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High Availability with MikroTik RouterOS

This document discusses using anycast routing with MikroTik RouterOS to provide high availability network services with limited budgets. Anycast routing distributes service requests across multiple redundant servers located in different areas. It allows services to remain available even if one server fails, as clients will be routed to the nearest available server. The document outlines how to set up anycast routing with RouterOS, examines its benefits like easy configuration, scalability and security. It also notes some limitations and provides a case study example using DNS anycast routing.

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Ahmad AL
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346 views19 pages

High Availability with MikroTik RouterOS

This document discusses using anycast routing with MikroTik RouterOS to provide high availability network services with limited budgets. Anycast routing distributes service requests across multiple redundant servers located in different areas. It allows services to remain available even if one server fails, as clients will be routed to the nearest available server. The document outlines how to set up anycast routing with RouterOS, examines its benefits like easy configuration, scalability and security. It also notes some limitations and provides a case study example using DNS anycast routing.

Uploaded by

Ahmad AL
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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High availability network services

using MikroTik RouterOS


by Martin Pna

MUM Poland, Warsaw, 16th March, 2012

High Availability

things have to work

budget is limited

need to keep setups simple

How to achieve it?

primary/secondary server
(DNS, NTP, RADIUS)
cluster
use underlying protocols to do the work
DHCP broadcast
VRRP special protocol
anycast (?)

Dark side

usage of secondary option usually means some


timeout
what is not offered by default
(primary/secondary) has to be done by
somebody, it is expensive (extra hardware,
extra software, administrators' time)
there is no cluster solution for everything

Anycast is the (interesting) way

easy to setup

scalable

secure

Easy to setup

puts main burden on underlying network layer

does not differentiate between L7 protocols

is not as complicated as cluster

in effect, you will use the same configuration for


clients network-wide

Scalable

routing usually done to provide service from the


nearest server, small latency, low load

you can have your services distributed geographically

you can use more platforms for the same purpose

if one server fails, not a problem, there is another one


ready
if there is really problem, it only affects near clients

Secure

if server gets compromised, just turn it of, there


is enough of its clones
if DDoS is made to your service, it has only
local impact
you can create fake server as honeypot for
attacks

Is it so perfect? Of course not.

there is not much intelligence, having working


L3, does not mean there is L7 service running
it is usable maily for the simple tasks like
DNS/NTP/RADIUS, the client does not care
where the information is from, but administrator
has to take care
even if you want dedicated virtual servers using
MikroTik's KVM, RouterOS is 32bit system,
2GB of RAM maximum

Is it new approach? Not at all

anycast is not something that much special


itself, only special usage of unicast

IPv6

already used worldwide (?)

Root nameservers example

Why RouterOS?

it is a router, who else should take care of


where to send the requests
it already has the mostly crucial server
functionality like DNS or NTP
if the inbuild servers are not enough, there is
always MetaROUTER or KVM available for
endless possibilities

Example study case

it is only about routing, no special package, no


special configuration menu
dynamic routing is done by OSPF
it is the most easiest way, no special hardware,
no virtualization
DNS is the network service

Topology

3 possible scenarios

network service in router itself, only special loopback


bridge interface created for the anycast address
virtual RouterOS created in MetaROUTER or KVM to
do the network service server and nothing else, or
possibly special Linux/Windows one-purpose server
installed in KVM (Linux in MetaRouter)
network service servers are not hosted by MikroTik
RouterOS, but routers redistribute routing information
about them

Recommendations

segregate network and services

either via virtualization

or via physical segregation

do have management IP address for network


service server to be able to easily turn-on/off
the anycast address

use this technique sensibly

be careful about ECMP

Troubleshooting

good understanding of routing solves


everything
traceroute is your friend

Resources

http://en.wikipedia.org/wiki/Anycast

http://www.root-servers.org/

www.sanog.org/resources/sanog5-woody-anycast-v10.pdf

Thanks for your attention (patience)

Questions... ?

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