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Interesting ipsec vpn connection Configuration

recent years, we decided to use the predecessor of openswan, freeswan, and the same freeswan, which was also removed from the ah support after version 2.6, so we used version 1.99.To support the older freeswan, we changed the system to redhat9.Since freeswan and openswan are the same, the configuration format and environment are very similar. Next we just need to briefly talk about the differences.1. freeswan provides fewer ipsec verify detection items, which is also related to redhat9 not supp

Vpn Principle and Implementation-Build a vpn with a virtual Nic

wire is a virtual network. Isn't the IP network built on a variety of LAN, Wan, and telecom networks, are virtual networks on physical networks, such as television networks? From a layered perspective, pstn can be regarded as a virtual network. vpn is of more special significance as a virtual network, and is also implemented in a variety of ways. Ip over ssl does not touch the protocol stack, nor does it add new protocols. It uses the flexibility of ssl to encapsulate ip addresses more securely

Iptables settings in CentOS5

# TCP25 port (SMTP) Iptables-a input-p tcp -- dport 25-j ACCEPT # TCP465 port (SMTPS) Iptables-a input-p tcp -- dport 465-j ACCEPT # TCP110 port (POP3) Iptables-a input-p tcp -- dport 110-j ACCEPT # TCP995 port (POP3S) Iptables-a input-p tcp -- dport 995-j ACCEPT # TCP143 port (IMAP) Iptables-a input-p tcp -- dport 143-j ACCEPT # TCP993 port (IMAPS) Iptables-a input-p tcp -- dport 993-j ACCEPT # UDP1194 port (OpenVPN) Iptables-a input-p udp -- dport

How to send an Email with attachments in Linux text mode

Article Title: how to send an Email with an attachment in Linux text mode. Linux is a technology channel of the IT lab in China. Some basic categories, such as desktop applications, Linux system management, kernel research, embedded systems, and open-source systems, need to send attachments in Linux text mode. What should I do? That is, use mail + uuencode. [Root @ room i386] # uuencode openvpn-2.0.5-1.i386.rpm

How hackers have hacked into your site

:0:99999:7::: Sync:*:14495:0:99999:7::: Shutdown:*:14495:0:99999:7::: Halt:*:14495:0:99999:7::: Mail:*:14495:0:99999:7::: Uucp:*:14495:0:99999:7::: Operator:*:14495:0:99999:7::: Games:*:14495:0:99999:7::: Gopher:*:14495:0:99999:7::: Ftp:*:14495:0:99999:7::: Nobody:*:14495:0:99999:7::: vcsa:!! : 14557:::::: avahi-autoipd:!! : 14557:::::: Ntp:!! : 14557:::::: dbus:!! : 14557:::::: rtkit:!! : 14557:::::: nscd:!! : 14557:::::: tcpdump:!! : 14557::::

RHEL4/5iptables instance (updating)

/iptables-I INPUT-p udp -- sport 123-j ACCEPTSudo/sbin/iptables-I OUTPUT-p tcp -- dport 53-j ACCEPTSudo/sbin/iptables-I INPUT-p tcp -- sport 53-j ACCEPTSudo/sbin/iptables-I OUTPUT-p udp -- dport 53-j ACCEPTSudo/sbin/iptables-I INPUT-p udp -- sport 53-j ACCEPT# Allow lo port mutual accessSudo/sbin/iptables-I input-I lo-j ACCEPTSudo/sbin/iptables-I OUTPUT-o lo-j ACCEPT# Allow icmp PacketsSudo/sbin/iptables-I INPUT-p icmp-j ACCEPTSudo/sbin/iptables-I OUTPUT-p icmp-j ACCEPT# Allow mutual access betw

Set mysql encoding on linux

Set mysql encoding in linux Set mysql encoding in linux First, find the location of the MySql cnf file: [Root @ flyHome gaoxiang] # find/-iname '*. cnf'-print /Etc/pki/tls/openssl. cnf /Etc/my. cnf /Usr/share/openvpn/easy-rsa/2.0/openssl-0.9.6.cnf /Usr/share/openvpn/easy-rsa/2.0/openssl. cnf /Usr/share/openvpn/easy-rsa/1.0/openssl. cnf /Usr/share/mysql/my-small.

Security Gateway 3: IPTables

online environment is as follows: The user logs on to the OpenVPN system. After the system passes verification, the user obtains a private IP address and records the account name. After the connection is established, the OpenVPN system calls the Connect script. IPtables adds the user's IP address to the corresponding rule group Chain. The user obtains the corresponding access permissions. The user co

Linux-openssh advanced Password Policy

Yesterday, I suddenly saw someone asking on the internet how to reinforce openssh Using password + certificate dual authentication. I saw a solution, that is, using openvpn to log on first and then using openssh certificate to log on, my mom, we need to build an openvpn to add a password. In fact, if we have an existing deployment, we have nothing to say about openvpn

How hackers have hacked into your site

:::Daemon:*:14495:0:99999:7:::Adm:*:14495:0:99999:7:::Lp:*:14495:0:99999:7:::Sync:*:14495:0:99999:7:::Shutdown:*:14495:0:99999:7:::Halt:*:14495:0:99999:7:::Mail:*:14495:0:99999:7:::Uucp:*:14495:0:99999:7:::Operator:*:14495:0:99999:7:::Games:*:14495:0:99999:7:::Gopher:*:14495:0:99999:7:::Ftp:*:14495:0:99999:7:::Nobody:*:14495:0:99999:7:::vcsa:!! : 14557::::::avahi-autoipd:!! : 14557::::::Ntp:!! : 14557::::::dbus:!! : 14557::::::rtkit:!! : 14557::::::nscd:!! : 14557::::::tcpdump:!! : 14557::::::av

