vpn icmp

The old version of the VPN system GETSHELL of wangshen (also affects multiple VPN manufacturers' devices, such as Wangyu Shenzhou, tianrongxin, Xi'an wangying, weishitong, Geda zhengyuan, American concave and convex, and ANIX in Germany) In the/admin/system/backup_action.php file if (isset($_REQUEST['cmd']))$cmd = $_REQUEST['cmd'];else$cmd = "NULL";$with_cert = 1;$pass = "";include_once "management/system.p

1. The following is an example of an Android phone, we click "Settings" to enter, as shown in the following figure. 2. There is a more or more network connection in the Setup interface, which has the following interface 3. After this enter the interface, we click on "VPN" to open the new interface click "+" increase, as shown in the following figure. 4. Then we enter the domain name of the Outland, such as image encryption 5. Now back to t

Scenario Description: Currently testing on windows, or testing on Linux, send UDP packets, although the destination port is unreachable, but did not return the ICMP message destination port unreachable situation, really do the UDP message delivery characteristics, there is no waiting, Although the Connect function is called, it has no effect, but we can imagine that the three-time handshake of TCP is the ConnectThe result of the function, but UDP call

ICMP Port unreachable authentication. 1. Preparationwindow to download the TFTP32 software and set the IP address of the server (window system IP ), and shut down windows firewall. As shown in the following:2,Ubuntu virtual machine, install tftp service, and install wireshark.sudo apt-get install TFTP3.Open Wireshark.Start the TFTP service and connect to window, Specify the 8000 port, this port number is not process in use , when need get file, Even

1. Code2. Compiling and Running 1. Go Language network programming: ICMP sample code ICMPTEST.GO1 Package Main2 3 Import (4 "FMT"5 "Net"6 "OS"7 "io"8 "bytes"9 )Ten One Func Main () { A ifLen (OS. Args)! =2 { -Fmt. Println ("Usage:", OS. args[0],"Host") -Os. Exit (0) the } -Service: = OS. args[1] - -Conn, Err: = Net. Dial ("ip4:icmp", service) + checkerror (Err) - + v

When doing an ICMP attack, the function that sends the packet is first written in Python.The data packet is Scapy module which needs to be installed first: Apt-get install Python-scapy" "Date:2014/12/3author:yssfunction:send packets from host to server with multithreading" "ImportThreading fromTimeImportSleep,ctime fromScapy.allImport*Num=1000#The number of the threadclassMyThread (Threading. Thread):def __init__(self,func,args,name="'): Threading. Th

How the ICMP ping test works Ping is a dedicated IP network tool that Ping sends an ICMP echo request message to the destination and reports whether it receives the expected ICMP echo response. Each operating system has the Ping tool installed, and any common enterprise platform, like Windows or Mac OS X, can find it. You can run the Ping delay test on any netw

Often encounter some problems is that the host is clearly online but the ping does not work, the other party may have opened the Forbidden Ping modeSometimes for security concerns, we need to disable ping for our Linux servers.Turn off ICMP protocol (ping-forbidden)echo "1" >/proc/sys/net/ipv4/icmp_echo_ignore_allCat/proc/sys/net/ipv4/icmp_echo_ignore_allOpen ICMP Protocol (disable ping)echo "0" >/proc/sys/

(config) # ip route 0.0.0.0 0.0.0.0 172.161.1.2 # GZGZ (config) # interface f0/0GZ (config-if) # ip add 10.2.2.254 255.255.255.0GZ (config-if) # no shGZ (config-if) # exitGZ (config) # int s1/1GZ (config-if) # ip add 172.161.1.2 255.255.255.0GZ (config-if) # encapsulation frame-relay IETFGZ (config-if) # frame-relay map ip 172.161.1.1 201 broadcastGZ (config-if) # no shGZ (config-if) # exitGZ (config) # I P route 0.0.0.0 0.0.0.0 172.161.1.1 so that we can ping the Intranet IPBJ on GZ on BJ # pi

The ICMP redirection field, used by the router to notify the host of the optimal gateway to the target, is another vro on the data link. Purpose: 1. Verify redirection. 2. The impact of redirection on host data forwarding. 3. Disable the data forwarding process after redirection. Tutorial topology: Experiment Design: 1. R2, R3, R4, and R5 run the RIPv2 protocol. R1 disables the routing function and points the default gateway to R2. 2. the R4 and R5 i

