A, broadband router DNS has been maliciously tampered with how to do

What is DNS tampered with

DNS maps domain names to IP addresses and is the cornerstone of the Internet. Because DNS is so important, any attempt to change your DNS Settings without explicitly telling you what IP address you want to change your DNS to and asking for your consent is considered DNS tampering. If your DNS is tampered with, then your network is not secure at all.

Tools/materials

Secure, free DNS service address: 114.114.114.114 (or 114.114.115.115)

Anti-dns tamper tool Router password repair tool.

Methods/steps

1, manually change the DNS address of the local PC:

Windows XP Modification Method: Start -- Control Panel -- Network Connection -- Local Connection -- Properties -- Internet Protocol (TCP/IP) -- Properties Now we can see the default Settings.

Vista modification methods: start -- -- -- -- -- control panel -- -- -- -- -- - network and sharing center -- -- -- -- -- Local connection state of the view behind the attributes -- -- -- -- -- -- -- -- -- -- -- -- -- - Internet protocol (TCP/IPv4) 4 -- -- -- -- -- -- -- -- properties Then you can see.

DNS as shown in the red box is set to 114.114.114.114 (standby DNS: 114.114.115.115).

2. Use a dedicated DNS repair tool

First download Tencent Computer Manager and use DNS Preferred in its toolbox to select DNS.

Then choose Tencent computer housekeeper - antivirus, you can check Trojan horse and virus.

Stubborn Trojans in the toolbox can also help you deal with stubborn trojans. (This step is optional, just in case)

3. Check whether the router password is too simple.

If the password of your router is set simply, the DNS may be maliciously tampered. You are advised to use a repair tool to repair the DNS.

4, secure Internet protection software, prevent other tampering DNS Trojan again "patronize".

2. How to set the DHCP server for the router

Summary of the DHCP

DHCP is the Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol). It aims to reduce the burden of planning, managing, and maintaining TCP/IP networks and solve the problem of insufficient IP address space. This network service facilitates the effective management of client IP addresses in the network.

The DHCP function is divided into two parts: the server and the Client (the Client is not required to be installed, and the DHCP Client service is enabled by default in Windows 9X, 2000, or XP). DHCP effectively and dynamically allocates TCP/IP Settings to clients through the concept of lease. Below, we will combine tL-R410, the broadband router of TP-Link, to specify the functions of DHCP server.

DHCP its predecessor is BOOTP. BOOTP was originally intended for networks with disk-free hosts: network hosts started and connected to the network using the BOOT ROM instead of disk, and BOOTP automatically configured the TCP/IP environment for those hosts. BOOTP has a disadvantage, however: you must obtain the hardware address of the client before setting it up, and the correspondence to IP is static. In other words, BOOTP is very undynamic, and one-to-one BOOTP can be very wasteful in an environment with limited IP resources.

DHCP is an enhanced version of BOOTP. It has two parts: one for the server and one for the client. All IP network configuration data is centrally managed by the DHCP server, which processes the DHCP requirements of clients. The client uses the IP environment data assigned from the server. In contrast to BOOTP, DHCP effectively and dynamically allocates TCP/IP Settings to clients through a "lease" concept, and fully accommodates the needs of BOOTP clients for compatibility purposes. DHCP allocation Mode First, at least one DHCP server must be working on the network. The DHCP server listens for DHCP requests on the network and negotiates with clients on the TCP/IP setting environment.

How do I configure the DHCP server

At present, many broadband routers have the function of setting up DHCP servers. Tl-410, launched by TP-Link, is a small and stylish broadband router for home users. And the price is cheap, very suitable for the use of family users and students. The TL-R410 broadband router also has the function of supporting DHCP server, with manual allocation (static IP address allocation) and dynamic allocation. Let's briefly introduce how to use TL-R410 broadband router of TP-Link as an example to set the function of DHCP server.

Broadband router DNS has been maliciously tampered how to do?

Enter the router Settings screen and select DHCP server. You can see three sub-files: DHCP function, client list and static address assignment. If you select DHCP, the following Settings screen will be displayed:

Select enable DHCP server first (as shown above) so that you can take advantage of automatic address assignment. Address pool Start ADDRESS: the start IP address automatically assigned by the DHCP server. End IP address: indicates the end IP address automatically assigned by the DHCP server. Gateway: This parameter is optional. You are advised to enter the IP address of the LAN port on the router. The default IP address is 192.168.1.1. Default domain name: This parameter is optional. Enter the local domain name. Active DNS server: Optional. Enter the DNS server provided by your ISP. If you do not know, you can ask your ISP. Alternate DNS server: Optional. If your ISP provides you with two DNS servers, you can enter the IP address of the other DNS server here.

Note: In order to use the DHCP server function of this router, the TCP/IP protocol of each computer in the LAN must be set to automatically obtain an IP address. This function takes effect only after the router is restarted.

Select the client list to view the information about the client hosts that connect to the Internet through the router on the LOCAL area network (LAN), including the client host name, MAC address, ASSIGNED IP address, and remaining lease. From the figure below we can see that there are three hosts connected to the Internet through this router.

Lease is an important concept. When a client uses dynamic address allocation, the DHCP server dynamically assigns IP addresses to the client. However, the ALLOCATED IP addresses are not always used by a client. If the client does not apply for an extension of the lease, the DHCP server takes back the IP address. The remaining lease is the remaining time for the DHCP server to take back the IP address. Therefore, the client applies to the CHCP server for an extension of the lease before the lease expires (for example, when the lease is left). Of course, when the client is no longer using the IP address, the DHCP server will notify the CLIENT to reclaim the IP address, and then the IP address can be allocated to other clients.

Using TL-R410, you can also set the static address assignment function of the DHCP server. Select static address assignment and the following Settings screen appears.

As shown in the figure above, you can statically assign IP addresses to hosts if you know the MAC address of the host. The ROUTER's DHCP server function is now fully set up. On each host on the network, you only need to set the TCP/IP option to Automatically obtain an IP address. This function takes effect only after the router is restarted. Avoid the tedious TCP/IP setup for each host.

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