NAS and iMac defaulting to 1gb not 10gbe when both plugged in...

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NAS and iMac defaulting to 1gb not 10gbe when both plugged in...

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This is beginner's question, probably!

I have recently started using a Synology DS1618+ NAS with my 2013 iMac Pro. I have installed a Synology E10G18-T1 10 gbe PCI card into the NAS and am connecting to my iMac using a Sonnet Solo Thunderbolt2-10gbe adapter.

The NAS is also connected via LAN1 to my router (an ISP-provided 'Virgin superhub'). The router is connected to the standard RJ45 port on my iMac.

The problem I am having is that either the Mac or the NAS, or both, seems to be prioritising the 1gbe connection and not the 10gbe Thgunderbolt connection when both are connected.

When I pull the LAN1 out of the back of the NAS, I get 10gbe speeds as it seems to default to the 10gbe PCI card....

How do I solve this and come up with a solution that allows me to work at home at 10gbe but still access the NAS remotely at 1gbe?

Thank you!!
 

Rusty

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Welcome.

Guessing that you have interface order on your mac to have 10G as its primary adapter?

Are both 1 and 10G adapters in the same network subnet?
 

fredbert

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How have you configured the IP addressing on the 10G direct connection? And how are you addressing the NAS from the Mac?

I don't think you'd want to prioritise the 10G Mac interface over the 1G because mostly that will affect Internet access. But you should use addressing to the NAS that uses the IP connection of the 10G link.

I bet if you resolve whichever name you are using for the NAS (mynas.local) it will be an address on the 1G subnet.
 
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How have you configured the IP addressing on the 10G direct connection? And how are you addressing the NAS from the Mac?

I have no idea! Not sure how to change these things.

I've tried finding some local companies who do know what they are doing, or claim to, and they argue I need a switch. Which I don't believe.
 

jeyare

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Last edited:
The NAS is also connected via LAN1 to my router (an ISP-provided 'Virgin superhub'). The router is connected to the standard RJ45 port on my iMac.

The problem I am having is that either the Mac or the NAS, or both, seems to be prioritising the 1gbe connection and not the 10gbe Thgunderbolt connection when both are connected.

As I understand you have connected 10G interfaces of NAS and Mac over 1G interface in the router. Correct?
or you have direct connection between NAS and Mac (no router, no switch) over 10G interface and you setup different LAN for such communication in the NAS and you found such IP address (from such LAN range) and you connect such NAS over 10G interface.
 

fredbert

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Last edited:
What I read is (basically a triangular connection):
  • Mac (built-in 1G) to router's LAN switch (1G port)
  • NAS (built-in 1G) to router's LAN switch (1G port)
  • Mac (Thunderbolt cable to 10G) to NAS (add-on 10G)
The router's DHCP will be assigning IP on the 1G LAN: either dynamic IP or reserved for each device (to ensure the same IP is always assigned).

There is probably a self-assigned IP on the Mac and NAS 10G interfaces (in range 169.254.0.0/16). But probably most NAS services are advertising on the 1G IP addresses, in which case the Mac will access via the 1G connection.

If the 1G connection is disconnected then the NAS will be advertising on the 10G connection. Also, if the Mac has it's 1G disconnected then it will default to the 10G.

Being Virgin Media then the default LAN subnet is 192.168.0.0/24. If you had it running in modem (bridge) mode and use your own Internet router (e.g. Synology RT2600ac) then there will still be a 192.168.100.0/24 subnet between the VM router and you router's WAN port (so the VM router can be managed).

So let's assume you have to avoid subnets 192.168.0.0/24, 192.168.100.0/24, and the other normal one 192.168.1.0/24. We can choose another subnet that you don't use/won't ever normally use in the 192.168.0.0-192.168.255.0.

Let's choose 192.168.200.0/24 since it's far enough away from where most things will select a default range (the NAS's VPN Server etc) and configure the Mac and NAS 10G interfaces to use this, as a secondary connection. The primary connection, 1G, will still access the Internet, be used for DNS (resolving URLs to IP addresses), and all other connectivity. The 10G will be used for accessing the NAS by its 10G IP address.


Mac configuration

Launch System Preferences and open Network settings. If the bottom-left padlock is locked you must click it to unlock this panel. Select your Thunderbolt 10G interface and then click the Advanced button.

TCP/IP tab:​
  • Configure IPv4: Manually
  • IPv4 Address: 192.168.200.2
  • Subnet Mask: 255.255.255.0
  • Router (shouldn't matter): blank or 192.168.200.1
  • Click 'OK'
  • Click 'Apply'

NAS configuration

Lauch Control Panel and open Network settings. Select Network Interface tab. Select you 10G LAN interface and click Edit.

IPv4 tab:​
  • Select 'Use manual configuration'.
  • IP Address: 192.168.200.1
  • Subnet Mask: 255.255.255.0
  • Gateway (shouldn't matter): blank or 192.168.200.1
  • DNS Server: blank
  • Set as default gateway: Unticked

You now should be able to access the NAS consistently from the MAC using Finder's Connect to server (cmd-k) using afp://192.168.200.1 and smb://192.168.200.1. In fact any time you want to access the NAS on the 10G connection you just use 192.168.200.1 as the address. So https://192.168.200.1:5001 for the DSM portal on 10G, of course your web browser will complain that the certificate doesn't match but you can accept that asa you know this can only be the NAS.


You could buy a new network switch that has at least two 10G interfaces and some 1G. Then only use the 10G Mac and NAS interfaces to the switch's 10G ports and a 1G to the VM router. You wouldn't need the above manual 10G interface configuration but would use the VM router's DHCP service as you do today on the 1G interfaces.
 

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