2.5Gb connencted to 10Gb RJ45 SPF+ , I am doing something wrong?

[Zucca]

I have a EN2251 modem with 2.5Gb WAN.

Until now I was using it connected to an old 10Gb port (one of the six of a Supermicro X10SLH-N6-ST031 pfsense box) which can't do 2.5 and it was negotiating a 1Gb connection and done.

Because I wanted to see if I can do it and what will happen, I installed a Chelsio T520 CR T520-CR 10GbE 2-Port PCIe card in my pfsense box, because of this, and then slapped a 10Gtek 10GBase-T SFP+ to RJ-45 Transceiver (this one) with the Marvell AQR113C in it.

According to the spec, the Marvell AQR113C can do the 2.5 Gb.

After putting everything together here the observations:

- the pfsense box is reporting a 10Gb WAN connection to the 2.5 wan modem port
- every 2-3 hours I get high loss and/or high latency on the pfsense WAN. Of course my ISP see nothing on their side, everything is stable for them.

I have now reverted to 1Gb WAN pfsense to EN2251 and I am monitoring the situation.

Since the above are my first steps in the 10Gb planet, I am kindly asking for a sanity check.

Thanks.

[Zucca]

Update after some research

- the pfsense box is reporting a 10Gb WAN connection to the 2.5 wan modem port

It is expected since the Marvell AQR113C does not tell the OS which speed has negotiated.
pfSense only sees a 10Gb SPF+.

- every 2-3 hours I get high loss and/or high latency on the pfsense WAN. Of course my ISP see nothing on their side, everything is stable for them.
Same with the reverted 1Gb WAN connection, my ISP is a moron.

So if you ask me I was doing nothing wrong and my system is working properly.