LDAP (Lightweight Directory Access Protocol) powerful enterprise class directory service by default listen on UDP port 389 for queries. Following iptable rules allows incoming client request (open port UDP port 389) for server IP address 202.54.1.20 :
iptables -A INPUT -p udp -s 0/0 –sport 1024:65535 -d 202.54.1.20 –dport 389 -m state –state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p udp -s 202.54.1.20 –sport 389 -d 0/0 –dport 1024:65535 -m state –state ESTABLISHED -j ACCEPT
Restrict access to LDAP database server from your network is essential, following iptables allows incoming LDAP client request from IP address 202.54.1.0/24 network only:
iptables -A INPUT -p udp -s 202.54.1.0/24 –sport 1024:65535 -d 202.54.1.20 –dport 389 -m state –state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p udp -s 202.54.1.20 –sport 389 -d 202.54.1.0/24 –dport 1024:65535 -m state –state ESTABLISHED -j ACCEPT
🐧 Get the latest tutorials on SysAdmin, Linux/Unix, Open Source & DevOps topics via:
- RSS feed or Weekly email newsletter
- Share on Twitter • Facebook • 0 comments... add one ↓
Linux: 25 Iptables Netfilter Firewall Examples For New SysAdmins
Top 25 Nginx Web Server Best Security Practices
Linux Building Rules For The Cluster With Firewall Builder
Linux Iptables block or open DNS / bind service port 53
Connecting Linux or UNIX system to Network attached storage device
Linux: Iptables Allow MYSQL server incoming request on port 3306
Linux Iptables: HowTo Block or Open HTTP/Web Service Port 80 & 443
| Category | List of Unix and Linux commands |
|---|---|
| File Management | cat |
| Firewall | Alpine Awall • CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
| Network Utilities | dig • host • ip • nmap |
| OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
| Package Manager | apk • apt |
| Processes Management | bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time |
| Searching | grep • whereis • which |
| User Information | groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w |
| WireGuard VPN | Alpine • CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |