Wake on LAN across Layer 3

When setting up WOL across a Layer 3 boundary you have to enter an ' ip helper ' address on the WOL server L3 vlan for each subnet you want to ' wake '.
What if you have 200+ subnets , I'm fairly sure the practical limit for ' ip helper ' addresses is 16 ?

I wonder where the original poster got the idea that the practical limit for ip helper-address was 16? I agree that there is some additional overhead on the router for each helper-address that you add to the configuration. But a router should be able to process a lot more than 16 helper-addresses.
200+ would be a lot of helper-addresses and depending on what kind of router (how much CPU does it have) and what other features are configured doing 200+ might be a stretch. But most routers should be able to do lots more than 16.
HTH
Rick

Similar Messages

Wake on LAN across subnets

Is there a way to get Zenwork's wake-on-lan feature to work across subnets?
I am not a LAN administrator so pardon any ignorance you see in my
question.
Zenwork's wake-on-lan function won't work on our LAN because our switches
are set to not allow forwarding of subnet-oriented broadcasts, which is a
generic requirment for zenworks wake-on-lan function to work. Our security
folks say enabling this on the switches is not an option because it
introduce a security vulnerbility. I find it strange that there wouldn't
be a solution for this by Novell/Zenworks considering that multiple
subnets, switches, and security considerations are usually a component of
all networks which zenworks is specifically targeted for in the first
place.
Thanks

Originally Posted by Marcus Breiden
On Thu, 07 Sep 2006 22:52:59 GMT, [email protected] wrote:
[color=blue]
it is the only way though.. that's how any WOL software works.. they can
limit the packets comming from either your c1 wks or the zenworks server
though.. otherwise you would require one server per subnet
Marcus Breiden
If you are asked to email me information please change -- to - in my e-mail
address.
The content of this mail is my private and personal opinion.
Edu-Magic.net, deceased
Exactly, and this is the best choice. Make "Replication Servers" in each subnet, is very simple. U can use a Windows machine or SuSE, both without installing zenworks. Only registering them as servers satellites. You must install the agent (logically, hehe).

SG200 how to configure Wake on LAN across subnets

How can I configure to support WOL on a SG200 (8 Ports) to support Wake On Lan (Magic Packets) from a different IP Subnet or other SG200 Switch. It seems not to support Directed-Broadcasts.

I checked out the link and tested the changes. Unfortunately, the WOL still won't work. In the link you attached, it states that you cannot turn on a computer that is off. Does that mean one that is off such as unplugged or in shutdown? Also, one of the steps to configure the firewall access rules says to block all outbound connections for all services. That doesn't make any sense to me, but I might be wrong. I also noticed that the link was for another router. I don't know if that makes a difference. I also read somewhere in the forums that someone else is having a similar problem, saying that Port Forwarding still isn't working in the latest firmware. This whole problem is strange because it used to work all the time on my old router with Port Forwarding, but on this one it won't work at all.
Sent from Cisco Technical Support iPad App

Macintoshes on heterogeneous networks - wake on lan

Hi All,
I've been setting up a couple of Macintosh labs this summer, using Intel based iMacs running Mac OS 10.5 (Leopard). I've purchased Apple Remote Desktop to allow me to manage all the Macs from my office. The one problem I've run into that I can't fix is waking up the Macs across our network after they've gone to sleep. Our (Windows-based) DHCP server sees the Macs go to sleep and then disconnects them from the network; so my directed broadcast WOL (Wake on LAN) packets fall in the bit bucket. Our computer center folks say there's a fix for this, but they won't do it because they claim it opens up our entire network to a distributed denial of service attack. My workaround is to never let the Macs go to sleep - which I hate because when idle they draw 48W of power each, and when asleep only 2.4W.
Anyone out there have a heterogeneous network that allows Macs to safely sleep?
thanks,
john

hehe, yeah I've been through this and feel your frustrations. Grrrrrrrrrrrrrrr
Here is your answer!!!
Control Panel>System>Hardware>Device Manager>Network Adapter>>> Select the netowrk adapter, right click and select Properties. Select the Advanced tab and then go down the list and look for "Wake on Settings">on the right select disable.
It should not "Turn On' randomly now.
Cheers,
Michael

Wake on Lan feature

More of a comment then a query but I'm amazed that the WOL is not implemented correctly. Very frustrating that it only works when a system is in sleep mode. If a PC is off it can be woken up, so why Apple chose not to allow this is beyond me.
This means if I need to image some systems I have to go and switch each one on manually. I'd chose to have each systems default boot-device as the network card so if no netboot foud it'd go and boot off the HDD.

