To make sure we are not leaving anybody out, here is a text version of th=
e
Table that Roger deBry et al. produced and earlier sent to the DL as an P=
DF
attachment. Thanks to Roger for this additional version.
Carl-Uno
--IPP - Implications of New Port Number and Scheme
Assertion: When we began the IPP work we had general agreement that one major objective of our work would be to define a protocol that could be quickly deployed in customer=92s enterprises, using existing infrastructure. Tha= t is, we did not want to have IPP deployment depend upon the development and widespread deployment by our customers, of a new generation of Web servers, proxies, or firewalls.
The following table attempts to summarize discussion on this topic on the IPP distribution list.
Key: HTTP:80(Post) means HTTP on port 80, using Post HTTP:X(Post) means a new port for IPP, using Post IPP:X-HTTP means a new port for IPP, using IPP as the scheme name, but still using HTTP on the wire IPP:X-IPP means a new port number and scheme, and using the IPP scheme on the wire. HTTP:80(Print) means defining a new HTTP Print method on port 80
Clients: HTTP:80(Post) - no impact HTTP:X(Post) - no impact IPP:X-HTTP - Minimal impact IPP:X-IPP - Minimal impact HTTP:80(Print) - Minimal impact
Servers: HTTP:80(Post)- no impact HTTP:X(Post) - no impact, most servers can listen to multiple ports. HTTP:X-HTTP - no impact HTTP:X-IPP - minimal imapct HTTP:80(Post) - Minimal impact - may be some Web servers make this more difficult than others
Proxies: HTTP:80(Post) - no impact HTTP:X(Post) - no impact IPP:X-HTTP - no impact IPP:X-IPP - breaks existing proxies HTTP:80(Print) - breaks some installed proxies=0D=0C
Firewalls: HTTP:80(Post) - Can reconfigure to block inbound traffic, based on IP address. May be now way to block outbound traffic. HTTP:X(Post) - Can reconfigure to block inbound traffic based on IP address, or inbound and outbound based on port number IPP:X-HTTP - Can reconfigure to block inbound traffic, based on IP address. May be now way to block outbound traffic IPP:X-IPP - breaks many installed firewalls. At best, firewalls have to be reconfigured. HTTP:80(Print)- Most firewalls do not do method inspection. Breaks some existing firewalls.=0D=0C Carl-Uno Manros Principal Engineer - Advanced Printing Standards - Xerox Corporation 701 S. Aviation Blvd., El Segundo, CA, M/S: ESAE-231 Phone +1-310-333 8273, Fax +1-310-333 5514 Email: manros@cp10.es.xerox.com