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Forum Discussion
Readynas interrupting internet connection on VDSL
Dear Community,
recently we moved houses and are now using VDSL for our internet connection. Previously we had Cable and before that I was working with the same Readynas on Glassfibre internet as well.
Now with VDSL we have a AVM 7530 Fritzbox and I am seeing some strange interactions.
The moment I connect the Readynas to the modem, the internet connection goes down. I can see in the Fritzbox error log that the connection is interupted. The DSL connection is still intact, but I get a PPPoE fault. 30 seconds later the connection is briefly established, after which is is just as quickly interupted again.
The moment I disconnect the Readynas, the connection is fine again. In the modem I have now limited the internetaccess of the Readynas and this as well leaves the internet connection intact even while the Readynas is still physically connected.
It seems there is some external communication responsible for this behaviour. At this moment I can still access the NAS internally on the LAN, but the device itself no longer has access to the WAN (or the other way around).
Does anyone know what could be causing this and how to resolve this?
16 Replies
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StephenB wrote:
NemoNL wrote:Does anyone know what could be causing this and how to resolve this?
If the ReadyNAS MTU is set to 1500, try lowering it to 1492.
That seemed to have helped a lot, thanks StephenB!. The connection is more stable, but still is disconnected every so often. I'm seeing a few series of disconnections last night and some now this morning. But at least it is coming back by itself.
Major improvement, but still something is not 100% ok. But at least this would be workable.
NemoNL wrote:
StephenB wrote:
NemoNL wrote:
Does anyone know what could be causing this and how to resolve this?
If the ReadyNAS MTU is set to 1500, try lowering it to 1492.
That seemed to have helped a lot, thanks StephenB!. The connection is more stable, but still is disconnected every so often. I'm seeing a few series of disconnections last night and some now this morning. But at least it is coming back by itself.
Major improvement, but still something is not 100% ok. But at least this would be workable.
1492 is the usual value for PPPoE, but it might need to be a bit lower still.
You can determine the value using ping - in a Windows PC you run CMD (command prompt) and then enter
ping -l 1464 -f 8.8.8.8
If you see a message that says
Packet needs to be fragmented but DF set.
then lower the 1464 value until you find the largest value that doesn't give that error. Then add 28 to the final value, and set the MTU to that size.
Another possibility is that something else on your network might be using the default 1500. It is possible to set the MTU on PCs (both MacOS and Windows). But unfortunately I don't think you can manually set the MTU for Android (without rooting the phone) or iOS. The MTU can be signaled via DHCP, so if your devices are using DHCP it might not need to be manually set.
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