Wake-on-LAN is implemented correctly, in that a sleeping Mac can be awakened by a signal across the network. What you want is Boot-on-LAN, and that's never been a feature of Macs (at least not any I can remember, back to the original Mac models) with the exception of the Intel-based Xserves. But you can submit your comment to Apple via their feedback pages:
http://www.apple.com/feedback

Wake on LAN - ip directed broadcast

We're looking at deploying a Wake-on-LAN solution for software distribution. The first alternative to distribute the 'magic packet' is enabling 'ip directed-broadcast' in each router, which presents a security risk (man in the middle attack, ARP table poisoning), the second alternative is to extend ARP aging time in the routers which presents the same security risk.
My question is, how can be this security risk reduced or minimized (options I've heard of: 'dynamic ARP inspection' in the switches, ACL on the router associated with the ip directed-broadcast command allowing only software distribution servers to convert directed-broadcast packets into unicast packets). I have a concern extending ARP aging time and its impact with current or future application.
I'll appreciated any comment. Thanks.

IP directed broadcasts are used in the popular "smurf" denial-of-service attack and derivatives thereof. An IP directed broadcast is a datagram that is sent to the broadcast address of a subnet to which the sending machine is not directly attached. The directed broadcast is routed through the network as a unicast packet until it arrives at the target subnet, where it is converted into a link-layer broadcast. Because of the nature of the IP addressing architecture, only the last router in the chain, the one that is connected directly to the target subnet, can conclusively identify a directed broadcast. Directed broadcasts are occasionally used for legitimate purposes, but such use is not common outside the financial services industry. In a "smurf" attack, the attacker sends Internet Control Message Protocol (ICMP) echo requests from a falsified source address to a directed broadcast address, causing all the hosts on the target subnet to send replies to the falsified source. By sending a continuous stream of such requests, the attacker can create a much larger stream of replies, which can completely inundate the host whose
address is being falsified. If a Cisco interface is configured with the no ip directed-broadcast command, directed broadcasts
that would otherwise expand into link-layer broadcasts at that interface are dropped instead.
If you are behind a firewall and are confident in your security policy, then I don't see this as being a problem.

Wake on Lan not working properly?

So as far as i'm aware Windows 8 supports wake on lan whilst the device is either in sleep or hibernate (not completely off) and so far it works fine when in sleep mode (no randomly turning on like lots of people have been saying) but nothing happens when in hibernate. Is there any particular reason why this may be?
Lenovo G780
Windows 8.1
Using unified remote (full) to control power options (tried in both administrative and not)
Qualcomm Atheros AR8162/8166/8168 PCI-E Fast Ethernet Controller (NDIS 6.30). Set to recieve packets
and i think i've made all of the nessasary changes to BIOs and my router (Belkin) to allow WoL (seeing as it works when sleeping)

Hallo Forumreaders,
WOL (Wake On Lan) works only through a router when it is capable to forward to broadcast LAN-IP-adres.
In my consideration only the good old BEFSR41 is capable to forward to the broadcast adres for example 192.168.1.255 (SM: 255.255.255.0)
Because there is no IP-adres in powerless PC's the "Magic Packet" (which WOL realy is) MUST be send onto your LAN by means of the broadcast-adres.
Other routers are NOT able to sumit a adres like 192.168.1.255 in a subnet of 255.255.255.0 because they are NOT allowed to use any broadcast-adres.(they can get trouble by means of a broadcaststorm!!!)
So do not get rid of that old router you have!!
More info;
The "Magic Packet" contains the MAC-adres of your recipient host and wil trigger the powersupply of that PC.
For Internet WOL, try http://www.dslreports.com/wakeup, submit your IP-adres of your home, your MAC-adres of your PC and klick on "Wake up".
Looking for an application for on a USB-stick, download the small tool; http://www.depicus.com/wake-on-lan/wake-on-lan-gui.aspx
Hope I helped,
Greetings
Message Edited by R.J. on 02-11-2010 02:04 PM

Wake on Lan works on my MacBook Pro, not on my iMac...

