How to monitor the internal and external traffic and program session in the network environment based on the regional firewall scheme

I. Background description

1. Network environment configuration for Central site Shanghai and branch site Nanjing

2. The center site has three areas: Extranet area, intranet area, DMZ area

3.DMZ Zone has enterprise internal server (DNS, WEB, Email, FTP) and remote administration via SSH and HTTPS encryption

4. Central site DMZ address pool: 172.18.100.0/24

Central site inside address pool: 172.18.101.0/24

Ii. Firewall-critical configuration based on region

How do I release the normal access traffic for out access to the DMZ?

The key is how to define the normal access traffic.

In the DMZ, where the enterprise's servers (DNS, WEB, Email, FTP) are deployed and managed remotely via SSH and HTTPS encryption, these flows are normal traffic, expressed as:

HTTP 80

HTTPS 443

FTP 20/21

POP3 110

IMAP 143

IMAP over SSL 993

SSH 22

SMTP 25

The command is expressed as:

Traffic map matching rule: