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This is my output from "ifconfig -v mlxen0":

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mlxen0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: WAN (wan)
        options=8c00a8<VLAN_MTU,JUMBO_MTU,VLAN_HWCSUM,VLAN_HWTSO,LINKSTATE>
        ether 00:02:c9:c1:8c:b8
        media: Ethernet autoselect (10Gbase-CX4 <full-duplex,rxpause,txpause>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        plugged: SFP/SFP+/SFP28 10G Base-SR (LC)
        vendor:  PN:  SN: 2306210059 DATE: 2023-06-24
        module temperature: 159.00 C voltage: 0.45 Volts
        lane 1: RX power: 3.28 mW (5.15 dBm) TX bias: 108.96 mA

Some strange values ... but i do not expect much.

I connected a quite old Win10 PC with an Intel X550-T2 NIC to the same cable and got 7.8 GB/s (down) and 3.7GB/s (up). My line speed is 10GB/s, the cable is shielded and only half a meter in length. But I did the test with a server on the internet.

It looks like a tranceiver problem... Contacted ONTi, but they do not know of any problems: just plug and play. Maybe I should try an other tranceiver.

Thanks for the reply!
Didn't know about the CX4. Just saw it and read something about a twinax cable. I expect someting like 10GBase-T because I am using a RJ45 CAT7 cable. Tryed to change the ,,Speed" but the GUI has only the following options: CR4, CX4, SR and 1000base-T. Even with 1000base-T and a reboot it falls back to CX4.
I'am using a tranceiver from ONTi ONT-C1TE-R01. Ordered it from Aliexpress: https://www.aliexpress.com/i/4000340325163.html. Do you think I should try another tranceiver? Do you know a compatible tranceiver?

Thanks for the fast answer!

Here my output from ifconfig -a:

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igc0: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: ETH1 (opt2)
        options=4802028<VLAN_MTU,JUMBO_MTU,WOL_MAGIC,NOMAP>
        ether 00:f0:cb:fe:b0:df
        media: Ethernet autoselect
        status: no carrier
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
...
mlxen0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: WAN (wan)
        options=8c00a8<VLAN_MTU,JUMBO_MTU,VLAN_HWCSUM,VLAN_HWTSO,LINKSTATE>
        ether 00:02:c9:c1:8c:b8
        media: Ethernet autoselect (10Gbase-CX4 <full-duplex,rxpause,txpause>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
mlxen1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: LAN (lan)
        options=8c00a8<VLAN_MTU,JUMBO_MTU,VLAN_HWCSUM,VLAN_HWTSO,LINKSTATE>
        ether 00:02:c9:c1:8c:b9
        media: Ethernet autoselect (10Gbase-CX4 <full-duplex,rxpause,txpause>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
bridge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: OPT (opt1)
        ether 58:9c:fc:10:82:4b
        inet 192.168.xx.2 netmask 0xffffff00 broadcast 192.168.xx.255
        inet6 aaaa:bbbb:cccc:dddd:5a9c:fcff:fe10:824b prefixlen 64
        inet6 fe80::5a9c:fcff:fe10:824b%bridge0 prefixlen 64 scopeid 0xa
        id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
        maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
        root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
        member: mlxen0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 8 priority 128 path cost 2000
        member: mlxen1 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 9 priority 128 path cost 2000
        member: igc2 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 3 priority 128 path cost 2000000
        member: igc1 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 2 priority 128 path cost 2000000
        member: igc0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 1 priority 128 path cost 2000000
        groups: bridge
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>


On mlxen0 I read ,,full-duplex". Do you mean this?

Hi everybody

In my configuration I observe a strange behaviour, I can't understand. My setup is quite simple: I installed OPNSense on a R86S with 3x2.5G and 2x10G SFP+ ports. OPNSense is configured as transparent bridge with all ports. If I connect the bridge to my provider router from a 2.5G port I get 2.3Gbit/s for up and down, measured with speedtest from Ookla on the box. My provider router has a multi port and can deliver up to 10GBit/s. So this connection is limited by the line rate.
If I change the cable from the 2.5G port to the 10G SFP+ port (via a RJ45 module) I measure 7.7GBit/s as down and 1.1GBit/s as up. What I don't understand: Why is up lower with the faster port? Do I have to tweak settings on the Mellanox connectx-3 to increase uploads? I would be very happy about any help or hints.