Unix Linux Administration I

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Presentation transcript:

Unix Linux Administration I Week 5

Network Configuration Basic networking Routing and Subnetting Netmsks vs CIDR Ethernet card numbering (ethX and ethX:Y) Current Server Configurations (public, private) Interfaces file (and redhat equiv.) Address, netmask, network, broadcast, gateway Centos - /etc/sysconfig/networking-scripts Debina - /etc/network/interfaces Subnetting Ip -> binary, netmask – binary, logical AND to get range Hosts file - /etc/hosts Override/statically set host -> ip entries Troubleshooting? Hostname configuration/meaning (fqdn, long, short) Nsswitch.conf - configurable sources for information getent

IPTables Network Ports Input, Forward, Output, default actions 1-65535 (udp, tcp) Input, Forward, Output, default actions -p flag (protocol) -s flag (source) -i flag (interface) -d flag (destination DROP, ACCEPT, QUEUE, RETURN NAT/IPMASQ Prerouting, Postrouting, Output Port forwarding

Startup scripts RunLevels /etc/init.d/* /etc/rc*.d/ 0 – shudown 1 – single user mode 2 – multi user mode (no GUI) – default Debian 3 – multiuser mode (no GUI) – default for Redhat 4 – multiuser mode (no GUI) - typically unused 5 – multiuser mode (with GUI) – default for debian/redhat with GUI installed 6 - Reboot /etc/init.d/* Start and stop scripts /etc/rc*.d/ Runlevels Update-rc.d vs chkconfig /etc/default # Default parameters for programs /etc/alternatives # Default commands (more debian than redhat) /etc/rc.d/* # Stores the RunLevel folders