Netflow Forward
These scenarios show how to configure and use Netflow to collect and export TCP forwarded flows. Different NAT topologies are described.
Netflow Without NAT
Description
Simple scenario without NAT configuration.
Scenario
Step 1: Set the following configuration in DUT0 :
set interfaces ethernet eth0 address 10.0.0.2/24 set interfaces ethernet eth0 flow egress selector TCP_SEL set interfaces ethernet eth0 flow ingress selector TCP_SEL set interfaces ethernet eth1 address 20.0.0.2/24 set system conntrack app-detect set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0' set system netflow app-id set system netflow destination 10.0.0.1 set system netflow engine-id 1111 set traffic selector TCP_SEL rule 1 protocol tcp
Step 2: Set the following configuration in DUT1 :
set interfaces ethernet eth0 address 10.0.0.1/24 set protocols static route 0.0.0.0/0 next-hop 10.0.0.2 set system conntrack app-detect set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Set the following configuration in DUT2 :
set interfaces ethernet eth0 address 20.0.0.1/24 set protocols static route 0.0.0.0/0 next-hop 20.0.0.2 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 4: Run command system conntrack clear at DUT1.
Step 5: Ping IP address 10.0.0.1 from DUT0:
admin@DUT0$ ping 10.0.0.1 count 1 size 56 timeout 1Show output
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data. 64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=2.59 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 2.592/2.592/2.592/0.000 ms
Step 6: Ping IP address 20.0.0.1 from DUT0:
admin@DUT0$ ping 20.0.0.1 count 1 size 56 timeout 1Show output
PING 20.0.0.1 (20.0.0.1) 56(84) bytes of data. 64 bytes from 20.0.0.1: icmp_seq=1 ttl=64 time=4.63 ms --- 20.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 4.628/4.628/4.628/0.000 ms
Step 7: Initiate a tcp connection from DUT1 to DUT2 and try to send some messages between both endpoints
admin@DUT2$ monitor test connection server 8080 tcp admin@DUT1$ monitor test connection client 20.0.0.1 8080 tcp
Step 8: Run command system netflow show flows detailed at DUT0 and check if output matches the following regular expressions:
2\s+3\s+10.0.0.1:\d+\s+20.0.0.1:\d+\s*\d*\s*\d+[^\[]*\[L4:8080\]Show output
------------------------------------------------------------------------------------------ Field Description ------------------------------------------------------------------------------------------ # Numeric flow identifier hash Hash of the flow a Shows if the flow is pending of being exported iif Input interface oif Output interface src Source IP:PORT dst Destination IP:PORT protocol Protocol identifier nexthop Next-hop [Layer 4:Port] tos Type of service identificator tcpflags TCP flags options Optional IP options tcpoptions TCP Options (MSS, Window Scaling, Selective Acknowledgements, Timestamps, Nop) pkts Packets counter bytes Bytes counter ts_first Timestamp of fist packet that passed through the flow ts_last Timestamp of last packet that passed through the flow ---------------------------------------------------------------------------------------------------------------------------------------------------- # hash a iif oif src dst protocol nexthop tos tcpflags options tcpoptions pkts bytes ts_first ts_last ---------------------------------------------------------------------------------------------------------------------------------------------------- 1 7265 0 3 2 20.0.0.1:8080 10.0.0.1:35330 35330 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 451 49 2 a4f8 0 2 3 10.0.0.1:35330 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 451 49
Step 9: Run command system netflow show flows detailed at DUT0 and check if output matches the following regular expressions:
3\s+2\s+20.0.0.1:\d+\s+10.0.0.1:\d+\s*\d*\s*\d+[^\[]*\[L4:8080\]Show output
