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Forum Discussion
Changing MTU Size on a GS108PEv3
How do I change the MTU size on a GS108PEv3 managed switch? Neither the web browser nor the ProSafe Plus app allow me to change the MTU size on any of the ports.
By far not a managed switch, technically Plus switch, so unmanaged core with very few config options.
Technically a known limitation on these Plus switches is for the simple IP stack and NSDP protocol: Using a non-standard MTU on the computer network interface? Known limitation that MTU different from 1500 are not workable on these switches embedded controller IP stack. This makes it impossible accessing the Web UI.
These switches resp. the very basic controller IP stack isn't workable with non-standard reduced MTU. People operating VPNs for example often report the Plus Switch reachability failure (WebUI or the no longer supported Plus utility).
Some models show the globally supported MTU on the Web UI in the Port Status
Most if not all newer Plus switch models are allowing virtually any practically required Jumbo Frame size including multiple tags in the 9K range.
Since these are pure L2 switches, there is nothing the switch could actively do in case the allowed frame size is exceeded. Such frames would be simply dropped.
I was hoping I could disable jumbo frames and drop my MTU down for one of the ports. I am testing some dual tunnel VPN connections and not being able to disable jumbo frames and lowering the MTU is interfering with being able to connect to the inner tunnel.
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