PXE boot

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PXE boot

L2 Linker

I'm trying to get pxe boot to work through the firewall. Now options 66 and 67 are available in palos dhcp server but I can't get it to work anyway.


Besdies normal dhcp options I've setup option 66 with IP and ip-address and option 67 with ASCII and \path\bootfile

I have a sec pol with any any to the sccm server.


All I can see is tftp traffic hitting the gateway, no traffic trying to hit the sccm server at all.


So I'm thinking I've setup the dhcp server wrong.


Any ideas?


L3 Networker

> By any chance are you using DHCP relay ?



I have on other interfaces but here I have a server.

Are you saying that you have configured dhcp server somewhere on your network and firewall is droping some dhcp traffic? I think you need to configure dhcp replay and create proper security policies.

No I'm saying that I've configured Palos own dhcp server with custom options 66 and 67.

Few suggestions that you may try:


> Remove any App Over-ride policy

> Remove QoS if you have it config

Nothing of those in place.


Just to clarify. Client gets ip, dns etc from palos dhcp server. Lease is gw (palo). Option 66 says


Only traffic I can see is udp/69 with destination

Try dhcp option 66 with ASCII and type the hostname of the tftp server not the ip address.

I have already tried that but no go I'm afraid.


Configure only option 66 first and don't configure option 67 check if only option 66 is working or not. Take pcap on the firewall you will get to know if firewall is sending packets with proper option or not.

Did you guys managed to find a solution for this?

Sorry late reply...


No we didn't and it was only for testing purposes so we didn't put that much effort into it.

  • 11 replies
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