I use the following global options in my syslog-ng.conf file and don't have any information added to messages when they're forwarded from one syslog-ng server to another:
 
options { time_reopen (10);
          log_fifo_size (10000);
          long_hostnames (off);
          use_dns (no);
          use_fqdn (no);
          create_dirs (no);
          dir_perm (0755);
          perm(0644);
          chain_hostnames(no);
          keep_hostname (yes);

          flush_lines (0);
        };

Also, does the relay server use a template to reformat the message? If so, I would remove that as well.
 
HTH,
 
Steve
 

----- Message d'origine -----
De: gatfi sami <pfegatfi.sami@gmail.com>
Date: Vendredi, 17 Avril 2009, 11:18
Objet: [syslog-ng] message source hostname not displayed relay's hostname displaied instedd
À: Syslog-ng users' and developers' mailing list <syslog-ng@lists.balabit.hu>


> hi
> i have syslog-ng 2.O.9-27 on sles11 32bite (SUSE Entreprise server 11) on 3 virtual machine

> i use the following syslog organisation

> a syslog client (read error log and sends them to a relay)

> the relay frorwords the message to a syslog-server

> The syslog server writes the messages in a pipe binde to a mysql database

> untill now everithing is working perfectly

> but

> in the  syslog server i olways founf the relai host name ip adress

> i tried HOST_FROM in the template writing to the pipe it is always the same the relay's hostname

> destination d_mysql {
> pipe("/opt/topnet/mnt/mysql.pipe"
> template("INSERT INTO logs (host, facility, priority, level, tag, date,
> time, program, msg) VALUES ( '$HOST_FROM', '$FACILITY', '$PRIORITY', '$LEVEL','$TAG',
> '$YEAR-$MONTH-$DAY', '$HOUR:$MIN:$SEC', '$PROGRAM', '$MSG' );\n") template-escape(yes));
> };


> imagine if i have aot of cilents with each one a diiferent error log i will see nothing but the relai's hostname
> need hepl here

> thks

> ______________________________________________________________________________
> Member info: https://lists.balabit.hu/mailman/listinfo/syslog-ng
> Documentation:
> http://www.balabit.com/support/documentation/?product=syslog-ng
> FAQ: http://www.campin.net/syslog-ng/faq.html
>