Hello everyone, with all these threads about the problem, I wanted to start a new one to make it clear, with all information you may need in order to help me out.
I've got a MacBook Pro '15 and an iMac 21.5', both are running (clean install) OS X Mountain Lion 10.8.2, both are up to date with the latest updates, both have the same apps, both have the same settings in "system preferences", and of course the same settings in "sharing" options.
My iMac is connected to my 5GHz network from my Time Capsule while my MacBook Pro use the 2.4GHz network.
Before going to bed, I leave both my Macs turned on, after 10min they go to sleep automatically. In the morning I can wake up my MacBook Pro from my iPhone or iPad with a screen sharing app.
The iMac doesn't respond at all. It stays in sleep mode. I can leave my MacBook Pro asleep for a week, it always responds. The iMac responds after a few hours but after 6 or 8 hours it seems to be completely asleep and doesn't respond to anything. If you think it's about the iPhone/iPad's app, when I try to wake the iMac from my MacBook Pro with "Back to my Mac" I have the same results.
I tried to connect my iMac to the 2.4GHz network: same problem.
OF COURSE "WAKE ON LAN" is activated in my system preferences.
I made a reset of the PRAM, the cache and the SMC on my iMac: same problem.
I type sudo periodic daily weekly monthly in the terminal and sudo dscacheutil -flushcache: same problem.
I tried everything I may have found in the forums or on this Support from people having the same issue: same problem.
I even tried to set the iMac with the same sleep mode as my MacBook Pro: same problem.
PLEASE HELP ME!

loïcfernandezcastrillon wrote:
I'm connected with the WiFi of my Time Capsule (bridge mode). I have this configuration since Snow Leopard, and no troubles...
I understand that, but if your router is not an Apple AirPort Base Station then it introduces an element of uncertainty. Apple has implemented many changes related to wireless networking recently.
You are complicating matters by changing networkoversleep:
networkoversleep - this setting affects how OS X networking presents shared network services during system sleep. This setting is not used by all platforms; changing its value is unsupported.
Solving problems like this requires that you simplify your network environment and eliminate its unknowns. Using third party routers and making unsupported changes runs counter to simplification.
The iMac stays connected to the Time Capsule about 6 hours during sleep. Then it dissapears...
The iMac wakes periodically (every few hours) to inform your router of its network presence for Wake on LAN demands. Try changing your router's DHCP lease period to something longer than a few hours. For a home environment, a few days is more appropriate. This may not solve the problem, but it is better than making unsupported changes to your system.

HP Color LaserJet CM1312nfi MFP Mystery Wake on LAN

The printer wakes unexpectedly, and unpredictably on the network. I cannot determine what, if anything, is waking it. The printer wakes and goes into calibration without any users on the network and without any print jobs. Mystery wake on LAN.

The HP drivers won't load on my 10.10.x (10.10.1 thru 10.10.4) OSX macbook pro. The install says the version of OSX isn't supported even thought I've tried 1.5.0 dmg file which is for 10.7 and greater. I did the math and I believe 10.10.x is greater than any version of 10.7. I also tried HP Easy Scan and it doesn't even see my scanner. Printing works fine, but I scan a lot of paper. Also, I've found that the Mac OSX version of the HP software (when it still worked) creates obscenely large PDF files. I can get around this by opening Adobe Acrobat Pro and re-saving the file as a reduced file size with the same name. I can take a 25 MB file HP creates and get it down to about 300KB or so. I found a way around all this but you won't like it. I've loaded Parallels (installed windows 7 ultimate 64 bit) and installed the windows client in my parallels image. The windows client works fine. Not a solution I prefer, but this is an HP issue not an apple issue .... HP hasn't put out a driver for this printer in the better part of 3.5 years. Lastly, I'm not hooking up a USB cable to my printer/fax/scanner .... what's the point of having a dhcp network capable printer if I have to hard wire to a PC? I've used HP printers since the mid-'90s, but I guess it's time to find a company that supports OSX.

T500 Wake on Lan (wireless) does not work.

Hi,
I set up T500 (Windows 7 Ultimate 64bit) for wake on lan,
1) Enable Bios WOL
2) Enable WOL in power manegement tab of Intel WiFi Link 5300 AGN property in device manager.
But WOL does not work. Sending magic packet from a PC in the same WiFi segment does not wake up sleeped T500.
Are there any setting for WOL in lenovo tools ?
Does anybody use WOL(WiFI) on T500?
Thanks,

Is the T500:
Associated with an access point at the time it is put into standby/sleep mode?
Connected to AC power for the whole time it is in standby/sleep mode (in otherwords the whole time it is in a low power state) when you are attempting to use WoWLAN?
If not, that may be at least part of your problem, as it is a known limitation on WoWLAN operation.
You also need to have the laptop "set up" to the master workstation, and the WLAN configured to handle braodcast wireless frame, but I am presuming you have already done that side of things.
Cheers,
Bill
I don't work for Lenovo

Satellite C660 - how to enable and Use WAKE ON LAN?

