of DDNS allows enterprises to use dynamic IP addresses. Even if ADSL is used to obtain Dynamic IP addresses, users can access the server by memorizing domain names. Qno xiaonuo also introduced the dynamic domain name DDNS service to enterprise users. The test is currently underway and will be available to Qno xiaonuo users in the near future. Please wait and see.The following describes the configurations o
-lease-time (unit: seconds by default ):
The user's computer requires a lease time of a specific length. However, if the user does not require a lease time in particular, this is the default lease time.
Max-lease-time:
This setting value is the maximum lease time that the user can require. That is to say, if the lease time required by the user exceeds the set value, the value prevails;
Option domain-name "domain name ":
If you set a search google.com in/etc/resolv. conf, this means that when y
, traffic monitoring, and network address translation.Another, the benefit of transferring the DHCP service to a dedicated server, later on, is that it can establish a dynamic Domain name server (DDNS) so that when the host requests a DHCP address from the server, the host name of the new host is added to the DNS system.Installing and configuring the ISCDHCP server1. Use the APT tool to install the ISC software in the Debian repository to create this
startup, you need to set up a static address assignment in the DHCP server, that is, 50-e5-60-ca-1a-4a statically assign 192.168.1.250 this IP address for MAC address, and never expire.
vi. using Dynamic DNS features
Use dynamic DNS on routers so that you can use a domain name to access without having to view frequently changing public-network IP (ADSL dial-up IP is often changed). At the same time, allowing routers to do unwarranted web management is convenient when we can check the state of
current extranet address is the address of the VPN server. If your external network is using dynamic IP, you need to set up DDNS (dynamic Domain name resolution Service).
If your external network is using dynamic IP, you need to set up DDNS (dynamic Domain name resolution Service).
DDNS can bind any transformed IP address to a fixed level two domai
, is the napt to penetrate, mainly for the UDP protocol. TCP protocols are also possible, but the feasibility is very small and requires a higher demand. Moreover, the Voice video communication is transmitted by UDP, so the NAT penetration for TCP is not discussed here. The underlying NAT does not modify the port number of the packets that are passed, and they can be viewed as a condensed version of a fully conical NAT, which can also be penetrated by the underlying NAT. The NAT device will turn
The advantage of cable network monitoring is low transmission cost, large network bandwidth and good transmission effect, but it can't realize the monitoring demand of mobile industry. 3G Wireless monitoring advantage is to realize the mobile audio and video monitoring, easy to temporary monitoring, but high transmission costs, low network bandwidth, transmission effects are affected by a variety of factors.
In the field of networked monitoring, cable network monitoring accounted for 10% of 90%
preview to reduce the code rate, and do not affect the local video proposed dual-stream technology, that is, one video into the DVR, DVR can encode to provide two kinds of code stream, main stream and sub- The main stream resolution is higher than the sub-code stream, the main stream is used for video recording, the sub-stream is used for network transmission, the default client access using the main code
To configure the DHCP server using DHCP in RHEL5.4, follow these steps: 1. install DHCP Server software check whether dhcprpm-qdhcpmount/dev/cdrom/mediarpm-ivh/media/Server/dhcp-3.0.5-21.el5.i386.rpm2, modify the DHCP master configuration file is: /etc/dhcpd. to configure the DHCP server using DHCP in RHEL5.4, follow these steps:
1. install DHCP server software
Check whether dhcp is installed
Rpm-q dhcp
Mount/dev/cdrom/media
Rpm-ivh/media/Server/dhcp-3.0.5-21.el5.i386.rpm
2. modify the DHCP
Basically, it's a tough job. Because DDNS scripts often encounter network crawling failures when capturing Internet IP addresses from the Internet, they write such scripts and directly capture them from the TP-Link page, the success rate is basically 100% ~ There are two versions, one for the old TP-Link router (the IP address is directly written on the page, although
Basically, it's a tough job. Because DDNS
We know that no matter how the WAN interface IP address of the youxun router changes after DDNS is configured, Internet users only need to remember our dynamic domain name and can log on to our Intranet server at any time. The configuration method is as follows:1. youxun router advanced settings → DDNS, fill in the account and password of the requested peanut shell, and click to execute2. youxun router pean
serve external users, so that you do not need to set up a DNS server outside of the control, this improves security. Of course, you can also enable DNS Resolvers to be used by both internal and external users.
5. Protect DNS from cache pollution
DNS Cache pollution has become a common problem. Most DNS servers can store DNS query results in the cache before they reply to the requesting host. DNS high-speed cache can greatly improve the DNS query performance within your organization. The problem
-4.1.1/DHCPD. conf. Sample/etc/DHCP/DHCPD. conf
The DHCPD. conf file contains two parts: global configuration and local configuration:
1. When global configuration conflicts with local configuration, local configuration has a higher priority.
2. Each line in the configuration file must end with a semicolon, because no error is reported when DHCPD is started. You can only check the log file/var/log/message to see if the configuration file is faulty.
3. Local configuration must be included
I used to assign a private server to the rhct Model Tester. Haha, that's good. Now I have taken the CE test again. In fact, it is almost the same. I have already completed the configuration. Now I have time to summarize it.
A few days ago, I tried to copy the private server with Chong GE. It was too big. No copies.
In fact, the most important thing in the server is DHCP, DNS and an NIS server. Nothing else. It's quite simple to just meet functional requirements. I just need to configure it.
DHC
The simplest DHCP Service and the simplest DHCP Service
In the past few days, you have prepared to install the linux operating system on the network. Finally, we decided to use pxe + kickstart. After the principles and solutions are completed, the system starts construction and the result is blocked by DHCP. This does not require research on the simplest and most practical DHCP use methods.
* Red is required
* Note that green
* The Blue is the required package for package installation.
1. DHCP
I. Application introductionOur router is embedded with a peanut shell client. After logging on to the peanut shell domain name on the router, we can dynamically associate the WAN port IP address of the router with the IP address of the peanut shell domain name. If you need to access the server under the vro through the Internet, you can use this domain name to access the intranet server by setting the virtual server on the vro and logging on to the peanut shell domain name, you do not need to ca
through the router Win2003 server, and the server has installed a variety of services, such as Web sites, Remote Desktop control, routing management.
2, there is a common computer, the normal access to the line.
3, have a peanut shell account. and set the DDNS. (specifically how to set this section does not speak)
Second, enter the routing setup1, forwarding rules-Virtual server-Add new entries
> Using interfaces, the default is generally
allow DNS parsers to be used by both internal and external users.
5. Protect DNS from cache contamination
DNS cache contamination has become an increasingly common problem. Most DNS servers are able to store DNS query results in the cache before replying to the requesting host. DNS caching can greatly improve DNS query performance within your organization. The problem is that if your DNS server's cache is "contaminated" with a lot of fake DNS information, users may be sent to a malicious site
Cloud Router Tpddns use step one, enter the Setup interface
Tpddns is a dynamic domain name resolution service, you can change the IP address and fixed domain name corresponding. Because the router WAN port IP is dynamically changing (for example, under broadband dialing), if the login tpddns, then only need to use the domain name to access the server under the router, regardless of the dynamic change of IP address.
This article describes how to use Tpdds.
Login Router Management interface, c
Tenda Wireless Router Overview quote parameters and User comments:
Tengda TWL541R high-speed wireless Broadband router Set wireless AP, router, 4-port switches, firewalls in one. It is the best choice for home, office and Enterprise to share the Internet. The main features of this wireless broadband router are as follows:
High security: Support WPA authentication mode, built-in firewall, effective control network attack
High penetrating force: higher penetration than normal 11b and 11g, great
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