Re: [dccp] DCCP & port randomization

[Pasi Sarolahti]

On Jan 31, 2010, at 1:51 AM, Fernando Gont wrote:

Similar to TCP, DCCP is also connection-oriented and has a LISTEN  
state
for server sockets. I also believe that implementations use the  
socket
API for opening server DCCP sockets in a similar way that TCP does,  
so
many issues are probably similar. But there is a relevant difference:
DCCP service codes are intended to allow more flexible allocation  
of the
ports, or even sharing a port by multiple applications.

Is that mandated by the specs? IIRC, when I reviewed Gorry's
dccp-service-codes I-D (now RFC5595), it was still open what to do  
with
services codes.

Yes, I think RFC5595 says that sharing a port for multiple SCs at a  
server should be possible, and it also proposes an algorithm on how to  
pick a dynamic port based on service code.

- Pasi