we need to set the additional helper-address for the RIS server(s).
The reason is that the PXE process uses DHCP messages to reach also the PXE server (RIS server).
spanning-tree portfast is also needed on the port.
We do this on demand: the field technician that needs to rebuild a PC on site first tries to perform a PXE boot, if it doesn't work it he/she calls the NOC asking for it.
To be noted that in case of remote branch offices with low speed links can be faster to carry the PC to a bigger better connected office: we have been reported of an 18 hours time to rebuild a PC that was in a branch with only an IPSEC vpn connection to the intranet.
There was a recent thread where possible issues when DHCP snooping is enabled have been analyzed.
There was a bug in first DHCP snooping implementations that caused issues with PXE.
We're using Microsoft RIS and had problems when the IP Helper on the VLAN pointed to a host address. We changed the IP Helper so that it pointed to the destination subnet broadcast address and it worked a treat.
From the sniffer traces we did it would appear that for RIS to respond to a PXE request both the DHCP server and the RIS Server have to "hear" the request. The DHCP server repsonds with an address and the RIS server responds with a PXE reply that carries a NULL ip address.
If RIS is running on the same server as DHCP then you'll be OK with the IP helper pointing directly at the host address.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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