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Basic Linux Router I

Basic Linux Router I. touch@coe.psu.ac.th. Router, a device that. Working on OSI Layer 3 (Network Layer) Connected to more than one networks Finding a best path to deliver packets Forward packets from one network to another Can run on either dedicated device or personal computer.

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Basic Linux Router I

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  1. Basic Linux Router I • touch@coe.psu.ac.th

  2. Router, a device that ... • Working on OSI Layer 3 (Network Layer) • Connected to more than one networks • Finding a best path to deliver packets • Forward packets from one network to another • Can run on either dedicated device or personal computer

  3. Routing.. How it works. • Default Gateway • Routing Table • Routing mechanism • Static Routing • Dynamic Routing

  4. Default Gateway • An address for host to deliver packet to, if source and destination host are not in the same subnet • Default Gateway Example...

  5. Routing Tables • Kernel IP routing table • Destination Gateway Genmask Flags Metric Ref Use Iface • 202.12.74.192 0.0.0.0 255.255.255.192 U 0 0 0 eth1 • 192.100.77.0 172.30.0.1 255.255.255.0 UG 0 0 0 eth0 • 172.30.0.0 0.0.0.0 255.255.252.0 U 0 0 0 eth0 • 192.168.0.0 172.30.0.1 255.255.0.0 UG 0 0 0 eth0 • 172.16.0.0 172.30.0.1 255.240.0.0 UG 0 0 0 eth0 • 0.0.0.0 202.12.74.193 0.0.0.0 UG 0 0 0 eth1

  6. Routing Mechanism • Static Routing • Dynamic Routing • Interior Routing Protocol • RIP, OSPF, IGRP • Exterior Routing Protocol • BGP, EIGRP

  7. Routing Devices • Dedicated Devices • Enterprise • Cisco, 3COM, Juniper, Huawei, etc. • SOHO • Various broadband router. • PC based Devices • Linux Router

  8. Linux Router command • ifconfig [-v][-a][-s][interface] • route [-CFvnee] • route [-v][-A family] add [-net|-host]target[netmask Nm][gw Gw][metric N][mss M][window W][irtt I][reject][mod][dyn][reinstate][[dev]If] • route [-v][-A family] del [-net|-host] target [gw Gw][netmask Nm][metric N][[dev]If] • route [-V][--version][-h][--help]

  9. Linux Router command • ping [ -LRUbdfnqrvVaAB][ -c count] [ -i interval] [ -l preload][-p pattern] [ -s packetsize] [ -t ttl] [ -w deadline][ -F flowlabel] [ -I interface] [ -M hint] [ -Q tos][ -S sndbuf] [ -T timestamp option] [ -W timeout][ hop ...] destination • traceroute [ -dFIlnrvx ] [ -f first_ttl] [ -g gateway] [ -i iface] [ -m max_ttl] [ -p port] [ -q nqueries] [ -s src_addr] [ -t tos] [ -w waittime] [ -z pausemsecs ] host [ packetlen ]

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