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Community Member

Router Configuration for Wake On Lan

We are using WOL successfully on individual segments of our network but cannot wake a PC if it is on a segment other than the management PC.

Our network consists of 2 - 6509's at the core and 40 fiber connected locations running 3500 gear. Each location is run as a VLAN and all routing is handled by the MSM's in the 6509's.

How do the MSM's need to be configured to pass the WOL requests?

3 REPLIES
Anonymous
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Re: Router Configuration for Wake On Lan

WoL is a UDP packet dest. port 9. So try configuring 'ip forward-protocol udp 9' at the global config and 'ip helper-address [WoL server's ip]' on the interfaces clients are connected on your 6509s

Community Member

Re: Router Configuration for Wake On Lan

enabling directed broadcasts you enable your network to the smurf attack!

There is an other trick:

add a static arp with a defined ip for each interface, pointing to the mac ffff.ffff.ffff

eg.

arp 172.16.10.254 ffff.ffff.ffff ARPA

arp 172.16.11.254 ffff.ffff.ffff ARPA

arp 172.16.12.254 ffff.ffff.ffff ARPA

Then you generate the magic packet with a destination 172.16.12.254 and subnet 255.255.255.255

The packet will be delivered to all hosts on the subnet 172.16.12.0/24 and will wake up the PC with the MAC defined in the magic packet.

This solution is NOT subject on the smurf attack because nobody will have the "virtual" IP address and nobody will answer to them!

Community Member

Re: Router Configuration for Wake On Lan

It has been a long while since your post... Have you gotten this to work.

I believe WOL requires directed broadcasts enabled on router interfaces which probably isn't a good thing.

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