Hi,
It’s not clear [to me at least] why the packet in your trace was dropped. It
was an IPv6 packet to/from the tunnel src/dst, but it has IPv6 extension header
for ‘destination options’. VPP was not able to read past this header for
reasons I cannot say from that trace alone. I would suggest you capture a pcap
trace to get more info:
DBGvpp# pcap ?
pcap trace pcap trace [rx] [tx] [drop] [off]
[max <nn>] [intfc <interface>|any]
[file <name>] [status] [max-bytes-per-pkt <nnnn>][filter]
[preallocate-data][free-data]
/neale
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io>
Date: Thursday, 31 December 2020 at 14:46
To: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io>
Subject: [vpp-dev] GRE Tunnel IP6 over IP6
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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