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Fortinet Monitoring lan to zabbix server

Forum|Forum|1 year ago
June 1, 2025
8 replies
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Good evening

I want to monitor a lan to a zabbix server with ip address 192.168.1.87 connected in bridge adapter but a tracer to a zabbix server and i see the ip 10.50.3.21

FortiGate-HomeLab # show system interface port1
config system interface
edit "port1"
set vdom "root"
set ip 192.168.55.10 255.255.255.0
set allowaccess ping https ssh snmp http fabric
set type physical
set lldp-reception enable
set role wan
set snmp-index 1
next
end

FortiGate-HomeLab #

FortiGate-HomeLab # show system interface vlan20
config system interface
edit "vlan20"
set vdom "root"
set ip 10.10.20.3 255.255.255.0
set allowaccess ping https ssh snmp fabric
set device-identification enable
set role lan
set snmp-index 29
set secondary-IP enable
set interface "port2"
set vlanid 20
next
end

FortiGate-HomeLab #

FortiGate-HomeLab # show firewall policy
config firewall policy
edit 1
set name "vlan20-port1"
set uuid a58b44a4-3d9d-51f0-e235-a09bba7147a0
set srcintf "vlan20"
set dstintf "port1"
set action accept
set srcaddr "vlan20"
set dstaddr "zbx"
set schedule "always"
set service "DHCP" "DNS" "PING" "SNMP" "TRACEROUTE"
set logtraffic all
set logtraffic-start enable
set nat enable
next
edit 2
set name "port1-vlan20"
set uuid ae0cc802-3e3b-51f0-8fec-eb0ba905a1ca
set srcintf "port1"
set dstintf "vlan20"
set action accept
set srcaddr "zbx"
set dstaddr "vlan20"
set schedule "always"
set service "ALL"
set logtraffic all
set logtraffic-start enable
set nat enable
set ippool enable
set poolname "zabbiz"
next
end

FortiGate-HomeLab #

Grettings

Best answer by Dhruvin_patel

Please make sure that you have a policy to allow the traffic.

Please run the debug flow to identify if the fortigate is dropping/allowing the traffic. refer: https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-First-steps-to-troubleshoot-connectivity/ta-p/192560

Best Regards!

Dhruvin_patel

Staff

Greetings!

Which device uses the IP 10.50.3.22?

Review the firewall policies to ensure traffic is allowed between the Zabbix server and the LAN.

Best Regards!

josemusante1Author

New Member

Greetings

There is the port for this IP

Thanks

Best Regards

Dhruvin_patelAnswer

Staff

Please make sure that you have a policy to allow the traffic.

Please run the debug flow to identify if the fortigate is dropping/allowing the traffic. refer: https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-First-steps-to-troubleshoot-connectivity/ta-p/192560

Best Regards!

josemusante1Author

New Member

I have this in the debug flow

. flag [S], seq 3700023503, ack 0, win 65535"
id=65308 trace_id=103 func=resolve_ip_tuple_fast line=5983 msg="Find an existing session, id-000002af, original direction"
id=65308 trace_id=104 func=print_pkt_detail line=5895 msg="vd-root:0 received a packet(proto=6, 192.168.55.10:18790->192.168.1.87:179) tun_id=0.0.0.0 from local. flag [S], seq 3700023503, ack 0, win 65535"
id=65308 trace_id=104 func=resolve_ip_tuple_fast line=5983 msg="Find an existing session, id-000002af, original direction"
id=65308 trace_id=105 func=print_pkt_detail line=5895 msg="vd-root:0 received a packet(proto=6, 192.168.55.10:18797->192.168.1.87:179) tun_id=0.0.0.0 from local. flag [S], seq 986106276, ack 0, win 65535"
id=65308 trace_id=105 func=init_ip_session_common line=6076 msg="allocate a new session-000002b8, tun_id=0.0.0.0"
id=65308 trace_id=106 func=print_pkt_detail line=5895 msg="vd-root:0 received a packet(proto=6, 192.168.55.10:18797->192.168.1.87:179) tun_id=0.0.0.0 from local. flag [S], seq 986106276, ack 0, win 65535"
id=65308 trace_id=106 func=resolve_ip_tuple_fast line=5983 msg="Find an existing session, id-000002b8, original direction"
id=65308 trace_id=107 func=print_pkt_detail line=5895 msg="vd-root:0 received a packet(proto=6, 192.168.55.10:18797->192.168.1.87:179) tun_id=0.0.0.0 from local. flag [S], seq 986106276, ack 0, win 65535"
id=65308 trace_id=107 func=resolve_ip_tuple_fast line=5983 msg="Find an existing session, id-000002b8, original direction"
id=65308 trace_id=108 func=print_pkt_detail line=5895 msg="vd-root:0 received a packet(proto=6, 192.168.55.10:18797->192.168.1.87:179) tun_id=0.0.0.0 from local. flag [S], seq 986106276, ack 0, win 65535"
id=65308 trace_id=108 func=resolve_ip_tuple_fast line=5983 msg="Find an existing session, id-000002b8, original direction"
id=65308 trace_id=109 func=print_pkt_detail line=5895 msg="vd-root:0 received a packet(proto=6, 192.168.55.10:18797->192.168.1.87:179) tun_id=0.0.0.0 from local. flag [S], seq 986106276, ack 0, win 65535"
id=65308 trace_id=109 func=resolve_ip_tuple_fast line=5983 msg="Find an existing session, id-000002b8, original direction"
id=65308 trace_id=110 func=print_pkt_detail line=5895 msg="vd-root:0 received a packet(proto=6, 192.168.55.10:18797->192.168.1.87:179) tun_id=0.0.0.0 from local. flag [S], seq 986106276, ack 0, win 65535"
id=65308 trace_id=110 func=init_ip_session_common line=6076 msg="allocate a new session-000002d7, tun_id=0.0.0.0"

