Solution #00004189
Scope:
All Barracuda SSL VPN products firmware 1.3 and earlier.
Answer:
“Wake on LAN” (WoL) requires the network hardware (MAC) address of the
destination computer. The Barracuda SSL VPN automatically detects the MAC
addresses of local machines by looking at the SSL VPN's local ARP cache. However
ARP is a broadcast-only protocol, meaning ARP packets only reach within the
local subnet.
If the SSL VPN is installed in a DMZ environment, most WoL resources
will likely to be on another subnet, and beyond the SSL VPN’s ability
to determine the MAC address of the requested WoL resource.
The WoL protocol itself also does not route across subnets, so even if MAC
addresses are manually entered, WoL resources outside the local subnet will
still not receive WoL packets.
Link to this page:
http://www.barracuda.com/kb?id=50160000000HmeN