Hi everyone,
We've a client/server application based on a Sybase database. It's parcel software of DHL called Easylog 6.1.
The client app needs to connect to a DB server.
When the client and server are on the same vlan, everything works fine. But i need to seperate them by vlans.
Wireshark reveals that the software uses UDP broadcasts to search for the server. the client issues the start:
source Destination Protocol Source port Dest. port
192.168.21.4 192.168.21.255 UDP "different everytime" 2638
When they're connected, the transmission is done over TCP.
Information:
UDP port: 2638
client vlan: 192.168.21.x /24
DB server: 192.168.2.8 /24
I've tried with IP-helper address 192.168.2.255 on the receiving inteface, in conjunction with ip forward-protocol UDP 2638 - Doesn't work.
When i do ip helper-address 192.168.2.8 there's udp communication between the client and server, but the source UDP port changes everytime. - doesn't work also.
i've tried with IP-directed broadcast, but i'm not sure how to build the ACL regarding the source and destination, and where to place it...
The story about UDP flooding specified in this link
http://www.cisco.com/en/US/docs/internetworking/case/studies/cs006.html
i don't really understand.
Someone have experience with this?
thanks in advance
