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When filtering, a check on traffic is conducted and the decision whether to let it into a protected network is made. It is just the means by which individual firewalls decide on non/safety of certain traffic that draws the line between them.

However, fundamental transfer mechanisms are arranged independently, regardless the processing of the previous request, which is the reason why the context between packets disappears.

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Older firewall versions control solely traffic source and its target. Target IP addresses and ports are controlled on the network level. Firewall thus blocks the traffic based on the fact from which node and/or network it is coming from.

So as to reveal the attack, the DoS must approach all other packets with awareness of the previous attack; it must, hinein a way, ‘remember’ its state which is why these firewalls are well-known as ‘stateful firewalls’.

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RouterOS firewall belongs to the category of stateful firewalls hence it can reveal packets that are not involved hinein the connection and are not reliable. MikroTik firewall filters IP addresses, Hafen protocols, network interfaces, source MAC addresses and TCP options (Transmission Control Protocol).

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Nonetheless, data for transfer are segmented into smaller parts, so-called packets, of which each and every one bears hinein itself only a piece of information about the character of the data. Hence a complete message is assembled rein the final destination, i.e. on the receiver’s parte; that is why the firewall investigating only the control information (otherwise source and target) can hardly discover whether or not does the message contain any threats.

Hidden threats are most efficiently revealed hinein the application layer, hinein which the packets might be read more inspected in more Konstituens, i.e. not only where they are coming from, but also where they are aiming to and what the character of the data, they are transferring, is. Firewall that inspects the packet in the application layer works in the application gate (proxy) and is able to estimate whether the packet is attempting to bypass the gate using protocol on the allowed port or whether it uses protocol for wrong purposes.