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Redundant Routers. Jordan Curzon Charles Smutz. Purpose. Redundancy/Reliability Remove Single points of failure Manual Load Balancing Use both internet Links Other Services DNS DHCP Network Management. Redundancy through HA. Availability Monitoring Resource Management IP Takeover

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Redundant routers

Redundant Routers

Jordan Curzon

Charles Smutz


Purpose
Purpose

  • Redundancy/Reliability

    • Remove Single points of failure

  • Manual Load Balancing

    • Use both internet Links

  • Other Services

    • DNS

    • DHCP

    • Network Management


Redundancy through ha
Redundancy through HA

  • Availability Monitoring

  • Resource Management

    • IP Takeover

      • Gratuitous ARP

        • http://www.ultramonkey.org/3/ip_address_takeover.html

  • Permanent/Service Addresses




Switch redundancy
Switch Redundancy

  • Distribution switches as single point of failure





Other redundancy issues
Other Redundancy Issues

  • Power

  • Cable Runs


Routing with iptables
Routing with Iptables

  • Standard linux software router

    • Firewall with Iptables rules

    • NAT (MASQ)

    • Port Forwarding (DNAT)

  • Same Rule Set on each router

  • Separate chain for packets destined for each public address (P1, P2)

    • Same port can be use on each address

    • Shorter chains for better performance


Redundant routers
DNS

  • Master/Slave

    • Slave loads zones from Master via zone transfer

  • Resolve requests instead of forwarding to BYU servers


Redundant routers
DHCP

  • Failover

    • Primary and Secondary Server split pool

    • Same config file—both have static leases

      • Included sym link to primary/secondary config

    • Proprietary communication over arbitrary ports (519,520)

    • Compile from Source!


Manual load balancing
Manual Load Balancing

  • Static leases point to R1, dynamic to R2 for primary default gateway



Network management
Network Management

  • Ping permanent Address

  • Optionally send Email with HA

  • Optionally use SNMP


Live demo
Live Demo

  • Off to 385