<row><entry>Option Hex</entry><entry>option[code].hex</entry><entry>The value of the option with code "code" from the packet as hex</entry></row>
<row><entry>Option Exist</entry><entry>option[code].exist</entry><entry>If the option with code "code" is present in the packet "true" else "false"</entry></row>
<row><entry>DHCPv4 Relay Agent
-sub-option</entry><entry>relay[code].hex</entry><entry>The value of
-sub-option with code "code" from the Relay Agent Information option
+sub-option</entry><entry>relay4[code].hex</entry><entry>The value of
+sub-option with code "code" from the DHCPv4 Relay Agent Information option
(option 82)</entry></row>
</tbody>
</tgroup>
</para>
<para>
- "relay[code].hex" attempts to extract the value of the sub-option
- "code" from the option inserted as the Relay Agent Information
+ "relay4[code].hex" attempts to extract the value of the sub-option
+ "code" from the option inserted as the DHCPv4 Relay Agent Information
(82) option. If the packet doesn't contain a RAI option, or the RAI
option doesn't contain the requested sub-option, the expression returns
an empty string. The string is presented as a byte string of the