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4 Administrator’s Guide SurfControl RiskFilter - E-mail V5.2.4
F
INDING
YOUR
WAY
AROUND
Load balancing with RiskFilter
1
LOAD BALANCING WITH RISKFILTER
You can deploy RiskFilter in a cluster and load-balance using MX records:
1 On the DNS server hosting your domain, create an MX record for each primary RiskFilter server using
the same MX preference.
2 Give the failover server a higher number. This will give it a lower preference.
Table 1-1 shows an example of MX preference assignments for load-balancing and failover using MX
records.
Figure 1-2 Load balancing
Table 1-1 Using MX Records for Load-Balancing
Mail Exchanger IP Address MX Preference
Site A
mx1.siteA.com 208.126.216.20
5
mx2.siteA.com 208.126.216.21
5
mx3.siteA.com 208.126.216.22 5
mx4.siteA.com 197.201.56.201 10
Site B
mx1.siteB.com 197.201.56.201
5
mx2.siteB.com 197.201.56.202
5
mx3.siteB.com 197.201.56.203
5
mx4.siteB.com 208.126.216.20
10