Questions tagged [spoofing]

Spoofing is an activity when a person or program try to impersonates itself as another.

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65
votes
15answers
13k views

Are IP addresses “trivial to forge”?

I was reading through some of the notes on Google's new public DNS service: Performance Benefits Security Benefits I noticed under the security section this paragraph: Until a standard system-...
1
vote
1answer
1k views

Practical way to implement prevention of IP Spoofing

I am an undergraduate Computer Science student and was hoping to gain some knowledge of ways to help prevent IP spoofing but all the resources I have tried out elaborate this concept in a theoretical ...
7
votes
1answer
6k views

Does postfix reject spoofed senders?

Is there a reliable way to reject incoming mails with a spoofed e-mail address? What kind of checks does postfix run normally on incoming mails? does postfix check the reverse dns by default? does ...
2
votes
2answers
1k views

Linux-KVM / iptables: prevent guest spoofing by matching ip+mac address on bridge?

I have my KVM guests on a standard br0 bridge setup: auto br0 iface br0 inet static address 192.168.1.117 netmask 255.255.255.0 network 192.168.1.1 broadcast 192.168.1.225 gateway 192....
5
votes
1answer
15k views

How can I prevent spoofed emails from outside thats using my internal accepted domain

I'm receiving spam emails sent from my own domain to my own domain. I'm using Exchange 2013. Example: myemail@mydomain.com is being used to send spam to myemail@mydomain.com. I can successfully ...
3
votes
2answers
3k views

Stop spoof emails in Google Apps

Desperately need some help here. I've been using Google Apps for my domain (2qubed.co.uk) for over 2 years now with no problems at all until recently. For the past few months I have been getting lots ...
2
votes
1answer
63 views

Rewrite email (RFC822) From address to match MAIL FROM (RFC821) envelope address postfix

I'm taking steps to harden my outgoing postfix SMTP server. I want to prevent users from spoofing their sender address. When sending email with postfix SMTP the sender is identified in three ways: ...