IP spoofing, also known as IP address forgery or a host file hijack, is a hijacking technique in which a cracker masquerades as a trusted host to conceal his identity, spoof a Web site, hijack browsers, or gain access to a network.

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Spoofing email From address

Providing all legal measures are taken care of, what are some of the ways someone can spoof an email "From" field address and actually get the email to the recipient without spam filters getting in ...
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Spoofed IPv4 and IPv6 addresses over the internet

I have a few questions regarding IPv4 and IPv6 spoofing. Might as well just list them to be concise: What's the usual routing policy for ISPs' routers in regards to spoofed source addresses? i.e. if ...
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How easy/difficult is it to spoof DNS? Are some scenarios safer/more risky than others?

Practically speaking, how easy difficult is it to spoof DNS? What scenarios are more risky than others? For example: A phishing email or twitter link that attracts users to click a hyperlink A ...
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Pages restricted to certain IPs, safe? [duplicate]

Possible Duplicate: In what scenarios is relying on source IP address as a security control acceptable/unacceptable? If a website has a page which only renders for certain IPs, is there ...
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Solaris: IP Spoofing Across Ethernet Ports

Given a Solaris machine with two network interfaces corresponding to the separate ethernet ports in the back. 0: 192.168.0.5/255.255.255.0 1: 192.168.1.5/255.255.255.0 with /etc/defaultrouter set ...
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What kind of nefarious deeds can IP address Spoofing be used for? [duplicate]

Possible Duplicate: What security risks does IP spoofing bring? I found this article, which seems pretty good but was written in 2003 so I'm not sure how up to date it is. Can IP address ...
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Can ipopts be used to circumvent a pf or iptables firewall source IP based blocking?

Can one use ipopts, and in particular IP source routing, to circumvent source-based blocking in pf or iptables? For example, with OpenBSD's pf: block in all # default deny block out all pass in on ...
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In what scenarios is relying on source IP address as a security control acceptable/unacceptable?

A number of questions on this site mention relying on source IP address as a control and in most of them it is dismissed as being unreliable. In what circumstances might using source IP address as a ...
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Verify a website user is behind corporate firewall?

We have a public ecommerce website hosted at our datacenter onsite. For people who are within the corporate firewall hitting the website I want to display profiling information about the request of ...
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IP Address spoofing?

According to: https://secure.wikimedia.org/wikipedia/en/wiki/IP_address_spoofing "this technique is mainly used when the attacker does not care about the response or the attacker has some way of ...
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IP Conflicts / Spoofing

Are there any products / os that behave differently when an duplicate IP address is detected. This may indicate an IP spoof ? Can TCP stack 'shutdown' or stop in order to protect itself ?
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Why is it difficult to catch “Anonymous” or “Lulzsec” (groups)?

I'm not security literate, and if I was, I probably wouldn't be asking this question. As a regular tech news follower, I'm really surprised by the outrage of Anonymous (hacker group), but as a ...
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What tools are available to identify which country a specific IP address is located in?

In trying to identify the country a user logs in from, or to block country ranges for whatever reason (for example regulatory requirements) what tools, whether online or offline, are available?
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Are there valid reasons for spoofing an address?

This is a corollary to the question Why don't ISPs filter on source address to prevent spoofing?. Are there valid reasons to spoof an address?
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Why don't ISPs filter on source address to prevent spoofing?

I'm under the impression that if all the ISPs were required to filter on the source IP address of all outbound packets, that spoofing would be reduced considerably. Are any ISPs implementing this ...
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How can a company reduce exposure to packet spoofing? What solution should exist, but doesn't?

I'd like to understand what anti-packet-spoofing technology exists (or should exist) to verify an inbound packet. Maybe this is as simple as a Cisco ACL, Firewall Rule, implemented at the network ...
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What security risks does IP spoofing bring?

By manipulating the TCP packet and changing the source address one is able to spoof the IP. As I understand it, you will not be able to set up a full handshake by doing this, as you will never receive ...