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I setup a gateway to gateway vpn connection with linksys RV042 router. i was able to ping each other, access file sharing ( with netbios enabled ).

They are having same subnet mask 255.255.255.0,

192.168.1.0 <---> 192.168.2.0

Firewall disabled.

But when i created/host LAN games (eg. warcraft3), it cannot be detect by clients at another site/LAN.

As i know warcraft3 is using UDP broadcast to tell the client the game is creaetd. 1. How to broadcast UDP to another LAN ? any things to do with multicast ?

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192.168.1.0/255.255.255.0 is not on the same subnet as 192.168.2.0/255.255.255.0. – Zoredache Jun 30 '10 at 18:58
if not mistaken, if you having different subnet mask 255.255.255.0 / 255.255.255.1 you may require advance routing – user47221 Jul 1 '10 at 17:19
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I don't mean to be rude but you need to know more about IP and Ethernet; whilst 255.255.255.1 isn't an entirely invalid NM is isn't a valid one either. What you have created is two subneta with a tunnel between them and some basic L3 routing, what you wish to achieve is either a spanned VLAN or some form of UDP broadcast relay/helper similar to a DHCP helper. – Chopper3 Jul 1 '10 at 17:33
@user47221, what does that have to do with anything? Please see serverfault.com/questions/49765/… to learn about subnets. – Zoredache Jul 1 '10 at 17:37
i have called cisco support and they said that this router do not support UDP broadcast over vpn. not sure the answer given by xmenehune is working or not, haven't get a chance to try it. – user47221 Jul 18 '10 at 19:04
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most routers by default don't allow broadcasts Chopper is on the right path, your VPN tunnel is up and running and appears to allow 'traffic', but you may need a 'helper' command, normally used to allow DHCP broadcast to cross a router. but i'm unfamiliar w/your router and thus you may also need to add a 'rule' at each end ie. route 192.168.1.0 0.255.255.255 specific interface

and again use this routing command on the other router as well but routing the other way

route 192.168.2.0 0.255.255.255 specific interface

essentially allow 'this network' 'this subnet' 'go to here'

note: using a reverse subnet mask, but your router may want the mask as 255.255.255.0

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