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DHCP Options with custom Vendor Class

Lantal Georg

Dear All

I have currently the challenge to set up DHCP with Sophos XG V17.

We have DELL WYSE ThinClients and ALCTATEL IPPhones. I know the CLI commands to add DHCP Options to the DHCP Server in XG and it works fine for our WYSE Thinclients.

But I am really struggling with our Alcatel IPphones.


They need custom vendor classes to work - I configured our internal Microsoft DHCP Server with this Guide and it works fine:

http://www.alcatelunleashed.com/viewtopic.php?t=22167

 

Now I need to set up XG DHCP Server for other locations because its not possible to have a Windows Server on those locations.

 

 

How can I create the 3 custom DHCP Options:

058
066
067

With the custom vendor class:  alcatel.noe.0

I think the ip-phones should also work only with custom vendor class option 066 (TFTP-Server) - but I'm not sure.

 

My research showed me, that it should be possible with Option 43 and then sub-options but I was not able to get the correct string to enter into CLI.


Can anyone help me?

 

Kind regards



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  • 0

    This is working for me.  According to Alcatel TC931en:

    In its offer, the DHCP server will add Vendor-Specific information option 43 containing sub option 64 and 65:

    2b0c 40040a090105 41040a090205

    Option 43 (0x2b), length 12 (0x0c)

    First TFTP server IP address: sub option 64 (0x40), length 4, value 10.9.1.5

    Seconf TFTP server IP address: sub option 65 (0x41), length 4, value 10.9.2.5

     

     

    I did this on the XG where my TFTP server is 10.0.0.10

     

    system dhcp dhcp-options binding add dhcpname Voice_DHCP optionname Vendor_Encapsulated_Options(43) value 40:04:0a:00:00:0a:41:04:0a:00:00:0a

     

    40:04 followed by HEX for TFTP1 then 41:04 followed by HEX for TFTP2.