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  1. #1
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    abu.tsaqif's Avatar
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    ini kok src-port.nya aneh ya ???

    Agan-agan Master Mikrotik , ane maw tanya nie..

    pic kaya gini normal ga yaw?? koq src-port kaya gitu??
    tadi sempet juga dst-port 50000.

    Click here to enlarge

    Mohon pencerahannya...Click here to enlargeClick here to enlarge

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    Normal banget tuh bos Click here to enlarge

    How NAT works

    A NAT firewall (or Internet Connection Sharing device) works like so:

    • Client, on the inside, using address 10.0.1.1:1234, wants to connect to server, on the outside, using address 20.0.2.2:2345, so client sends a packet to that address through the NAT box, which is the default gateway for the client.
    • Default gateway intercepts the packet, and notices that if it forwarded it to the outside, nobody would know where to return the packet, as 10.x.y.z is a special "private" range that has no meaning on the real internet. Instead, the gateway generously offers up its own address, 30.0.3.3, for the IP, and allocates a locally unused port, say 3456, for the source address. Thus, the packet that gets forwarded to server 20.0.2.2:2345 has a return address of 30.0.3.3:3456.
    • To be able to do the right thing with packets that come back from the server, the NAT box maintains a record that it used 30.0.3.3:3456 on behalf of the internal client 10.0.1.1:1234.
    • The server at 20.0.2.2:2345 receives a packet from a client claiming to live at 30.0.3.3:3456. The server does whatever it needs to do, and then returns a reply to 30.0.3.3:3456.
    • The reply hits the NAT box on port 3456. The NAT box looks up its internal records, and notices that this is really intended for the internal address 10.0.1.1:1234. It re-writes the destination address of the incoming packet and forwards the packet to the internal machine.
    • The internal machine sees a packet addressed to itself (10.0.1.1:1234) from the remote server (20.0.2.2:2345).
    • The server may repond from the same port that the client sent to (such as in this situation) or it may repond from some other port. Thus, most useful, working NAT boxes must not keep a table of where the inboun packets are supposed to be coming from; it is sufficient and necessary to only keep track of the local masqueraded addreses.


    source :

  3. #3
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    stlah ane googling kata.x port 50000 adalah port yg digunain oleh trojan.
    tpi, tak tau juga ane

  4. #4
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    cepukom's Avatar
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    memang begini cara kerja ip. dest port : fixed.
    sedangkan src-port random.
    ga ada yang aneh koq gan.

 

 

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