Wake on LAN on Different LAN Segments

[Guest]

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

Does anyone know if it is possible to use Wake on LAN with PC's on
different IP subnets?

I am using Dameware NT Utilities' Wake on LAN feature to test this out.
I know WOL works fine for two PC's on the same subnet, but it does not
seem to work for PC's on different subnets.

If it is possible to use WOL on different subnets, do the routers,
switches, etc. have to be configured a particular way e.g. certain TCP
or UDP ports have to be opened up?

Any help is appreciated.

 

[Guest]

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

Previously explorerzip@canada.com wrote:
> Does anyone know if it is possible to use Wake on LAN with PC's on
> different IP subnets?

> I am using Dameware NT Utilities' Wake on LAN feature to test this out.
> I know WOL works fine for two PC's on the same subnet, but it does not
> seem to work for PC's on different subnets.

> If it is possible to use WOL on different subnets, do the routers,
> switches, etc. have to be configured a particular way e.g. certain TCP
> or UDP ports have to be opened up?

> Any help is appreciated.

1. Off-opic
2. WOL is by a special ETHERNET packet. The standard does not allow
you to use this from a different broadcast domain. This is also
sensible, because otherwise anybody in the world could swicth on
you machine.

However AFAIK some Ethernet cards are too dumb to check whether
the WOL pattern was actually sent to them, so any UDP packet
with the right MAC pattern in it can be used to switch them on,
i.e. if you send a WOL packet to some other machine (or maybe the
broadcast address) on the target network via UDP that had the WOL
payload for the machine you want to switch on, it might work.

Arno