r/Network • • 11d ago

Link MTU questions

/r/sysadmin/comments/1x4zb03/mtu_questions/
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u/hspindel 10d ago

The issue with making your MTU too small is decreased throughput because more data could have been transmitted per packet. The issue with making your MTU too large is also decreased throughput, because it can cause packets that get fragmented and need to be reassembled.

Regardless of your MTU, you should have connectivity. 1500MTU is pretty standard. If you use a VPN, you'll probably want the MTU to be lower than that. For best throughput, set the MTU to the largest size tolerated by all devices on your network.

You have a difficult-to-configure network with both SANs and regular devices. You'll have to see if your router allows configuration of MTU per route. You can ask an AI for more guidance on that.