ssh connect over ssh tunnel

Submitted by lepton on Fri, 11/08/2019 - 11:47

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ssh -o ProxyCommand="ssh -W %h:%p root@jump.example.org" root@target.example.org

or write it to ssh config file

Host xxx

HostName target.example.org

User root

IdentityFile ~/.ssh/id_rsa

ProxyCommand ssh -W %h:%p root@jumphost.example.org

 

 

another

ssh -L local_Port:target.example.org:22 root@jumphost.example.org

write it to ssh config file using LocalForward

Connect Another Net Using IP Tunnel

Submitted by lepton on Fri, 10/18/2019 - 12:28

//computer one ip from ifconfig 192.168.1.2  public ip 2.2.2.2  
ip tunnel del ipip0
ip tunnel add ipip0 mode ipip remote 1.1.1.1 local 192.168.1.2
ip addr add 10.0.0.101/24 dev ipip0
ip link set ipip0 up

 

//computer two ip from ifconfig 192.168.100.2  public ip  1.1.1.1
ip tunnel del ipip0
ip tunnel add ipip0 mode ipip remote 2.2.2.2 local 192.168.100.2
ip addr add 10.0.0.102/24 dev ipip0
ip link set ipip0 up

 

//iptables

c++ 正则表达式

Submitted by lepton on Wed, 12/26/2018 - 13:47

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1.      “.”: 匹配除"\n"之外的任何单个字符,若要匹配包括"\n"在内的任意字符,需使用诸如"[\s\S]"之类的模式;

2.       “^”:匹配输入字符串的开始位置,不匹配任何字符,要匹配”^”字符本身,需使用”\^”;

3.      “$”:匹配输入字符串结尾的位置,不匹配任何字符,要匹配”$”字符本身,需使用”\$”;

4.      “*”: 零次或多次匹配前面的字符或子表达式,”*”等效于”{0,}”,如”\^*b”可以匹配”b”、”^b”、”^^b”、…;

5.      “+”: 一次或多次匹配前面的字符或子表达式,等效于”{1,}”,如”a+b”可以匹配”ab”、”aab”、”aaab”、…;

6.      “?”: 零次或一次匹配前面的字符或子表达式,等效于”{0,1}”,如”a[cd]?”可以匹配”a”、”ac”、”ad”; 当此字符紧随任何其他限定符”*”、”+”、”?”、”{n}”、”{n,}”、”{n,m}”之后时,匹配模式是"非贪心的"。"非贪心的"模式匹配搜索到的、尽可能短的字符串,而默认的"贪心的"模式匹配搜索到的、尽可能长的字符串。如,在字符串"oooo"中,"o+?"只匹配单个"o",而"o+"匹配所有"o";

boost install with cxx14 support

Submitted by lepton on Wed, 10/24/2018 - 15:13

by default boost has build with cxx11 support on mac 10.13 high sierra with xcode 9.4

to avoid link errors with c++14,it should build with c++14 support

./bootstrap.sh  --prefix=path

./b2 link=static cxxflags="-std=c++14" -d+2 stage

// ./b2 .....

//./b2 install

 

//on gentoo may has    error: "none" is not a known value of feature

//this because boost installed and the file /usr/share/boost-build/site-config.jam

//add this --ignore-site-config