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How to setup firewall fail-over?

We have one Juniper SSG5 firewall. To have fail-over, we are going to buy one more firewall.
Clients should not need to restart their computers if one of firewalls is down.
Any idea how to setup?

DHCP server need to release two default gateways?

Thank you.
2 Solutions
if the other one you re buying is the same as  the first  Juniper SSG5  , you can configure them to work in cluster mode , when one will fail ,the other one will take the job until the failed one will be repaired .

refer to http://www.nscreensales.com/v/vspfiles/downloadables/High_Availability_Modes.pdf
One note as well though, the SS5s and 20s do NOT have the clustering ability in the default license.

To cluster SSG5s or SSG20s we must buy the extended license to enable NSRP for the clustering.

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