[c-nsp] VS broadcast address relaying from Vlan to Vlan

[Peter Rathlev]

Hi Arne,

The Copy+Pasted configuration uses 10.2.40.X as ip helper-addresses, but
the VLANs broadcast-addresses are 10.8.40.X. Is that just a typo? :-)

I have no experience with a setup like that, but can't see why it
shouldn't work though, with the "ip forward-protocol udp 49152".

Regards
Peter

On Mon, 2008-03-10 at 16:47 +0100, Arne Larsen / Region Nordjylland
wrote:
> Hi Folks.
> 
> I hope someone can help me out here. I have a problem with devices from
>  a supplier to our ventilation system.
> There units are IP based, but they aren't very clever units. When the
>  temperature is being propagated to all units the sending device sends
>  it to the broadcast address on its own LAN.
> Furthermore the devices are sending information to each other the same
>  way, by sending to the broadcast address.
> So as long all devices is on the same broadcast domain everything works
>  fine. The units sends to port 49152 udp on the broadcast address.
> But, there can only be 32 units on each broadcast domain for some
>  reason that I'm not aware off.
> So I have to segment it into more VLan on our core switch (its 6500).
> Now, how do I propagate the packets that are sent to a broadcast
>  address on one VLan to all others VLan.
> I've setup helper-addresses for relaying the broadcast traffic to the
>  broadcast address on all others VLan and I've appended port 49152 udp
>  in the forward-protocol.
> 
> Here is the what I've tried to get working, but it's not.
> 
> 
> interface Vlan400
>  ip address 10.8.40.1 255.255.255.192
>  ip broadcast-address 10.8.40.63
> ip helper-address 10.2.40.127
>  ip helper-address 10.2.40.191
>  ip directed-broadcast
> 
> interface Vlan401
>  ip address 10.8.40.65 255.255.255.192
>  ip broadcast-address 10.8.40.127
>  ip helper-address 10.2.40.191
>  ip helper-address 10.2.40.63
>  ip directed-broadcast
> !
> interface Vlan402
>  ip address 10.8.40.129 255.255.255.192
>  ip broadcast-address 10.8.40.191
>  ip helper-address 10.2.40.63
>  ip helper-address 10.2.40.127
>  ip directed-broadcast
> 
> 
> 
> 
> /Arne
> 
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