Rename service name of port 502 from 'asa-appl-proto' to 'modbus'

[Paulino Calderon <paulino () calderonpale com>]

Hi list,

Recently I had the opportunity to test our SCADA/ICS scripts in a lab with Stephen J. Hilt and I noticed the service 
name of port 502 is outdated. Currently nmap-services marks port 502 as asa-appl-proto which could be confusing if we 
are expecting modbus. It seems that a few years ago the port was allocated as 'asa-appl-proto’ [1] but IANA marks it as 
‘Modbus Application Protocol’ [2]  now which seems more appropriate. 

What do you think about renaming this service? I couldn’t find much information about asa-appl-proto but it seems it is 
used by Cisco IOS XE 3.16S and IOS 15.5(3)M only. [3]

Cheers.

[1] 
https://web.archive.org/web/20111004183019/http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xml
 
<https://web.archive.org/web/20111004183019/http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xml>
[2] http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xml 
<http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xml>
[3] 
http://www.cisco.com/c/en/us/td/docs/wireless/controller/nbar2_prot_pack/11-0-0/b-nbar2-prot-pack-1100/nbar-prot-a1100.html
 
<http://www.cisco.com/c/en/us/td/docs/wireless/controller/nbar2_prot_pack/11-0-0/b-nbar2-prot-pack-1100/nbar-prot-a1100.html>
 

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