Digi LR54 User Manual page 244

Serial port
To limit access to specified IPv4 addresses and networks:
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ii. For Add Address, click .
iii. For Address, enter the IPv4 address or network that can access the device's
iv. Click  again to list additional IP addresses or networks.
To limit access to specified IPv6 addresses and networks:
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ii. For Add Address, click .
iii. For Address, enter the IPv6 address or network that can access the device's
LR54 User Guide
i. Click IPv4 Addresses.
service-type. Allowed values are:
A single IP address or host name.
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A network designation in CIDR notation, for example, 192.168.1.0/24.
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any: No limit to IPv4 addresses that can access the service-type.
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i. Click IPv6 Addresses.
service-type. Allowed values are:
Configure UDP serial mode
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