am new Linux system user. How do I reload all sysctl variables without rebooting my server?
run a web-server and I would like to log packets with un-routable source addresses on Linux operating system. How can I log spoofed packets on Debian / Ubuntu / CentOS / RHEL / Linux based server? How can I log a Martian packet (packet from Mars) on Linux operating systems?
am trying to set exec-shield protection on Linux as described here
but getting the following error on Ubuntu Linux server version 12.04 LTS:
sysctl -w kernel.exec-shield=1
error: “kernel.exec-shield” is an unknown key
How do I fix this problem and make sure exec-shield buffer overflow protection security feature turned on Ubuntu Linux?
am under DoS attack. My cloud based server hosting company asked me to enable TCP SYN cookie protection to save my domain from SYN Attack. How do I turn on TCP Syn cookie protection under Ubuntu or CentOS Linux based server?
run a BT client and few other server program on Linux. Sometime these programs get overloaded with too many connections and crashes. If I restart my apps, I see lots of old IPs in a TIME_WAIT state. How do I force and and close everything in a TIME_WAIT state under Linux operating systems?
ow do I allow any ordinary users (such as my son or wife) to mount CD-ROMs, DVDs, USB drives, and other removable media on our home server powered by FreeBSD operating systems?
I‘m trying to use Cinelerra video editing and compositing software under Linux operating systems. However, I’m getting the following error:
MWindow::init_shm: /proc/sys/kernel/shmmax is 0x1000000.
It should be at least 0x7ffffff for cinelerra.
How do I fix this problem?