[ 리눅스 - SQUID ] client가 ftp/http/https를 연결하기 위하여 squid의 default tcp/3128 포트 1개를 보는 것이 맞을런지요 ?
SQUID를 사용하여 Forward Proxy를 사용시에,
Client ------------> Proxy(SQUID) 연결되는 구조에서, SUQID가 listen 하는 포트는 1개(default 3128)만 열만 되더라구요1\ Client 입장에서는 ftp/http/https가 보는 IP/Port가 모두 동일해 지는거 같은데 이런 이해가 맞는 것 일런지요 ?
2\ 1번이 맞다면, SQUID에서 본인이 받은 3128 port 로 수신한 프로토콜을 ftp/http/https를 패킷을 까서 안의 내용에 따라서 적절하게 인터넷 해당 서버로 다시 연결하는 건지요 ?
이렇다면, squid가 Deep Packet Inspection(DPI) 기능을 일부 하는 거 같아서요
아시는 분의 한수 가름침 부탁 드려 봅니다.
#### CLIENT@
# profile
export proxy_socket=http://172.31.11.133:3128/
export ftp_proxy=$proxy_socket
export http_proxy=$proxy_socket
export https_ proxy=$proxy_socket
#### SERVER@
#> more /etc/squid/squid.conf
# 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 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 localnet
http_access allow localhost
# And finally deny all other access to this proxy
http_access deny all
# Squid normally listens to port 3128
http_port 3128
감사합니다.