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TCP/UDP broadcast forwarding

By Redheat ·
Hello!
Is there a way to forward TCP and UDP broadcasts over subnets with the help of software/WinNT server?
What I want to do is the following: I want to forward the broadcasts DirectPlay is doing on port 47624 when it is searching for game sessions (please correct me if this is wrong). The problem is that many newer games don't allow the user to specify the IP of a game server but instead rely on the auto-search of DP which makes them unplayable if the game host is located in another subnet.

I would appreciate any hint you can give.
Many thanks in advance.
Regards. M.F.

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TCP/UDP broadcast forwarding

by pete.zerger In reply to TCP/UDP broadcast forward ...

On the server in the Network Properties icon, select TCP/IP, hit properties, and then on the Routing tab check the box next to 'enable IP forwarding'. Then the server acts as a router that will forward all IP traffic.

Make sure there aren't any dedicated routers between you (like Cisco routers, etc) as normal routers drop broadcasts by default.

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TCP/UDP broadcast forwarding

by Redheat In reply to TCP/UDP broadcast forward ...

The question was auto-closed by TechRepublic

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TCP/UDP broadcast forwarding

by infosec-poc In reply to TCP/UDP broadcast forward ...

I do not believe that turning on IP FORWARDING will do what you want. That function is for routing packets, not forwarding broadcasts.

If you have a cisco router routing between subnets, try the following:

#1 go into enable mode on the router and then go to each interface that you want to forward broadcasts and type in the command "ip directed-broadcast"

#2 if you know where the broadcasts should be sent "ip helper-address x.x.x.x" with the sister statement "ip forward-protocol udp 47624". These commands have to be placed on the interface that will 'hear' the broadcast.

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TCP/UDP broadcast forwarding

by Redheat In reply to TCP/UDP broadcast forward ...

The question was auto-closed by TechRepublic

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TCP/UDP broadcast forwarding

by clpadmin In reply to TCP/UDP broadcast forward ...

Hum, this is a longshot but..

you can try and modify the route table,
i.e. route -p add 192.168.1.255 mask 255.255.255.255 192.168.2.1

and

route -p add 192.168.2.255 mask 255.255.255.255 192.168.1.1

where 192.168.1.1 and 192.168.2.1 arethe addresses for each network card on the Windows NT that does the routing.

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TCP/UDP broadcast forwarding

by Redheat In reply to TCP/UDP broadcast forward ...

The question was auto-closed by TechRepublic

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TCP/UDP broadcast forwarding

by Redheat In reply to TCP/UDP broadcast forward ...

This question was auto closed due to inactivity

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