All,
If it helps here is a link that has some good information on WOL. There
is a link to AMD in the online references, that has a white paper that
breaks down actual frame, and discusses network and platform issues with
WOL. One section describes how the engineers at IBM used the subnet directed
broadcast for WOL. We don't incorporate the feature at our sites. But I
might try to tinker with it in the lab after reading the posts (peaked my
interest).
http://gsd.di.uminho.pt/jpo/software/wakeonlan/mini-howto/wol-mini-howto.htm
l#toc4
Aloha
Shawn
----- Original Message -----
From: "Priscilla Oppenheimer"
To:
Sent: Friday, June 15, 2001 4:26 PM
Subject: Re: wake on lan [7:8792]
> The "no ip directed-broadcast" command is for IP, as you can tell. If you
> don't see that command in the running config, then ip directed broadcasts
> are presumably being forwarded. A directed broadcast is one that comes
from
> a device on one segment and is destined to all devices on another network,
> for example 10.0.0.1 sending a frame to 172.16.255.255.
>
> But it sounds like ip directed broadcasts won't do you any good because
> Wake on LAN isn't an IP packet.
>
> To make the router forward a broadcast that has no network layer you would
> have to turn on bridging.
>
> Priscilla
>
>
> At 06:40 PM 6/15/01, khramov wrote:
> >As far as I know WOL layer 2 broadcast, it does not have an IP field.
> >That is the main problem.
> >What is the command to look up if direct-broadcast is already enabled on
the
> >router?
> >Thanks,
> >
> >Priscilla Oppenheimer wrote:
> >
> > > One other thought: The article that Patrick referenced implies that
you
> > > could enable directed broadcasts. The default on modern routers is no
> > > directed broadcasts but you could disable that. It's not recommended
for
> > > security reasons, but if you want to do it the command is "no ip
> > > directed-broadcast."
> > >
> > > http://esupport.ca.com/public/sdo_shipit/infodocs/7065.asp
> > >
> > > But you have to find out what the server or whatever is sending to
wake
> up
> > > the stations. You are troubleshooting in the blind until you find out
> what
> > > it is sending.
> > >
> > > Is it an IP packet?
> > > Is it a UDP packet?
> > > Is it just a MAC packet?
> > > Is it a broadcast? At the MAC and IP layers?
> > >
> > > Priscilla
> > >
> > > At 05:58 PM 6/15/01, Priscilla Oppenheimer wrote:
> > > >The "ip helper" command might help.
> > > >
> > > >Also use the "ip forward-protocol" command to forward the Wake on LAN
> > > >broadcast and the "no ip forward-protocol" command to not forward
other
> > > >broadcasts.
> > > >
> > > >You would have to check the documentation to see if this would work
for
> > > >sure. Let us know how it goes! Thanks.
> > > >
> > > >Priscilla
> > > >
> > > >
> > > >
> > > >At 03:31 PM 6/15/01, khramov wrote:
> > > > >I think that wake on lan sends out a broadcast with FFFFF... in the
> > > > >destination field.
> > > > >May be because it a layer 2 broadcast it is not passing the
packets.
> > > > >Can I configure a router to pass layer 2 broadcasts? And if I can
is
> > > > >there a way to
> > > > >control the broadcast so that only wake on lan packets would pass?
> > > > >Thanks
> > > >
> > > >
> > > >________________________
> > > >
> > > >Priscilla Oppenheimer
> > > >http://www.priscilla.com
> > > ________________________
> > >
> > > Priscilla Oppenheimer
> > > http://www.priscilla.com
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=8850&t=8792
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