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Guide

Feb 26, 2021

Solved

Gbit Ethernet Flow Control on RN104

Hello Community, I have a question to my ReadyNAS RN104 running at FW level 6.10.4. When I look into the network interface settings, there's no information about flow control for Gbit Ethernet adap...

StephenB

Feb 26, 2021

HolgerGT86 wrote:

I cannot figure out if flow control is enabled or disabled.

Is there a way to find this out?

You have to use ssh (ethtool). I see this on my RN102:

root@RN102:~# ethtool eth0
Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
                                             1000baseT/Full
        Link partner advertised pause frame use: Symmetric
        Link partner advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: g
        Wake-on: d
        Link detected: yes

This says that pause frames (ethernet flow control) are not supported. FWIW, it is supported (and enabled) on my x86 ReadyNAS.

StephenB

Guru - Experienced User

Feb 26, 2021

HolgerGT86 wrote:

I cannot figure out if flow control is enabled or disabled.

Is there a way to find this out?

You have to use ssh (ethtool). I see this on my RN102:

root@RN102:~# ethtool eth0
Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
                                             1000baseT/Full
        Link partner advertised pause frame use: Symmetric
        Link partner advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: g
        Wake-on: d
        Link detected: yes

This says that pause frames (ethernet flow control) are not supported. FWIW, it is supported (and enabled) on my x86 ReadyNAS.

HolgerGT86
Guide
Mar 11, 2021
Hi StephenB,
many thanks for your reply and sorry for my delayed response. My RN104 set the RAID5 volume to read only resulting from a filesystem failure and I had to start over and restore from backup. I was tied up by doing the recovery. All good now.

Have a great day,
Holger