------------------------------------------------------------------------------------------ Field Description ------------------------------------------------------------------------------------------ # Numeric flow identifier hash Hash of the flow a Shows if the flow is pending of being exported iif Input interface oif Output interface src Source IP:PORT dst Destination IP:PORT protocol Protocol identifier nexthop Next-hop [Layer 4:Port] tos Type of service identificator tcpflags TCP flags options Optional IP options tcpoptions TCP Options (MSS, Window Scaling, Selective Acknowledgements, Timestamps, Nop) pkts Packets counter bytes Bytes counter ts_first Timestamp of fist packet that passed through the flow ts_last Timestamp of last packet that passed through the flow ---------------------------------------------------------------------------------------------------------------------------------------------------- # hash a iif oif src dst protocol nexthop tos tcpflags options tcpoptions pkts bytes ts_first ts_last ---------------------------------------------------------------------------------------------------------------------------------------------------- 1 7265 0 3 2 20.0.0.1:8080 10.0.0.1:35330 35330 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 488 86 2 a4f8 0 2 3 10.0.0.1:35330 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 488 86
Step 10: Run command system netflow show status at DUT0 and check if output matches the following regular expressions:
Protocol\sversion\s10\s\(ipfix\) Export:.*Errors 0 pkts sock0:\s127.0.0.1:2055,.*err: sndbuf reached 0, connect 0, cberr 0, other 0Show output
ipt_NETFLOW 2.6, srcversion 418B6B427893697590BEEA5; dir Protocol version 10 (ipfix), refresh-rate 20, timeout-rate 30, (templates 0, active 1). Timeouts: active 1800s, inactive 15s. Maxflows 2000000 Flows: active 2 (peak 2 reached 0d0h0m ago), mem 492K, worker delay 25/250 [1..25] (16 ms, 0 us, 2:0 [cpu1]). Hash: size 62967 (mem 491K), metric 1.00 [1.00, 1.00, 1.00]. InHash: 27 pkt, 1 K, InPDU 0, 0. Rate: 344 bits/sec, 0 packets/sec; Avg 1 min: 43 bps, 0 pps; 5 min: 8 bps, 0 pps cpu# pps; <search found new [metric], trunc frag alloc maxflows>, traffic: <pkt, bytes>, drop: <pkt, bytes> Total 0; 0 39 2 [1.00], 0 0 0 0, traffic: 27, 0 MB, drop: 0, 0 K cpu0 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K cpu1 0; 0 39 2 [1.00], 0 0 0 0, traffic: 27, 0 MB, drop: 0, 0 K cpu2 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K cpu3 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K Export: Rate 0 bytes/s; Total 2 pkts, 0 MB, 0 flows; Errors 0 pkts; Traffic lost 0 pkts, 0 Kbytes, 0 flows. sock0: 127.0.0.1:2055, sndbuf 212992, filled 1, peak 1; err: sndbuf reached 0, connect 0, cberr 0, other 0
Netflow With SNAT
Description
Scenario with SNAT in DUT0 WAN interface (eth1).
Scenario
Step 1: Set the following configuration in DUT0 :
set interfaces ethernet eth0 address 10.0.0.2/24 set interfaces ethernet eth0 flow egress selector TCP_SEL set interfaces ethernet eth0 flow ingress selector TCP_SEL set interfaces ethernet eth1 address 20.0.0.2/24 set interfaces ethernet eth1 traffic nat source rule 1 address masquerade set interfaces ethernet eth1 traffic nat source rule 1 selector TCP_SEL set system conntrack app-detect set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0' set system netflow app-id set system netflow destination 10.0.0.1 set system netflow engine-id 1111 set traffic selector TCP_SEL rule 1 protocol tcp
Step 2: Set the following configuration in DUT1 :
set interfaces ethernet eth0 address 10.0.0.1/24 set protocols static route 0.0.0.0/0 next-hop 10.0.0.2 set system conntrack app-detect set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Set the following configuration in DUT2 :
set interfaces ethernet eth0 address 20.0.0.1/24 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 4: Run command system conntrack clear at DUT1.
Step 5: Ping IP address 10.0.0.1 from DUT0:
admin@DUT0$ ping 10.0.0.1 count 1 size 56 timeout 1Show output
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data. 64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=0.967 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.967/0.967/0.967/0.000 ms
Step 6: Ping IP address 20.0.0.1 from DUT0:
admin@DUT0$ ping 20.0.0.1 count 1 size 56 timeout 1Show output
PING 20.0.0.1 (20.0.0.1) 56(84) bytes of data. 64 bytes from 20.0.0.1: icmp_seq=1 ttl=64 time=2.60 ms --- 20.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 2.604/2.604/2.604/0.000 ms
Step 7: Initiate a tcp connection from DUT1 to DUT2 and try to send some messages between both endpoints
admin@DUT2$ monitor test connection server 8080 tcp admin@DUT1$ monitor test connection client 20.0.0.1 8080 tcp
Step 8: Run command system netflow show flows detailed at DUT0 and check if output matches the following regular expressions:
2\s+3\s+10.0.0.1:\d+\s+20.0.0.1:\d+\s*\d*\s*\d+[^\[]*\[L4:8080\]Show output
------------------------------------------------------------------------------------------ Field Description ------------------------------------------------------------------------------------------ # Numeric flow identifier hash Hash of the flow a Shows if the flow is pending of being exported iif Input interface oif Output interface src Source IP:PORT dst Destination IP:PORT protocol Protocol identifier nexthop Next-hop [Layer 4:Port] tos Type of service identificator tcpflags TCP flags options Optional IP options tcpoptions TCP Options (MSS, Window Scaling, Selective Acknowledgements, Timestamps, Nop) pkts Packets counter bytes Bytes counter ts_first Timestamp of fist packet that passed through the flow ts_last Timestamp of last packet that passed through the flow ---------------------------------------------------------------------------------------------------------------------------------------------------- # hash a iif oif src dst protocol nexthop tos tcpflags options tcpoptions pkts bytes ts_first ts_last ---------------------------------------------------------------------------------------------------------------------------------------------------- 1 3320 0 3 2 20.0.0.1:8080 10.0.0.1:36340 36340 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 533 56 2 1177 0 2 3 10.0.0.1:36340 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 536 54
Step 9: Run command system netflow show flows detailed at DUT0 and check if output matches the following regular expressions:
3\s+2\s+20.0.0.1:\d+\s+10.0.0.1:\d+\s*\d*\s*\d+[^\[]*\[L4:8080\]Show output
------------------------------------------------------------------------------------------ Field Description ------------------------------------------------------------------------------------------ # Numeric flow identifier hash Hash of the flow a Shows if the flow is pending of being exported iif Input interface oif Output interface src Source IP:PORT dst Destination IP:PORT protocol Protocol identifier nexthop Next-hop [Layer 4:Port] tos Type of service identificator tcpflags TCP flags options Optional IP options tcpoptions TCP Options (MSS, Window Scaling, Selective Acknowledgements, Timestamps, Nop) pkts Packets counter bytes Bytes counter ts_first Timestamp of fist packet that passed through the flow ts_last Timestamp of last packet that passed through the flow ---------------------------------------------------------------------------------------------------------------------------------------------------- # hash a iif oif src dst protocol nexthop tos tcpflags options tcpoptions pkts bytes ts_first ts_last ---------------------------------------------------------------------------------------------------------------------------------------------------- 1 3320 0 3 2 20.0.0.1:8080 10.0.0.1:36340 36340 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 600 123 2 1177 0 2 3 10.0.0.1:36340 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 603 121
Step 10: Run command system netflow show status at DUT0 and check if output matches the following regular expressions:
Protocol\sversion\s10\s\(ipfix\) Export:.*Errors 0 pkts sock0:\s127.0.0.1:2055,.*err: sndbuf reached 0, connect 0, cberr 0, other 0Show output
ipt_NETFLOW 2.6, srcversion 418B6B427893697590BEEA5; dir Protocol version 10 (ipfix), refresh-rate 20, timeout-rate 30, (templates 0, active 1). Timeouts: active 1800s, inactive 15s. Maxflows 2000000 Flows: active 2 (peak 2 reached 0d0h0m ago), mem 492K, worker delay 25/250 [1..25] (40 ms, 0 us, 2:0 [cpu3]). Hash: size 62967 (mem 491K), metric 1.00 [1.00, 1.00, 1.00]. InHash: 27 pkt, 1 K, InPDU 0, 0. Rate: 344 bits/sec, 0 packets/sec; Avg 1 min: 275 bps, 0 pps; 5 min: 80 bps, 0 pps cpu# pps; <search found new [metric], trunc frag alloc maxflows>, traffic: <pkt, bytes>, drop: <pkt, bytes> Total 0; 0 78 4 [1.00], 0 0 0 0, traffic: 54, 0 MB, drop: 0, 0 K cpu0 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K cpu1 0; 0 78 4 [1.00], 0 0 0 0, traffic: 54, 0 MB, drop: 0, 0 K cpu2 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K cpu3 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K Export: Rate 0 bytes/s; Total 9 pkts, 0 MB, 2 flows; Errors 0 pkts; Traffic lost 0 pkts, 0 Kbytes, 0 flows. sock0: 127.0.0.1:2055, sndbuf 212992, filled 1, peak 1; err: sndbuf reached 0, connect 0, cberr 0, other 0
Netflow With DNAT
Description
Scenario with DNAT in DUT0 LAN interface (eth0).
Scenario
Step 1: Set the following configuration in DUT0 :
set interfaces ethernet eth0 address 10.0.0.2/24 set interfaces ethernet eth0 flow egress selector TCP_SEL set interfaces ethernet eth0 flow ingress selector TCP_SEL set interfaces ethernet eth0 traffic nat destination rule 1 address 20.0.0.1 set interfaces ethernet eth0 traffic nat destination rule 1 selector TCP_SEL set interfaces ethernet eth1 address 20.0.0.2/24 set system conntrack app-detect set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0' set system netflow app-id set system netflow destination 10.0.0.1 set system netflow engine-id 1111 set traffic selector TCP_SEL rule 1 protocol tcp
Step 2: Set the following configuration in DUT1 :
set interfaces ethernet eth0 address 10.0.0.1/24 set system conntrack app-detect set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Set the following configuration in DUT2 :
set interfaces ethernet eth0 address 20.0.0.1/24 set protocols static route 0.0.0.0/0 next-hop 20.0.0.2 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 4: Run command system conntrack clear at DUT1.
Step 5: Ping IP address 10.0.0.1 from DUT0:
admin@DUT0$ ping 10.0.0.1 count 1 size 56 timeout 1Show output
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data. 64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=0.288 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.288/0.288/0.288/0.000 ms
Step 6: Ping IP address 20.0.0.1 from DUT0:
admin@DUT0$ ping 20.0.0.1 count 1 size 56 timeout 1Show output
PING 20.0.0.1 (20.0.0.1) 56(84) bytes of data. 64 bytes from 20.0.0.1: icmp_seq=1 ttl=64 time=0.547 ms --- 20.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.547/0.547/0.547/0.000 ms
Step 7: Initiate a tcp connection from DUT1 to DUT2 and try to send some messages between both endpoints
admin@DUT2$ monitor test connection server 8080 tcp admin@DUT1$ monitor test connection client 10.0.0.2 8080 tcp
Step 8: Run command system netflow show flows detailed at DUT0 and check if output matches the following regular expressions:
2\s+3\s+10.0.0.1:\d+\s+20.0.0.1:\d+\s*\d*\s*\d+[^\[]*\[L4:8080\]Show output
------------------------------------------------------------------------------------------ Field Description ------------------------------------------------------------------------------------------ # Numeric flow identifier hash Hash of the flow a Shows if the flow is pending of being exported iif Input interface oif Output interface src Source IP:PORT dst Destination IP:PORT protocol Protocol identifier nexthop Next-hop [Layer 4:Port] tos Type of service identificator tcpflags TCP flags options Optional IP options tcpoptions TCP Options (MSS, Window Scaling, Selective Acknowledgements, Timestamps, Nop) pkts Packets counter bytes Bytes counter ts_first Timestamp of fist packet that passed through the flow ts_last Timestamp of last packet that passed through the flow ---------------------------------------------------------------------------------------------------------------------------------------------------- # hash a iif oif src dst protocol nexthop tos tcpflags options tcpoptions pkts bytes ts_first ts_last ---------------------------------------------------------------------------------------------------------------------------------------------------- 1 cd0f 0 2 3 10.0.0.1:47340 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 477 56 2 2af1 0 3 2 20.0.0.1:8080 10.0.0.1:47340 47340 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 476 56
Step 9: Run command system netflow show flows detailed at DUT0 and check if output matches the following regular expressions:
3\s+2\s+20.0.0.1:\d+\s+10.0.0.1:\d+\s*\d*\s*\d+[^\[]*\[L4:8080\]Show output
------------------------------------------------------------------------------------------ Field Description ------------------------------------------------------------------------------------------ # Numeric flow identifier hash Hash of the flow a Shows if the flow is pending of being exported iif Input interface oif Output interface src Source IP:PORT dst Destination IP:PORT protocol Protocol identifier nexthop Next-hop [Layer 4:Port] tos Type of service identificator tcpflags TCP flags options Optional IP options tcpoptions TCP Options (MSS, Window Scaling, Selective Acknowledgements, Timestamps, Nop) pkts Packets counter bytes Bytes counter ts_first Timestamp of fist packet that passed through the flow ts_last Timestamp of last packet that passed through the flow ---------------------------------------------------------------------------------------------------------------------------------------------------- # hash a iif oif src dst protocol nexthop tos tcpflags options tcpoptions pkts bytes ts_first ts_last ---------------------------------------------------------------------------------------------------------------------------------------------------- 1 cd0f 0 2 3 10.0.0.1:47340 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 514 93 2 2af1 0 3 2 20.0.0.1:8080 10.0.0.1:47340 47340 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 513 93
Step 10: Run command system netflow show status at DUT0 and check if output matches the following regular expressions:
Protocol\sversion\s10\s\(ipfix\) Export:.*Errors 0 pkts sock0:\s127.0.0.1:2055,.*err: sndbuf reached 0, connect 0, cberr 0, other 0Show output
ipt_NETFLOW 2.6, srcversion 418B6B427893697590BEEA5; dir Protocol version 10 (ipfix), refresh-rate 20, timeout-rate 30, (templates 0, active 1). Timeouts: active 1800s, inactive 15s. Maxflows 2000000 Flows: active 2 (peak 2 reached 0d0h0m ago), mem 492K, worker delay 25/250 [1..25] (44 ms, 0 us, 2:0 [cpu3]). Hash: size 62967 (mem 491K), metric 1.00 [1.00, 1.00, 1.00]. InHash: 27 pkt, 1 K, InPDU 0, 0. Rate: 344 bits/sec, 0 packets/sec; Avg 1 min: 394 bps, 0 pps; 5 min: 144 bps, 0 pps cpu# pps; <search found new [metric], trunc frag alloc maxflows>, traffic: <pkt, bytes>, drop: <pkt, bytes> Total 0; 0 117 6 [1.00], 0 0 0 0, traffic: 81, 0 MB, drop: 0, 0 K cpu0 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K cpu1 0; 0 117 6 [1.00], 0 0 0 0, traffic: 81, 0 MB, drop: 0, 0 K cpu2 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K cpu3 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K Export: Rate 0 bytes/s; Total 16 pkts, 0 MB, 4 flows; Errors 0 pkts; Traffic lost 0 pkts, 0 Kbytes, 0 flows. sock0: 127.0.0.1:2055, sndbuf 212992, filled 1, peak 1; err: sndbuf reached 0, connect 0, cberr 0, other 0
Netflow With SDNAT
Description
Scenario with SNAT in DUT0 WAN interface (eth1)
and DNAT in DUT0 LAN interface (eth0).
Scenario
Step 1: Set the following configuration in DUT0 :
set interfaces ethernet eth0 address 10.0.0.2/24 set interfaces ethernet eth0 flow egress selector TCP_SEL set interfaces ethernet eth0 flow ingress selector TCP_SEL set interfaces ethernet eth0 traffic nat destination rule 1 address 20.0.0.1 set interfaces ethernet eth0 traffic nat destination rule 1 selector TCP_SEL set interfaces ethernet eth1 address 20.0.0.2/24 set interfaces ethernet eth1 traffic nat source rule 1 address masquerade set interfaces ethernet eth1 traffic nat source rule 1 selector TCP_SEL set system conntrack app-detect set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0' set system netflow app-id set system netflow destination 10.0.0.1 set system netflow engine-id 1111 set traffic selector TCP_SEL rule 1 protocol tcp
Step 2: Set the following configuration in DUT1 :
set interfaces ethernet eth0 address 10.0.0.1/24 set system conntrack app-detect set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Set the following configuration in DUT2 :
set interfaces ethernet eth0 address 20.0.0.1/24 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 4: Run command system conntrack clear at DUT1.
