | None | None | None | 0 |
| g5 | 1 | 101-102 | 101-102 | VLAN Only | Enable | Enable | None | 101-102 | None | None | 0 |
| g6 | 102 | 102 | None | Admit Untagged Only | Enable | Enable | 102 | None | None | None | 0 |
| g7 | 1 | 1 | None | Admit All | Enable | Enable | 1 | None | None | None | 0 |
| g8 | 1 | 1 | None | Admit All | Enable | Enable | 1 | None | None | None | 0 |
The switch config looks perfectly fins - nothing complex. The test result however is certainly showing a problem, I would expect this packet to be tagged on it's way out, too.
The issue was that windows removed VLAN tags from incoming packets before handing them to VMs.
The switch is fine, I just made the mistake of assuming that virtualization would bypass the VM Host's network stack.
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