[syslog-ng] Questions Again :)

[mrgenius]

hi All!
 I am running syslog-ng logging in msyql database with phpsyslog-ng as front 
end. 
 1) Now i have 1 problem. The Devices which are sending logs don't have any 
hostnames associated with them nor i am running any DNS server. As a result 
the listing of hosts i am getting are in the form of IP addresses of hosts. 
 Is it possible to show hostname against IP adresses?? Like x.x.x.x will be 
shown as ABC-ROUTER ??
 if i define ABC-Router as x.x.x..x in /etc/hosts .. what configuration do i 
need to make in syslog-ng.conf??
 2) I want to Allow only specific hosts to send logs to loghost. But when i 
tried to put IP of hosts in configuration it gave me errors.
Starting system logger: io.c: bind_inet_socket() bind failed 61.x.x.x:514 
Cannot assign requested address
I used following configuration
 source net { 
udp(ip(61.x.x.x) port(514) );
udp(ip(62.x.x.x) port(514) );
udp(ip(63.x.x.x) port(514) );
};
 Do i have to allow this policy on firewall or syslog-ng also supports it?? 
bcause with only udp(); Every device on internet can start sending me logs 
and my server will be under attack.
 Regards,
 -Geni
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