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Foward ports with iptables NAT rules?


Port Mirroring using iptables - copy all traffic among nginx on :80 and Apache on :8080iptables - Redirect web traffic to LAN ServerAlter DST port on bridged trafficFreeBSD load balancer implementationiptables rule to snat port and ip on AWS instanceiptables - 2 Internetprovider - routingImplicit Inverses for iptables NAT RulesLocal port forwarding using iptables is not workingDROP or REJECT packets from PREROUTING NAT table in iptablesPort forwarding over OpenVpn













0















I'm trying to forward ports with iptables NAT rules, but it doesn't seem to work.



Example picture



So I want traffic from NAT#1 in a specific port range go to a specific server in a server group and traffic from NAT#2 to another server group.



I have to use the "NAT server" 192.168.1.10 as SNAT otherwise the FW will drop the traffic.



I've tried the following on the "NAT server",



Example A - NAT#1 port 4000 to Server Group A

sudo iptables -t nat -A PREROUTING -p tcp -d 192.168.1.20 --dport 4000 -j DNAT --to-destination 192.168.1.100
sudo iptables -t nat -A POSTROUTING -s 192.168.1.100 -j SNAT --to 192.168.1.10

Example B - NAT#2 port 5000 to Server Group B

sudo iptables -t nat -A PREROUTING -p tcp -d 192.168.1.30 --dport 5000 -j DNAT --to-destination 192.168.1.201
sudo iptables -t nat -A POSTROUTING -s 192.168.1.201 -j SNAT --to 192.168.1.10


UPDATE




I have to use the "NAT server" 192.168.1.10 as SNAT otherwise the
FW will drop the traffic.




This works, kind of.



sudo firewall-cmd --permanent --zone=public --add-rich-rule='rule family=ipv4 destination address=192.168.1.20 forward-port port=4000-4010 protocol=tcp to-addr=192.168.1.100'
sudo firewall-cmd --permanent --zone=public --add-rich-rule='rule family=ipv4 destination address=192.168.1.30 forward-port port=4000-4010 protocol=tcp to-addr=192.168.1.200'
sudo firewall-cmd --reload


but not with one zone. As they write in RedHat firewall doc,



A rule is associated with a particular zone. A zone can have several rules. If some rules interact or contradict, the first rule that matches the packet applies.



So I have to use two zones. Is this possible with two aliases?!?



UPDATE



This worked...



firewall-cmd --permanent --direct --add-rule ipv4 nat PREROUTING 0 -p tcp -m tcp -d "nat_alias" --dport "ext_port" -j DNAT --to-destination "server_ip":"int_port"
firewall-cmd --permanent --direct --add-rule ipv4 filter FORWARD 0 -m state -p tcp -d "server_ip" --dport "int_port" --state NEW,ESTABLISHED,RELATED -j ACCEPT
firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -t nat -p tcp -m tcp -s "server_ip" --sport "int_port" -j SNAT --to-source "nat_ip"









share|improve this question




























    0















    I'm trying to forward ports with iptables NAT rules, but it doesn't seem to work.



    Example picture



    So I want traffic from NAT#1 in a specific port range go to a specific server in a server group and traffic from NAT#2 to another server group.



    I have to use the "NAT server" 192.168.1.10 as SNAT otherwise the FW will drop the traffic.



    I've tried the following on the "NAT server",



    Example A - NAT#1 port 4000 to Server Group A

    sudo iptables -t nat -A PREROUTING -p tcp -d 192.168.1.20 --dport 4000 -j DNAT --to-destination 192.168.1.100
    sudo iptables -t nat -A POSTROUTING -s 192.168.1.100 -j SNAT --to 192.168.1.10

    Example B - NAT#2 port 5000 to Server Group B

    sudo iptables -t nat -A PREROUTING -p tcp -d 192.168.1.30 --dport 5000 -j DNAT --to-destination 192.168.1.201
    sudo iptables -t nat -A POSTROUTING -s 192.168.1.201 -j SNAT --to 192.168.1.10


    UPDATE




    I have to use the "NAT server" 192.168.1.10 as SNAT otherwise the
    FW will drop the traffic.




    This works, kind of.



    sudo firewall-cmd --permanent --zone=public --add-rich-rule='rule family=ipv4 destination address=192.168.1.20 forward-port port=4000-4010 protocol=tcp to-addr=192.168.1.100'
    sudo firewall-cmd --permanent --zone=public --add-rich-rule='rule family=ipv4 destination address=192.168.1.30 forward-port port=4000-4010 protocol=tcp to-addr=192.168.1.200'
    sudo firewall-cmd --reload


    but not with one zone. As they write in RedHat firewall doc,



    A rule is associated with a particular zone. A zone can have several rules. If some rules interact or contradict, the first rule that matches the packet applies.



    So I have to use two zones. Is this possible with two aliases?!?



    UPDATE



    This worked...



    firewall-cmd --permanent --direct --add-rule ipv4 nat PREROUTING 0 -p tcp -m tcp -d "nat_alias" --dport "ext_port" -j DNAT --to-destination "server_ip":"int_port"
    firewall-cmd --permanent --direct --add-rule ipv4 filter FORWARD 0 -m state -p tcp -d "server_ip" --dport "int_port" --state NEW,ESTABLISHED,RELATED -j ACCEPT
    firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -t nat -p tcp -m tcp -s "server_ip" --sport "int_port" -j SNAT --to-source "nat_ip"









    share|improve this question


























      0












      0








      0








      I'm trying to forward ports with iptables NAT rules, but it doesn't seem to work.



      Example picture



      So I want traffic from NAT#1 in a specific port range go to a specific server in a server group and traffic from NAT#2 to another server group.



