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FS#4090 - No configuration from ISP on Asus RT-AC85P #9069

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openwrt-bot opened this issue Oct 18, 2021 · 12 comments
Open

FS#4090 - No configuration from ISP on Asus RT-AC85P #9069

openwrt-bot opened this issue Oct 18, 2021 · 12 comments
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flyspray release/21.02

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@openwrt-bot
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@openwrt-bot openwrt-bot commented Oct 18, 2021

BUG-reporter:

Supply the following if possible:

  • Device problem occurs on Asus RT-AC85P
  • Software versions of OpenWrt/LEDE release, packages, etc.: 21.02
  • Steps to reproduce
    After installing latest released OpenWrt 21.02 to AC85P I found it is not able to get network configuration from ISP - WAN interface has no IP etc.
    Some additional info:
  • My old TL-WR1043ND with OpenWrt 19.07 works good with my ISP.
  • My desktop machine and all my several laptops works good with my ISP (connecting to is directly by cable).
  • RT-AC85P with stock firmware works good with my ISP; it is getting network config from ISP.

I made a call to my ISP support informing them my router not able to get network config on what they answered "my router doesn't sends its MAC address".

An appropriate forum thread: https://forum.openwrt.org/t/no-configuration-from-isp-on-asus-rt-ac85p/108056/12

@openwrt-bot
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@openwrt-bot openwrt-bot commented Oct 20, 2021

BUG-reporter:

And recently from suggestion from some guy on 4pda forum I found a workaround which works. After setting WAN to 100 mbit:
ethtool -s wan speed 100 duplex full autoneg on
it is immediately received config from ISP. It is definitely a bug!

@openwrt-bot
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@openwrt-bot openwrt-bot commented Oct 21, 2021

zvova7890:

I can confirm. Also if connect ISP cable to the lan - same situation. For some reason driver incorrectly detect connection speed for the ISP cable. With PC it correctly detected 100 and 1000 mbit. If connect ISP cable directly to PC(which have 1gbit eth) - all correct, have 100mbit link.

@openwrt-bot
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@openwrt-bot openwrt-bot commented Oct 24, 2021

BUG-reporter:

Well... no reactions. 8/

@openwrt-bot
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@openwrt-bot openwrt-bot commented Nov 8, 2021

BUG-reporter:

21.02.1 released but this bug is not fixed which is terrible. 8/

@aparcar aparcar added the release/21.02 label Feb 22, 2022
@cociweb
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@cociweb cociweb commented Mar 6, 2022

Hello,
let me summarize the topic from here: https://forum.openwrt.org/t/wan-link-flapping-with-asus-rt-ac85p/93712
It seems it's a race situation, or something like that. (different builds behaves with different success ratio, but the situation always the same:
during the link setup the mt7621? does not recognize the advertised 1000/full duplex link from the another device (maybe some synchronization or frame catch issue), and the autonegotiation (if enabled) degrades it to 10/100 otherwise the link is not set up. The ethtool also reports only 10/100 from the advertised link speeds, so it seems that the root cause is in the 7621 driver.
(Let me add that the stock firmware (with the same 7621 driver) also suffer from this glich, so not 21.02 specific)

@cociweb
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@cociweb cociweb commented Mar 6, 2022

Duplicate of:

  • #8982
  • #8981
  • #8980
  • #8979
  • #8930
    As you can see, many users have the same issue, I can confirm it's a bug not a phisical wire or port issue.

@BUG-reporter
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@BUG-reporter BUG-reporter commented Mar 12, 2022

Hello, cociweb

(Let me add that the stock firmware (with the same 7621 driver) also suffer from this glich, so not 21.02 specific)

This is not correct. There is no such issue on the stock firmware in my case.
It is definitely refers to AUTONEGOTIATION issue. But I am not sure is it driver related or something else. And yes, it is NOT RELATED on phisical wire or port.

@cociweb
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@cociweb cociweb commented Mar 15, 2022

Hello,
in this case, the linked issues has different root causes. my rt-ac85p definitelly has the same problem with the stock firmware witch is more than 1 year old firmware... (bug report is opened for the manufacturer also, but nobody re-reports it, so it has very low priority on the manufacturer side....)
As a workaround you can insert a third gigabit network element (eg an unmanaged switch) between your isp modem and your asus router. it will initialize correctly your firmware (autonegotiation feature / reading the neighbour advertising infos or anything else), once it is recognized, you can left it out from the chain. But if you restart your device, it will initialize (incorrectly) again so don't restart your openwrt/interface.

Additionally you can give a try for the following wan interface parameters. here are my latest sandbox values:
image

@BUG-reporter
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@BUG-reporter BUG-reporter commented Mar 17, 2022

Hello, in this case, the linked issues has different root causes. my rt-ac85p definitelly has the same problem with the stock firmware witch is more than 1 year old firmware... (bug report is opened for the manufacturer also, but nobody re-reports it, so it has very low priority on the manufacturer side....) As a workaround you can insert a third gigabit network element (eg an unmanaged switch) between your isp modem and your asus router. it will initialize correctly your firmware (autonegotiation feature / reading the neighbour advertising infos or anything else), once it is recognized, you can left it out from the chain. But if you restart your device, it will initialize (incorrectly) again so don't restart your openwrt/interface.

Additionally you can give a try for the following wan interface parameters. here are my latest sandbox values: image

Hello. I am sure and have checked several times: I have no issues with stock firmware but with openwrt only. And as a workaround I would better use ethtool instead of any additional hardware.

P.S. I will try your additional suggestion ASAP and reply. Thanks.

@cociweb
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@cociweb cociweb commented Mar 23, 2022

Hello @BUG-reporter,
Is the above mentioned trio made any positive adjustment?
Thank you for your feedback

@BUG-reporter
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@BUG-reporter BUG-reporter commented May 4, 2022

Hello, cociweb. Sorry I was not able to test your advice. But I recently checked OpenWrt 22.03.0-rc1 and it seems it is resolved. However 21.02.3 still not fixed.

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