Use $ _ SERVER [ quot; REMOTE_ADDR quot;] in PHP to obtain the IP address of the client. However, if the client is accessed by a proxy SERVER, the obtained IP address is the proxy server IP
IP Address | The client uses request.servervariables ("REMOTE_ADDR") in the ASP to obtain the IP address of the client, but if the client is using a proxy server to access it, the IP address
the host receives an ARP request or sends an answer, it puts the hardware address and IP of the requesting side into the ARP cache. This way, when the TCP connection is established, the answering side does not need to send ARP to resolve the IP.If you attempt to connect to a non-existent host, multiple ARP requests are made and an incomplete entry is saved in the ARP cache. There is a time-out retransmissi
browser ie:Request.Browser.Browser;client browser version number:request.browser.majorversion;//Client operating system:Request.Browser.Platform;Server IP:Request.ServerVariables.Get ("Local_addr"). ToString ();Server name:Request.ServerVariables.Get ("SERVER_NAME"). ToString ();If you want to learn more about ServerVariables, you can useforeach (String o in request.servervariables) {Response.Write (o+ "=" +request.servervariables[o]+ "}For those who understand the
the delegate ARP or ARP proxy (proxyarp ). In this way, the sender of the ARP request can be spoofed to assume that the vro is the target host. In fact, the target host is on the "other side" of the vro ". The vro function is equivalent to the proxy of the target host, which forwards the group from other hosts.
4. Free ARP gratuitousarp refers to the IP
As we all know, using Request in ASP. serverVariables ("REMOTE_ADDR") can obtain the client's IP address. However, if the client uses a proxy server for access, the obtained IP address is the proxy server's
paying attention to using IPv6 for a long time to overcome this problem.
In addition to reducing the required IPv4 address, because all hosts outside the private network monitor communication through a shared IP address, NAT also provides a hidden layer for the private network. NAT is different from a firewall or proxy
$ _ server ["remote_addr"] in PHP to obtain the IP address of the client. However, if the client is accessed by a proxy server, the IP address of the proxy server is obtained, instead of the real client
address, you can also directly specify the IP address, so that other people even if the address has been modified, can not be connected to the network. When restricting IP addresses, you can use the address binding method:
First
Use request. servervariables ("remote_addr") to obtain the IP address of the client, but if the client is accessed by the proxy server, the obtained IP address is the IP address of the
PHP: obtain the client IP address 1. REMOTE_ADDR: view the IP address of the user's computer on the current page
2. HTTP_X_FORWARDED_FOR: view the gateway of the user's computer on the current page
3. HTTP_CLIENT_IP: client ip address
understand. The php manual shows that it is a predetermined variable, while HTTP_x_FORWARDED_FOR finds some information on the Internet.
Use $ _ SERVER ["REMOTE_ADDR"] in PHP to obtain the IP address of the client. However, if the client is accessed by a proxy SERVER, the IP addre
. The php manual shows that it is a predetermined variable, while HTTP_x_FORWARDED_FOR finds some information on the Internet.
Use $ _ SERVER ["REMOTE_ADDR"] in PHP to obtain the IP address of the client. However, if the client is accessed by a proxy SERVER, the IP address o
using in ASPRequest.ServerVariables ("REMOTE_ADDR") to obtain the IP address of the client, but if the client is accessed using a proxy server, then the IP address of the proxy server is taken, not the real client
address can be expressed in a mix of decimal, octal, and hexadecimal values, which is equally valid. For example, 202.108.22.5 can be expressed as 0xCA. 108.0026.0x05, can further deformation http://www.readlog.cn @ 0xCA. 108.0026.0x05/, and the letters and symbols used for the path and file name after the IP address can be replaced by hexadecimal values, such a
MCT Maulik Patel from India provides a server-side IP retrieval Solution
If (context. Request. servervariables ["http_via"]! = NULL) // Using proxy{IP = context. Request. servervariables ["http_x_forwarded_for"]. tostring (); // return real client IP.}Else // not using proxy
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