No flaws found in OpenVPN software. Our response to the CVE-2019-14899 vulnerability report.

How does iOS interpret pushed DNS servers and search domains?

FAQ

On a split-tunnel, where redirect-gateway is not pushed by the server, and at least one pushed DNS server is present:

For example, the following directive on the server will tell the client to route all DNS requests to 172.16.0.23:

push "dhcp-option DNS 172.16.0.23"

while these directives on the server will only route foo.tld and bar.tld DNS requests to 172.16.0.23:

push "dhcp-option DNS 172.16.0.23"
push "dhcp-option DOMAIN foo.tld"
push "dhcp-option DOMAIN bar.tld"

Note that with redirect-gateway, the above discussion is moot, since all DNS requests are always routed through the VPN regardless of the presence or absence of added search domains.

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