ppp(8) PPPoE fails when ifname contains "."

[Herbert J. Skuhra]

On Wed, 06 Jan 2016 23:29:09 +0100,
Ben Woods <woodsb02 at gmail.com> wrote:
> 
> Hey everyone,
> 
> I was recently trying to set up PPPoE to my ISP, over my network interface
> which is configured with 802.1q VLAN tagging using vlan(4).
> 
> I utilised the vlans_<interface>=<tag> feature described in rc.conf(5),
> which creates a cloned interface named <interface>.<tag>.
> 
> In /etc/ppp.conf I used the syntax PPPoE:<interface>.<tag> and this exposed
> an interesting issue - ppp(8) would not set up the PPPoE interface
> correctly when the interface contains a period.
> 
> When I manually created the vlan clone interface with a name not containing
> a period, ppp(8) worked fine.
> 
> Has anyone seen this before? A quick review of the ppp(8) code, and I am
> struggling to see the exact point where this syntax problem is.

Like this:

https://lists.freebsd.org/pipermail/freebsd-stable/2009-July/051096.html

--
Herbert