We’re using an L009 in a home environment. All works really well except for a sky mini box (everything is connected via wired ethernet btw, no WiFi)
The issue is an extremely bad lag when pausing or switching channels on the sky mini box. The main box is a couple of rooms away. The fix is brutal but it works. Removing the L009 and fitting the original Virgin 5x router removes the issue which shows me that the issue is something to do with the L009. I’ve tried multiple fixes, connecting via wifi, changing cables, changing switches etc but the only fix is to remove the L009. The L009 blows the Virgin 5x out of the water in terms of features so I really want it back in circuit.
Just looking to gather up suggestions on what to try from the community guys.
I’m under the impression that you live in the UK going by mention of Sky and Virgin as ISPs.
Can you export your config and attach to the post please? Remember to remove serial numbers and sensitive info.
Would you also be able to expand upon what you mean by lag? Are you talking about the picture breaking up or are you talking about the stream becoming behind “real time”?
config below. Nothing complicated, a few minor changes from the default, that’s all.
When I say lag I mean when I (for instance) pause then the it takes around 30 secs for the screen to actually pause. When I swap out the Mikrotik the issue disappears.
just looking for advice on where to look for a fix. Its sending me nuts.
Thanks for posting the config and explaining the lag issue further.
I’ve studied your config and the only thing that I’ve noticed is that it lacks a rule to clamp MSS. If there is a packet that is sent via WAN and larger than expected for the destination then some servers outright reject it. This causes some websites to completely fail (e.g: https://nationwide.co.uk I noticed recently).
In both IPv4 and IPv6 firewall set the fasttrack rule to disabled for testing and then add these rules in:
Thanks Sc0tty - the sky Q box and the Sky Mini are both on the LAN however the firewall must be getting involved as replacing it makes the issue vanish.
I’ll give this a go in the next few days and report back here.
(I’d have never have spotted an issue like this btw so thanks for that)
Updated ip firewall mangle for both ipv4 and ipv6. Fasttrack also disabled.
refitted the Mikrotik to a network that works as expected. Initially all seemed well however with 5 mins or so the sky mini started showing the lag issue again. pausing the picture takes around 20 seconds to register, same for un-pausing. Changing channels has no effect for around 15 secs, then we see a black screen for another 10 secs then the channel changes.
The issue is bizarre but only manifests with the Mikrotik in circuit.
In all other respects the network behaves perfectly. When we re-install the Virgin 5x unit (don’t laugh) the issue vanishes again.
I promise I didn’t laugh about the Virgin 5x router.
Shame the MSS clamping didn’t work. It sorted a few strange things going wrong here.
I honestly can’t see anything wrong with your config that would be doing this kind of thing. Without taking a deep look into what’s going on (interface stats, Torch, packet capture, etc) I’m struggling to suggest anything further.
Yeah, I've not listed anywhere near everything I've tried. I posted when I ran out of ideas. Thanks for the MSS clamping suggestion (I’d have never tried that btw). I have an idea that the next move is to run up a Wireshark session and setting a monitor port on the switch that’s running the Sky Mini box.
I’ll get round to that and post again. Thing is everything’s working but I really want the sky box moved to a cupboard. Even fitted an SFP configured for Virgin’s fibre…