iptables vpn

CentOS installation VPN appears some of the site can not access the problem! Some forwarding rule settings for iptables The NAT conversion rule is established, otherwise the dial cannot be connected to the public network through the remote gateway. Iptables-t nat-a postrouting-o eth0-j snat–to-source $src _ip Centos 6.4 Installing

The company now uses iptables as the firewall in the LAN, the Internet is no problem. This time, because of the test, you need to connect PPTP VPN. The problem is, the VPN dial has failed and reported 619 errors. I have no problem with my cell phone or my home dialing. Landing the router, the PPTP support all open to try again, the result is not. Then find the

This article describes how to build a PPTP VPN service on a Xen VPS that installs the CentOS operating system. Includes the installation, configuration, and corresponding iptables rules for PPTP. This article temporarily does not involve the PPTP traffic control part, waits for the time to learn to understand the Freeradius, then writes the sequel. July 20, 2011 Update: In the security recommendations secti

ifconfig. Create an iptables file in the/etc/network/if-up.d/directory with the following content:#! /Bin/sh Iptables-restore Add the execution permission to the script:Chmod + x/etc/NET/if-up.d/iptables Modify/etc/sysctl. the conf content is as follows: There are two items not listed above. You can simply add them directly. Other projects mainly remove comments

/PPP/options. Find the "MS-DNS" project in it: MS-DNS 8.8.8.8MS-DNS 8.8.4.4 # Allow forwarding, edit/etc/sysctl. conf, and check whether the net. ipv4.ip _ forward parameter is 1, or directly execute the following command to view Sysctl net. ipv4.ip _ forward # If the output is 0, modify net. ipv4.ip _ forward in/etc/sysctl. conf, change 0 to 1, and then run the following command. Sysctl-P # Finally, run this command to enable iptables forwarding supp

solution will not be guaranteed. Solution 2: wired The cable solution can only deploy single-mode optical fiber cables at a distance of 12 kilometers, which is more time-consuming and costly. You can say you don't have to think about it. Solution 3: Internet + VPN The Internet can be said to be a public wide area network, and many telecom operators have established a four-way and eight-way long-distance network, which makes it possible for our compan

Pptp settings and local vpn (and solve the problem that ssh cannot access the remote host under the vpn), pptpssh1. Install pptpSudo apt-get install-y ppp pptpdsudo vim/etc/pptpd. conf modification: option/etc/ppp/pptpd-optionslocalip 172.31.26.19 (local vpn address) remoteip 172.31.26.20-200 (vpn customer point addres

Pptp settings and local vpn (and solve the problem that ssh cannot access the remote host under the vpn)1. Install pptpSudo apt-get install-y ppp pptpdsudo vim/etc/pptpd. conf modification: option/etc/ppp/pptpd-optionslocalip 172.31.26.19 (local vpn address) remoteip 172.31.26.20-200 (vpn customer point address range)C

Rd and RT (mpls vpn bgp) Rd (route-distinguisher) is used to identify different VPN instances on the PE device. Its main function is to achieve address multiplexing between VPN instances. It and the IP address constitute a 12byte vpnv4 address space, rd and the route are carried together in the bgp update message and published to the peer end. On the one hand, we

-192.168.6.20-j ACCEPT Can I only allow external hosts to Ping VPN devices? You can first select "accept response request (external ping)" on the "external access" interface, and then add specific rules for external interfaces in the firewall rules, select "add self-built firewall rules to built-in rules" The following rule allows x. x/y to ping the VPN device. x indicates the network address or host add

Install pptp vpn under CentOS7 Install pptp vpn in Centos 7 1. Check whether the system kernel supports MPPE. Modprobe ppp-compress-18 echo OK If "OK" is displayed, MPPE is supported. 2. Check whether TUN/TAP support is enabled. Cat/dev/net/tun Cat:/dev/net/tun: The file descriptor is in the error state. If the command displays the following text, it indicates that 3. Check whether P

This article compares the IPSec VPN and ssl vpn technologies in detail, so that users from all walks of life can better understand the VPN technology and select the appropriate VPN product. Another VPN implementation technology different from the traditional

-- dport 500-j ACCEPT7 iptables-a input-I eth0-p tcp -- dport 500-j ACCEPT8 iptables-a input-I eth0-p udp -- dport 4500-j ACCEPT9 iptables-a input-I eth0-p udp -- dport 1701-j ACCEPT10 iptables-a input-I eth0-p tcp -- dport 1723-j ACCEPT11 iptables-a forward-j REJECT12

Install l2tp/ipsec vpn in Centos 71. install the software package required by l2tp ipsec Yum install epel-release Yum install openswan xl2tpd ppp lsof 2. Set ipsec 2.1 edit/etc/ipsec. conf Vi/etc/ipsec. confReplace xx. xxx with the actual Internet fixed IP address of your host. Others do not move. Config setup Protostack = netkey Dumpdir =/var/run/pluto/ Nat_traversal = yes Virtual_private = % v4: 10.0.0.0/8, % v4: 192.168.0.0/1

WIN8 Cisco VPN 442 Error solution/Error Code 442 Cisco VPN Clinet with Windows 8 when you start using win8, because of work needs to use Cisco VPN Client, however, in win8, the Cisco VPN Client reports a 442 Error and cannot be used. The following Error message is displayed: Error Code 442 while connect to

can we allow employees in other countries to access intranet resources? The solution of VPN is to set up a VPN Server in the Intranet. The VPN Server has two NICs, one connecting the Intranet and the other connecting the internet. After local employees connect to the internet, they can find the VPN Server through the

Iptables practical tutorial (1): Basic Concepts and Principles, iptables practical tutorialOverview Iptables is a built-in firewall software for linux. It is used to configure IPv4 packet filtering or NAT (ip6tables for IPv6 ). In linux, the firewall is actually part of the system kernel. Based on the Netfilter architecture, the basic principle is to place some h

What is VPN? The full name of VPN is "Virtual Private Network", which is translated as "Virtual Private Network ". VPN is defined as a temporary and secure connection through a public network (usually the internet). It is a secure and stable tunnel through a chaotic public network. Using this tunnel can encrypt data several times to ensure secure Internet use.