Troubleshoot packaged soft link packaging failure issues

17062 Dec 10:03 fabric-scripts.tar.gz-rw-r--r--. 1 root root 33502 Nov 00:48 Install.logDrwxr-xr-x. 2 root root 4096 APR 7 15:08 logsDrwxr-xr-x. 3 root root 4096 Mar 10:35 Mysql-sql-rw-r--r--. 1 root root 415 Apr 16:42 rc.local.tar.gz-rw-r--r--. 1 root root 117 Apr 16:31 tar.gz[Email protected] ~]# sz rc.local.tar.gzRzStarting Zmodem transfer. Press CTRL + C to cancel.100% 415 bytes 415 bytes/s 00:00:01 0 Errors[Email protected] ~]#650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M01/7E/E

Use openswan on centos/RedHat 5.4 to build a VPN between data centers

Recently, due to the high traffic of the primary data center, several independent hosts were purchased abroad for traffic distribution and cost. This requires two data centers.Data Synchronization, including MySQL, MongoDB, and reverse proxy. By creating a VPN using IPSec to connect two subnets togetherThe most suitable solution. We have initially considered using openvpn, but because our application involves a large amount of data transmission, the p

Six encryption tools ensure Data Transmission Security

v2/v3), Transport Layer Security Protocol (TLS v1), and Common encryption libraries. This project is managed by volunteers worldwide who use Internet communications and are responsible for the compilation of relevant documents. 3. TOR: for companies that use Internet communications, Tor is a good tool that can improve the security of their communication. Tor can help users to anonymize web browsing and publishing, instant messaging, ssh, and other TCP-enabled applications. Tor also provides a p

Chrony software instructions for use, chrony instructions for use

Chrony software instructions for use, chrony instructions for use1.1.1 chrony Introduction Chrony is an open-source free software that can keep the system clock synchronized with the clock server (NTP) and keep the time accurate. It consists of two programs: chronyd and chronyc. Chronyd is a daemon running in the background. It is used to adjust the system clock running in the kernel and synchronize the clock server. It determines the ratio of the increase or decrease time of the computer and co

Let's talk about the TCP Nagle algorithm and the TCP_CORK option.

Event playback uses OpenVPN to transmit virtual desktop traffic. The terminal screen is obviously refreshed frame by frame, and the network environment is a 10-Gigabit LAN.Analysis 1. First, change OpenVPN to the TCP mode, because the difference between TCP and UDP in the LAN environment is not big, it will not cause the re-transmission overlay problem. The advantage of TCP is that it can be used for arbitr

Conntrack Hash lookup in protocol stack processing/bloom filter/cache Find/Package/package/layered processing style

to transmit jumbo frames (which means it's way wider!). ), there is nothing wrong with that.But if you have a wide path, do you have to transfer jumbo frames? Wouldn't it be more efficient to run small frames? Two-way 10 lanes for the running of the card is no problem, but run the car estimated better, if not to transport, then the throughput of transport aircraft, although not more than the freighter, but the delay is much smaller. In fact, on a post-departure link, even if you transmit jumbo

Undo operation in Linux TCP congestion control

, when there is new data//ready, simply exit, let the send path self-processing! if (!tcp_can_forward_retransmit (SK)) break; if (hole! = NULL) {SKB = hole; Hole = NULL; }//Only "forward send" fwd_rexmitting = 1 when tcp_can_forward_retransmit does not break; Goto BEGIN_FWD; } else if (! ( Sacked Tcpcb_lost) {if (hole = = NULL !) ( Sacked (tcpcb_sacked_retrans| tcpcb_sacked_acked))) hole = SKB; Continue } else {//Send lost dat

A noise about the Linux bridge configuration

must buy or assemble a tall PC, Like 10 years ago, many people were fond of the large machines that were almost extinct today. In this post-terminal era, buy a small board can be loaded with Linux may be a good idea, it consumes less power, no noise, small, anywhere can be plugged in, long-term boot also does not matter, it is to do the best choice of home internet agent. Colleagues bought a small board like this, it is said to be very good. What do you need to do now when you want to be able t

A noise about the Linux bridge configuration

must buy or assemble a tall PC, Like 10 years ago, many people were fond of the large machines that were almost extinct today. In this post-terminal era, buy a small board can be loaded with Linux may be a good idea, it consumes less power, no noise, small, anywhere can be plugged in, long-term boot also does not matter, it is to do the best choice of home internet agent. Colleagues bought a small board like this, it is said to be very good. What do you need to do now when you want to be able t

A noise about the Linux bridge configuration

assemble a tall pc, just like 10 years ago when a lot of people love a mainframe that is almost extinct. In this post-terminal era. Buy a small board that can carry Linux may be a good idea, it consumes less power, no noise, small, anywhere can be plugged in, long-term boot also does not matter, it is to do the best choice of home internet agent.Colleagues bought a small board like this, it is said to be very good. What do you need to do now when you want to be able to surf the Internet through

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