1GB shows 100MB

[Centosuser]

Hi guys

On My Lab i have 2 intel corporation 82574l gigabit network connection.

Lately noticed really slowness on the network,

i just figured out those two NICS on the vSwitchs shows the speed 100MB,

i tried to change one NIC from Auto negotiation to 1000Full duplex, some how its disconnect and doesn't comes back !

any suggestions why ?

[a_p_]

You'd usually either configure Auto Negotiation (recommended for GBit networks) or fixed speed/duplex on both sides, the NIC as well as the switch port. If Gigabit doesn't work although it should, this could be related to a driver/software issue (probably fixed by a host reboot), or bad network cables (GBit requires CAT5e or better), ...

André

[Centosuser]

Hi Andre

the Cable is CATe5,

if the physicall switch is 100 MB can cause this issue ?

the physicall switch where the ESXI connected too.

[a_p_]

Yes, if the Gigabit uplinks are connected to 100MBit/s ports on a physical switch, they will report 100MBit/s (the maximum possible speed).

André

[Centosuser]

Thank you Andre,

this is clarify the speed issue i have and also with the internet.

if i am on 100 MB switch, the internet speed will be poor right ?

upgrading to 1GB switch would be worth it .

[SCMHenry]

What is the maximum speed of the internet uplink to your ISP?

I would be surprised if it is 100Mbps or more... therefore I would suggest it is unlikely that your 100Mbps network links are creating a bottleneck for your internet traffic.

[craigyang]

exclude the cable, ISP problem, the worst case would be some thing wrong with your NIC.

so update the driver or even firmware to see if it get fixed.