FAQ for the 'Networking' Category

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BSD PF Firewall: Displays Active Packetfilter States And Rules

Q. How do I view active connections with PF firewall under FreeBSD / OpenBSD UNIX operating system?
Explain: Five Nines ( 99.999% ) Computer / Network Uptime Concept

Q. Some service provider guarantees 99.999% uptime for their service. Can you explain meaning of five nines?
How To: Make Sure /etc/resolv.conf Never Get Updated By DHCP Client

Q. I’m using GNU/Linux with the Internet Systems Consortium DHCP Client. dhclient, provides a means for configuring one or more network interfaces using the Dynamic Host Configuration Protocol. It also updates my /etc/resolv.conf each time my laptop connects to different network. I would like to keep my existing nameservers. How do I skip /etc/resolv.conf update?
Debian / Ubuntu Linux Install NTPD To Synchronism Clock With Internet Standard Time Servers

Q. How do I install and configure NTP ( Network Time Protocol ) daemon to keep my dedicated servers clock in sync?
MySQL: Change Default Port Under Linux / UNIX

Q.I’m using MySQL 5 under Red Hat Enterprise Linux 5. How do I change default mysql server port (tcp port 3306) under Linux or UNIX operating systems?
BIND: Stop Recursion DNS Under Linux / UNIX

Q. How do I stop recursion (recursive query) under BIND 9 DNS server?
Red Hat Enterprise Linux / CentOS Linux Enable EPEL (Extra Packages for Enterprise Linux) Repository

Q. How do I enable EPEL (Extra Packages for Enterprise Linux) repo and install the packages under RHEL / CentOS Linux?
How To Reuse SSH Connection To Speed Up Remote Login Process

Q. How do I reuse same ssh connection to speed up remote login procedure with OpenSSH client?
Red Hat Linux Static Routing Configuration

Q. I’ve two network interface connected to two different routers as follows:
[a] eth0 LAN network 10.0.0.0/8 - gateway IP - 10.8.2.65

[b] eth1 ISP assigned network 202.54.22.128/28 - gateway IP - 202.54.22.129
I can only ping to public server but not to another servers inside LAN? I’m not able to route traffic via 10.8.2.65. How do I configure static routing under Red Hat Enterprise Linux 5.x or CentOS Linux 5.2?
FreeBSD Find Out Network Card / Port Speed

Q. Under Linux I can use Ethtool and mii-tool, but they are not available under FreeBSD. How do I tell the port speed of the nic under FreeBSD operating system?