enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Internet checksum - Wikipedia

    en.wikipedia.org/wiki/Internet_checksum

    The Internet checksum, [1] [2] also called the IPv4 header checksum is a checksum used in version 4 of the Internet Protocol (IPv4) to detect corruption in the header of IPv4 packets. It is carried in the IP packet header, and represents the 16-bit result of summation of the header words. [3]

  3. IPv4 - Wikipedia

    en.wikipedia.org/wiki/IPv4

    Before sending a packet, the checksum is computed as the 16-bit ones' complement of the ones' complement sum of all 16-bit words in the header. This includes the Header Checksum field itself, which is set to zero during computation. The packet is sent with Header Checksum containing the resulting value. When a packet arrives at a router or its ...

  4. List of IP protocol numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_IP_protocol_numbers

    This is a list of the IP protocol numbers found in the field Protocol of the IPv4 header and the Next Header field of the IPv6 header. It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header. Both fields are eight bits wide.

  5. User Datagram Protocol - Wikipedia

    en.wikipedia.org/wiki/User_Datagram_Protocol

    When UDP runs over IPv4, the checksum is computed using a pseudo header that contains some of the same information from the real IPv4 header. [7]: 2 The pseudo header is not the real IPv4 header used to send an IP packet, it is used only for the checksum calculation. UDP checksum computation is optional for IPv4.

  6. Network address translation - Wikipedia

    en.wikipedia.org/wiki/Network_address_translation

    TCP and UDP, have a checksum that covers all the data they carry, as well as the TCP or UDP header, plus a pseudo-header that contains the source and destination IP addresses of the packet carrying the TCP or UDP header. For an originating NAT to pass TCP or UDP successfully, it must recompute the TCP or UDP header checksum based on the ...

  7. Checksum - Wikipedia

    en.wikipedia.org/wiki/Checksum

    The content of such spam may often vary in its details, which would render normal checksumming ineffective. By contrast, a "fuzzy checksum" reduces the body text to its characteristic minimum, then generates a checksum in the usual manner. This greatly increases the chances of slightly different spam emails producing the same checksum.

  8. Packet loss - Wikipedia

    en.wikipedia.org/wiki/Packet_loss

    Packets may also be dropped if the IPv4 header checksum or the Ethernet frame check sequence indicates the packet has been corrupted. Packet loss can also be caused by a packet drop attack . Wireless networks

  9. IP in IP - Wikipedia

    en.wikipedia.org/wiki/IP_in_IP

    This field indicates the transport layer protocol of the datagram following this header. The value is set to 4 for IP in IP. Not to be mistaken with value 4 in the Version field, which indicates IPv4. Header Checksum: 16 bits This field is the IP checksum of outer header. Source IP Address: 32 bits This field is the IP address of the encapsulator.