      I have to use the "NAT server" 192.168.1.10 as SNAT otherwise the FW will drop the traffic.



      I've tried the following on the "NAT server",



      Example A - NAT#1 port 4000 to Server Group A

      sudo iptables -t nat -A PREROUTING -p tcp -d 192.168.1.20 --dport 4000 -j DNAT --to-destination 192.168.1.100
      sudo iptables -t nat -A POSTROUTING -s 192.168.1.100 -j SNAT --to 192.168.1.10

      Example B - NAT#2 port 5000 to Server Group B

      sudo iptables -t nat -A PREROUTING -p tcp -d 192.168.1.30 --dport 5000 -j DNAT --to-destination 192.168.1.201
      sudo iptables -t nat -A POSTROUTING -s 192.168.1.201 -j SNAT --to 192.168.1.10


      UPDATE




      I have to use the "NAT server" 192.168.1.10 as SNAT otherwise the
      FW will drop the traffic.




      This works, kind of.



      sudo firewall-cmd --permanent --zone=public --add-rich-rule='rule family=ipv4 destination address=192.168.1.20 forward-port port=4000-4010 protocol=tcp to-addr=192.168.1.100'
      sudo firewall-cmd --permanent --zone=public --add-rich-rule='rule family=ipv4 destination address=192.168.1.30 forward-port port=4000-4010 protocol=tcp to-addr=192.168.1.200'
      sudo firewall-cmd --reload


      but not with one zone. As they write in RedHat firewall doc,



      A rule is associated with a particular zone. A zone can have several rules. If some rules interact or contradict, the first rule that matches the packet applies.



      So I have to use two zones. Is this possible with two aliases?!?



      UPDATE



      This worked...



      firewall-cmd --permanent --direct --add-rule ipv4 nat PREROUTING 0 -p tcp -m tcp -d "nat_alias" --dport "ext_port" -j DNAT --to-destination "server_ip":"int_port"
      firewall-cmd --permanent --direct --add-rule ipv4 filter FORWARD 0 -m state -p tcp -d "server_ip" --dport "int_port" --state NEW,ESTABLISHED,RELATED -j ACCEPT
      firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -t nat -p tcp -m tcp -s "server_ip" --sport "int_port" -j SNAT --to-source "nat_ip"









      share|improve this question
















      I'm trying to forward ports with iptables NAT rules, but it doesn't seem to work.



      Example picture



      So I want traffic from NAT#1 in a specific port range go to a specific server in a server group and traffic from NAT#2 to another server group.



      I have to use the "NAT server" 192.168.1.10 as SNAT otherwise the FW will drop the traffic.



      I've tried the following on the "NAT server",



      Example A - NAT#1 port 4000 to Server Group A

      sudo iptables -t nat -A PREROUTING -p tcp -d 192.168.1.20 --dport 4000 -j DNAT --to-destination 192.168.1.100
      sudo iptables -t nat -A POSTROUTING -s 192.168.1.100 -j SNAT --to 192.168.1.10

      Example B - NAT#2 port 5000 to Server Group B

      sudo iptables -t nat -A PREROUTING -p tcp -d 192.168.1.30 --dport 5000 -j DNAT --to-destination 192.168.1.201
      sudo iptables -t nat -A POSTROUTING -s 192.168.1.201 -j SNAT --to 192.168.1.10


      UPDATE




      I have to use the "NAT server" 192.168.1.10 as SNAT otherwise the
      FW will drop the traffic.




      This works, kind of.



      sudo firewall-cmd --permanent --zone=public --add-rich-rule='rule family=ipv4 destination address=192.168.1.20 forward-port port=4000-4010 protocol=tcp to-addr=192.168.1.100'
      sudo firewall-cmd --permanent --zone=public --add-rich-rule='rule family=ipv4 destination address=192.168.1.30 forward-port port=4000-4010 protocol=tcp to-addr=192.168.1.200'
      sudo firewall-cmd --reload


      but not with one zone. As they write in RedHat firewall doc,



      A rule is associated with a particular zone. A zone can have several rules. If some rules interact or contradict, the first rule that matches the packet applies.



      So I have to use two zones. Is this possible with two aliases?!?



      UPDATE



      This worked...



      firewall-cmd --permanent --direct --add-rule ipv4 nat PREROUTING 0 -p tcp -m tcp -d "nat_alias" --dport "ext_port" -j DNAT --to-destination "server_ip":"int_port"
      firewall-cmd --permanent --direct --add-rule ipv4 filter FORWARD 0 -m state -p tcp -d "server_ip" --dport "int_port" --state NEW,ESTABLISHED,RELATED -j ACCEPT
      firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -t nat -p tcp -m tcp -s "server_ip" --sport "int_port" -j SNAT --to-source "nat_ip"






      rhel iptables port-forwarding nat






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 14 mins ago









      Rui F Ribeiro

      41.3k1481140




      41.3k1481140










      asked Dec 13 '16 at 13:21









      BjosveBjosve

      162




      162




















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          You should do NAT/SNAT first after that you use NAT/SNAT ip address to forward port.Maybe you need to separate iptable rules.






          share|improve this answer






















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            You should do NAT/SNAT first after that you use NAT/SNAT ip address to forward port.Maybe you need to separate iptable rules.






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              You should do NAT/SNAT first after that you use NAT/SNAT ip address to forward port.Maybe you need to separate iptable rules.






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                You should do NAT/SNAT first after that you use NAT/SNAT ip address to forward port.Maybe you need to separate iptable rules.






                share|improve this answer













                You should do NAT/SNAT first after that you use NAT/SNAT ip address to forward port.Maybe you need to separate iptable rules.







                share|improve this answer












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                answered Dec 13 '16 at 15:13









                supriadysupriady

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