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- ## find ports listening
- netstat -an | grep 8000
- netstat -an | grep LISTEN
- ## test connection
- telnet 10.0.3.30 8000
- ## find ports listening
- sudo ss -tulpn | grep 8000
- tcp LISTEN 0 10 0.0.0.0:8000 0.0.0.0:* users:(("python3",pid=273874,fd=4))
- ## firewall rules
- sudo iptables -L INPUT -n -v
- Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
- pkts bytes target prot opt in out source destination
- 6207K 25G ACCEPT 0 -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
- 4 336 ACCEPT 1 -- * * 0.0.0.0/0 0.0.0.0/0
- 260K 27M ACCEPT 0 -- lo * 0.0.0.0/0 0.0.0.0/0
- 13 780 ACCEPT 6 -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
- 247 10680 REJECT 0 -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
- 0 0 ACCEPT 6 -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:8000
- 0 0 ACCEPT 6 -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:8000
- 0 0 ACCEPT 6 -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:8000
- ## list firewll rules
- sudo iptables -L INPUT --line-numbers -n
- Chain INPUT (policy ACCEPT)
- num target prot opt source destination
- 1 ACCEPT 6 -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:3000
- 2 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
- 3 ACCEPT 1 -- 0.0.0.0/0 0.0.0.0/0
- 4 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0
- 5 ACCEPT 6 -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8000
- 6 ACCEPT 6 -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
- 7 REJECT 0 -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
- 8 ACCEPT 6 -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:3000
- ## delete line 5
- sudo iptables -D INPUT 6
- ## add new rule above REJECT
- sudo iptables -I INPUT 5 -p tcp --dport 8000 -j ACCEPT
- sudo netfilter-persistent save
- ## create server process to listen port 5432
- nc -l -p 5432
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