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=0.365 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.365/0.365/0.365/0.000 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=1.01 ms --- 20.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 1.014/1.014/1.014/0.000 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 649a 0 3 2 20.0.0.1:8080 10.0.0.1:52010 52010 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 489 43 2 defc 0 2 3 10.0.0.1:52010 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 489 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 649a 0 3 2 20.0.0.1:8080 10.0.0.1:52010 52010 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 524 78 2 defc 0 2 3 10.0.0.1:52010 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 524 78
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] (56 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: 0 bits/sec, 0 packets/sec; Avg 1 min: 113 bps, 0 pps; 5 min: 61 bps, 0 pps cpu# pps; <search found new [metric], trunc frag alloc maxflows>, traffic: <pkt, bytes>, drop: <pkt, bytes> Total 0; 0 64 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 64 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 14 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 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=0.331 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.331/0.331/0.331/0.000 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=0.694 ms --- 20.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.694/0.694/0.694/0.000 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 839f 0 2 3 10.0.0.1:38048 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 470 48 2 60f0 0 3 2 20.0.0.1:8080 10.0.0.1:38048 38048 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 469 48
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 839f 0 2 3 10.0.0.1:38048 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 510 88 2 60f0 0 3 2 20.0.0.1:8080 10.0.0.1:38048 38048 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 509 88
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] (84 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: 0 bits/sec, 0 packets/sec; Avg 1 min: 294 bps, 0 pps; 5 min: 125 bps, 0 pps cpu# pps; <search found new [metric], trunc frag alloc maxflows>, traffic: <pkt, bytes>, drop: <pkt, bytes> Total 0; 0 103 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; 0 103 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 20 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 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=12.2 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 12.151/12.151/12.151/0.000 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=16.7 ms --- 20.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 16.711/16.711/16.711/0.000 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 b738 0 3 2 20.0.0.1:8080 10.0.0.1:35814 35814 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 528 67 2 2cae 0 2 3 10.0.0.1:35814 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 528 67
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 b738 0 3 2 20.0.0.1:8080 10.0.0.1:35814 35814 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 612 151 2 2cae 0 2 3 10.0.0.1:35814 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 612 151
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] (24 ms, 0 us, 2:0 [cpu0]). Hash: size 62967 (mem 491K), metric 1.00 [1.00, 1.00, 1.00]. InHash: 27 pkt, 1 K, InPDU 0, 0. Rate: 0 bits/sec, 0 packets/sec; Avg 1 min: 386 bps, 0 pps; 5 min: 182 bps, 0 pps cpu# pps; <search found new [metric], trunc frag alloc maxflows>, traffic: <pkt, bytes>, drop: <pkt, bytes> Total 0; 0 142 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 0; 0 142 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 26 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
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=0.943 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.943/0.943/0.943/0.000 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=1.53 ms --- 20.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 1.525/1.525/1.525/0.000 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 de27 0 3 2 20.0.0.1:8080 10.0.0.1:45642 45642 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 537 70 2 425b 0 2 3 10.0.0.1:45642 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 537 70
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 de27 0 3 2 20.0.0.1:8080 10.0.0.1:45642 45642 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 13 784 585 118 2 425b 0 2 3 10.0.0.1:45642 20.0.0.1:8080 8080 0.0.0.0[L4:8080] 0x0 0x1b 0x0 0xf1000000 14 836 585 118
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] (24 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: 3240 bits/sec, 6 packets/sec; Avg 1 min: 784 bps, 0 pps; 5 min: 307 bps, 0 pps cpu# pps; <search found new [metric], trunc frag alloc maxflows>, traffic: <pkt, bytes>, drop: <pkt, bytes> Total 6; 0 181 10 [1.00], 0 0 0 0, traffic: 135, 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; 0 181 10 [1.00], 0 0 0 0, traffic: 135, 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 32 pkts, 0 MB, 8 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