H20

Water is the primary source of life. Without it we as humans would be dead. I have grown an interest in seeking the perfect pH of drinking water and found as a person whom consumes energy drinks that water with a pH of 9.5 *Deep Purple* is by far the best. While water is our […]

Kernel params used for synfloods

echo 1 > /proc/sys/net/ipv4/tcp_syncookies echo 45 > /proc/sys/net/netfilter/nf_conntrack_tcp_timeout_syn_recv echo 3 > /proc/sys/net/ipv4/tcp_synack_retries echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle I tried to use these common values to help deter a syn flood from occurring. Syn-cookies challenges the other opponent. While you change the default timing of syn_recv from 60 seconds to 45 seconds which […]

Getting tired of a Synflood?

This dirty last ditch modification to the kernel will force close connections after so many seconds. The default is 60. echo 30 > /proc/sys/net/ipv4/tcp_fin_timeout This will tell everyone that you have 30 seconds to finish or else I will drop your connection. This is good in a pinch, but do not recommend running this at […]

Instant kernel panic

After researching what could cause an instant kernel panic with no documentation or messages in kdump, I found that if manually execute the following code (warning: will cause system disruption, I am not held responsible for your copy and pasting): echo c > /proc/sysrq-trigger More information regarding this can be found on the Old Internet […]

Getting on Google *GoG – SEO*

Ahh, do I remember the days when getting on Google required you to use a third party strange looking URL. Sometimes it was hard to actually making it on Google. SEO submission was very hard. The days of META keywords and tags. Well, no more! Google allows you to submit your “Domain Property” or websites […]

while loop (true)

Need to execute a set of commands in a loop, non-stop? while true; do killall -9 program; sleep 3; done This will tell your Linux O/S do killall -9, sleep for 3 seconds, and start it again. This is great if you don’t have access to a crontab or just need it for a quick […]

named-checkzone

Do you need to check the zone file syntax via command line after making a change. You can run the following: named-checkzone domain.com /var/named/domain.com.db Results should be similar to zone domain.com/IN: loaded serial 20190xxxxx OK