FOG unable to PXE boot beyond the VLAN/subnet that the server is on
-
@george1421 said in FOG unable to PXE boot beyond the VLAN/subnet that the server is on:
FOG iPXE menu
So specifically on subnet A where the FOG server is located we see the FOG iPXE menu when any system boots to network card. Everything works great . On subnet B we don’t see the FOG iPXE menu when a system boots to ethernet.
The Fog server is a Ubuntu 18 system it is also the DHCPD server .I have not changed the option 66 or 67.
-
@jape said in FOG unable to PXE boot beyond the VLAN/subnet that the server is on:
The Fog server is a Ubuntu 18 system it is also the DHCPD server .I have not changed the option 66 or 67.
OK now we have a direction. So can you tell me why you are using the FOG server as a dhcp server? Do you have a campus dhcp server or is FOG on a dedicated imaging network.
The question is not as cheeky as it sounds. There are valid use cases for having FOG be the dhcp server, I just want to make sure you have one of those cases.
-
Thanks @george1421
Well, we did not have a separate dhcp server in our environment when we setup FOG. So we used the same server. If this isn’t advisable we can probably move the service to another host -
This post is deleted! -
@jape Just to be clear you did not have a preexisting dhcp server on your site until fog was installed? Not even a router or other device that acted in place of a traditional dhcp server? its a bit strange (I feel) that you would have vlans/subnets without an existing dhcp server.
If this is true, no worries its pretty simple to get the remote subnets to work.
-
@george1421 ok I see. Yes, there is a separate DHCP server serving a separate range within that same subnet. So perhaps that will complicate things
-
@jape said in FOG unable to PXE boot beyond the VLAN/subnet that the server is on:
So perhaps that will complicate things
Yes it will. dhcp works off from broadcast messages, so it communicates by sending out broadcast messages on the same vlan/network. Having 2 dhcp servers on the same network segment will cause you grief.
Fog can integrate into an environment where there is an existing dhcp server no problem. FOG’s internal dhcp server would be typically used if you were to setup an isolated imaging network where there was no device except the pxe booting computer and the fog server.
So lets start out with this, what device is your preexisting dhcp server?
-
@george1421 Thanks. The existing DHCPD server is not adminstrated by us. Its managed somewhere else by another group. I can reserve a certian segment of the range , but thats about it It sounds like maybe it will be simpler to have a separate FOG server in each subnet.
-
@jape Do you have control of your subnet router? If yes can you add a dhcp server (fog server’s IP address) to the dhcp-helper/relay service in the router?
The thought is to provide just pxe boot info we will use dnsmasq. The only thing is if you have multiple ip subnets, the dnsmasq service needs to hear the pxe boot request. It will only provide pxe boot info everything else comes from your main dhcp server. We use this method when the dhcp server can’t be modified or is broken and can’t provide the proper pxe boot info.
-
@rrtern Just wondering, did you create a route between the two subnets? The firewall(s) may also need rules to allow pxe, http, and tftp traffic between those subnets. I didn’t see anything mentioned about routes so that’s why I asked. For instance in pfsense, by default different VLANs can communicate with each other. But at my job’s network environment they have to create routes so that vlans and subnets can communicate.
