Table of Contents
- 1 What problems can a packet filtering firewall not prevent?
- 2 Can firewall stop IP spoofing?
- 3 What are the advantages and disadvantages of using packet filtering firewalls?
- 4 Why is a packet filtering firewall a stateless device?
- 5 How does SSL protect against IP spoofing?
- 6 How does ingress filtering work?
- 7 What does a stateful packet filtering do that stateless packet filtering does not do?
- 8 How does stateful packet filtering differ from basic packet filtering?
- 9 What is the best way to prevent spoofing?
- 10 Is IP address spoofing a threat to your security?
What problems can a packet filtering firewall not prevent?
Packet-filtering firewalls cannot prevent all types of attacks. For example, you might be allowing traffic to port 80 to a specific web server in your network. By doing this, the packet-filtering firewall is examining the destination address in the Layer 3 packet and the destination port number in the segment.
Can firewall stop IP spoofing?
Firewalls play a crucial part in blocking IP packets with spoofed addresses, and it is essential for all enterprise routers to be configured with the ability to reject packets with spoofed addresses.
How packet spoofing attacks can be prevented?
The options to protect against IP spoofing include monitoring networks for atypical activity, deploying packet filtering to detect inconsistencies (like outgoing packets with source IP addresses that don’t match those on the organization’s network), using robust verification methods (even among networked computers).
What are the advantages and disadvantages of using packet filtering firewalls?
PACKET-FILTERING FIREWALLS
| PACKET-FILTERING FIREWALLS | |
|---|---|
| Advantages | Disadvantages |
| – Fast and efficient for filtering headers.– Don’t use up a lot of resources.– Low cost. | – No payload check.– Vulnerable to IP spoofing.– Cannot filter application layer protocols.– No user authentication. |
Why is a packet filtering firewall a stateless device?
Why is a packet filtering firewall a stateless device? Without considering whether the packet is part of a valid and active session, it examines each packet and uses rules to accept or reject it. What types of filter criteria can an application layer gateway use for filtering?
Why packet filtering alone is inadequate as the only form of firewall?
A simple packet filter firewall might not necessarily be stateful, meaning it cannot look at the conversation not just the individual packets. In addition, these devices are not usually complex enough to deal with application (TCP/IP Layer 5) data and specifics.
How does SSL protect against IP spoofing?
Spoofing happens whenever an untrusted computer pretends to be a trusted computer or, in the case of a man-in-the-middle spoof, cannot be seen at all. The computer intercepts the communications, copies it and passes it along as if nothing happened. SSL stops this kind of attack by first encrypting all communication.
How does ingress filtering work?
How does ingress filtering work? Ingress filtering enables a network to allow only traffic from trusted sources to traverse their networks. So, traffic from a customer with prefix “x” will be allowed, while any other unrecognizable prefixes will not.
What is a packet filtering firewall used for?
Packet filtering is a firewall technique used to control network access by monitoring outgoing and incoming packets and allowing them to pass or halt based on the source and destination Internet Protocol (IP) addresses, protocols and ports.
What does a stateful packet filtering do that stateless packet filtering does not do?
Stateless firewalls are designed to protect networks based on static information such as source and destination. Whereas stateful firewalls filter packets based on the full context of a given network connection, stateless firewalls filter packets based on the individual packets themselves.
How does stateful packet filtering differ from basic packet filtering?
How does stateful packet filtering differ from basic packet filtering? – Stateful packet filtering looks only at each packet individually. – Stateful packet filtering looks at the packets in relation to other packets. – Stateful packet filtering looks at the destination address.
How does ingress filtering prevent IP spoofing?
This will prevent some of the possible exploits of IP spoofing. Ingress filtering prevents the reception of packets that are determined to be coming from a different IP address block than what is stated as the source in their header. When correctly implemented, this prevents attackers from flooding your system with requests.
What is the best way to prevent spoofing?
A very common defense against spoofing is ingress filtering, outlined in BCP38 (a Best Common Practice document). Ingress filtering is a form of packet filtering usually implemented on a network edge device which examines incoming IP packets and looks at their source headers.
Is IP address spoofing a threat to your security?
When in fact the reality is the opposite, IP Address Spoofing remains a real problem to defend against. In some cases, IP Address Spoofing is necessary for an attacks success, where it provides an additional layer of anonymity and protection for a botnet (see DNS DDoS Amplification Attack).
What is IPIP spoofing?
IP Spoofing is analogous to an attacker sending a package to someone with the wrong return address listed. If the person receiving the package wants to stop the sender from sending packages, blocking all packages from the bogus address will do little good, as the return address is easily changed.