check_dhcp-options

check_dhcp-options.sh

Description

This script validates a Microsoft DHCP XML export and checks whether each DHCP scope has all critical DHCP options defined.
It reports any missing options per scope.

---

Usage

./check_dhcp-options.sh <path_to_dhcp_xml_file>

Example:

./check_dhcp-options.sh dhcp_export.xml

---

Critical Options Checked

• 1 → Subnet Mask
• 3 → Router (Default Gateway)
• 6 → DNS Servers
• 15 → DNS Domain Name
• 51 → Lease Time

---

Features

• Extracts all ScopeId values from the XML.
• Iterates through each scope and checks for the required DHCP options.
• Special handling for Option 1 (Subnet Mask), which may not appear as an OptionValue.
• Reports per-scope status:
  • has all critical options.
  • is missing critical options: <list>

---

Output

• Console output, for example:

  10.0.0.0 is missing critical options: 6 15
  192.168.1.0 has all critical options.
  # check complete #
  

---

Requirements

• Bash
• xmllint (from libxml2-utils)

---

Notes

• Input must be a valid Microsoft DHCP XML export.
• Useful for auditing DHCP scopes after migration or export.

---

License

This script is covered under the repository’s main MIT License.