Hi All,
I previously posted asking about using Wake on Wireless LAN and was very helpfully advised that this was not possible, so I have started to explore the Wake ON LAN option.
I have a Toshiba C660 PSC0LE-00500JEN and have enabled Wake ON LAN on the BIOS, and have connected a LAN cable between my wireless router and the laptop, both of which recognise each other so the cable seems ok.
However, whether I use a WAKE ON LAN app on my android, or I use an online "wake on lan via browser" site, the laptop still remains asleep.
Can anyone advise?
Thanks
James

Hi
The Wake Up on Lan option would work if you would send an Magic Packet to the remote machine (notebook).
I have no experience using the Android app who knows if it function properly
Try other method. For example using an software like Wake on Lan for Windows Graphical User Interface (GUI)
Google for that to download this software.
Furthermore go to device manager -> LAN card -> Properties -> Advanced tab and check here if the WOL is enabled too

Wake on lan - I can't get it to work

Sorry for the nubie here.
I am unable to wake my new iMac from my Macbook using WakeOnLand. The MB is using wifi and the others are using ethernet.
Also, I am unable to see a G4 running 10.4.11.
The MB and iMac are running 10.6.2. No firewalls.
I have a Dlink router and know how to get into its admin page but really am afraid to change its configurations due to lack of knowledge.
Any help appreciated.
Lewis

no. wake on lan works over ethernet only. it does not matter what router you use. but SNow leopard has a new feature "wake on demand" that does work over wireless. but for that you need a very recent apple router (TC or AEBS) and and a very recent computer.
http://support.apple.com/kb/HT3774

Can't get wake on lan to work on Hp n40l microserver

Hello
I installed arch on my HP proliant microserver and I can not get Wake on lan to work. I tested my device with ethtool and it supports and is enabled for WOL with g value set for both.
But whenever I power it off by systemctl poweroff I can no longer see it as a connected device to my router
Before installing arch I tried ubuntu for testing the hardware quickly and I got wake on lan working there. I can not figure out what might be the issue here. Wake on lan is enabled in the BIOS.
Any help would be appreciated
Cheers

As I see in the Archwiki , the wol package would also need the IP address ( though not necessary ) along with the mac address of the server.
I fear that the nic on the server does not obtain an ip in shutdown state, since I can't see it in my attached devices in the router settings( I could be very wrong ! )
Tried using wol on a laptop running arch, but with no luck.
I have seen this workaround in several places
https://bugs.launchpad.net/ubuntu/+sour … bug/981461
I even tried creating a similar script which would first do
ip link set dev enp2s0 down
systemctl poweroff
but that did not work either.
Cheers
Last edited by ayushjsh (2013-04-03 07:00:28)

Wake on Lan (works, but not always)

Iam trying to get Wak on Lan working on my iMac. It works, but not always. When I put my mac to sleep en send the magic package, my mac turns back on. But when my mac turns to sleep and I wait a few hours (the next morning), my Mac doesn't respond to the same magic packag. When I wake up the Mac by hand, and put it back to sleep again, the magic package works again en turns the mac on.
It almost looks like the mac goes into a deeper sleep mode after a few hours. Does anyone knows what could ben the reazon.

mmm, It seems like my mac doesn't always turns to sleep mode. Most of the time it only turns off the screen (solid light). My energy settings are 10 minutes for the screen and 15 minutes for the mac. But after turning of the screen it never turns to sleepmode. Ecxept when I put it to sleep manualy.
Strange thing is: when the screen is turned of, shouldn't I be able to get tot my files... (I can't actualy).

Wake on LAN/Keyboard wake for a K8N Neo Platinum - how do I use this?

I've got a K8N Neo Platinum motherboard that I am using in my home theater PC and I was hoping to enable either the wake on lan or keyboard wake functions so that they could be controlled via a remote control. For now disregard what the overall outcome I want to achieve is... what I want to know is if enabling the WOL and/or keyboard wake function will allow me to turn on the PC from a completely powered down state as opposed to just powering up from a sleep/hybernation mode. I have read people with other motherboards have been able to power up by using their keyboard, mouse or even WOL when the computer is totally shut down. I'm trying to avoid leaving the PC in a sleep/hybernation mode due to electricity usage. Does this motherboard have the ability to power up when the whole system is shut down?
Also, what key on the keyboard is used to wake up the computer? The manual and bios instructions say nothing about what key needs to be pressed to wake it up.

I know you can set various wake options in the bios. Check there!
You can wake up the computer by wriggling the mouse or pressing any key, if the options are enabled in the bios.
Hope this helps

Wake on LAN across Layer 3

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