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DHCP Option 43
Gepostet von Daniel Riediger an 16 January 2018 14:48

DHCP Option 43 for ZD and vSZ can be calculated as below.

Let us assume 10.10.10.10 is the IP address of ZD/vSZ/SZ, the formula would be.

Sub option (ZD:03) or (vSZ:06) + Length of the IP in HEX + HEX Value of the IP (ASCII to HEX).

Lets apply above formula on IP 10.10.10.10

Sub Option ZD = 03

Length of IP in HEX

10.10.10.10 has a length of 11 or hex value of 0x0b = 0b

Example string length for different IP: 

10.9.52.32 has a length of 10 or hex value of 0x0a
10.10.52.32 has a length of 11 or hex value of 0x0b
10.11.52.32 has a length of 11 or hex value of 0x0b
10.111.52.32 has a length of 12 or a hex value of 0x0c
192.168.100.10 has a length of 14 or a hex value of 0x0e

Hex Value of IP

ASCII to HEX of '1' = 31
ASCII to HEX of '0' = 30
ASCII to HEX of '.'  = 2E


10.10.10.10
31302e 31302e 31302e 3130

The Complete Option 43 Hex for IP 10.10.10.10 with ZD sub option (03) is  030b31302e31302e31302e3130

The Complete Option 43 Hex for IP 10.10.10.10 with vSZ sub option (06) is 
060b31302e31302e31302e3130

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