[SOLVED] NO LAN (wired ethernet) IPv6 (but with WiFi all is ok)

[erdoukki]

on the ubuntu side, I do a tcpdump :

19:18:02.450812 Out 8c:04:ba:04:1e:ef ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) :: > ff02::1:ff22:816f: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fe80::ccea:c5f2:3622:816f
	  unknown option (14), length 8 (1): 
	  0x0000:  a05e 3375 a561
19:18:03.802466 Out 8c:04:ba:04:1e:ef ethertype IPv6 (0x86dd), length 64: (flowlabel 0xb9271, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::ccea:c5f2:3622:816f > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
19:18:07.802914 Out 8c:04:ba:04:1e:ef ethertype IPv6 (0x86dd), length 64: (flowlabel 0xb9271, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::ccea:c5f2:3622:816f > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
19:18:11.802992 Out 8c:04:ba:04:1e:ef ethertype IPv6 (0x86dd), length 64: (flowlabel 0xb9271, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::ccea:c5f2:3622:816f > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
19:18:40.977475   P f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 64: (flowlabel 0xba72e, hlim 255, next-header ICMPv6 (58) payload length: 8) fdcf:3be:f9e0::1 > 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f: [icmp6 sum ok] ICMP6, echo request, seq 0
19:18:45.990628   P f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::f2ad:4eff:fe08:aa5f > 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f
	  source link-address option (1), length 8 (1): f0:ad:4e:08:aa:5f
19:18:47.030634   P f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::f2ad:4eff:fe08:aa5f > 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f
	  source link-address option (1), length 8 (1): f0:ad:4e:08:aa:5f
19:18:48.080660   P f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::f2ad:4eff:fe08:aa5f > 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f
	  source link-address option (1), length 8 (1): f0:ad:4e:08:aa:5f

then nothing more

[erdoukki]

still on ubuntu, wifi activation tcpdump :

19:25:08.662953 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) :: > ff02::1:ff63:4bb6: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fe80::21e4:be5:f263:4bb6
	  unknown option (14), length 8 (1): 
	  0x0000:  f5e7 a551 7ff7
19:25:09.802724 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 64: (flowlabel 0x07299, hlim 255, next-header ICMPv6 (58) payload length: 8) fe80::21e4:be5:f263:4bb6 > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 8
19:25:09.834629   M f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 160: (flowlabel 0x3494e, hlim 255, next-header ICMPv6 (58) payload length: 104) fe80::f2ad:4eff:fe08:aa5f > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 104
	hop limit 64, Flags [none], pref medium, router lifetime 1800s, reachable time 0ms, retrans timer 0ms
	  prefix info option (3), length 32 (4): 2a01:e34:ec81:a4c0::/64, Flags [onlink, auto], valid time 86400s, pref. time 86400s
	  rdnss option (25), length 40 (5):  lifetime 600s, addr: fdf9:42b:7194:10::1 addr: fdf9:42b:7194:10::1
	  mtu option (5), length 8 (1):  1480
	  source link-address option (1), length 8 (1): f0:ad:4e:08:aa:5f
19:25:09.990915 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) :: > ff02::1:ffc1:b59f: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f
	  unknown option (14), length 8 (1): 
	  0x0000:  b6c7 0fce ab02
19:25:10.138917 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) :: > ff02::1:ffa7:f02b: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2a01:e34:ec81:a4c0:bdfb:7202:64a7:f02b
	  unknown option (14), length 8 (1): 
	  0x0000:  8cad 8401 921d
19:25:14.545167   M f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) fdcf:3be:f9e0::1 > ff02::1:ffc1:b59f: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f
	  source link-address option (1), length 8 (1): f0:ad:4e:08:aa:5f
19:25:14.545250 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f > fdcf:3be:f9e0::1: [icmp6 sum ok] ICMP6, neighbor advertisement, length 32, tgt is 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f, Flags [solicited, override]
	  destination link-address option (2), length 8 (1): d0:ab:d5:51:82:18
19:25:19.766874 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::21e4:be5:f263:4bb6 > fdcf:3be:f9e0::1: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fdcf:3be:f9e0::1
	  source link-address option (1), length 8 (1): d0:ab:d5:51:82:18
19:25:19.772091  In f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 80: (hlim 255, next-header ICMPv6 (58) payload length: 24) fdcf:3be:f9e0::1 > fe80::21e4:be5:f263:4bb6: [icmp6 sum ok] ICMP6, neighbor advertisement, length 24, tgt is fdcf:3be:f9e0::1, Flags [router, solicited]
19:25:24.882025  In f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::f2ad:4eff:fe08:aa5f > fe80::21e4:be5:f263:4bb6: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fe80::21e4:be5:f263:4bb6
	  source link-address option (1), length 8 (1): f0:ad:4e:08:aa:5f
19:25:24.882129 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 80: (hlim 255, next-header ICMPv6 (58) payload length: 24) fe80::21e4:be5:f263:4bb6 > fe80::f2ad:4eff:fe08:aa5f: [icmp6 sum ok] ICMP6, neighbor advertisement, length 24, tgt is fe80::21e4:be5:f263:4bb6, Flags [solicited]

and get ipv6 and traffic...

