08-25-2006
You might just not have a working DNS (can you get to the internet from that box?).
It's more likely that any requests on port 25 that aren't destined for your mail server are being dropped at the border firewall.
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LEARN ABOUT CENTOS
uuid_compare
UUID_COMPARE(3) Libuuid API UUID_COMPARE(3)
NAME
uuid_compare - compare whether two UUIDs are the same
SYNOPSIS
#include <uuid.h>
int uuid_compare(uuid_t uu1, uuid_t uu2)
DESCRIPTION
The uuid_compare function compares the two supplied uuid variables uu1 and uu2 to each other.
RETURN VALUE
Returns an integer less than, equal to, or greater than zero if uu1 is found, respectively, to be lexicographically less than, equal, or
greater than uu2.
AUTHOR
Theodore Y. Ts'o
AVAILABILITY
libuuid is part of the util-linux package since version 2.15.1 and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
SEE ALSO
uuid(3), uuid_clear(3), uuid_copy(3), uuid_generate(3), uuid_is_null(3), uuid_parse(3), uuid_unparse(3)
util-linux May 2009 UUID_COMPARE(3)