Fortinet transparent mode (devices can not reach each other)

[keithli]

Dear All, 

             i'm new in Fortinet, and I have a question would like to seek for your assist, current i am deploying a fortinet 101F model to our customer, and that fortinet 101F are configured as transparent mode behind a internet firewall, a HPE server connected to fortinet port 1, and port X1 interface which is running 10G via a Fiber cable connect to a H3C switches as uplink, actually the foritnet is just working as a LAN switch, and you might question why it needs to use Fortinet, you can use just use a L2 switch, the reason of this is customer has a Fortinet and want to make use of this device, and the issue now is when i connected the X1 internet 10G fiber to the H3C, its affected the network some devices wont be able to reach each other, and when i tried to disable the uplink X1 interface, the issue disappeared right away, just wonder what setting caused such issue ? 

  And i have one throught, can i simply create a firewall policy, one is in-interface (port 1) and out-interface (X1) so that i can enable security profile in this firewall policy in it, any help would be appreicated 

Keith 

[lgupta]

Hello keithli,

Can you please share the output of:
show system interface x1

show system interface port1

Thanks.
-lgupta

[keithli]

currently the firewall is in our customer's site and i can not gather these logs until i onsite again 

[toptopbug]

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[mle2802]

H @keithli,

Can you please try to create a same vlan under internal and external interface, tagging traffic with correct vlan ID and test again. Please refer to this document for more information "https://community.fortinet.com/t5/FortiGate/Technical-Note-Configure-a-FortiGate-unit-in-Transparent...

Regards,
Minh

[toptopbug]

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