Basic linux router i
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Basic Linux Router I. [email protected] 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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Basic linux router i

Basic Linux Router I

  • [email protected]


Router a device that

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


Routing how it works

Routing.. How it works.

  • Default Gateway

  • Routing Table

  • Routing mechanism

    • Static Routing

    • Dynamic Routing


Default gateway

Default Gateway

  • An address for host to deliver packet to, if source and destination host are not in the same subnet

  • Default Gateway Example...


Routing tables

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


Routing mechanism

Routing Mechanism

  • Static Routing

  • Dynamic Routing

    • Interior Routing Protocol

      • RIP, OSPF, IGRP

    • Exterior Routing Protocol

      • BGP, EIGRP


Routing devices

Routing Devices

  • Dedicated Devices

    • Enterprise

      • Cisco, 3COM, Juniper, Huawei, etc.

    • SOHO

      • Various broadband router.

  • PC based Devices

    • Linux Router


Linux router command

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]


Linux router command1

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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