[syslog-ng] syslog-ng to Azure Sentinel

[Steve Bernacki]

Hi David,


If you can provide a complete sample log message (redact any sensitive 
log information), I'm sure we can work the filter out.


Steve


On 5/23/2025 12:17 PM, David Jones wrote:
> I am dealing with the known Cisco bug for Excessive logging of 
> "vpn:vpn [INFO] device" messages in /var/log/messages file.  It is 
> filling our ingestion cap.  I have tried numerous ways to block this 
> from being ingested but nothing has worked(adding filter and log).  
> Below is my syslog-ng.conf and I am looking for any advice to stop the 
> "vpn:vpn [INFO] device" messages from being sent.  There are no syslog 
> ids for this either so blocking it from FMC also isn't working
>
>
>
> source s_sys {
>     system();
>     internal();
>     # udp(ip(0.0.0.0) port(514));
> };
>
> destination d_cons { file("/dev/console"); };
> destination d_mesg { file("/var/log/messages"); };
> destination d_auth { file("/var/log/secure"); };
> destination d_mail { file("/var/log/maillog" flush_lines(10)); };
> destination d_spol { file("/var/log/spooler"); };
> destination d_boot { file("/var/log/boot.log"); };
> destination d_cron { file("/var/log/cron"); };
> destination d_kern { file("/var/log/kern"); };
> destination d_mlal { usertty("*"); };
>
> filter f_kernel     { facility(kern); };
> filter f_default    { level(info..emerg) and
>                         not (facility(mail)
>                         or facility(authpriv)
>                         or facility(cron)); };
> filter f_auth       { facility(authpriv); };
> filter f_mail       { facility(mail); };
> filter f_emergency  { level(emerg); };
> filter f_news       { facility(uucp) or
>                         (facility(news)
>                         and level(crit..emerg)); };
> filter f_boot   { facility(local7); };
> filter f_cron   { facility(cron); };
>
>
> #log { source(s_sys); filter(f_kernel); destination(d_cons); };
> log { source(s_sys); filter(f_kernel); destination(d_kern); };
> log { source(s_sys); filter(f_default); destination(d_mesg); };
> log { source(s_sys); filter(f_auth); destination(d_auth); };
> log { source(s_sys); filter(f_mail); destination(d_mail); };
> log { source(s_sys); filter(f_emergency); destination(d_mlal); };
> log { source(s_sys); filter(f_news); destination(d_spol); };
> log { source(s_sys); filter(f_boot); destination(d_boot); };
> log { source(s_sys); filter(f_cron); destination(d_cron); };
>
> # Source additional configuration files (.conf extension only)
> @include "/etc/syslog-ng/conf.d/*.conf"
>
>
> # vim:ft=syslog-ng:ai:si:ts=4:sw=4:et:
> #
> #
> source s_src { udp( port(514)); tcp( port(514));};
>
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