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Bastion Configuration and Installation

Firewall Configuration

Inbound Rules

Type Protocol Port Range Sources
All TCP TCP All ports 131.226.32.251
SSH TCP 22 Custom IP addresses

Outbound Rules

Type Protocol Port Range Destinations
ICMP ICMP All ports All IPv4, All IPv6
SSH TCP 22 All IPv4, All IPv6
DNS TCP TCP 53 All IPv4, All IPv6
HTTP TCP 80 All IPv4, All IPv6
HTTPS TCP 443 All IPv4, All IPv6
Custom TCP 587 All IPv4, All IPv6
DNS UDP UDP 53 All IPv4, All IPv6
Custom UDP UDP 123 All IPv4, All IPv6
Custom UDP UDP 323 All IPv4, All IPv6

Installation

service iptables stop
nslookup bbc.co.uk
systemctl stop iptables
systemctl stop firewalld
systemctl start firewalld

Configuration

N/A - handled by WAF (Web Application Firewall).

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