I am creating IP6 over IP6 GRE Tunnel in VPP & VM instance. I am able to see the outgoing tunneled ICMP6 from VPP to the VM instance as captured over the Wireshark. The other instance is able to reply that but the reply packets are not reaching and pingis failing.
>From the VM side if I ping the VPP gre IP address 5001:1::1, the ping is >failing. Please let me know what I am missing. Configuration as below VPP Instance [ Configuration ] vpp# show version vpp v20.09-release built by root on 38f81bec6dbd at 2020-10-01T02:57:46 vpp# set interface state GigabitEthernet0/8/0 up vpp# set interface ip address GigabitEthernet0/8/0 2001:100::1/64 vpp# ip route add 2005:100::1/64 via GigabitEthernet0/8/0 <IP Address 2005:100::1 is pingable > vpp# ping 2005:100::1 76 bytes from 2005:100::1: icmp_seq=1 ttl=64 time=.2364 ms 76 bytes from 2005:100::1: icmp_seq=2 ttl=64 time=.2273 ms 76 bytes from 2005:100::1: icmp_seq=3 ttl=64 time=.2159 ms 76 bytes from 2005:100::1: icmp_seq=4 ttl=64 time=.2678 ms 76 bytes from 2005:100::1: icmp_seq=5 ttl=64 time=.2027 ms Statistics: 5 sent, 5 received, 0% packet loss vpp# create gre tunnel src 2001:100::1 dst 2005:100::1 vpp# set interface ip address gre0 5001:1::1/64 vpp# ip route add 3005:1::/64 via gre0 vpp# set interface state gre0 up vpp# show int Name Idx State MTU (L3/IP4/IP6/MPLS) Counter Count GigabitEthernet0/8/0 1 up 9000/0/0/0 rx packets 13 rx bytes 1602 tx packets 15 tx bytes 1750 drops 3 punt 1 ip6 13 gre0 2 up 9000/0/0/0 local0 0 down 0/0/0/0 vpp# ping 3005:1::1 Statistics: 5 sent, 0 received, 100% packet loss vpp# show trace ------------------- Start of thread 0 vpp_main ------------------- Packet 1 00:16:46:761592: dpdk-input GigabitEthernet0/8/0 rx queue 0 buffer 0x9be79: current data 0, length 182, buffer-pool 0, ref-count 1, totlen-nifb 0, trace handle 0x0 ext-hdr-valid l4-cksum-computed l4-cksum-correct PKT MBUF: port 0, nb_segs 1, pkt_len 182 buf_len 2176, data_len 182, ol_flags 0x0, data_off 128, phys_addr 0x782f9ec0 packet_type 0x0 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 rss 0x0 fdir.hi 0x0 fdir.lo 0x0 IP6: 08:00:27:7d:b1:12 -> 08:00:27:34:a5:29 IP6_DESTINATION_OPTIONS: 2005:100::1 -> 2001:100::1 tos 0x00, flow label 0x90736, hop limit 64, payload length 128 00:16:46:761602: ethernet-input frame: flags 0x3, hw-if-index 1, sw-if-index 1 IP6: 08:00:27:7d:b1:12 -> 08:00:27:34:a5:29 00:16:46:761605: ip6-input IP6_DESTINATION_OPTIONS: 2005:100::1 -> 2001:100::1 tos 0x00, flow label 0x90736, hop limit 64, payload length 128 00:16:46:761606: ip6-lookup fib 0 dpo-idx 8 flow hash: 0x00000000 IP6_DESTINATION_OPTIONS: 2005:100::1 -> 2001:100::1 tos 0x00, flow label 0x90736, hop limit 64, payload length 128 00:16:46:761608: ip6-local IP6_DESTINATION_OPTIONS: 2005:100::1 -> 2001:100::1 tos 0x00, flow label 0x90736, hop limit 64, payload length 128 00:16:46:761609: ip6-punt IP6_DESTINATION_OPTIONS: 2005:100::1 -> 2001:100::1 tos 0x00, flow label 0x90736, hop limit 64, payload length 128 00:16:46:761610: error-punt rx:GigabitEthernet0/8/0 00:16:46:761611: punt ip6-input: valid ip6 packets Other VM Instance ----------------- ip link add deth0 type dummy ifconfig deth0 up ip -6 add addr 3005:1::1 dev deth0 ip -6 add addr 2005:100::1 dev eth0 ip link add name gre0 type ip6gre local 2005:100::1 remote 2001:100::1 dev eth0 ifconfig gre0 up ip -6 route add default dev gre0 ip -6 route add 2001:100::1/64 dev eth0
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