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Configure DHCP Option 120 using FQDNs
03/26/2020 
16 People found this article helpful
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Description
This article explains the steps to follow in order to configure DHCP Option 120 using FQDNs
Resolution
DHCP option 120 can be configured as follows:
- Decimal Values
Select "120 (SIP Servers DHCP Option)" for "Option Number"
Select "Option Array"
Select "One Byte Data" for "Option Type"
Enter the following string 0; 7; 101; 120; 97; 109; 112; 108; 101; 7; 101; 120; 97; 109; 112; 108; 101; 3; 99; 111; 109 as option value (decimal value for example.example.com)
- HEX Values
Select "120 (SIP Servers DHCP Option)" for "Option Number"
Select "Option Array"
Select "One Byte Data" for "Option Type"
Enter the following string 0x00;0x65;0x78;0x61;0x6d;0x70;0x6c;0x65;0x2e;0x65;0x78;0x61;0x6d;0x70;0x6c;0x65;0x2e;0x63;0x6f;0x6d;0x00 as option value (decimal value for example.example.com)
Note: The domain name needs to be converted first (split domain name and then convert to ASCII value)
To use more domain names of SIP Servers (i.e. sip.dell.com, domain.test.com)
- Convert the domain names
- sip.dell.com is 3, 's', 'i', p', 4,'d', 'e', 'l', 'l', 3, 'c', 'o', 'm' 0 is 037369700464656c6c03636f6d00
- domain.test.com is 6, 'd', 'o', 'm', 'a', 'i', 'n', 4, 't', 'e', 's', 't', 3, 'c', 'o', 'm', 0 is 06646f6d61696e047465737403636f6d00
- Concatenate the two strings and add "00" first.
- So, the result is:
Option Type:Hex String
Option Value:00037369700464656c6c03636f6d0006646f6d61696e047465737403636f6d00
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Categories
- Firewalls > TZ Series
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- Firewalls > SonicWall SuperMassive 9000 Series
- Firewalls > SonicWall NSA Series
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