IP Normalizations #f IP Field Normalization performed IP Field Normalization Performed Version Non-IPv4 packets dropped.13 DF Dropif DF set and offset>0. 2 Header Len Drop if hdr_len too small 14 Zero flag Clear 3 Header Len Drop if hdr_len too large 15 Src addr Drop if class d or E 4 Diffserv Clear field 16 Src addr Drop if MSByte=127 or 0 5 ECN Clear field 17 Src addr Drop if 255. 255.255 255 6 Total Len Drop if tot_len> link lay len 18 Dst addr Drop if class E 7 Total Len Trim if tot len link layer len 19 Dst addr Drop if MSByte=127 or 0 8 IP Identifier Encrypt ID 20 Dst addr Drop if 255.255.255.255 9 Protocol Enforce specific protocols TTL 21 Raise TTl to configured value Protocol Pass packet to TCP UDP ICMP handlers 22 Checksum Verify, drop if incorrect 1o Frag offset Reassemble fragmented 23 IPoptions Remove IP options packets 24 IP options Zero padding bytes Frag offset Drop if offset+ len > 64KB11 IP Normalizations # IP Field Normalization Performed 1 Version Non-IPv4 packets dropped. 2 Header Len Drop if hdr_len too small. 3 Header Len Drop if hdr_len too large. 4 Diffserv Clear field. 5 ECN Clear field. 6 Total Len Drop if tot_len > link layer len. 7 Total Len Trim if tot_len < link layer len. 8 IP Identifier Encrypt ID. 9 Protocol Enforce specific protocols. - Protocol Pass packet to TCP,UDP,ICMP handlers. 10 Frag offset Reassemble fragmented packets. 11 Frag offset Drop if offset + len > 64KB. # IP Field Normalization Performed 13 DF Drop if DF set and offset > 0. 14 Zero flag Clear. 15 Src addr Drop if class D or E. 16 Src addr Drop if MSByte=127 or 0. 17 Src addr Drop if 255.255.255.255. 18 Dst addr Drop if class E. 19 Dst addr Drop if MSByte=127 or 0. 20 Dst addr Drop if 255.255.255.255. 21 TTL Raise TTL to configured value. 22 Checksum Verify, drop if incorrect. 23 IP options Remove IP options. 24 IP options Zero padding bytes