Re: [Int-area] I-D Action: draft-shen-traceroute-ping-ext-04.txt

[Naiming Shen <[e-mail]>]

Hi Lars,

On Mar 3, 2012, at 12:55 AM, Eggert, Lars wrote:

> Hi,
> 
>> 8.  IANA Considerations
>> 
>>   The IANA is requested to assign a well-known port number, Trace-Ping
>>   Port, for the UDP and TCP of this Trace-Ping extensions.
> 
> I'm curious why you think you need a port number for this ping extension. Ping is a diagnostic procedure that can be used with any port, and placing payload into the packet sent to elicit the ICMP response doesn't change that.

Yes, I understand Ping can use any port(or Identifier as in this draft). But it's rate-limited
also randomly by routers on the Internet. This well-known port/id can signal a new service
for the network, and can be subject to different filtering profile.

> 
> In other words, ping isn't a protocol.
> 
> Also, with regards to TCP ping, do you envision your payload data to be placed inside the SYN?

Yes for syn or ack. The tcp server should not care about the length being zero or not though.

thanks.
- Naiming

> 
> Lars