Technical information

Nonvolatile Parameter Database
2-122 AT+i Commands Reference Manual May 31, 2008
+iDF - IP Protocol 'Don't Fragment' Bit Value
n= Bitmapped flags:
Bit 0: Disable W24's response to ICMP ECHO (PING) requests.
When this bit is set, W24 will not respond to any PING requests,
thereby eliminating the possibility of a PING attack on W24.
Bit 1: Disable W24's remote debug daemon. When this bit is set,
W24 will not enable its internal (UDP) debug port, which is
normally activated for administering remote support.
Bit 3: Disable unauthenticated viewing of the W24's internal
website. When this bit is set, the internal Web site may be
browsed only if the remote browser provides the RPG parameter
(password). In this case, when the RPG parameter contains a
password value, W24's Configuration Web site will first display a
password entry form. The remote end must submit the correct
RPG value in order to continue to the Configuration site's home
page. W24 uses the SHA1 hash algorithm throughout the
authentication process, so actual password values are never
transmitted. When this bit is set, but the RPG parameter is empty,
the Configuration Web site is effectively disabled, as all password
values will be rejected. However, if the RPG parameter contains
the special '*' wildcard value, authentication is bypassed and the
authentication form will be skipped altogether. In this case, the
Configuration website's home page will be displayed
immediately.
Default: 0 (All services enabled).
Result Code:
I/OK If n is within limits.
I/ERROR Otherwise.
AT+iSDM? Returns current Service Disabling mode followed by I/OK.
AT+iSDM=? Returns the message "0-7" followed by I/OK.
Syntax: AT+iDF=n
Sets the value of the Don't Fragment bit used in all subsequent IP
packets.
Parameters: n=0 .. 1
Command Options:
n=0 IP packets transmitted may be fragmented by routers.
n=1 IP packets transmitted may not be fragmented by routers.
Default: 0
Result Code:
I/OK If n is within limits.
I/ERROR Otherwise.