67 DHCP / BOOTP serverDHCP server receives client requests on UDP/67.
Server side of DHCP; relay agents forward broadcasts here.
| Transport | Status | Meaning |
|---|---|---|
| TCP | Assigned | Assigned by IANA, but not 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. |
Well-known (0–1023). System port for a core service. On Unix-like systems, binding it requires superuser privileges.
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Copy-ready inbound rules for the active transports. Replace every <source> placeholder with the specific host, subnet, or CIDR that should reach this port.
sudo ufw allow proto udp from <source> to any port 67Allow UDP 67 (DHCP / BOOTP server). Replace <source> with the network/host that should reach it.
sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="67" protocol="udp" accept'Allow UDP 67 (DHCP / BOOTP server) from <source>. Run 'firewall-cmd --reload' afterwards.
nft add rule inet filter input ip saddr <source> udp dport 67 acceptAllow UDP 67 (DHCP / BOOTP server). Assumes table 'inet filter' with an 'input' chain.
sudo iptables -A INPUT -p udp -s <source> --dport 67 -j ACCEPTAllow UDP 67 (DHCP / BOOTP server). Persist with iptables-save/netfilter-persistent.
az network nsg rule create -g <resource-group> --nsg-name <nsg> -n Allow-dhcpbootpserver-67 --priority 1000 --access Allow --direction Inbound --protocol UDP --source-address-prefixes <source> --destination-port-ranges 67Inbound rule for 67 (DHCP / BOOTP server). Set <source> to a CIDR; lower priority number = higher precedence.
aws ec2 authorize-security-group-ingress --group-id <sg-id> --ip-permissions IpProtocol=udp,FromPort=67,ToPort=67,IpRanges="[{CidrIp=<source-cidr>}]"Inbound UDP 67 (DHCP / BOOTP server). Replace <source-cidr> (e.g. 10.0.0.0/16).
gcloud compute firewall-rules create allow-dhcpbootpserver-67 --direction=INGRESS --action=ALLOW --rules=udp:67 --source-ranges=<source-cidr> --network=<network>Ingress rule for 67 (DHCP / BOOTP server). Scope with --source-ranges and optionally --target-tags.
netsh advfirewall firewall add rule name="Allow DHCP / BOOTP server 67/UDP" dir=in action=allow protocol=UDP localport=67 remoteip=<source>Inbound UDP 67 (DHCP / BOOTP server). Set remoteip to a host/subnet; 'any' is discouraged.
New-NetFirewallRule -DisplayName "Allow DHCP / BOOTP server 67/UDP" -Direction Inbound -Action Allow -Protocol UDP -LocalPort 67 -RemoteAddress <source>Inbound UDP 67 (DHCP / BOOTP 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.