NUM_SEQ_TO_REMEMBER 20 include/linux/netfilter/nf_conntrack_ftp.h u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER]; NUM_SEQ_TO_REMEMBER 360 net/netfilter/nf_conntrack_ftp.c if (info->seq_aft_nl_num[dir] < NUM_SEQ_TO_REMEMBER) {