Chain USR_FORWARD (1 references)
 pkts bytes 	target     		prot 	opt in     out    	source		destination         
    0     0 		LOGACCEPT 	all  --   *      *       		remote-support        	0.0.0.0/0           
   19   912 	ACCEPT     	tcp  --  *      *       		192.168.50.0/24      	smtp-server 1        	tcp spts:1:65535 dpt:25 
 2438  117K	 ACCEPT     	tcp  --  *      *       		192.168.50.0/24      	pop-server 1       	tcp spts:1:65535 dpt:110 
    0     0 		ACCEPT     	tcp  --  *      *       		192.168.50.104       	smtp-server 2       	tcp spts:1:65535 dpt:25 
    0     0 		ACCEPT     	tcp  --  *      *       		192.168.50.104       	popserver 2       	tcp spts:1:65535 dpt:110 
    0     0 		ACCEPT     	tcp  --  *      *       		192.168.50.104       	website       	tcp spts:1024:65535 dpts:20:21 
    0     0 		ACCEPT     	tcp  --  *      *       		192.168.50.104       	website       	tcp spts:1024:65535 dpt:21 
    0     0 		ACCEPT     	tcp  --  *      *       		192.168.50.104       	website		tcp spts:1024:65535 dpts:20:21 
    0     0 		ACCEPT  		tcp  --  *      *       		192.168.50.104       	website      	tcp spts:1024:65535 dpt:21 
  198 12264 	ACCEPT     	all  --   *      *       		192.168.40.0/24     	 0.0.0.0/0           
   18  1080 	ACCEPT     	tcp  --  *      *       		217.91.102.170      	192.168.40.1        	tcp dpt:22 # access to int. ssh server
    0     0 		ACCEPT     	tcp  --  *      *       		193.174.61.68        	192.168.40.1        	tcp dpt:22 # access to int. ssh server
    1    48 		ACCEPT     	tcp  --  *      *       		192.168.50.0/24      	82.100.242.70       	tcp spts:2000:65535 dpt:2000 


Chain USR_PRE (1 references)
 pkts bytes target     prot opt in     out     source	destination         
   19  1128 DNAT       tcp  --  *      *       0.0.0.0/0 	"external ip"       tcp dpt:22 to:192.168.40.1:22