Hi,
So I'm experimenting with this feature, I have a simple config:
#ovn-nbctl acl-list ls_vcn1_net1
from-lport 14000 (inport == "00bff7c0-2e2d-41ba-9485-3b5fa9801365" &&
(icmp4.type == 8 || icmp4.type == 0)) allow-related
from-lport 0 (inport == "00bff7c0-2e2d-41ba-9485-3b5fa9801365") drop
to-lport 14000 (outport == "00bff7c0-2e2d-41ba-9485-3b5fa9801365" &&
(icmp4.type == 8 || icmp4.type == 0)) allow-related
to-lport 0 (outport == "00bff7c0-2e2d-41ba-9485-3b5fa9801365") drop
I have sampling enabled on the ICMP:
collector1=$(ovn-nbctl create Sample_Collector id=1 name=c1
probability=65535 set_id=100)
ovn-nbctl create Sampling_App type="acl-new" id="42"
ovn-nbctl create Sampling_App type="acl-est" id="43"
ovn-nbctl create Sampling_App type="drop" id="44"
ovn-nbctl \
-- --id=@sample_in_1c_new create Sample collector="$collector1"
metadata=1001 \
-- --id=@sample_in_1c_est create Sample collector="$collector1"
metadata=1002 \
-- --sample-new=@sample_in_1c_new --sample-est=@sample_in_1c_est \
acl-add ls_vcn1_net1 from-lport 14000 "inport ==
\"00bff7c0-2e2d-41ba-9485-3b5fa9801365\" && (icmp4.type == 8 ||
icmp4.type == 0)" allow-related
ovn-nbctl acl-add ls_vcn1_net1 from-lport 0 "inport ==
\"00bff7c0-2e2d-41ba-9485-3b5fa9801365\"" drop
ovn-nbctl \
-- --id=@sample_in_1c_new create Sample collector="$collector1"
metadata=1003 \
-- --id=@sample_in_1c_est create Sample collector="$collector1"
metadata=1004 \
-- --sample-new=@sample_in_1c_new --sample-est=@sample_in_1c_est \
acl-add ls_vcn1_net1 to-lport 14000 "outport ==
\"00bff7c0-2e2d-41ba-9485-3b5fa9801365\" && (icmp4.type == 8 ||
icmp4.type == 0)" allow-related
ovn-nbctl acl-add ls_vcn1_net1 to-lport 0 "outport ==
\"00bff7c0-2e2d-41ba-9485-3b5fa9801365\"" drop
I generate some traffic:
# ping -c 10 192.16.1.6
PING 192.16.1.6 (192.16.1.6) 56(84) bytes of data.
64 bytes from 192.16.1.6: icmp_seq=1 ttl=64 time=3.13 ms
64 bytes from 192.16.1.6: icmp_seq=2 ttl=64 time=1.59 ms
64 bytes from 192.16.1.6: icmp_seq=3 ttl=64 time=0.982 ms
64 bytes from 192.16.1.6: icmp_seq=4 ttl=64 time=1.27 ms
64 bytes from 192.16.1.6: icmp_seq=5 ttl=64 time=1.08 ms
64 bytes from 192.16.1.6: icmp_seq=6 ttl=64 time=1.00 ms
64 bytes from 192.16.1.6: icmp_seq=7 ttl=64 time=0.990 ms
64 bytes from 192.16.1.6: icmp_seq=8 ttl=64 time=1.37 ms
64 bytes from 192.16.1.6: icmp_seq=9 ttl=64 time=1.03 ms
--- 192.16.1.6 ping statistics ---
10 packets transmitted, 9 received, 10% packet loss, time 9012ms
rtt min/avg/max/mdev = 0.982/1.386/3.131/0.649 ms
So I expect a total of 9 pkts and 576 bytes.
But looking at the samples generated seems like OVN/OVS is reporting
Total packets received = *543, *Total bytes received = *44,340* bytes!!!
