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Using firewall in routed or transparent mode

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http://serverfault.com – For the last years we've been using a Sonicwall PRO 2040 firewall in a relatively small hosting environment. But we want to upgrade to a faster box which also support IPv6 and preferably we'd like to stay with Sonicwall (as it has served us well over the years) and upgrade to a NSA 2400. All this time we have run this firewall in so called 'transparent mode'. This way the firewall is completely transparent to the network (i.e. servers) behind the firewall but still the firewall protects the network. Servers that are behind the firewall are configured as if the firewall is not there, e.g. the (HowTos)