[FS#3909] Xiaomi mir3g: doesn't work PPPoE with 21.02

OpenWrt Bugs openwrt-bugs at lists.openwrt.org
Tue Jul 13 13:04:16 PDT 2021


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FS#3909 - Xiaomi mir3g: doesn't work PPPoE with 21.02
User who did this - darkblaze69 (darkblaze69)

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Well, I found out that openwrt 21.03 cannot autonegotiate with my provider's cable for pppoe. It shows 'no link', speed unknown etc.
# ethtool wan
Settings for wan:
	Supported ports: [ TP MII ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Supported pause frame use: Symmetric Receive-only
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Advertised pause frame use: Symmetric Receive-only
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: Unknown!
	Duplex: Unknown! (255)
	Port: MII
	PHYAD: 1
	Transceiver: external
	Auto-negotiation: on
	Supports Wake-on: d
	Wake-on: d
	Link detected: no


When I switch off autonegotiation and forced to 100baseT/Full, pppoe worked like a charm.
So as a workaround I added to /etc/rc.local:
/usr/sbin/ethtool -s wan speed 100 duplex full autoneg off
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3909#comment9917

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