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What is the difference between stateful packet inspection firewalls and network address translation firewalls?
Wiki User
∙ 14y ago
These are two different things:
Stateful packet inspection is a firewalling technology where a record is kept of each session permitted through the firewall and then data is permitted back through if the sessions match up. (I am curently researching exactly *what* data is checked before a returned packet is permitted through.)
Network Address Translation (NAT) is more of a *routing* than firewalling technology (but I can't think of a network firewall that won't do this). This simply replaces either the source and/or destination IP network address with another IP address (NAT - it does what it says on the tin). The most common use of this is when a machine on a private IP address browses the internet: the router/firewall with a modem then replaces the source private IP with the public/internet IP address of the router. All other devices on the internet will know how to send traffic to and from the router without knowing anything about the setup of your private network/LAN. When the reply traffic arrives back at your router it knows which internal device sent traffic so can direct the traffic to the correct private IP address. This of course means (a) your private network is hidden and (b) the router does not know where to send traffic that hasn't originated from an internal device*... you could say it's firewalling.
*There are common exceptions to this: e.g. the router might do an opposite form of NAT where it knows that traffic to public IP 'a.b.c.d' goes to internal IP 192.168.x.y; I would say this is the second most common form of NAT.
Hope that helps.
Wiki User
∙ 14y ago
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How does a network firewall work?
Firewalls perform a simple form of "stateful inspection" of the packets that flow through them.
Which firewall feature is used to track communication channels and provides additional security for connectionless protocols?
Stateful Inspection. A stateful inspection firewall uses a technique known as stateful packet filtering to keep track of communication channels. This is different when compared to basic firewalls. Once the packet and connection has been sent, a normal firewall will not remember the communication channel, whereas the stateful inspection firewall will. This also proves useful to protect connectionless communication protocols.
Which router has the best hardware firewall?
All routers provide good hardware firewalls using stateful packet inspection (SPI), but Buffalo routers are excellent in this regard.
Which company manufactured stateful multi level firewalls?
cisco
What layer does stateful inspection work at?
Stateful inspection works at Network Layer . Many Thanks, Chinmoy Roy
Difference between juniper firewall and checkpoint firewall?
Difference between Checkpoint and Juniper Firewalls: Juniper follows two-tier architecture whereas Checkpoint follows three-tier architecture. Juniper uses the concept of Deep inspection process where as the checkpoint uses the stateful inspection process. Juniper uses the concept of Zones whereas Checkpoint do not use.
What is stateful inspection firewalls?
Stateful inspection firewalls monitor the state of active connections and use this information to determine which network packets to allow through the firewall. This is in contrast to static packet filtering where only the headers of packets are checked. Attackers can exploit this property of static filters to sometimes get information through the firewall by doing something like indicating "reply" in the header. Stateful inspection, on the other hand, analyzes packets all the way down to the application layer of the OSI model. Stateful inspection can monitor communications packets over a period of time and examine both incoming and outgoing packets. Outgoing packets that request specific types of incoming packets are tracked and only incoming packets that are proper responses are allowed through the firewall. In a firewall that uses stateful inspection, the network administrator can set the parameters to meet specific needs, for example ports can be closed unless an incoming packet requests connection to a specific port and then only that port is opened. This practice prevents port scanning, a well-known hacking technique.
Is there a difference between a Network hub and a router?
A network hub absconds with any stateful packet inspection (SPI), so it won't act as a firewall.
Can the Netgear bridges perform stateful packet inspection for all incoming traffic?
Yes it offers the staeful inspection.
What firewall operates at the highest level of the OSI m?
Stateful packet inspection
Is there a potential for a denial of service attack against a stateful firewall that would not occur in a stateless firewall?
Stateful firewalls use session-based rules to control traffic. The disadvantage of a stateful firewall is that it can be vulnerable to Denial of Service (DoS) attacks if a lot of new connections are opened very fast.
What are used in stateful inspection to enable the implementation of temporary rules?
dynamic state tables
