Ron Varburg wrote:
I saw in the wikipedia, don't remember the exact entry, that
in contrast to most transport- and application-layer protocols, FTP or NTPv3
are examples for application protocols that embed network-layer addresses
Can someone elaborate on that ?
FTP in active mode, requires whoever does the get to give his
address/port (PORT command), using six 8 bit numbers; similarly in
passive mode, the server gives another address for the client to use --
possibly on another server. These were ipv4 addresses; I'm sure there's
an ipv6 extension as well.
An NTP server gives the ipv4 network addresses of the servers it syncs
from (if it's using it's own source).
In contrast, HTTP only uses names -- e.g., redirect will be to
"Location: http://blahblah"; with no network-layer addresses. Similarly,
SMTP only uses host names, not network layer addresses.
Ori
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