netdev - Re: [PATCH net] ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl

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Message-ID: <CAA2RiuQr=OaaSk=1AVKQFjWzrHO-8+qU1TN3_C05U5FyE13k6Q@mail.gmail.com>
Date: Sat, 31 Jan 2026 08:53:31 +0900
From: Hirokazu MORIKAWA <morikw2@...il.com>
To: edumazet@...gle.com
Cc: davem@...emloft.net, eric.dumazet@...il.com, horms@...nel.org, 
	kuba@...nel.org, Hirokazu MORIKAWA <morikw2@...il.com>, netdev@...r.kernel.org, 
	pabeni@...hat.com, syzbot+d4dda070f833dc5dc89a@...kaller.appspotmail.com
Subject: Re: [PATCH net] ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv()

> Can you provide detailed instructions ?

It is configured as a router.
OpenWrt isssue link: https://github.com/openwrt/openwrt/issues/21737

> I have no idea what MAP-E or DS-Lite are.
MAP-E (RFC 7597) and DS-Lite (RFC 6333) are IPv6 transition
technologies used to tunnel IPv4 traffic over IPv6-only networks. They
are widely deployed by ISPs, particularly in Japan, to handle the
shortage of IPv4 addresses.

I have packet captures from 6.12.67 (Broken) and 6.12.66 (Working).
The ICMP request-reply appears normal.
However, the ping command does not return a reply.