Cannot access or ping zerotier network. Zerotier network is IPv6 only. Also got it approved on the ZT panel. IPv6 address is sent by zt. Also allowed global=yes is set. Lastly, no firewall rule is configured apart from fasttrack rules.

anyone has any clue?

...you should hide your network-ID

Sorry to ask, but you did try pingv6 for either side of the zt-tunnel?

Can you provide the output from /ip route print detail and /zerotier print detail?

Can you provide the output from /ip route print detail and /zerotier print detail?

/zerotier/interfaces/print
Flags: D - dynamic, X - disabled; R - running
0 R name="OpenSwitch-IX" mac-address=AA:FE:E3:BD:DF:7D arp-timeout=auto network="8bd5124fd675b6aa" instance=zt1 allow-global=yes bridge=no dhcp=no
network-name="OpenSwitch-IX" status="OK" type="PRIVATE"

1 R name="zerotier1" mac-address=3E:3D:82:9C:C2:D8 arp-timeout=auto disable-running-check=yes network="0cccb752f714753d" instance=zt1 allow-managed=yes
allow-global=yes bridge=no dhcp=no network-name="PyramIX" status="OK" type="PRIVATE"
[kalpak@edgerouter-ccu.kalpak.net.in] /zerotier>

/zerotier/print
Flags: X - disabled, R - online; F - tcp-fallback
0 R ;;; ZeroTier Central controller - https://my.zerotier.com/
name="zt1" disabled=no port=9993 identity="48966b906f:0:b1d2f495b4bb92074a167d148b464e41c6a1dd02d0038b8b011f127890845d6c3eec3d284590a3f596d035f24536
4e90865d8a39cef9d1e24d91b71ced8b3127:f17705b7fc67ba649466cf274ffce5b3b83ed0a23f00ec0e48b133e58c5a11abd3a014407b90ee23d2cc86f5fcf90a641ae9b7c0727a
4684e67a0cdc50cce007"
interfaces=all
identity.public="48966b906f:0:b1d2f495b4bb92074a167d148b464e41c6a1dd02d0038b8b011f127890845d6c3eec3d284590a3f596d035f245364e90865d8a39cef9d1e24d91b7
1ced8b3127"
state="running"

ipv6 route print

DAc 2a01:d0:7fff:12d::/64 netassist 0
DAc 2a01:20e111::/64 openfactory 0
DAc 2a0c:9a4045e::/64 ifog 0
DAc 2a0e:46c4:102::/64 zerotier1 0
0 As 2a0e:46c4:/44 1
1 As 2a0e:46c4:/46 1
2 As 2a0e:46c4:/47 1
3 As 2a0e:46c4:/47 1
4 As 2a0e:46c4:/46 1
5 As 2a0e:46c4:/47 1
6 As 2a0e:46c4:/47 1
7 As 2a0e:46c4:/46 1
8 As 2a0e:46c4:/47 1
9 As 2a0e:46c4:/47 1
10 As 2a0e:46c4:/46 1
11 As 2a0e:46c4:/47 1
12 As 2a0e:46c4:/47 1
13 As 2a0e:8f02:/44 1
14 As 2a0e:8f02:/46 1
15 As 2a0e:8f02:/47 1
16 As 2a0e:8f02:/47 1
17 As 2a0e:8f02:/46 1
18 As 2a0e:8f02:/47 1
19 As 2a0e:8f02:/47 1
20 As 2a0e:8f02:/46 1
21 As 2a0e:8f02:/47 1
22 As 2a0e:8f02:/47 1
23 As 2a0e:8f02:/46 1
24 As 2a0e:8f02:/47 1
25 As 2a0e:8f02:/47 1
26 As 2a0e:8f02:f01b::/48 1
DAc 2a0e:8f02:f01b:29::/64 LL-IX 0
DAc 2a0e:8f02:f01b:69::/64 Madhyamgram 0
DAc 2a0e:8f02:f01b:b00b::/64 loopback 0
DAc 2a0e:8f02:f01b:dead::/64 200-DC 0
DAc fe80::%ether2/64 ether2 0
DAc fe80::%ether3/64 ether3 0
DAc fe80::%ether6/64 ether6 0
DAc fe80::%100-LAN/64 100-LAN 0
DAc fe80::%200-DC/64 200-DC 0
DAc fe80::%loopback/64 loopback 0
DAc + fe80::%securebit/64 securebit 0
DAc + fe80::%securebit/64 securebit 0
DAc fe80::%DumDum/64 DumDum 0
DAc + fe80::%Madhyamgram/64 Madhyamgram 0
DAc + fe80::%Madhyamgram/64 Madhyamgram 0
DAc + fe80::%ifog/64 ifog 0
DAc + fe80::%ifog/64 ifog 0
DAc + fe80::%openfactory/64 openfactory 0
DAc + fe80::%openfactory/64 openfactory 0
DAc + fe80::%LL-IX/64 LL-IX 0
DAc + fe80::%LL-IX/64 LL-IX 0
DAc + fe80::%netassist/64 netassist 0
DAc + fe80::%netassist/64 netassist 0
DAc + fe80::%Uttarpara/64 Uttarpara 0
DAc + fe80::%Uttarpara/64 Uttarpara 0
DAc + fe80::%Kochi/64 Kochi 0
DAc + fe80::%Kochi/64 Kochi 0
DAc fe80::%zerotier1/64 zerotier1 0
DAc fe80::%300-WLAN/64 300-WLAN 0

Sorry to ask, but you did try pingv6 for either side of the zt-tunnel?

Yes still the same. No ping reply.