IP Address Blocking

1
IP Address Blocking
2
Table of Contents

• IP
• IP Address
• IANA
• IANA IP Addresses
• The Way an IP Works

• IP Blocking
• The Way IP Blocking Works
• Factors that cause IP Blocking
• Conclusion

3
IP

• IP is the abbreviation for Internet Protocol. The
  format of packets (datagrams) as well as the
  addressing scheme are specified by it. Datagrams
  are relayed by it across network boundaries. IP
  delivers packets from the source host to the
  destination host according to the IP address that
  are in the packet headers.
• In most networks IP is combined with TCP
  (Transmission Control Protocol) which is a higher
  level protocol to establish a virtual connection
  between a destination and a source.

4

IP Address

• YELLOW
• An Internet Protocol (IP) address refers to an
  alphanumeric label. This label is assigned to
  computers and other electronic devices that use
  an internet protocol to connect to a network. The
  IP address enables these electronic devices to
  send as well as receive data via the Internet. A
  unique IP address exists for every such device
  that connects to the Internet.
• The two main functions of an IP address are-
• Identification of host or network interface
• Location addressing

5

IANA

• IANA is the abbreviation of Internet Assigned
  Numbers Authority. It is a standards organization
  which oversees global allocation of IP addresses
  as well as the allocation of autonomous system
  number. It is also responsible for overseeing the
  management of root zone in the DNS (Domain Name
  System), symbols that are related to other
  Internet Protocol and Internet numbers.

6
1-800-123 -8156

• Whoa! Thats a big number, arent you proud?

7

IANA IP Addresses

• YELLOW
• The allocation of IP address blocks are delegated
  by IANA to RIRs (Regional Internet Registries).
  An RIR is an organization which is responsible
  for managing Internet number resources
  allocation and registration within a particular
  region of the world. Hence, each RIR has the
  responsibility of allocating addresses to a
  different part of the world. The RIRs allocate
  addresses to ISPs (Internet service providers),
  companies and other institutions that are within
  their zone.
• The end user gets his IP address from an ISP or a
  company network which had received it from an
  RIR. An RIR had been allocated a block of
  addresses by the IANA. This sums up the entire
  process.

8
The Way an IP Works

• An IP is datagram-oriented and is a
  connectionless protocol. Since it is designed to
  function over a dynamic network, an IP must work
  without a central directory or monitor. It cant
  depend on specific links. The source IP address,
  the destination IP address and other data must
  exist in the header of each packet for its
  successful delivery.

9
IP Blocking

• IP blocking refers to a security mechanism that
  is used on either mail or web or any other
  Internet servers. It is meant to block
  connectivity with a particular IP address or many
  IP addresses which are hostile. It can be
  understood as a network services configuration
  by which requests are blocked that are from hosts
  with certain IP addresses. It is most commonly
  used to ensure protection against brute force
  attacks.

10
The Way IP Blocking Works

• When the IP addresses that need to be blocked are
  known, it simplifies the process related to IP
  blocking. Once the IP addresses block list is
  specified, a script that matches each incoming
  connection's IP address against the entries that
  are in the block list, could be easily expected.
  Every user with an IP address that isnt present
  on the block list is granted access to a website
  instantly. In the event that such an IP address
  is found which exists in the block list, the web
  server that is hosting that website, returns a
  message to the user regarding denial of access.
• Let us explain briefly what a web server is. A
  web server stores, processes and delivers web
  contents to its clients. It is usually provided
  by web hosting companies along with services and
  technologies that make a website accessible. The
  best web hosting companies are often referred to
  as the Best Windows Hosting Company or as the
  Best Linux Hosting Company or as the Top Cloud
  Hosting Company.

11
Factors that cause IP Blocking

• Too many or too frequent log in attempts- A time
  limit is imposed by most servers with regard to
  the number of log in attempts. There is a
  possibility of carrying out a brute-force attack
  against the server if the number of login
  attempts are not restricted.
• Incorrectly configured mail client- Ones
  web-based mail server provides brute-force
  protection. This acts when it detects too many
  unsuccessful login attempts that are frequent.
  This problem might have its origin in some issue
  that has to do with IMAP or POP3 configurations
  of ones email client.
• Use of incorrect credentials- An error in the
  stored login credentials can lead to an attempt
  to connect getting blocked.
• Malware-related activity- In the event that any
  malware-related activity is detected or ones
  mail server or if it has been flagged for sending
  numerous emails, then ones IP will automatically
  get added to a blacklist.
• Incorrectly configured FTP or SSH access- The
  login attempts to cPanel as well as to the mail
  server are screened by ones server. Moreover,
  ones server monitors FTP and SSH connections.
  The probability with regard to errors increases
  when logging in through an FTP client. This is
  because it requires more information than a
  regular web login. Even the SSH access
  configuration can be somewhat tricky.

12
Conclusion
IP Blocking is a security measure that is used to
block undesirable and/or harmful sites and hosts
from accessing the server or node in order to
prevent any harm being caused to the network or
individual devices.
13
Thanks!

• ANY QUESTIONS?

• You can find me at
• www.htshosting.org
• 
  support_at_htshosting.org