Digi Connect IT 4 User Manual page 224

Serial port
iii. Enable TCP keep-alive messages:
(config)>serial port1 service tcp keepalive true
(config)>
iv. Set the option that initiates the connection:
(config)>serial port1 service tcp conn_type value
(config)>
where value is one of:
The default is tls.
v. Enable TCP nodelay messages:
(config)>serial port1 service tcp nodelay true
(config)>
vi. (Optional) Configure access control:
Digi Connect IT® 4 User Guide
tcp
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tls
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tls_auth
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To limit access to specified IPv4 addresses and networks:
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(config)> add serial port1 service tcp acl address end value
(config)>
Where value can be:
A single IP address or host name.
l
A network designation in CIDR notation, for example, 192.168.1.0/24.
l
any: No limit to IPv4 addresses that can access the service-type.
l
Repeat this step to list additional IP addresses or networks.
To limit access to specified IPv6 addresses and networks:
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(config)> add serial port1 service tcp acl address6 end value
(config)>
Where value can be:
A single IP address or host name.
l
A network designation in CIDR notation, for example, 2001:db8::/48.
l
any: No limit to IPv6 addresses that can access the service-type.
l
Repeat this step to list additional IP addresses or networks.
To limit access to hosts connected through a specified interface on the
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Connect IT 4 device:
(config)> add serial port1 service tcp acl interface end value
(config)>
Where value is an interface defined on your device.
Configure Remote Access mode
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