Triggering inspector rules (arp_spoof / stream)

Hello Snort Community,

I am a student who just started working with Snort3 (Version: 3.1.18.0).
For my Project I need to detect arp spoofing and TCP/SYN flood attacks.

For the arp_spoof inspector I configured the ip/mac address mapping in the configuration file.
I also wrote rules for the four arp_spoof inspector events.
When I run an arp spoofing attack I get a log entry for rule 4 "attempted ARP cache overwrite attack".
But when a message is sent to a host were the destination ip/mac address is spoofed, I do not get a log entry for rule 3.
I looked at the send packages and the ip/mac address do not match the configured values. I do not know why these rules are not triggered.
My config looks like this (inside of my snort.lua file):
arp_spoof = {
    hosts = {
        {ip ="x.x.x.x", mac ="xx:xx:xx:xx:xx:xx"},
    }
}

My rule file looks like this:
alert (msg: "some msg1", gid: 112; sid: 1;)
alert (msg: "some msg2", gid: 112; sid: 2;)
alert (msg: "some msg3", gid: 112; sid: 3;)
alert (msg: "some msg4", gid: 112; sid: 4;)


Besides that I am trying to trigger rule 1 of the stream_inspector to detect SYN flood attacks.
I looked into the code but I could not find what the conditions are to trigger the rule.
But so far I could not trigger this rule.
My own rule which just counts incomming packtes with "flag:S" works perfectly though.
I again enabled the inspector in my config and wrote rules for that event.

My config looks like this (inside my snort.lua file):
stream = {}
My rule file looks like this:
alert (msg: "msg1"; gid: 135; sid:1;)


I would really appreciate any support on triggering these events.

Thanks for any advice!


Best regards
Julia
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