brazilian stainless steel jewelry wholesale What is the difference between PAT function and NAT function? Please talk about online engineers. thanks.
Please answer concisely and concisely
4 thoughts on “brazilian stainless steel jewelry wholesale What is the difference between PAT function and NAT function?”
Leave a Comment
You must be logged in to post a comment.
ruby imports jewelry wholesale English: Pat (
)
Chinese: Performance Acceleration Technology
The category: Motherboard chipset
"This technology is mainly used to improve the performance of the chipset. This technology simply puts on PAT's improvement of chipset performance is not achieved by overclocking processors, chipsets or memory. Instead, it uses technology that reduces the delay of the internal FSB and system memory. One option of BIOS, it also needs to use the chip itself. The 865 chipset series cannot achieve PAT. In fact, the 865-PE chipset has provided quite excellent performance, and the 875P chipset provides those users with higher demanding users. Additional performance. It is expected that the performance of the 875P chipset will be 2-5%higher than the performance of the 865 chipset under the same configuration. It should also be pointed out that the PAT mode can only be achieved in the case of 800MHz
FSB and dual-channel DDR400. What is
nat?
network address conversion
(nat)
is a
internet
engineering task group
ntask
Force, IETF)
standards are used to allow multiple
pc
(using special address segments, such as
10.x.x, 192.168. x.x, 172.x.x.x)
The address of a single, global routing
ipv4
Address. IPv4
is the main reason for regular deployment
nat
. Windows
xp
and
Windows
me
Use
nat, especially when you connect the broadband network through
dsl
or cable modem.
nat
R n (in deployment in
IPv6
)
Although it is very effective, it is a temporary solution after all. Asia and other parts of the world are relatively serious, and it has become a question that needs to be paid attention to in North America. This is why people have been paying attention to the use of
ipv6
Reduce the required
ipv4
address, because all hosts outside the dedicated network are used to monitor communication through a shared
ip
address, so
nat
It also provides a hidden layer for the dedicated network. NAT
is different from the firewall or proxy server, but it is indeed good for security.
wholesale steel body jewelry With the rapid development of Internet, the rich resources on the Internet have become huge attractive. Access to Internet and access Internet has become the most urgent need for the information industry today.
but this is limited by many IP addresses. First of all, many LAN have been running for many years before entering the Internet. There are many ready -made resources and applications on the LAN, but its IP address distribution does not meet the international standards of the Internet. Therefore Address, this is undoubtedly a time -consuming work; second, with the expansion of Internet development, its available IP address is getting less and less. It is not easy to apply for a new IP address at the ISP. This is not only a matter of cost, but the current standard IPv4 of the IP address. Of course, with the introduction of IPv6, this problem should be solved. But the upgrade from IPv4 to IPv6 can not be completed in a day or two.
nat (network address translation) can solve many headaches. It solves the problem: use internal addresses in the internal network, translate the internal address into a legal IP address through NAT, and use it on the Internet. The specific approach is to replace the address domain in the IP package with a legal IP address.
NAT function is usually integrated into the router, firewall, ISDN router or separate NAT device. NAT device maintains a state table to map illegal IP addresses to legal IP addresses. Each package is translated into the correct IP address in the NAT device to send to the next level, which means that the processor brings a certain burden. But this is insignificant for ordinary networks, unless there are many large networks of hosts.
The note is that NAT is not a safe guarantee solution. Essence This allows hackers to steal network information easily and endanger network security.
NAT has three types: static NAT (StaticNat), NAT pool (Poolednat) and port NAT (PAT). The static NAT settings are the simplest, and each host in the internal network is permanently mapped into a legal address in an external network. The NAT pool defines a series of legal addresses in the external network, and the dynamic distribution method is mapped to the internal network. PAT is mapped to different ports of an IP address of the external network. Depending on different needs, various NAT solutions are favorable and disadvantaged.
■ Use NAT pool
using the NAT pool, you can provide external access services from the unregistered address space, or you can access the external network from the internal network instead of You need to re -configure the IP address of each machine in the internal network. For example, internal test subnets based on NT IIS servers 192.168.0.0, its network address belongs to Class B reserved address. As a subnet of the corporate network, its IP address is not assigned to the device on the enterprise network and is only limited to the test subnet device. In order to enable the enterprise network to access this internal network, add a static path to the network so that the information can be passed back to the Cisco4700 router. The router can connect the internal network and the corporate network to enable it to access each other. Do not use the RIP protocol in the internal network, because after using RIP, the internal network becomes more visible.
. This way, local information can be accessed with each other, but because 192.168.0.0 is a reserved address, it cannot be directly accessible to the Internet. So set a NAT pool in the router to translate the IP package from the internal network and map its IP address into a legal IP address in the address pool (). Then, the internal network can access any server on the Internet, and any host on the Internet can also access the internal network via TCP or UDP.
