Posts in category www.systems.takizo.com
Reverse DNS, in simple explanation it means that resolve your IP address into hostname. Nowaday it became a must have requirement for mail server’s IP address. It is also one of the method to determine your mail server IP is glue to the hostname. Here is how to find out the reverse DNS IP address is pointed to which DNS (Read more...)
We have OURMON running on one of network segment for quite some time, it is very helpful and resourceful when DDoS attack happened, especially to help our customer to find out which destination is targeted on the attack and from which sources. Below is the graph that we previously captured while running OURMON version 2.70. OURMON Version [...]
first : cd /destination/directory second : split /source/directory/big-huge-file prefix-to-apply-onto-splited-files Voila !!! (use the parameter -b to specify the size of splited files in BYTES, NOT kb, mb or gb)
after changing time zone (tzsetup), restart cron (/etc/rc.d/cron restart) to let it know the changes or else the cron jobs will use the previous time zone.
date -d ‘<Unix epoch> <epoch date> sec’ e.g. date -d ’1970-01-01 988822888 sec’ would dated “Wed May 2 17:31:28 MYT 2001″ 20080430 : get a particular date in epoch, e.g. date -d ‘Apr 30 2008 00:00:00′ ‘+%s’
On a FreeBSD server 1. reboot server 2. choose to boot into single user mode 3. mount -o rw <root partition> e.g. mount -o rw / 4. passwd <root account> e.g. passwd root 5. mount -o ro <root partition> e.g. mount -o ro / 6. reboot server again Voila !!!
dig <record type> <host.name> e.g dig SRV _someservice._port.hostname.domainame.com.my OR dig SRV _https._ICMP.host.takizo.com
e.g. rm -rf backup-20070[8-9]-* would delete : backup-200708-morning backup-200708-evening backup-200709-night backup-200709-latenight but not : backup-200706-morning backup-200707-afternoon backup-200711-midnight e.g. ls backup-20070[1-9] would list all backup starting from January to September but leave October, November & [...]
sed -e 1d -e 50d -e ‘/junks/d’ would remove first and 50th line & any line(s) with the word “junks”. update 20080821 : sed -e ‘/^$/d’ would remove every empty line
specify the parameter “ServerAliveInterval 60″ in /etc/ssh_config or /etc/ssh/ssh_config. for more info, man ssh_config
acl_check_rcpt: blah … blah … blah … deny message = rejected as $sender_host_address is blacklisted in $dnslist_domainn$dnslist_text domains = domain-one.com : domain-two.com : domain-three.com dnslists = sbl-xbl.spamhaus.org blah … blah … blah … reference link : http://www.exim-new-us [...]