Best Regards

josemusante1Author

New Member

This is the result of sniffer traffic

FortiGate-HomeLab # diagnose sniffer packet any "host 192.168.1.87"
Using Original Sniffing Mode
interfaces=[any]
filters=[host 192.168.1.87]
71.4294963555 192.168.55.10.23154 -> 192.168.1.87.179: syn 314272394
72.4294962127 192.168.55.10.23154 -> 192.168.1.87.179: syn 314272394
74.4294963386 192.168.55.10.23154 -> 192.168.1.87.179: syn 314272394
78.008669 192.168.55.10.23154 -> 192.168.1.87.179: syn 314272394
86.035127 192.168.55.10.23154 -> 192.168.1.87.179: syn 314272394
102.074491 192.168.55.10.23154 -> 192.168.1.87.179: syn 314272394
253.4294950907 192.168.55.10.23349 -> 192.168.1.87.179: syn 2553895484
254.4294958160 192.168.55.10.23349 -> 192.168.1.87.179: syn 2553895484
256.4294959228 192.168.55.10.23349 -> 192.168.1.87.179: syn 2553895484
260.4294966823 192.168.55.10.23349 -> 192.168.1.87.179: syn 2553895484
268.025163 192.168.55.10.23349 -> 192.168.1.87.179: syn 2553895484
284.076056 192.168.55.10.23349 -> 192.168.1.87.179: syn 2553895484
331.4294949286 192.168.55.10.162 -> 192.168.1.87.162: udp 113
331.4294950280 192.168.55.10.162 -> 192.168.1.87.162: udp 137
331.4294950496 192.168.55.10.162 -> 192.168.1.87.162: udp 135
331.4294950555 192.168.55.10.162 -> 192.168.1.87.162: udp 159
349.210770 192.168.55.10.162 -> 192.168.1.87.162: udp 135
349.211610 192.168.55.10.162 -> 192.168.1.87.162: udp 159
422.4294954341 192.168.55.10.23727 -> 192.168.1.87.179: syn 1695278053
423.4294957214 192.168.55.10.23727 -> 192.168.1.87.179: syn 1695278053
425.4294956574 192.168.55.10.23727 -> 192.168.1.87.179: syn 1695278053
429.4294960954 192.168.55.10.23727 -> 192.168.1.87.179: syn 1695278053
437.026906 192.168.55.10.23727 -> 192.168.1.87.179: syn 1695278053

Grettings

aipodka1

New Member

Sounds very interesting! I am not too great with API and scripting, but I will read up on it, check what I can find on Google, thx man! :D

josemusante1Author

New Member

And i have this ports telnet in the traceroute.

josemusante1Author

New Member

Grettings now i testing with my vlan interface but is not responding in the sniffer

Only respond with wan port1

josemusante1Author

New Member

Now finally i have a debug flow with vlan 20

d=65308 trace_id=105 func=print_pkt_detail line=5895 msg="vd-root:0 received a packet(proto=17, 10.10.20.3:162->192.168.1.88:162) tun_id=0.0.0.0 from local. "
id=65308 trace_id=105 func=init_ip_session_common line=6076 msg="allocate a new session-000003fd, tun_id=0.0.0.0"
id=65308 trace_id=106 func=print_pkt_detail line=5895 msg="vd-root:0 received a packet(proto=17, 10.10.20.3:162->192.168.1.88:162) tun_id=0.0.0.0 from local. "
id=65308 trace_id=106 func=resolve_ip_tuple_fast line=5983 msg="Find an existing session, id-000003fd, original direction"
id=65308 trace_id=107 func=print_pkt_detail line=5895 msg="vd-root:0 received a packet(proto=17, 10.10.20.3:162->192.168.1.88:162) tun_id=0.0.0.0 from local. "
id=65308 trace_id=107 func=resolve_ip_tuple_fast line=5983 msg="Find an existing session, id-000003fd, original direction"
id=65308 trace_id=108 func=print_pkt_detail line=5895 msg="vd-root:0 received a packet(proto=17, 10.10.20.3:162->192.168.1.88:162) tun_id=0.0.0.0 from local. "
id=65308 trace_id=108 func=resolve_ip_tuple_fast line=5983 msg="Find an existing session, id-000003fd, original direction"

Grettings

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