Question

Using UDP Profiles for PXE Boot

  • 21 July 2020
  • 2 replies
  • 154 views

Userlevel 2

We currently use a UDP Profile for DHCP and DHCP Fingerprinting.

In terms of using it for PXE boot is it just a case of adding a few more lines of text to include the PXE server?

I believe its 4011, pxe port.

see below our current udp profile

entry one {
if match all {
 destination-port 67;
} then {
destination-ipaddress ;
}
}
entry two {
if match all {
 destination-port 67;
} then {
destination-ipaddress ;
}
}
entry three {
if match all {
 destination-port 67;
} then {
destination-ipaddress ;
}
}
entry four {
if match all {
 destination-port 67;
} then {
destination-ipaddress ;
}
}

 

can i just add entry five and specify destination-port 4011 and dest-ip as pxe server IP?


2 replies

Userlevel 3

Hi Ian,

You may also need tftp(udp port 69) as welll depending on the PXE server but that could be also be added as entry 6:

entry five {
if match all {
 destination-port 4011;
} then {
destination-ipaddress ;
}
}

entry six {
if match all {
 destination-port 69;
} then {
destination-ipaddress ;
}
}

 

Thanks,

Chris Thompson

Userlevel 6
Badge

Hi guys,

I’m curious, can someone enlighten me the reason behind this? I know that this will send all DHCP packets to the specified IP-Address… but why? 🙂 Ah DHCP-Request will also find its way to the DHCP-Server without these lines. (If it’s in the same network)

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