logging outbound traffic iptables











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I am pretty new to iptables and I make some exercices for myself to gain knowledge. Let assume the following scenario:



I have a gateway (internal IP=192.168.1.1, external IP=172.17.0.28, interface eth0) and I have a client in the subnet of the gateway (internal IP=192.168.1.2).



Now, I masqueraded the gateway that I have the possibility to use internet from the client over the gateway with the following nat table entry:
-A POSTROUTING -o eth0 -j MASQUERADE



My current target is to log all ICMP packets from client, which are routed over the gateway to the internet and all coming from the internet to the client. I want to log all "internet communication" from client over the gateway. How I can reach that?



My first approach was an entry by the gateway:
iptables -A FORWARD -i eth0 -d 192.168.1.2 -p icmp -j NFLOG
iptables -A FORWARD -d eth0 -s 192.168.1.2 -p icmp -j NFLOG



But that doesn't work. Could you give me a little hint what I miss by my thoughts?



Greetings






logging iptables







share|improve this question


























    up vote
    0
    down vote

    favorite












    I am pretty new to iptables and I make some exercices for myself to gain knowledge. Let assume the following scenario:



    I have a gateway (internal IP=192.168.1.1, external IP=172.17.0.28, interface eth0) and I have a client in the subnet of the gateway (internal IP=192.168.1.2).



    Now, I masqueraded the gateway that I have the possibility to use internet from the client over the gateway with the following nat table entry:
    -A POSTROUTING -o eth0 -j MASQUERADE



    My current target is to log all ICMP packets from client, which are routed over the gateway to the internet and all coming from the internet to the client. I want to log all "internet communication" from client over the gateway. How I can reach that?



    My first approach was an entry by the gateway:
    iptables -A FORWARD -i eth0 -d 192.168.1.2 -p icmp -j NFLOG
    iptables -A FORWARD -d eth0 -s 192.168.1.2 -p icmp -j NFLOG



    But that doesn't work. Could you give me a little hint what I miss by my thoughts?



    Greetings






    logging iptables







    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I am pretty new to iptables and I make some exercices for myself to gain knowledge. Let assume the following scenario:



      I have a gateway (internal IP=192.168.1.1, external IP=172.17.0.28, interface eth0) and I have a client in the subnet of the gateway (internal IP=192.168.1.2).



      Now, I masqueraded the gateway that I have the possibility to use internet from the client over the gateway with the following nat table entry:
      -A POSTROUTING -o eth0 -j MASQUERADE



      My current target is to log all ICMP packets from client, which are routed over the gateway to the internet and all coming from the internet to the client. I want to log all "internet communication" from client over the gateway. How I can reach that?



      My first approach was an entry by the gateway:
      iptables -A FORWARD -i eth0 -d 192.168.1.2 -p icmp -j NFLOG
      iptables -A FORWARD -d eth0 -s 192.168.1.2 -p icmp -j NFLOG



      But that doesn't work. Could you give me a little hint what I miss by my thoughts?



      Greetings






      logging iptables







      share|improve this question













      I am pretty new to iptables and I make some exercices for myself to gain knowledge. Let assume the following scenario:



      I have a gateway (internal IP=192.168.1.1, external IP=172.17.0.28, interface eth0) and I have a client in the subnet of the gateway (internal IP=192.168.1.2).



      Now, I masqueraded the gateway that I have the possibility to use internet from the client over the gateway with the following nat table entry:
      -A POSTROUTING -o eth0 -j MASQUERADE



      My current target is to log all ICMP packets from client, which are routed over the gateway to the internet and all coming from the internet to the client. I want to log all "internet communication" from client over the gateway. How I can reach that?



      My first approach was an entry by the gateway:
      iptables -A FORWARD -i eth0 -d 192.168.1.2 -p icmp -j NFLOG
      iptables -A FORWARD -d eth0 -s 192.168.1.2 -p icmp -j NFLOG



      But that doesn't work. Could you give me a little hint what I miss by my thoughts?



      Greetings






      logging iptables




      logging iptables






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 22 at 15:02









      user3461406

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