Linux之Squid(正向代理和反向代理)

正向代理（实验条件：(真机)IP：172.25.254.4能上网；虚拟机IP：172.25.254.104不能上网；让虚拟机使用代理去联网）

正向代理 是位于客户端和原始服务器之间的服务器，为了从原始服务器取得内容，客户端向代理发送一个请求并指定目标(原始服务器)，然后代理向原始服务器转交请求并将获得的内容返回给客户端。
 

第一步：配置真机的网络环境，保证能够联网

vim /etc/sysconfig/network-scripts/ifcfg-eth0
vim  /etc/resolv.conf      
: nameserver 114.114.114.114 ##配置虚拟机网关，先让真机能上网
systemctl restart network

第二步：下载、安装Squid软件

yum install squid.x86_64  -y     ##代理软件

如果需要配置Squid用户名、密码参考下面这篇博客：

https://blog.csdn.net/u013310119/article/details/106837039 

第三步：修改squid.conf配置文件，配置代理

vim /etc/squid/squid.conf   

#
# Recommended minimum configuration:
#

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 10.0.0.0/8     # RFC1918 possible internal network
acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl localnet src fc00::/7       # RFC 4193 local private network range
acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl CONNECT method CONNECT

#
# Recommended minimum Access Permission configuration:
#
# Deny requests to certain unsafe ports
#http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
#http_access deny CONNECT !SSL_ports

# Only allow cachemgr access from localhost
#http_access allow localhost manager
#http_access deny manager

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#

# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow all
http_access allow localhost

# And finally deny all other access to this proxy
#http_access deny all

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 100 16 256

# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid

#
# Add any of your own refresh_pattern entries above these.
#
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320

request_header_access X-Forwarded-For deny all
request_header_access From deny all
request_header_access Via deny all
 
auth_param basic program /usr/lib64/squid/basic_ncsa_auth /etc/squid3/passwords
auth_param basic realm proxy
acl authenticated proxy_auth REQUIRED
http_access allow authenticated

http_port 9093

第四步：重启Squid，并且防火墙放开9093端口

systemctl restart squid                              ###重启代理
firewall-cmd --permanent --add-port=9093/tcp         ##开启端口9093；代理端口是9093
firewall-cmd --reload                                ##刷新

第五步：虚拟机配置代理

在preferences-->Advanced-->Network-->settings-->manual proxy configuration-->http proxy:代理主机IP； port：9093-->点击use this proxy server for all protocols
 

第六步：测试

可以访问百度，但是ping不通

 

参考博客地址：

https://blog.csdn.net/zzl95415/article/details/79247696?utm_medium=distribute.pc_relevant.none-task-blog-baidujs-1