Solved Data Diode problems with syslog-ng

CShell said:
Glad you got your problem fixed.

One Question though: How come the AI wasn't able to figure this out in the first place?
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I wasn't asking about it. Just the syslog-ng config.
This was a problem with static arp setting.
Try it. Ask your favorite LLM where could be a problem with uni-directional gateway:
I see the packets on Receiver side (over UDP via data diode) send from Sender machine, where static ARP was set of the Receiver network interface (em0). Both run FreeBSD 14.3., no pf configured. But netcat neither syslog-ng do not get the packets. Give me simple testing options to find where the problem could be.
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Brave:

.....Step-by-step instructions
On the Sender, verify the static ARP entry:
arp -a | grep <Receiver_IP>

Ensure it shows the correct MAC address and is bound to em0.
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That would solve it. But I did not expect to be the problem on network side, since tcpdump showed traffic. So I did not ask for help.
 
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