Suricata does not block traffic

  • Hello!

    I have PFsense 2.3.2-RELEASE-p1 and suricata 3.1.2_2 in Legacy mode, because inline does not start.

    With suricata I tryed to block udp flood like this

    19:07:19.687871 80:71:1f:c6:YY:YY > a0:36:9f:08:YY:YY, ethertype IPv4 (0x0800), length 60: (tos 0x0, ttl 154, id 7065, offset 0, flags [none], proto UDP (17), length 46) > 85.143.XXX.XXX.2645: [bad udp cksum 0x9bae -> 0x0be7!] UDP, length 18
    	0x0000:  4500 002e 1b99 0000 9a11 c7fe d8e4 4432  E.............D2
    	0x0010:  558f ca81 b696 0902 001a 9bae 6970 343a  U...........ip4:
    	0x0020:  XXXX XXXX XXXX XXXX XXXX XXXX XXXX        85.143.XXX.XXX

    I created custom rule:

    drop udp any any -> 85.143.XXX.XXX/32 2645 (msg:"XXX.XXX ip4"; content:"ip4"; sid:9999008; rev:1;)

    I've got a lot of message in block.log, but traffic steal pass through PFsense and reached "protected" IP.

    What I did wrong?

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