Registered · Cross-platform

7400 RTPS / DDS

TCP Yes
UDP Yes
SCTP —
DCCP —

What it is

Real-Time Publish-Subscribe (DDS) discovery.

When / why

Robotics/industrial real-time data (ROS 2, DDS).

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

Registered (1024–49151). Assigned by IANA on request; usable without elevated privileges on most systems.

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Firewall rules for port 7400

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 7400

Allow TCP 7400 (RTPS / DDS). Replace <source> with the network/host that should reach it.

sudo ufw allow proto udp from <source> to any port 7400

Allow UDP 7400 (RTPS / DDS). 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="7400" protocol="tcp" accept'

Allow TCP 7400 (RTPS / DDS) from <source>. Run 'firewall-cmd --reload' afterwards.

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="7400" protocol="udp" accept'

Allow UDP 7400 (RTPS / DDS) from <source>. Run 'firewall-cmd --reload' afterwards.

nftables

nft add rule inet filter input ip saddr <source> tcp dport 7400 accept

Allow TCP 7400 (RTPS / DDS). Assumes table 'inet filter' with an 'input' chain.

nft add rule inet filter input ip saddr <source> udp dport 7400 accept

Allow UDP 7400 (RTPS / DDS). Assumes table 'inet filter' with an 'input' chain.

iptables

sudo iptables -A INPUT -p tcp -s <source> --dport 7400 -j ACCEPT

Allow TCP 7400 (RTPS / DDS). Persist with iptables-save/netfilter-persistent.

sudo iptables -A INPUT -p udp -s <source> --dport 7400 -j ACCEPT

Allow UDP 7400 (RTPS / DDS). Persist with iptables-save/netfilter-persistent.

Azure NSG

az network nsg rule create -g <resource-group> --nsg-name <nsg> -n Allow-rtpsdds-7400 --priority 1000 --access Allow --direction Inbound --protocol "*" --source-address-prefixes <source> --destination-port-ranges 7400

Inbound rule for 7400 (RTPS / DDS). 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=7400,ToPort=7400,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound TCP 7400 (RTPS / DDS). 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=7400,ToPort=7400,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound UDP 7400 (RTPS / DDS). Replace <source-cidr> (e.g. 10.0.0.0/16).

GCP firewall

gcloud compute firewall-rules create allow-rtpsdds-7400 --direction=INGRESS --action=ALLOW --rules=tcp:7400,udp:7400 --source-ranges=<source-cidr> --network=<network>

Ingress rule for 7400 (RTPS / DDS). Scope with --source-ranges and optionally --target-tags.

Windows netsh

netsh advfirewall firewall add rule name="Allow RTPS / DDS 7400/TCP" dir=in action=allow protocol=TCP localport=7400 remoteip=<source>

Inbound TCP 7400 (RTPS / DDS). Set remoteip to a host/subnet; 'any' is discouraged.

netsh advfirewall firewall add rule name="Allow RTPS / DDS 7400/UDP" dir=in action=allow protocol=UDP localport=7400 remoteip=<source>

Inbound UDP 7400 (RTPS / DDS). Set remoteip to a host/subnet; 'any' is discouraged.

Windows PowerShell

New-NetFirewallRule -DisplayName "Allow RTPS / DDS 7400/TCP" -Direction Inbound -Action Allow -Protocol TCP -LocalPort 7400 -RemoteAddress <source>

Inbound TCP 7400 (RTPS / DDS). Replace <source> with a host or subnet.

New-NetFirewallRule -DisplayName "Allow RTPS / DDS 7400/UDP" -Direction Inbound -Action Allow -Protocol UDP -LocalPort 7400 -RemoteAddress <source>

Inbound UDP 7400 (RTPS / DDS). 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.