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Finding spoofed IP address on network

I have a few IP spoof dropped messages coming out of my Sonicwall firewall, we'll call them Source A and Source B. Both of these sources have the same mac address indicating they're coming from the ...
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161 views

Can a machine(physical or virtual) accept and process UDP packets with a different IP address coming from a known device?

Before everything, thanks for reading the next question. I have script,(ipUDPspoof.rb), which is a client/server script in Ruby (you choose the parameter 1 to be server and 0 to be client, at ...
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135 views

Cisco 871 IOS BVI: Distinguishing incoming and outgoing

I understand that a BVI is very much equivalent to a network switch. But it includes the benefit of being able to have an access control list. I am doing this, but I would like to more effectively ...
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471 views

What's the best way to block IP spoofing on a layer 3 switch?

We're hosting Dedicated Servers and are currently using old 3com switches with IP-based ACLs. So each port has an ACL that allows all IP addresses assigned to this customer, and blocks everything ...
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325 views

How to avoid sendmail relay domains spoofing

I have a bunch of domains as relay domains at my sendmail config, i noticed that some dirty botnet is using dns spoof to be able to send emails using those relay domains. How it works: a domain ...
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Whitelist Spoff “reply-to” email Exhcange 2010

We have a 3rd party which is now sending out emails to user@domain.com with the reply address set as otheruser@domain.com (instead of their own email server) and they are showing up in the inbox of ...