DHCP Attacks

DHCP attacks centre on two methods

1. Denial of service
2. DHCP impersonation

Denial of Service Attacks

• Address starvation with MAC flooding

Attack

1. DHCP servers have a limited number of addresses that they can give out.
2. DHCP scopes commonly have less than 200 addresses that they give out to hosts (the rest of the space is often reserved for static IP devices, such as servers, printers, etc).
3. An attacker has to do is send DHCP requests using random MAC addresses.
   
4. It keeps sending requests until the DHCP server stops responding. Of course, the DHCP has no idea what's going on, so it keeps responding to all the requests it sees coming in.
   

Mitigation

1. Mitigation of this attack is very simple with a Cisco switch.
2. Using a feature called port security.
3. Port security does is limit the number of MAC addresses a client machine can use.
4. Port security is supported on Cisco 2950's and above. The switch clears the MAC address associated with a port when the link goes down

Bye Bye Exams

I 've just finished my exams and i did not return to CPP
I will start working in my graduation project
you can know every thing about my project Watchdog

Very Lucky

I am very happy to start my posts at this day.
This Day:

1. My loyal friend Abbas told me that Mr:Nikesh Arora (President, EMEA Operations & Vice President, Google Inc) visits egypt and decide to open a new branch in egypt
   
2. When I and Abbas know that we wish to work in this big company Allah help us
   
3. I start to study natural language processing it has a very big relation with Google engine

But i have another bad news i am very annoyed because i have an exam and i can't study or understand any thing about this course , but i decide to execute our faculty protocol CPP (Copy Paste Protocol).

CPP is not Internet Protocol, it is a protocol for my faculty students.
CPP Steps:
When you don't know any thing about the course and have an exam you must do

1. search for Sheets solutions and pervious exams.
2. Copy solutions on your mind.
3. Paste it in exam.