[Bug 227086] Upgraded world - broken OpenVPN second tun - ifconfig: ioctl (SIOCAIFADDR): File exists

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227086

--- Comment #3 from Eugene Grosbein <eugen at freebsd.org> ---
(In reply to Marek from comment #2)

The problem is the address 10.20.20.1 that is bounded first to "local system"
by means of assigning it to local side of tun0. Then, an attempt is made to
assign it to "remote" part of tun1 that is accomplished with creation of
another route to 10.20.20.1/32 overriding existing one. Such configuration
worked in older versions of FreeBSD breaking traffic flow to such an address
via loopback interface but recent versions does not allow overrides to loopback
routes anymore.

However, your task can be solved with much simplier configuration. In fact, you
need not local "client" OpenVPN/tun1 at all. Just assign 10.20.20.10/32 to
loopback interface as alias in /etc/rc.conf:

ifconfig_lo0_alias0="inet 10.20.20.10/32"

And your services like mail, www, etc. will work as usual.

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