
Description
This article describes how the Network Ethernet Settings in Grandstream FXO gateway only allow the following block of IP addresses, as stated in RFC1918.
The RFC reserves the following ranges of IP addresses that cannot be routed on the Internet:
- 10.0.0.0 – 10.255.255.255 (10/8 prefix)
- 172.16.0.0 – 172.31.255.255 (172.16/12 prefix)
- 192.168.0.0 – 192.168.255.255 (192.168/16 prefix)
The incorrect IP range or subnet mask will prompt you with a ‘Mask Mismatch’ warning or Web UI login failure in HT8X1.