Can anyone elaborate on NAT overload and related configurations

Solve the overload problem caused by NAT Internet access - viruses, BT and other P2P If the ISP assigns you multiple public IPs, for example, for fiber access users, you can generally assign 5 public networks, you can establish multiple address pool conversions, so that you can use QoS to do more detailed traffic control.

Start by determining the address of the internal host you want to translate.

Available internal global addresses.

Start configuring. conf t

access-list 1 permit

ip nat inside source list 1 int s0/0/0 overload

int s0/0/0

ip nat out

int s0/0/1

ip nat inside

Explanation: S0 0 0 refers to the external network interface, and S0 0 1 refers to the internal network interface. Then the access list is to divide the range of hosts you need to NAT to convert, implicitly deny any.

If there are still differences, please ask, welcome to join my team to learn together.

If the PC in the network segment can ping the PC in the Internet segment, then it proves that it can be accessed.

NAT - Network Address Translation is the IP address of internal management by converting a private network address (such as the intranet of the enterprise) into a public address (such as the Internet), so as to hide the IP address of internal management. In this way, by using non-registered IP addresses internally and converting them to a small number of externally registered IP addresses, the cost of IP address registration is reduced as well as the address space that is currently increasingly lacking (i.e., IPv4). At the same time, it also hides the internal network structure, thus reducing the risk of attacks on the internal network.

NAT functions are usually integrated into routers, firewalls, and separate NAT devices, and of course, most of the more popular operating systems or other software (mainly ** software, such as WinRoute) also have NAT functions. The NAT device (or software) maintains a status table that maps the private IP address of the internal network to the legitimate IP address of the external network. Each packet is translated into the correct IP address in the NAT device (or software) and sent to the next level.

Unlike ordinary routers, NAT devices actually modify the packet header to change the source address of the internal network to the NAT device's own external network address, while ordinary routers only read the source and destination addresses before sending the packet to the destination.

There are three types of nats: staticnat, poolednat, and port nat. Among them, static NAT permanently maps each host in the internal network to a legal address in the external network, while the NAT pool defines a series of legal addresses in the external network and maps them to the internal network using the method of dynamic allocation, and port NAT maps the internal address to different ports of an IP address in the external network.

You don't have a topology and IP address table, and ACL11 is not written.

**Rules inside the virtual server.

Look for the manuals of the router.

1. Open VMware and select , Virtual Network.

2. By default, VMware8 is the NIC used by our NAT, VMNet8 is selected.

3. Set our IP address here, this is specified casually, I set it here, and the subnet mask is default.

4. After that, click on NAT settings.

5. Here we can set the gateway address we want, I use the default here.

6. After all the settings are completed, we can click Confirm, and at this point, the NAT network configuration of VMWare is completed. Then let's test it specifically to see if it really connects with the host.

7. Let's open the run dialog box (if you don't know how to open it, press the windows logo + R key) and enter cmd.

8. Enter the ping test result, and we find that it is connected.

The steps to change the NAT type are as follows:

1. First open the browser, log in to the telecom optical modem, and enter the "ne7ja%5m" super password to log in.

2. Then click on the "Network Connection" option in the pop-up window to open the network.

3、Then find the 6 internet r vid 41 option in the pop-up window,The service is optical modem dial-up Internet access,We only need to modify fullconenat to hit it。

There are three ways to implement NAT, namely static nat, dynamic nat, and port multiplexing.

1. Static conversion refers to the conversion of the private IP address of the internal network into a public IP address, the IP address pair is one-to-one and immutable, and a private IP address is only converted to a public IP address. With the help of static conversion, the external network can access certain specific devices in the internal network, such as servers.

2. Dynamic conversion refers to the conversion of the private IP address of the internal network into a public IP address, the IP address is uncertain and random, and all the private IP addresses authorized to access the Internet can be randomly converted into any specified legal IP address.

That is, dynamic translation can occur as long as you specify which internal addresses can be translated, and which legitimate addresses can be used as external addresses. Dynamic transformations can use multiple sets of legitimate external addresses. When the legitimate IP address provided by the ISP is slightly less than the number of computers inside the network.

This can be done in the form of dynamic transformation.

3. Port address translation (PAT) refers to changing the source port of outgoing packets and performing port translation, that is, port address translation (PAT).Port multiplexing mode is adopted.

All hosts on the internal network can share a legitimate external IP address to achieve access to the Internet, so as to maximize the saving of IP address resources. At the same time, it can hide all hosts inside the network to effectively avoid attacks from the Internet. Therefore, port multiplexing is the most widely used method in the network.

In order for these applications to transparently complete NAT translations, NAT uses a technology called ALG, which can also perform NAT translations of the address information contained in the communication between these applications.

For example, the port pasv command for FTP and DNS"a"with"ptr"Queries commands and some ICMP message types need to be supported by corresponding algs.

If the protocol data packet does not contain address information, it is easy to use the traditional NAT technology to complete the transparent address translation function, and the following applications can directly use the traditional NAT technology: HTTP, Telnet, Finger, NTP, NFS, Archie, Rlogin, RSH, and RCP.

Hello, some can change the NAT type by changing the DNS, which depends on the router, and some routers do not support changing.

Dynamic NAT defines a pool of legitimate addresses, which are then mapped internally using a dynamic allocation method for dynamic one-to-one translation.

NAT Overload implements many-to-one mapping.

1.Write a list of NAT transformations such as:

IP nat inside source static maps the IP address of the internal network to the public IP address of the public network2Write the call on the router interface:

IP NAT Inside or IP NAT Outside