This is a creation in Article, where the information may have evolved or changed. 1. Code 2. Compiling and Running 1. Go Language network programming: ICMP sample code ICMPTEST.GO 1 Package Main2 3 Import (4 "FMT"5 "Net"6 "OS"7 "io"8 "bytes"9 )Ten One Func Main () { A ifLen (OS. Args)! =2 { -Fmt. Println ("Usage:", OS. args[0],"Host") -Os. Exit (0) the } -Service: = OS. args[1] - -Conn, Err: = Net. Dial ("ip4:

using Prometheus+blackbox_exporter to monitor HTTP, ICMP network performanceNot many words, the network still need to monitor up. Reproduced in the last blog post I posted the next Prometheus Monitoring chart, here in detail the following usage.The steps to install Prometheus, Grafana are skipped, not the focus here, if needed, can be turned over my previous blog notes.Cd/usr/local/prometheusVim prometheus.yml Add the following (the 51cto editor will

Referenced from: http://blog.csdn.net/qq844352155/article/details/49700121How to turn off the ICMP echo function input in Linux: Echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all If you need a ping general input: Echo 0 >/proc/sys/net/ Ipv4/icmp_echo_ignore_all This command will fail after restarting, so it should be turned on automatically after the echo "Echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all" >> /etc/rc.d/rc.localHow to turn off the

VPN. 3. Modify/Add/etc/sysctl. conf Vim/etc/sysctl. conf Make sure that all the following fields have the same or the following values. To save trouble, directly paste the following content at the end of/etc/sysctl. conf. Net. ipv4.ip _ forward = 1 Net. ipv4.conf. default. rp_filter = 0 Net. ipv4.conf. all. send_redirects = 0 Net. ipv4.conf. default. send_redirects = 0 Net. ipv4.conf. all. log_martians = 0 Net. ipv4.conf. default. log_martians = 0 N

Run the route command to view all the routes. Route The result is roughly as follows: Kernel IP route table destination gateway subnet mask mark hop reference using interface default 192.168.8.1 0.0.0.0 UG 0 0 255.192.168.8.1 255.255.255.255 UGH 0 0 0 wlan0110.185.76.107 192.168.8.1 255.255.255.255 UGH 0 0 wlan0link-local * 255.255.255.0.0 U 1000 0 0 0 wlan0192.168.0.40 * 255.255.255.255 UH 0 0 0 ppp0192.168.8.0 * 255.255.255.0 U 2 0 0 wlan0 Configure all traffic to go through the

Bgp mpls/VPN Network Technology BGP protocol has been well known for a long time. Its powerful routing policy tool capabilities and its storage and routing performance go beyond any internal gateway protocol of the image model, therefore, it exists as a "bridge" between autonomous systems. before that, there was an EGP protocol, and few people knew it, because it was not widely used, and it is not used by the US military now, but there are not many po

Zhang Yue's explanation of Visual C ++ network programming examples is very good, and his code is very beautiful! Books on network programming were abandoned for a long time. Pick up again in this period of time to fill in the deficiencies! This is an example of his first chapter. Simulate ping to send ICMP Packets: 1. program source code //////////////////////////////////////// //// // //////////////////////////////////////// //// // ////////

-shared key)" as above )" And enter the same content as the previous one. Click "Next". In the displayed window, click "add" to open the "IP Filter list" window. Click "add", click "Next", and set the source address to "I" Click "Next", set the target address to "any IP Address", click "Next", and select ICMP as the Protocol, now you can click "finish" and "close" to return. This You can see the created filter in the IP Filter list, select it, click "

This article describes the C + + computing ICMP header checksum method, share for everyone to reference. The specific implementation code is as follows: Copy Code code as follows: USHORT Checksum (ushort* buff, int nsize) { unsigned long cksum=0; Add the data to the cksum in Word units while (Nsize > 1) { Cksum + = *buff++; Nsize-= sizeof (USHORT); } If it is odd, extend the last word to two words, then add if (nsize) { Cksu

forwarding rule = "virtual server =". Add port 1723, enter the LAN ip address corresponding to the vpn server. After the connection is successful, windows will get an IP address assigned by the vpn server.Ip address allocated to the client by vpnIp address allocated to the client by vpnAt this point, the vpn can be used. If the