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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
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
slide12
DNS
  • Master/Slave
    • Slave loads zones from Master via zone transfer
  • Resolve requests instead of forwarding to BYU servers
slide13
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
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