Date: Thu, 30 Jul 2009 13:09:40 -0700 From: "Li, Qing" <qing.li@bluecoat.com> To: "Stefan Bethke" <stb@lassitu.de>, "Qing Li" <qingli@freebsd.org>, "Bjoern A. Zeeb" <bz@freebsd.org> Cc: Matthias Andree <matthias.andree@gmx.de>, FreeBSD Current <freebsd-current@freebsd.org> Subject: RE: recent change to ifconfig breaks OpenVPN? Message-ID: <B583FBF374231F4A89607B4D08578A4304E22D95@bcs-mail03.internal.cacheflow.com> In-Reply-To: <ABCF4747-24D4-4435-952B-EA85A2AE999F@lassitu.de> References: <B4AA014B-2444-40AA-A3A3-417E4B89DF90@lassitu.de><4A709126.5050102@elischer.org><3A1518B9-2C8C-4F05-9195-82C6017E4902@lassitu.de><op.uxusbswp1e62zd@merlin.emma.line.org><BEE762CA-4282-4BA8-B92B-AFC7AAE3CA9A@lassitu.de> <ABCF4747-24D4-4435-952B-EA85A2AE999F@lassitu.de>
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>=20 > I did at least have time to figure out the commit that changed it: > 195914 >=20 > > Author: qingli > > Date: Mon Jul 27 17:08:06 2009 > > New Revision: 195914 > > URL: http://svn.freebsd.org/changeset/base/195914 > > > > Log: > > This patch does the following: > > > > - Allow loopback route to be installed for address assigned to > > interface of IFF_POINTOPOINT type. > > - Install loopback route for an IPv4 interface addreess when the > > "useloopback" sysctl variable is enabled. Similarly, install > > loopback route for an IPv6 interface address when the sysctl > > variable > > "nd6_useloopback" is enabled. Deleting loopback routes for > > interface > > addresses is unconditional in case these sysctl variables were > > disabled after an interface address has been assigned. >=20 In 7.x and prior releases, the local-ip of the PPP links=20 (e.g. tun, gif, gre) is not reachable within that system. I don't=20 know if that really make sense.=20 The Host Requirements RFC-1122, Section 3.3.4 on Local Multihoming seems to suggest the local-ip of a PPP link is not irrelevant as was treated by=20 the implementation. In r195914, I added a loopback route for the local-ip of the local end of a PPP link to make the local-ip reachable within the system. Since a host route is installed for the remote end, the installation of the loopback route for the local-ip (that is the same IP as the remote end) fails. As Julian pointed out, the configuration from OpenVPN seems erroneous. At this point I don't believe there is anything I need to fix but comments are welcomed. >=20 > Setting net.link.ether.inet.useloopback=3D0 does not restore the > previous behavior. >=20 I also verified setting (useloopback=3D0) * does * restore to the previous=20 behavior. -- Qing
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