topic FTD Inside interface not pingable from same subnet in Network Security

FTD Inside interface not pingable from same subnet

keithcclark71 — Tue, 12 Jul 2022 18:17:09 GMT

Guys I am having the strangest issue with all 3 FTD's where I assign 192.168.3.1 to port 1/1 within FMC. There is no subinterface etc it is a IP address assigned to the physical port. If i plug into an unmanaged switch I cannot ping 192.168.3.1 while connected with my laptop or other systems on 192.168.3. subnet. I can ping management at 192.168.3.11 from all systems. If i plug in laptop direct to port at this time I still cannot ping it. Now get this, if I restart the FTD and have my laptop plugged direct to 192.168.3.1 I can ping once it has restarted. The second i unplug and plug into unmanaged switch(Doesnt matter manufacturer i tried several) then it does not respond. WTH is up with this?m It seems that if I plug into a unifi switch I do not have this issue. What the heck is going on, the only thing different is unifi is trunk all by default but this FTD 192.168.3.1 is a physical port not VLAN assigned.

Re: FTD Inside interface not pingable from same subnet

balaji.bandi — Tue, 12 Jul 2022 18:30:51 GMT

is this virtual or Physical ? are you able to ping from FTD to other side ?

Can you post the confg here. and route

Re: FTD Inside interface not pingable from same subnet

keithcclark71 — Tue, 12 Jul 2022 22:14:01 GMT

I could ping from the FTD to host but host not to it. Maybe bad interface?

Interface Ethernet1/1 "Inside", is up, line protocol is up
Hardware is EtherSVI, BW 1000 Mbps, DLY 10 usec
MAC address e069.ba7c.fe48, MTU 1500
IP address 192.168.3.1, subnet mask 255.255.255.0
Traffic Statistics for "Inside":
72 packets input, 4725 bytes
5 packets output, 140 bytes
65 packets dropped
1 minute input rate 0 pkts/sec, 54 bytes/sec
1 minute output rate 0 pkts/sec, 1 bytes/sec
1 minute drop rate, 0 pkts/sec
5 minute input rate 0 pkts/sec, 0 bytes/sec
5 minute output rate 0 pkts/sec, 0 bytes/sec
5 minute drop rate, 0 pkts/sec