Yes, everything is on the same subnet.
There are two switches connected to the router (Fritz!Box 7490): The aforementioned D-Link DSG-108 and the TP-Link TL-SG108 (https://www.tp-link.com/at/products/details/cat-4763_TL-SG108.html). The TL-SG108 is connected to the NAS and some WLAN access points in my house. The D-Link is connected to the Vero 4K, the TV, the receiver, Raspi3 and PS4.
Before that I had the D-Link connected to the TP-Link but I changed that to see if it has any effect on the problem. It didn’t. I could try to shuffle things around so the NAS and the Vero 4K are connected to the same switch if you think that might help.
You’re right. I copied the ethtool command from here but I now see it disables auto-negotiation. With auto-negotiation disabled on the Vero4K, the other end should fall back to half duplex.
I think that would be a very useful test.
Now the Vero4K is connected directly to the switch the NAS is on (not really a long-term solution because that’s in the basement):
Connecting to host 192.168.0.199, port 5201
Reverse mode, remote host 192.168.0.199 is sending
[ 4] local 192.168.0.49 port 58064 connected to 192.168.0.199 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 54.2 MBytes 454 Mbits/sec
[ 4] 1.00-2.00 sec 71.5 MBytes 600 Mbits/sec
[ 4] 2.00-3.00 sec 94.1 MBytes 789 Mbits/sec
[ 4] 3.00-4.00 sec 93.4 MBytes 784 Mbits/sec
[ 4] 4.00-5.00 sec 79.0 MBytes 662 Mbits/sec
[ 4] 5.00-6.00 sec 73.6 MBytes 617 Mbits/sec
[ 4] 6.00-7.00 sec 59.0 MBytes 495 Mbits/sec
[ 4] 7.00-8.00 sec 100 MBytes 842 Mbits/sec
[ 4] 8.00-9.00 sec 110 MBytes 919 Mbits/sec
[ 4] 9.00-10.00 sec 105 MBytes 881 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 841 MBytes 705 Mbits/sec 2 sender
[ 4] 0.00-10.00 sec 840 MBytes 705 Mbits/sec receiver
Numbers are still all over the place. Already exchanged cables, so far this is the best I can get using rather short Cat.6 cables. Unfortunately from that position I can’t test the behaviour after having played back some files.
I’m getting some high quality Cat.7 on Tuesday so I will have another go then. I also took a look at the network settings of the NAS but nothing struck me as helpful.
If you repeat the same test with your PC as a client, using the same cable, then it’ll prove once and for all whether the problem is only with the Vero4K+.
If you try V4K to PC on the same (second) switch, it’ll help to eliminate (or otherwise) the switch as being the source of the problem.
Interestingly you only got two retries there. That’s suggesting there isn’t a hardware issue but a throughput limitation somewhere to me
I also connected my Ubuntu laptop to the same switch. Using that one as a server the Vero 4K shows consistent 954Mbps bandwidth. So the NAS seems to be the problem as my laptop, as a client to the NAS, shows comparable numbers to the Vero 4K.
Right now I’m not really sure how to solve this however 
What Synology model is it?
What is the current LAN’s MTU/Jumbo config in your NAS?
Where did you get your iperf3 stack from running on the Synology?
HI Sam
could it be related to the issues I had (which seemed heat related (so after full shutdown and waiting >10 mins), full speed, then playing movies to heat it up, lowered it by the minute… ?
forum pos:t Problems with Gigabit Ethernet on Vero 4K + - #151 by chfauc2
Did u get a chance to investigate my box ? 
tx
cr
@chfauc2 Please start your own thread outlining your symptoms fully and providing full logs. Please see How to submit a useful support request - General - OSMC. Your issue may not necessarily be related to the original poster’s, and to ensure that both they and you are able to get their issue resolved, we would like you to start a new thread for clarity.
It’s 1000 Mbps, Full dupley, MTU 1500. Are jumbo frames enabled as soon as I raise that value beyond a certain value? There’s no jumbo frames checkbox.
I did a manual package installation with the package provided here: https://www.kenrelax.com/synology-iperf3-performance-test/
I find it strange that this happend all of a sudden for more poeple, and that we have to look at cables and our home networks… Evertything was working fine for me until the latest Leia beta update and reverting back to the oficial august build.
My home network is 100% not the issue. It consists of high end Cisco wifi and switches, and all other devices are working at 100% their capacity, i.e. 1GB speeds on ethernet. WiFi devices also experience zero issues regarding to speed and timeouts or dropped connections.
Something must have changed inside the Vero4K+ since the Leia beta update.
@sid6581 Many thx for this info. Yes, the Syno starts Jumbo frames as soon as you choose another MTU size (see the edit button) in my screenshot. Also, iperf3 is fromt he source I would take.
@kzurburg I think the issue @sid6581 sees is a different since he could already isolate the issue to be on his NAS and his Vero4k+ and laptop behave the same. Always difficult if several parallel threads are handled in the same topic and afterwards it figures out to be different in nature.
@kzurburg Did you ever try updating to the latest version in staging?
@sam_nazarko gonna try this tonight.
Did the update now:
osmc@osmc:~$ iperf3 -c 192.168.178.200
Connecting to host 192.168.178.200, port 5201
[ 4] local 192.168.178.129 port 40329 connected to 192.168.178.200 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 112 MBytes 936 Mbits/sec 0 272 KBytes
[ 4] 1.00-2.00 sec 112 MBytes 939 Mbits/sec 0 272 KBytes
[ 4] 2.00-3.00 sec 110 MBytes 921 Mbits/sec 2 156 KBytes
[ 4] 3.00-4.00 sec 106 MBytes 891 Mbits/sec 1 133 KBytes
[ 4] 4.00-5.00 sec 110 MBytes 925 Mbits/sec 1 124 KBytes
[ 4] 5.00-6.00 sec 111 MBytes 930 Mbits/sec 1 113 KBytes
[ 4] 6.00-7.00 sec 111 MBytes 928 Mbits/sec 0 148 KBytes
[ 4] 7.00-8.00 sec 111 MBytes 934 Mbits/sec 1 127 KBytes
[ 4] 8.00-9.00 sec 109 MBytes 915 Mbits/sec 1 123 KBytes
[ 4] 9.00-10.00 sec 103 MBytes 870 Mbits/sec 2 100 KBytes
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 1.07 GBytes 919 Mbits/sec 9 sender
[ 4] 0.00-10.00 sec 1.07 GBytes 918 Mbits/sec receiver
iperf Done.
Looks a bit better, i dont know how bad the retries are though…
1 or 2 retries shouldn’t be a problem. There seem to be a couple of other bugs in the Ethernet driver that I’m working on. We’ll get to the bottom of it.
From those iperf stats your hardware looks healthy.
Cheers
Sam
2 Likes
Hi,
Sorry to unearth an old post but have been given an old Synology DS212 which I wanted to store films on. I have tried copying files to it and am getting approx 1.2mb/s speed.
I am using Virgin Hub 3.0, gigabit switch and cat 7 cables throughout so don’t understand the poor speeds…Any ideas? Ta
Can you run an iperf test?
