Why Did I Lose DHCP Hostnames After Firmware Upgrade?
Zyxel_Kevin
Posts: 958 
Guru Member
Guru Member
Question: Why did I lose DHCP hostnames after upgrading my USG FLEX device to firmware version uOS 1.30?
Answer:
From firmware version uOS 1.30 onwards, DHCP hostnames must comply with RFC1123 rules, which require the following:
- Hostnames cannot start with a hyphen (-).
- They may only contain letters (A-Z, a-z), numbers (0-9), and hyphens (-).
- Maximum length is 255 characters.
If a previously entered hostname did not comply with these rules, it is possible that the system automatically converted it to a MAC address. This might be why the hostnames were lost or replaced during the firmware upgrade.
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