Step 5: Ping IP address 10.0.0.1 from DUT0:
admin@DUT0$ ping 10.0.0.1 count 1 size 56 timeout 1Show output
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data. 64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=0.340 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.340/0.340/0.340/0.000 ms
Step 6: Ping IP address 20.0.0.1 from DUT0:
admin@DUT0$ ping 20.0.0.1 count 1 size 56 timeout 1Show output
PING 20.0.0.1 (20.0.0.1) 56(84) bytes of data. 64 bytes from 20.0.0.1: icmp_seq=1 ttl=64 time=12.0 ms --- 20.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 11.994/11.994/11.994/0.000 ms
Step 7: Initiate a tcp connection from DUT1 to DUT2 and try to send some messages between both endpoints
admin@DUT2$ monitor test connection server 8080 tcp admin@DUT1$ monitor test connection client 10.0.0.2 8080 tcp
Step 8: Run command system netflow show flows detailed at DUT0 and check if output matches the following regular expressions:
2\s+3\s+10.0.0.1:\d+\s+20.0.0.1:\d+\s*\d*\s*\d+[^\[]*\[L4:8080\]Show output
------------------------------------------------------------------------------------------ Field Description ------------------------------------------------------------------------------------------ # Numeric flow identifier hash Hash of the flow a Shows if the flow is pending of being exported iif Input interface oif Output interface src Source IP:PORT dst Destination IP:PORT protocol Protocol identifier nexthop Next-hop [Layer 4:Port] tos Type of service identificator tcpflags TCP flags options Optional IP options tcpoptions TCP Options (MSS, Window Scaling, Selective Acknowledgements, Timestamps, Nop) pkts Packets counter bytes Bytes counter ts_first Timestamp of fist packet that passed through the flow ts_last Timestamp of last packet that passed through the flow ---------------------------------------------------------------------------------------------------------------------------------------------------- # hash a iif oif src dst protocol nexthop tos tcpflags options tcpoptions pkts bytes ts_first ts_last ---------------------------------------------------------------------------------------------------------------------------------------------------- 1 4125 0 3 2 20.0.0.1:8080 10.0.0.1:53246 53246 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 477 43 2 77a6 0 2 3 10.0.0.1:53246 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 477 43
Step 9: Run command system netflow show flows detailed at DUT0 and check if output matches the following regular expressions:
3\s+2\s+20.0.0.1:\d+\s+10.0.0.1:\d+\s*\d*\s*\d+[^\[]*\[L4:8080\]Show output
------------------------------------------------------------------------------------------ Field Description ------------------------------------------------------------------------------------------ # Numeric flow identifier hash Hash of the flow a Shows if the flow is pending of being exported iif Input interface oif Output interface src Source IP:PORT dst Destination IP:PORT protocol Protocol identifier nexthop Next-hop [Layer 4:Port] tos Type of service identificator tcpflags TCP flags options Optional IP options tcpoptions TCP Options (MSS, Window Scaling, Selective Acknowledgements, Timestamps, Nop) pkts Packets counter bytes Bytes counter ts_first Timestamp of fist packet that passed through the flow ts_last Timestamp of last packet that passed through the flow ---------------------------------------------------------------------------------------------------------------------------------------------------- # hash a iif oif src dst protocol nexthop tos tcpflags options tcpoptions pkts bytes ts_first ts_last ---------------------------------------------------------------------------------------------------------------------------------------------------- 1 4125 0 3 2 20.0.0.1:8080 10.0.0.1:53246 53246 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 515 81 2 77a6 0 2 3 10.0.0.1:53246 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 515 81
Step 10: Run command system netflow show status at DUT0 and check if output matches the following regular expressions:
Protocol\sversion\s10\s\(ipfix\) Export:.*Errors 0 pkts sock0:\s127.0.0.1:2055,.*err: sndbuf reached 0, connect 0, cberr 0, other 0Show output
ipt_NETFLOW 2.6, srcversion 418B6B427893697590BEEA5; dir Protocol version 10 (ipfix), refresh-rate 20, timeout-rate 30, (templates 0, active 1). Timeouts: active 1800s, inactive 15s. Maxflows 2000000 Flows: active 2 (peak 2 reached 0d0h1m ago), mem 492K, worker delay 25/250 [1..25] (12 ms, 0 us, 2:0 [cpu3]). Hash: size 62967 (mem 491K), metric 1.00 [1.00, 1.00, 1.00]. InHash: 27 pkt, 1 K, InPDU 0, 0. Rate: 3240 bits/sec, 6 packets/sec; Avg 1 min: 817 bps, 0 pps; 5 min: 272 bps, 0 pps cpu# pps; <search found new [metric], trunc frag alloc maxflows>, traffic: <pkt, bytes>, drop: <pkt, bytes> Total 6; 0 156 8 [1.00], 0 0 0 0, traffic: 108, 0 MB, drop: 0, 0 K cpu0 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K cpu1 6; 0 156 8 [1.00], 0 0 0 0, traffic: 108, 0 MB, drop: 0, 0 K cpu2 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K cpu3 0; 0 0 0 [1.00], 0 0 0 0, traffic: 0, 0 MB, drop: 0, 0 K Export: Rate 0 bytes/s; Total 23 pkts, 0 MB, 6 flows; Errors 0 pkts; Traffic lost 0 pkts, 0 Kbytes, 0 flows. sock0: 127.0.0.1:2055, sndbuf 212992, filled 1, peak 1; err: sndbuf reached 0, connect 0, cberr 0, other 0