Linux - SecurityThis forum is for all security related questions.
Questions, tips, system compromises, firewalls, etc. are all included here.
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I have set up my Linux box as a router and firewall. I would like to know what logs to look at to see if I am being attacked. Does anyone have any good monitoring tips, logs to check, things to be aware of, etc.
it's always fun checking the /var/log/httpd/error_log if yuo've got apache running, all those IIS Code Red / Blue attacks pile up faster than you can count them!
if you've a mail server, look at all the failed spam in /var/log/maillog
just make sure that whatever services you have are as local as possible, samba on internal ip's only etc... i was got a number of times when people got into my smb shares cos i didin't know what i was doing
Logging firewall messages depends on how you set up syslogd (/etc/syslog.conf) it uses the KERN facility, but you can direct the messages by level to a different log.
Not because I'm lazy, but I'd like you to read the threads in this forum concerning firewalling, breakins and setups. By now I think we've got some good leads in almost every thread on how to extend your detection and logging capabilities.
If after reading you've don't see the pattern, or got more specific questions, just ask, ok :-]
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