19:26:00.825984 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 80: (hlim 255, next-header ICMPv6 (58) payload length: 24) 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f > fe80::f2ad:4eff:fe08:aa5f: [icmp6 sum ok] ICMP6, neighbor advertisement, length 24, tgt is 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f, Flags [solicited]
19:26:00.826051  In f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 64: (flowlabel 0xba72e, hlim 255, next-header ICMPv6 (58) payload length: 8) fdcf:3be:f9e0::1 > 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f: [icmp6 sum ok] ICMP6, echo request, seq 0
19:26:00.826081 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 64: (flowlabel 0x61794, hlim 64, next-header ICMPv6 (58) payload length: 8) 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f > fdcf:3be:f9e0::1: [icmp6 sum ok] ICMP6, echo reply, seq 0
19:26:01.850807  In f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 64: (flowlabel 0xba72e, hlim 255, next-header ICMPv6 (58) payload length: 8) fdcf:3be:f9e0::1 > 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f: [icmp6 sum ok] ICMP6, echo request, seq 0
19:26:01.850856 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 64: (flowlabel 0x61794, hlim 64, next-header ICMPv6 (58) payload length: 8) 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f > fdcf:3be:f9e0::1: [icmp6 sum ok] ICMP6, echo reply, seq 0
19:26:02.875185  In f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 64: (flowlabel 0xba72e, hlim 255, next-header ICMPv6 (58) payload length: 8) fdcf:3be:f9e0::1 > 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f: [icmp6 sum ok] ICMP6, echo request, seq 0
19:26:02.875208 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 64: (flowlabel 0x61794, hlim 64, next-header ICMPv6 (58) payload length: 8) 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f > fdcf:3be:f9e0::1: [icmp6 sum ok] ICMP6, echo reply, seq 0
19:26:05.928902  In f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 64: (flowlabel 0xba72e, hlim 255, next-header ICMPv6 (58) payload length: 8) fdcf:3be:f9e0::1 > 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f: [icmp6 sum ok] ICMP6, echo request, seq 0
19:26:05.928955 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 64: (flowlabel 0x61794, hlim 64, next-header ICMPv6 (58) payload length: 8) 2a01:e34:ec81:a4c0:881e:f985:51c1:b59f > fdcf:3be:f9e0::1: [icmp6 sum ok] ICMP6, echo reply, seq 0
19:26:10.966903 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::21e4:be5:f263:4bb6 > fe80::f2ad:4eff:fe08:aa5f: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fe80::f2ad:4eff:fe08:aa5f
	  source link-address option (1), length 8 (1): d0:ab:d5:51:82:18
19:26:10.972658  In f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 80: (hlim 255, next-header ICMPv6 (58) payload length: 24) fe80::f2ad:4eff:fe08:aa5f > fe80::21e4:be5:f263:4bb6: [icmp6 sum ok] ICMP6, neighbor advertisement, length 24, tgt is fe80::f2ad:4eff:fe08:aa5f, Flags [router, solicited]
19:26:16.186037  In f0:ad:4e:08:aa:5f ethertype IPv6 (0x86dd), length 88: (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::f2ad:4eff:fe08:aa5f > fe80::21e4:be5:f263:4bb6: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fe80::21e4:be5:f263:4bb6
	  source link-address option (1), length 8 (1): f0:ad:4e:08:aa:5f
19:26:16.186082 Out d0:ab:d5:51:82:18 ethertype IPv6 (0x86dd), length 80: (hlim 255, next-header ICMPv6 (58) payload length: 24) fe80::21e4:be5:f263:4bb6 > fe80::f2ad:4eff:fe08:aa5f: [icmp6 sum ok] ICMP6, neighbor advertisement, length 24, tgt is fe80::21e4:be5:f263:4bb6, Flags [solicited]

[erdoukki]

SOLVED !!!
IT IS MY SWITCH !!!

[solved] Router cannot ping some local IPV6 addresses

When I ping a known local IPV6 address from the router, it sometimes fails. However, when I ping the same address from a different machine on my network, it is available. There's hints that it's not consistent over time, but I'll have to monitor again in the morning to prove that. I'm running OpenWRT 19.07.02 on a TP-Link Archer C2600. What diagnostics should I run to isolate this issue? Are there any logs that I should review? I did go through the system log from luci, however spotted nothing…

My switch is a NETGEAR PROSAFE GS105E, which look to filter something and break IPv6 !!!

When my Ubuntu is directly linked to the BR-LAN port of the espressobin; I get IPV6....
THANKS ALL and mainly @trendy !

NETGEAR GS108PE-300EUS and IPv6

[trendy]

It seemed weird not to get anything at all, while the host sends them.
As it happened to the other post, it is important to explain the full topology, so we can troubleshoot devices in the middle like this switch.