active/passive broadband connections to maintain various IT services

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c.itech

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Outlook version
Email Account
Exchange Server
plan to buy a firewall support active and passive internet connections, when active internet connection down, will failover to passive internet connection automatically, when active internet connection back on, will rollback to active internet connection automatically. Found a sonicwall should able to do this already.

public ip, default gateway and dns are different for active and passive internet connections, so when failover or rollback, they will change as well

IT services to maintain when active internet connection down are

- office internet access

- email service provided by exchange 2007

- internal/external web-based erp service provided by apache tomcat

office internet access

- achieve by add passive internet connection DNS to Windows DNS forwarder

email service provided by exchange 2007

- smtp achieve by additional MX record with passive internet connection's public IP and larger Preference Number (lower priority)

- http://en.wikipedia.org/wiki/MX_record#MX_preference.2C_distance.2C_and_priority

internal/external web-based erp service provided by apache tomcat

- By additional A record with passive internet connection's public IP for apache tomcat

- http://en.wikipedia.org/wiki/Round_robin_DNS

Any comments?

Any idea what need to do to maintain Outlook Anywhere and Outlook Web Access? Just additional A record as well?

Thx a lot!
 
originally passive should off when active is on, but requirement changed both can on all the time...
 
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