CONNTRACK=conntrack SRC=1.1.1.1 DST=2.2.2.2 SPORT=2005 DPORT=21 case $1 in dump) echo "Dumping conntrack table" $CONNTRACK -L ;; flush) echo "Flushing conntrack table" $CONNTRACK -F ;; new) echo "creating a new conntrack" $CONNTRACK -I --orig-src $SRC --orig-dst $DST \ --reply-src $DST --reply-dst $SRC -p tcp \ --orig-port-src $SPORT --orig-port-dst $DPORT \ --reply-port-src $DPORT --reply-port-dst $SPORT \ --state LISTEN -u SEEN_REPLY -t 50 ;; new-simple) echo "creating a new conntrack (simplified)" $CONNTRACK -I -s $SRC -d $DST \ -p tcp --sport $SPORT --dport $DPORT \ --state LISTEN -u SEEN_REPLY -t 50 ;; new-nat) echo "creating a new conntrack (NAT)" $CONNTRACK -I -s $SRC -d $DST \ -p tcp --sport $SPORT --dport $DPORT \ --state LISTEN -u SEEN_REPLY -t 50 --dst-nat 8.8.8.8 ;; get) echo "getting a conntrack" $CONNTRACK -G -s $SRC -d $DST \ -p tcp --sport $SPORT --dport $DPORT ;; change) echo "change a conntrack" $CONNTRACK -U -s $SRC -d $DST \ -p tcp --sport $SPORT --dport $DPORT \ --state TIME_WAIT -u ASSURED,SEEN_REPLY -t 500 ;; delete) $CONNTRACK -D -s $SRC -d $DST \ -p tcp --sport $SPORT --dport $DPORT ;; output) proc=$(cat /proc/net/ip_conntrack | wc -l) netl=$($CONNTRACK -L | wc -l) count=$(cat /proc/sys/net/ipv4/netfilter/ip_conntrack_count) if [ $proc -ne $netl ]; then echo "proc is $proc and netl is $netl and count is $count" else if [ $proc -ne $count ]; then echo "proc is $proc and netl is $netl and count is $count" else echo "now $proc" fi fi ;; dump-expect) $CONNTRACK -L expect ;; flush-expect) $CONNTRACK -F expect ;; create-expect) # requires modprobe ip_conntrack_ftp $CONNTRACK -I expect --orig-src $SRC --orig-dst $DST \ --tuple-src 4.4.4.4 --tuple-dst 5.5.5.5 \ --mask-src 255.255.255.0 --mask-dst 255.255.255.255 \ -p tcp --orig-port-src $SPORT --orig-port-dst $DPORT \ -t 200 --tuple-port-src 10240 --tuple-port-dst 10241\ --mask-port-src 10 --mask-port-dst 300 ;; get-expect) $CONNTRACK -G expect --orig-src 4.4.4.4 --orig-dst 5.5.5.5 \ --p tcp --orig-port-src 10240 --orig-port-dst 10241 ;; delete-expect) $CONNTRACK -D expect --orig-src 4.4.4.4 \ --orig-dst 5.5.5.5 -p tcp --orig-port-src 10240 \ --orig-port-dst 10241 ;; *) echo "Usage: $0 [dump" echo " |new" echo " |new-simple" echo " |new-nat" echo " |get" echo " |change" echo " |delete" echo " |output" echo " |flush" echo " |dump-expect" echo " |flush-expect" echo " |create-expect" echo " |get-expect" echo " |delete-expect]" ;; esac