Bridged OpenVPN: Are these iface settings safe on a dynamic DHCP?

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http://serverfault.com – I'm following this guide in order to set up OpenVPN. The tutorial looks fine, but I got a bit sceptical when it told me to change my network interface settings. More precisely it tells me to switch out the current iface eth0 settings, from auto to what's listed below. I havent't worked long enough with linux based system to know if the settings below will break my connection, or for that matter, what exactly the settings are defining. As the server is a VPS I have to run it on a dynamic setting. To make matters worse I don't have access to it and loosing connection will mean I'll have to ha (HowTos)