Multicasting on Different Subnet

[AKSHAY JAIN]

Hi Dannis,

I was trying to multicast a file to a host in different subnet but in the same enterprise network. In this case Server is announcing but it is not getting any response from the receiver.

can you help me in this I am trying this from a bit long.But getting failure.

[Dennis Bush]

On the sender side, you need to use the -t option to make sure the TTL is set high enough to traverse the routers between the server and the client.

Those routers also need to be configured to allow multicast traffic to pass between them, which is unlikely. If that's the case, you would have to set up a server proxy / client proxy pair to tunnel multicast over a unicast link.

[kuldeep choudhary]

Hi Dannis, could you please help us to provide some project link on uftpproxyd. We are unable to make server client syntex.
Also do you please help me to reduce the NAKs on uftp (Server) and uftpd (client daemon) . I am trying to multicast 4gb file but its taking much time due to NAKs problem.
I am using below syntex for the same.
./uftpd -B 7355555 -p 9092 -d -D /tmp/dest -T /tmp/receiving --- on Client
./uftp -R 99999 -B 7355555 -p 9092 -t 5 <package path=""> --- on Server</package>

[Dennis Bush]

The usage of the proxy is documented in the included man page, as well as on the main website at http://uftp-multicast.sourceforge.net/proxy_usage.txt

[kuldeep choudhary]

Thanks for you quick response, Is there anything i am missing on Server client side?
Also do you please help me to reduce the NAKs on uftp (Server) and uftpd (client daemon) . I am trying to multicast 4gb file but its taking much time due to NAKs problem.
I am using below syntex for the same.
./uftpd -B 7355555 -p 9092 -d -D /tmp/dest -T /tmp/receiving --- on Client
./uftp -R 99999 -B 7355555 -p 9092 -t 5 <package path=""> --- on Server</package>

[Dennis Bush]

The sender will run at exactly the rate you specify, regardless of other traffic on the network. Assuming your network is 100Mbps, you have the sender running at full link speed. If there is any other traffic on the network, that could cause losses.

Try reducing the transmission rate a little bit at a time until you see less NAKs.

[Vincent Boidyo]

Hello Dennis Bush,

I'm trying to multicast between two different networks(Figure 1 from uftpproxyd man page) and we are using uftpproxd utility. But unable to achieve the packet transfer.
Below are the commands on all 4 machines, please suggest where are we going wrong?
Server: ./uftp -R 99999 -B 7355555 -p 9092 -t 10 (file to be transfered)
ServerProxy: ./uftpproxyd -s (ClientProxy IP) -M (Pub Multicast addres:232***) -S (Serverlist file(consisting Server Hexa value, IP Addr)) -t 10 -p 9092
ClientProxy: ./uftpproxyd -c -S (Serverlist file(consisting ServerProxy Hexa value,IP Addre)) -C (Client List File(consisting of Clients' Hexa value)) -t 10 -p 9092
Client: ./uftpd -B 7355555 -p 9092 -d -D /tmp/dir1 -T /tmp/dir2

Apart from port, request you to check also syntax of all the four systems' commands and suggest.