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If you use "redirect-gateway def1" option in openvpn config file,the server will add a default gateway on your route table, what i want to konw is Why openvpn did not use network netmask as default gateway instead of netmask ?

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migrated from stackoverflow.com Sep 19 '11 at 5:12

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up vote 5 down vote accepted

OpenVPN isn't using as the route on the default gateway because you told it not to, with the redirect-gateway def1 config option. The manpage explains more, but basically by putting in two /1 routes covering the entire IPv4 address space, you get the same end result, but as it's more specific than a standard default route, it gets used in preference, so you don't have to either delete the existing default route, nor do you have to play games with routing metrics to get your OpenVPN route preferred.

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