25 tháng 8, 2016

TCP/IP NETWORKING MANAGEMENT

  • /etc/hosts, /etc/sysconfig/network, /etc/sysconfig/network-scripts/ifcfg-ethX
  • ifconfig, ifconfig ethX up, ifconfig ethX down, ifup ethX, ifdown ethX
  • IP aliasing
  • ping –c –a x.x.x.x
  • IP classes :
  • A – 10.0.0.0 to 10.255.255.255
  • B – 172.16.0.0 to 172.31.255.255
  • C – 192.168.0.0 to 192.168.255.255
  • Subnetting and subnet masks
  • CIDR: Classless Inter-Domain Routing
  • TCP/IP layers –
  • Applications – FTP, HTTP, SSH. EU-Apps
  • Transport [TCP,UDP] – Delivery of data to apps. Uses segments.
  • Network [IP,ICMP] – Basic comm, H/W, routing. Uses packets.
  • Link [ARP, DevDrvrs] – NW H/W, devdrvs. Uses frames.
  • Physical – Copper Wires, physical medium, cables, Ethernet, Optical fibres, FDDI, ATM, IPX/SPX, Token ring
  • MTU and fragmentation
  • 6-byte MAC addresses and "http://www.iana.org/assignments/ethernet-numbers for the first 3 bytes.
  • 4-byte quad-dot, IP addrs, virtual Loopback addr,Ports, /etc/services, sockets, Privileged and Well-known ports
  • Address types –
  • Unicast – addrs that refer to a single host [NIC actually]
  • Multicast – addrs that identify a group of hosts [224 to 239] Good for videoconferencing
  • Broadcast – addrs that include all the hosts on the local network
  • Routing – Routing Tables, ICMP redirects
  • Static routing
  • /etc/sysconfig/static-routes : eth0 net 192.168.0.20 netmask 255.255.255.0 gw 192.168.0.10
  • netstat -r, netstat –rn
  • The destination is a NW address
  • The gateway must be a host address of a m/c which specifies that pkts must be sent to it to reach the destination address.
  • Gateway is the default route
  • Configuring static routes
  • route add –net 192.168.0.10 netmask 255.255.255.0 gw 192.168.0.10 eth1
  • route add default gw 192.168.0.10 eth0
  • /etc/sysconfig/network : GATEWAY=x.x.x.x and the default route
  • Local DNS and name resolution : and /etc/host.conf, /etc/nsswitch.conf
  • Dynamic routing – routed, gated
  • ICMP redirects
  • ARP – The Addr resolution protocol
  • mii-tool – Configuring autonegotiation and other media-specific options

  • Network Interfaces Config tools :
  • netconfig
  • netconf
  • netcfg
  • redhat-config-network
  • neat
  • neat-tui
  • neat-control
  • redhat-config-network-cmd
  • redhat-config-network-druid

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