Well-known · Cross-platform

547 DHCPv6 server

TCP Yes
UDP Yes
SCTP —
DCCP —

What it is

DHCPv6 server/relay port.

When / why

IPv6 DHCP server side.

Protocol status detail

TransportStatusMeaning
TCP Yes Assigned by IANA and standardized, specified, or widely used on this port.
UDP Yes Assigned by IANA and standardized, specified, or widely used on this port.
SCTP — Not applicable for this transport.
DCCP — Not applicable for this transport.
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Port range

Well-known (0–1023). System port for a core service. On Unix-like systems, binding it requires superuser privileges.

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Firewall rules for port 547

Copy-ready inbound rules for the active transports. Replace every <source> placeholder with the specific host, subnet, or CIDR that should reach this port.

ufw

sudo ufw allow proto tcp from <source> to any port 547

Allow TCP 547 (DHCPv6 server). Replace <source> with the network/host that should reach it.

sudo ufw allow proto udp from <source> to any port 547

Allow UDP 547 (DHCPv6 server). Replace <source> with the network/host that should reach it.

firewalld

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="547" protocol="tcp" accept'

Allow TCP 547 (DHCPv6 server) from <source>. Run 'firewall-cmd --reload' afterwards.

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="547" protocol="udp" accept'

Allow UDP 547 (DHCPv6 server) from <source>. Run 'firewall-cmd --reload' afterwards.

nftables

nft add rule inet filter input ip saddr <source> tcp dport 547 accept

Allow TCP 547 (DHCPv6 server). Assumes table 'inet filter' with an 'input' chain.

nft add rule inet filter input ip saddr <source> udp dport 547 accept

Allow UDP 547 (DHCPv6 server). Assumes table 'inet filter' with an 'input' chain.

iptables

sudo iptables -A INPUT -p tcp -s <source> --dport 547 -j ACCEPT

Allow TCP 547 (DHCPv6 server). Persist with iptables-save/netfilter-persistent.

sudo iptables -A INPUT -p udp -s <source> --dport 547 -j ACCEPT

Allow UDP 547 (DHCPv6 server). Persist with iptables-save/netfilter-persistent.

Azure NSG

az network nsg rule create -g <resource-group> --nsg-name <nsg> -n Allow-dhcpv6server-547 --priority 1000 --access Allow --direction Inbound --protocol "*" --source-address-prefixes <source> --destination-port-ranges 547

Inbound rule for 547 (DHCPv6 server). Set <source> to a CIDR; lower priority number = higher precedence.

AWS Security Group

aws ec2 authorize-security-group-ingress --group-id <sg-id> --ip-permissions IpProtocol=tcp,FromPort=547,ToPort=547,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound TCP 547 (DHCPv6 server). Replace <source-cidr> (e.g. 10.0.0.0/16).

aws ec2 authorize-security-group-ingress --group-id <sg-id> --ip-permissions IpProtocol=udp,FromPort=547,ToPort=547,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound UDP 547 (DHCPv6 server). Replace <source-cidr> (e.g. 10.0.0.0/16).

GCP firewall

gcloud compute firewall-rules create allow-dhcpv6server-547 --direction=INGRESS --action=ALLOW --rules=tcp:547,udp:547 --source-ranges=<source-cidr> --network=<network>

Ingress rule for 547 (DHCPv6 server). Scope with --source-ranges and optionally --target-tags.

Windows netsh

netsh advfirewall firewall add rule name="Allow DHCPv6 server 547/TCP" dir=in action=allow protocol=TCP localport=547 remoteip=<source>

Inbound TCP 547 (DHCPv6 server). Set remoteip to a host/subnet; 'any' is discouraged.

netsh advfirewall firewall add rule name="Allow DHCPv6 server 547/UDP" dir=in action=allow protocol=UDP localport=547 remoteip=<source>

Inbound UDP 547 (DHCPv6 server). Set remoteip to a host/subnet; 'any' is discouraged.

Windows PowerShell

New-NetFirewallRule -DisplayName "Allow DHCPv6 server 547/TCP" -Direction Inbound -Action Allow -Protocol TCP -LocalPort 547 -RemoteAddress <source>

Inbound TCP 547 (DHCPv6 server). Replace <source> with a host or subnet.

New-NetFirewallRule -DisplayName "Allow DHCPv6 server 547/UDP" -Direction Inbound -Action Allow -Protocol UDP -LocalPort 547 -RemoteAddress <source>

Inbound UDP 547 (DHCPv6 server). Replace <source> with a host or subnet.

Rules are generated only for transports marked active for this port. They default to an inbound allow with an explicit source placeholder — never any. Review direction, scope, and rule precedence before applying in production.