Modem random drop-outs
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Modem random drop-outs
yesterday - last edited yesterday
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Connection: FTTC VDSL 2
Router: Asus RT-AX58U with OpenWRT - standard set up, nothing special.
Modem: Huawei HG612 with latest Kitz forum reflashed firmware
Discussion: System, which is recent install, works fine most of the time, I'm getting full throughput compared to my old FritzBox, which worked for years but showed signs of giving up, hence the new hardware. DSLStats reports no problems. This problem manifested itself from the beginning of the new hardware's installation.
Problem: Randomly, the link between modem and router seems to fail, for just ten seconds or so while the router re-authenticates. It looks like a problem with the line card as authentication takes a fairly short time, while retraining takes much longer - and it's not doing that.
Fixes tried - all made no difference:
- New router
- Replacing the Ethernet cable
- Re-orienting the modem to allow for better heat dissipation
Suggestions welcome, please!
Re: Modem random drop-outs
yesterday
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In the absence of helpful router stats, given that you have seen similar with different kit - consider REIN n SHINE. See Kitz.
In another browser tab, login into the Plusnet user portal BEFORE clicking the fault & ticket links
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If this post helped, please click the Thumbs Up and if it fixed your issue, please click the This fixed my problem green button below.
Re: Modem random drop-outs
yesterday
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Randomly, the link between modem and router seems to fail, for just ten seconds or so while the router re-authenticates. It looks like a problem with the line card as authentication takes a fairly short time, while retraining takes much longer - and it's not doing that.
Are you absolutely sure the modem isnt retraining ?
If you are, then check the openwrt kernel log for the WAN ethernet port (eth<n>) status. You may see something like
[9086704.622979] mtk_soc_eth 1e100000.ethernet eth0: Link is Down
[9086717.102934] mtk_soc_eth 1e100000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
I had a similar problem with a Mediatek chipset based router. It would occasionally 'glitch' and drop the eth port and then immediately recover. Problem was it would cause the pppoe to drop. I fixed it by setting 'force link' on the advanced settings for the WAN interface. In that way it won't drop PPPoE due to a short 'carrier' ( the eth<n interface ) drop but if connection is lost for any length of time then PPPoE will time out due to LCP echo not received.
For info, I have LCP echo threshold set to 6 and LCP echo interval set to 5, so a 30 sec timeout in total
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
Re: Modem random drop-outs
yesterday
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Thanks for the feedback. Here are the DSL stats (no errors):
Stats recorded 04 Dec 2024 17:25:50
DSLAM/MSAN type: IFTN:0xb206 / v0xb206
Modem/router firmware: AnnexA version - A2pv6C038m.d24j
DSL mode: VDSL2
Status: Showtime
Uptime: 4 hours 49 min 59 sec
Resyncs: 0 (since 04 Dec 2024 12:09:17)
Downstream Upstream
Line attenuation (dB): 13.1 0.0
Signal attenuation (dB): Not monitored
Connection speed (kbps): 71131 19996
SNR margin (dB): 6.3 6.0
Power (dBm): 2.1 2.0
Interleave depth: 1 1
INP:
RSCorr/RS (%): 0.0000 N/A
RSUnCorr/RS (%): 0.0000 N/A
ES/hour: 0 0
Re: Modem random drop-outs
yesterday
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The modem's DSL light stays on and it takes just 10 seconds for the WAN connection to return. Also, there's no sign in the modem's logs of the DSL line going down - or in fact of any event at all. It is noticed only by the router, which returns this error message as the line goes down:
RT-AX58U-A5F2726-C kernel: eth0 (Int switch port: 0) (Logical Port: 0) (phyId: Link DOWN.
I've tried increasing the retries (PPP Echo Max Failures) but it seems to make little difference. PPP Echo is set to 10.
How would I set 'force link'?
Re: Modem random drop-outs
yesterday
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How would I set 'force link'?
It's a check box on the Advanced settings tab for the Wan interface. The same page as the LCP echo settings
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Re: Modem random drop-outs
yesterday
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@mdubash using Luci goto Network->Interfaces, select Edit for the WAN interface, then select the Advanced settings tab. It should look something like this
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Re: Modem random drop-outs
yesterday - last edited yesterday
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Thanks - I must be going blind because I can see no such option on the WAN settings page. There's no 'Advanced' tab, nor a 'force link' option.
Edit: PS: Just discovered Luci - will investigate. Years of using the simple FritzBox interface have left me out of this loop
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