[Cerowrt-devel] Routed LANs vs WOL & Windows troubles

Dave Taht dave.taht at gmail.com
Sun Apr 12 17:57:59 EDT 2015

You are right that you can achieve the roaming better with bridged, in
all the scenarios you mention below. Some of these problems are
solved, others not.

On Sat, Apr 11, 2015 at 10:01 AM, Kevin Darbyshire-Bryant
<kevin at darbyshire-bryant.me.uk> wrote:
> Chaps,
> Newcomer to Openwrt & the Cerowrt concepts so bear with me.  I've built
> an Openwrt environment based on Archer C7 hardware and 'Cerowrt'
> principles of 'Routed LANs' for GigE LAN, Wireless LAN1 & Wireless
> LAN2.  I get the design idea of limiting broadcast/multicast traffic on
> the wireless LANs however for a vaguely technical home I'm hitting
> problems that make things 'just not work', to the extent of thinking
> about going back to bridged LAN/WLAN.  So the 3 problems in ascending
> order of annoyance/confusion.
> 1)  I've a central Windows based Home Server (WHS) with a Wake On Lan
> facility - it dozes until a client appears on LAN/WLAN, sends a WOL
> Magic packet.  Unfortunately the WOL Magic packets don't cross subnets
> and the vast majority of clients are of the wireless variety.  Some sort
> of WOL forwarding/proxying on the router would seem the way to go.  Has
> anyone been here/solved it already?

> 2) I have a 'WSD' printer/multifunction device on the LAN, an Epson
> something or other.  It can communicate across subnets (ping) without
> issue but it always appears 'offline' as a WSD printer.  I can use the
> scanner functionality no problem at all :-)

in cerowrt we used multicas
> 3) Windows and its firewall.  Windows likes its firewall on.  It only
> likes to talk to things on the local attached subnet.  Windows by
> default won't reply to pings across subnets and it certainly doesn't
> like doing file sharing.  It would be wonderful if there was a nice easy
> way (via DHCP?) of telling it 'trust 172.30.42/24' (or even my IPV6
> equivalent /56)  Has anyone else fallen in to this?  Solved it?
> 4) (A bonus Monty Python question)  I've a second wireless access point
> at the other end of the garden, attached by a suitable length of Cat 6.
> Devices at mid travel point ideally roam from House wifi to Shed
> wifi...but now they change IP address as well.  To be honest I'm not
> sure how this actually works in a bridged environment either since the
> MAC now migrates from local wireless bridge interface to local wired
> interface and potentially back again as I wander around the garden...how
> does it really know where to send frames to this magically roaming device?
> It appears a lot of 'it just works' functionality is designed for
> bridged LAN/WLAN scenarios and hates routed but maybe I've got the wrong
> end of a stick.
> Thanks for your time,
> Kevin
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Dave Täht
Let's make wifi fast, less jittery and reliable again!


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