Packets from the same hosts are blocked for few minutes if packet with invalid checksum, or with 1 byte data or of predefined TTL is received.
vulners.com/securityvulns/securityvulns:doc:10301
vulners.com/securityvulns/securityvulns:doc:10302
vulners.com/securityvulns/securityvulns:doc:11728
vulners.com/securityvulns/securityvulns:doc:11729
vulners.com/securityvulns/securityvulns:doc:11730