Re: [MMUSIC] RTSP & NAT: Symmetric RTP

[Magnus Westerlund <magnus.westerlund@era.ericsson.se>]

Hi Tom,

I think this is a good idea, however we will still have the DOS attack 
problems when specifying addresses other then the ones the RTSP 
connection uses. I don't have a good way of solving this.

As you used a description format that is not the ABNF of RFC 2234 I 
converted it below.

> It would seem to me that a new parameter is appropriate.  client_port
> implies that only a port number is given.  Perhaps something like this
> could
> serve as an endpoint specifier with addresses?
>  
client_addr = "client_addr" "=" addr_list
addr_list = addr  *("/" addr)
addr = ip4addr / ip6addr
ip4addr = ip4host [":" port]
ip6addr = ip6host [":" port]
ip4host = hostname / ip4literal
ip6host = hostname / ip6literal
port = 1*DIGIT
ip4literal = <digits and dots>  
ip6literal = "[" <hex quads with colons> "]"

Some small detail questions:
- Should the port range be limited to 16 bit values?
- What are the rules when it would be optional to specify port numbers?

Cheers

Magnus Westerlund 
Multimedia Technologies, Ericsson Research ERA/TVA/A
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S-164 80 Stockholm, Sweden | mailto: magnus.westerlund@era.ericsson.se



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