Here is the dump of the generated samples:
# for f in $(ls -1 nfcapd.*); do nfdump -o json -r $f; done
[
{
"cnt" : 1,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 2,
"first" : "1969-12-31T19:04:22.000",
"last" : "1969-12-31T19:04:22.000",
"received" : "2025-10-22T10:49:26.738",
"in_packets" : 38,
"in_bytes" : 3172,
"proto" : 1,
"icmp_type" : 8,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.5",
"dst4_addr" : "192.16.1.6",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 33,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:e6:4f:46",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:be:06:16",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 704643079,
"observationPointID" : 1001,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 2,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 3,
"first" : "1969-12-31T19:04:20.000",
"last" : "1969-12-31T19:04:20.000",
"received" : "2025-10-22T10:49:26.740",
"in_packets" : 39,
"in_bytes" : 3256,
"proto" : 1,
"icmp_type" : 0,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.6",
"dst4_addr" : "192.16.1.5",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 23,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:be:06:16",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:e6:4f:46",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 721420295,
"observationPointID" : 1002,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 3,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 3,
"first" : "1969-12-31T19:04:21.000",
"last" : "1969-12-31T19:04:21.000",
"received" : "2025-10-22T10:49:27.740",
"in_packets" : 40,
"in_bytes" : 3340,
"proto" : 1,
"icmp_type" : 8,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.5",
"dst4_addr" : "192.16.1.6",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 33,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:e6:4f:46",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:be:06:16",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 721420295,
"observationPointID" : 1002,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 4,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 3,
"first" : "1969-12-31T19:04:20.000",
"last" : "1969-12-31T19:04:20.000",
"received" : "2025-10-22T10:49:27.740",
"in_packets" : 41,
"in_bytes" : 3424,
"proto" : 1,
"icmp_type" : 0,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.6",
"dst4_addr" : "192.16.1.5",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 23,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:be:06:16",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:e6:4f:46",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 721420295,
"observationPointID" : 1002,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 5,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 3,
"first" : "1969-12-31T19:04:19.000",
"last" : "1969-12-31T19:04:19.000",
"received" : "2025-10-22T10:49:28.741",
"in_packets" : 42,
"in_bytes" : 3508,
"proto" : 1,
"icmp_type" : 8,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.5",
"dst4_addr" : "192.16.1.6",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 33,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:e6:4f:46",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:be:06:16",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 721420295,
"observationPointID" : 1002,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 6,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 3,
"first" : "1969-12-31T19:04:19.000",
"last" : "1969-12-31T19:04:19.000",
"received" : "2025-10-22T10:49:28.741",
"in_packets" : 43,
"in_bytes" : 3592,
"proto" : 1,
"icmp_type" : 0,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.6",
"dst4_addr" : "192.16.1.5",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 23,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:be:06:16",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:e6:4f:46",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 721420295,
"observationPointID" : 1002,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 7,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 3,
"first" : "1969-12-31T19:04:18.000",
"last" : "1969-12-31T19:04:18.000",
"received" : "2025-10-22T10:49:29.742",
"in_packets" : 44,
"in_bytes" : 3676,
"proto" : 1,
"icmp_type" : 8,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.5",
"dst4_addr" : "192.16.1.6",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 33,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:e6:4f:46",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:be:06:16",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 721420295,
"observationPointID" : 1002,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 8,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 3,
"first" : "1969-12-31T19:04:17.000",
"last" : "1969-12-31T19:04:17.000",
"received" : "2025-10-22T10:49:29.742",
"in_packets" : 45,
"in_bytes" : 3760,
"proto" : 1,
"icmp_type" : 0,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.6",
"dst4_addr" : "192.16.1.5",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 23,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:be:06:16",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:e6:4f:46",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 721420295,
"observationPointID" : 1002,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 9,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 3,
"first" : "1969-12-31T19:04:17.000",
"last" : "1969-12-31T19:04:17.000",
"received" : "2025-10-22T10:49:30.744",
"in_packets" : 46,
"in_bytes" : 3844,
"proto" : 1,
"icmp_type" : 8,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.5",
"dst4_addr" : "192.16.1.6",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 33,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:e6:4f:46",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:be:06:16",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 721420295,
"observationPointID" : 1002,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 10,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 3,
"first" : "1969-12-31T19:04:16.000",
"last" : "1969-12-31T19:04:16.000",
"received" : "2025-10-22T10:49:30.744",
"in_packets" : 47,
"in_bytes" : 3928,
"proto" : 1,
"icmp_type" : 0,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.6",
"dst4_addr" : "192.16.1.5",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 23,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:be:06:16",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:e6:4f:46",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 721420295,
"observationPointID" : 1002,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 11,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 3,
"first" : "1969-12-31T19:04:16.000",
"last" : "1969-12-31T19:04:16.000",
"received" : "2025-10-22T10:49:31.745",
"in_packets" : 48,
"in_bytes" : 4012,
"proto" : 1,
"icmp_type" : 8,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.5",
"dst4_addr" : "192.16.1.6",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 33,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:e6:4f:46",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:be:06:16",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 721420295,
"observationPointID" : 1002,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 12,
"type" : "FLOW",
"ident" : "253-255-2-5",
"export_sysid" : 3,
"first" : "1969-12-31T19:04:15.000",
"last" : "1969-12-31T19:04:15.000",
"received" : "2025-10-22T10:49:31.745",
"in_packets" : 49,
"in_bytes" : 4096,
"proto" : 1,
"icmp_type" : 0,
"icmp_code" : 0,
"src_tos" : 0,
"src4_addr" : "192.16.1.6",
"dst4_addr" : "192.16.1.5",
"src4_geo" : "",
"dst4_geo" : "",
"input_snmp" : 23,
"output_snmp" : 0,
"src_mask" : 0,
"dst_mask" : 0,
"src_net" : "",
"dst_net" : "",
"direction" : 0,
"dst_tos" : 0,
"ip4_router" : "253.255.2.5",
"in_src_mac" : "52:54:00:be:06:16",
"out_dst_mac" : "00:00:00:00:00:00",
"in_dst_mac" : "52:54:00:e6:4f:46",
"out_src_mac" : "00:00:00:00:00:00",
"observationDomainID" : 721420295,
"observationPointID" : 1002,
"vlanID" : 0,
"post_vlanID" : 0,
"cust_vlanID" : 0,
"post_cust_vlanID" : 0,
"phys_ingress" : 0,
"phys_egress" : 0,
"ethertype" : 0,
"ip_version" : 4,
"ip_minttl" : 64,
"ip_maxttl" : 0,
"sampled" : 0
},
{
"cnt" : 13,
"type" : "FLOW",
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]
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