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6in4
6in4 is an IPv6 transition mechanism for migrating from Internet Protocol version 4 (IPv4) to IPv6. It is a tunneling protocol that encapsulates IPv6 packets on specially configured IPv4 links according to the specifications of . The IP protocol number for 6in4 is ''41'', per IANA reservation. The 6in4 packet format consists of the IPv6 packet preceded by an IPv4 packet header. Thus, the encapsulation overhead is the size of the IPv4 header of 20 bytes. On Ethernet with a maximum transmission unit (MTU) of 1500 bytes, IPv6 packets of 1480 bytes may therefore be transmitted without fragmentation. 6in4 tunneling is also referred to as ''proto-41 static'' because the endpoints are configured statically. Although 6in4 tunnels are generally manually configured, the utility AICCU can configure tunnel parameters automatically after retrieving information from a Tunnel Information and Control Protocol (TIC) server. The similarly named methods 6to4 or 6over4 describe a different mech ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AICCU
AICCU (Automatic IPv6 Connectivity Client Utility) was a popularSixXS Usage showing the number of tunnels of the SixXS service, most were using AICCU to set the tunnel up cross-platform utility for automatically configuring an . It is available under a . The utility was originally provided for the SixXS Tunnel Broker but it can also be us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IPv6 Transition Mechanism
An IPv6 transition mechanism is a technology that facilitates the transitioning of the Internet from the Internet Protocol version 4 (IPv4) infrastructure in use since 1983 to the successor addressing and routing system of Internet Protocol Version 6 (IPv6). As IPv4 and IPv6 networks are not directly interoperable, transition technologies are designed to permit hosts on either network type to communicate with any other host. To meet its technical criteria, IPv6 must have a straightforward transition plan from the current IPv4. The Internet Engineering Task Force (IETF) conducts working groups and discussions through the IETF Internet Drafts and Request for Comments processes to develop these transition technologies towards that goal. Some basic IPv6 transition mechanisms are defined in RFC 4213. Stateless IP/ICMP Translation Stateless IP/ ICMP Translation (SIIT) translates between the packet header formats in IPv6 and IPv4. The SIIT method defines a class of IPv6 addresses cal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DMZ (computing)
In computer security, a DMZ or demilitarized zone (sometimes referred to as a perimeter network or screened subnet) is a physical or logical subnetwork that contains and exposes an organization's external-facing services to an untrusted, usually larger, network such as the Internet. The purpose of a DMZ is to add an additional layer of security to an organization's local area network (LAN): an external network node can access only what is exposed in the DMZ, while the rest of the organization's network is protected behind a firewall. The DMZ functions as a small, isolated network positioned between the Internet and the private network. This is not to be confused with a DMZ host, a feature present in some home routers which frequently differs greatly from an ordinary DMZ. The name is from the term ''demilitarized zone'', an area between states in which military operations are not permitted. Rationale The DMZ is seen as not belonging to either network bordering it. This metaph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IP In IP
IP in IP is an IP tunneling protocol that encapsulates one IP packet in another IP packet. To encapsulate an IP packet in another IP packet, an outer header is added with Source IP, the entry point of the tunnel, and Destination IP, the exit point of the tunnel. While doing this, the inner packet is unmodified (except the TTL field, which is decremented). The Don't Fragment and the Type Of Service fields should be copied to the outer packet. If the packet size, including the outer header, is greater than the Path MTU, the encapsulator fragments the packet. The decapsulator will reassemble the packet. packet encapsulated in IP packet Outer IP header has the following fields: Version: 4 bitsThis field is the Protocol version number. It is always 4 as IP in IP is supported for IPv4 Header Length: 4 bits This field is the length of outer IP header Type of Service (TOS): 8 bits This field is copied from the inner IP header Total Length: 16 bits This field is the length of the en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IP Protocol Number
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. Protocol numbers are maintained and published by the Internet Assigned Numbers Authority (IANA). {, class="wikitable" , - ! Hex ! Protocol Number !! Keyword !! Protocol !! References/ RFC , - , 0x00 , 0 , HOPOPT , IPv6 Hop-by-Hop Option , , - , 0x01 , 1 , ICMP , Internet Control Message Protocol , , - , 0x02 , 2 , IGMP , Internet Group Management Protocol , , - , 0x03 , 3 , GGP , Gateway-to-Gateway Protocol , , - , 0x04 , 4 , IP-in-IP , IP in IP (encapsulation) , , - , 0x05 , 5 , ST , Internet Stream Protocol , , , - , 0x06 , 6 , TCP , Transmission Control Protocol , , - , 0x07 , 7 , CBT , Core-based trees , , - , 0x08 , 8 , EGP , ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
6to4