Then Nat pool means that many internal users can be defined in the internal network. Through the dynamic distribution method, a few external IP addresses can be shared. The static NAT can only form a corresponding fixed mapping method. It should be noted that after all the external IP addresses in the NAT pool are occupied, the subsequent NAT translation application will fail. Fortunately, many NAT -function routers have timeout configuration functions. For example, the current NAT process is deleted 15 minutes in the above CISCO4700 to start the current NAT process, and the subsequent NAT application reserves an external IP address. The test shows that the general external connection will not be very long, so the short time threshold can be acceptable. Of course, users can adjust the time threshold to meet their own needs.
Nat pool provides a lot of flexibility, but also affects some of the original management functions of the network. For example, the SN · MP management station uses an IP address to track the operation of the device. But after using NAT, it means that the internal address corresponding to those translated addresses is changed. Today, a workstation may be corresponding, and a server may be corresponding tomorrow. This has caused trouble for SNMP management. A feasible solution is to mark the address of the dividing to the NAT pool on the SNMP management platform. For the address that does not respond to the management signal, it will not be alarmed, just like they are turned off.
■ Pat
Pat has a large number of applications in remote access products, especially in the device used by remote dial -up users. PAT can map the internal TCP / IP to multiple ports of one registered IP address. PAT can support the connection to 64,500 TCP / IP, UDP / IP, but the number of workstations that can be supported will be less. Because many Internet applications, such as HTTP, are actually composed of many small connections.
Is using PAT in the Internet, all different TCP and UDP information streams seem to be derived from the same IP address. This advantage is very practical in the small office (SOHO). By applying for an IP address from the ISP, multiple connections are connected to the Internet via PAT. In fact, many SOHO remote access devices support PPP -based dynamic IP addresses. In this way, ISP does not even need to support PAT, and you can achieve multiple internal IP addresses to share the Internet on an external IP address. Although this will lead to certain congestion of the channel, considering the cost of ISP Internet access and easy management, PAT is still worth it.
■ NAT -based load balancing
This above is about using NAT and PAT to convert internal IP addresses into external legal IP addresses. Here is another use of NAT: as a substitute for DNSRound -Robin for load balance. The DNS series server solves the problem of multiple IP addresses to share a domain name. It jumps to find available IP addresses when responding to DNS applications. The effect is that one domain name can correspond to multiple IP addresses. This function can be applied to a HTTP server group, using it to balance the load of multiple servers. But there is another problem here. The IP client will buffer the DNS / IP address analysis locally, so that its subsequent applications will reach the same IP address and weaken the role of the DNS series server.
It using a NAT -based load balance scheme can avoid this problem. The router or other NAT devices translate multiple IP addresses that need to be balanced into a public IP address. Each TCP connection is sent to a IP address by NAT, while the subsequent TCP connection is sent to the next IP address by NAT. Realize the load balance. Of course, NAT -based load balances can only be implemented on NAT, and cannot be implemented on PAT.
■ Safety Questions
Is when NAT changes the IP address of the package, you need to carefully consider the impact on the safety facilities.
For the firewall, it uses IP address, TCP port, target address, and other information in IP packages to determine whether to interfere with the connection of the network. When NAT is used, the rules of the firewall may be changed because NAT changes the source and destination address.
In many configurations, NAT is integrated in the firewall system, providing the function of access control and address translation. Don't set NAT outside the firewall, because hackers can easily deceive NAT, so that NAT thinks it is an authorized user to enter the Internet.
. If the VPN (virtual special network) is used in the enterprise network, and IPSEC is used for encryption security guarantee, then the NAT is wrongly set to destroy the function of VPN. Put NAT inside the protected VPN instead of in the middle. Because NAT changes the address domain in the IP package, IPSEC stipulates that some information cannot be changed. If the IP address is changed, IPSEC will think that this package is forged and refuses to use it.
. Although NAT brings many superiority, for example, the existing network does not need to re -address, reduce the ISP access fee, and play a balance of load. Management functions and safety facilities require it to be used with caution.
wholesale jewelry account NAT's address conversion refers to the way each intranet address is converted into an IP address source port, which requires multiple IP addresses in the public network.
and PAT will appear in the form of the internal network address to be converted into an IP address port segment due to the insufficient IP address. Such a public network IP address is usually only one.
For example:
nat
192.168.0.2: 4444
----> 202.116.100.5: 444 R N192.168.0.3:5555 R n ----> 202.116.100.6:5555 R N192.168.0.10:1233 R N ---> 202.116.100.5: 1233
pat
192.168.0.2: 4444 r
----> 202.116.100.5:5003 R N192.168.0.3:555 R N ----> 202.116.100.5:50004R N192.168.0.10:123 r n- -> 202.116.100.5:50005
gemstones jewelry wholesale NAT's address conversion refers to the way each intranet address is converted into an IP address source port, which requires multiple IP addresses in the public network. Due to the insufficient IP address, the internal network address will appear in the form of the IP address port segment. Such a public network IP address is usually only one.