6to4 is an Internet transition mechanism for migrating from Internet Protocol version 4 (IPv4) to version 6 (IPv6) and a system that allows IPv6 packets to be transmitted over an IPv4 network (generally the IPv4 Internet) without the need to configure explicit tunnels. Special relay servers are also in place that allow 6to4 networks to communicate with native IPv6 networks. - Connection of IPv6 Domains via IPv4 Clouds 6to4 is especially relevant during the initial phases of deployment to full, native IPv6 connectivity, since IPv6 is not required on nodes between the host and the destination. However, it is intended only as a transition mechanism and is not meant to be used permanently. 6to4 may be used by an individual host, or by a local IPv6 network. When used by a host, it must have a global IPv4 address connected, and the host is responsible for encapsulation of outgoing IPv6 packets and decapsulation of incoming 6to4 packets. If the host is configured to forward packet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunneling Protocols
In computer networks, a tunneling protocol is a communication protocol which allows for the movement of data from one network to another. It involves allowing private network communications to be sent across a public network (such as the Internet) through a process called encapsulation. Because tunneling involves repackaging the traffic data into a different form, perhaps with encryption as standard, it can hide the nature of the traffic that is run through a tunnel. The tunneling protocol works by using the data portion of a packet (the payload) to carry the packets that actually provide the service. Tunneling uses a layered protocol model such as those of the OSI or TCP/IP protocol suite, but usually violates the layering when using the payload to carry a service not normally provided by the network. Typically, the delivery protocol operates at an equal or higher level in the layered model than the payload protocol. Uses A tunneling protocol may, for example, allow a forei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IPsec
In computing, Internet Protocol Security (IPsec) is a secure network protocol suite that authenticates and encrypts packets of data to provide secure encrypted communication between two computers over an Internet Protocol network. It is used in virtual private networks (VPNs). IPsec includes protocols for establishing mutual authentication between agents at the beginning of a session and negotiation of cryptographic keys to use during the session. IPsec can protect data flows between a pair of hosts (''host-to-host''), between a pair of security gateways (''network-to-network''), or between a security gateway and a host (''network-to-host''). IPsec uses cryptographic security services to protect communications over Internet Protocol (IP) networks. It supports network-level peer authentication, data origin authentication, data integrity, data confidentiality (encryption), and replay protection (protection from replay attacks). The initial IPv4 suite was developed with few s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Network Ingress Filtering
In computer networking, ingress filtering is a technique used to ensure that incoming packets are actually from the networks from which they claim to originate. This can be used as a countermeasure against various spoofing attacks where the attacker's packets contain fake IP addresses. Spoofing is often used in denial-of-service attacks, and mitigating these is a primary application of ingress filtering. Problem Networks receive packets from other networks. Normally a packet will contain the IP address of the computer that originally sent it. This allows devices in the receiving network to know where it came from, allowing a reply to be routed back (amongst other things), except when IP addresses are used through a proxy or a spoofed IP address, which does not pinpoint a specific user within that pool of users. A sender IP address can be faked ( spoofed), characterising a spoofing attack. This disguises the origin of packets sent, for example in a denial-of-service attack. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IP Address Spoofing
In computer networking, IP address spoofing or IP spoofing is the creation of Internet Protocol (IP) packets with a false source IP address, for the purpose of impersonating another computing system. Background The basic protocol for sending data over the Internet network and many other computer networks is the Internet Protocol (IP). The protocol specifies that each IP packet must have a header which contains (among other things) the IP address of the sender of the packet. The source IP address is normally the address that the packet was sent from, but the sender's address in the header can be altered, so that to the recipient it appears that the packet came from another source. The protocol requires the receiving computer to send back a response to the source IP address therefore spoofing is mainly used when the sender can anticipate the network response or does not care about the response. The source IP address provides only limited information about the sender. It may p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
6over4
6over4 is an IPv6 transition mechanism meant to transmit IPv6 packets between dual-stack nodes on top of a multicast-enabled IPv4 network. IPv4 is used as a virtual data link layer (''virtual Ethernet'') on which IPv6 can be run. How 6over4 works 6over4 defines a trivial method for generating a link-local IPv6 address from an IPv4 address, and a mechanism to perform Neighbor Discovery on top of IPv4. Link-local address generation Any host wishing to participate in 6over4 over a given IPv4 network can set up a virtual IPv6 network interface. The link-local address is determined as follows : * it starts with fe80:0000:0000:0000:0000:0000, or fe80:: for short, * the lower-order 32 bits to the binary value must be that of the IPv4 address of the host. For example, host 192.0.2.142 would use fe80:0000:0000:0000:0000:0000:c000:028e as its link-local IPv6 address (192.0.2.142 is c000028e in hexadecimal notation). A shortened notation would be fe80::c000:028e. Multicast Address Map ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
