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Date: Tue, 02 Feb 2010 18:34:02 -0700
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From: Brett Glass <brett@lariat.net>
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Subject: Routing problems on VPN servers running FreeBSD 8.0-RELEASE 
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Everyone:

I've been trying to deploy some new VPN servers (with tunneling 
both in and out) running either mpd 5.3 or PoPToP on FreeBSD 8.0. 
Alas, I have been having a terrible time doing it. I'm getting 
error messages relating to routing, and connections which are 
supposed to have proxy ARP aren't getting it.

On mpd 5.3, I'm seeing error messages such as

Feb  2 16:45:22 <kern.info> 9milegate kernel: 
ifa_add_loopback_route: insertion failed

and

Feb  2 16:46:02 <kern.info> 9milegate kernel: lla_rt_output: 
RTM_ADD publish (proxy only) is invalid

I thought that the problem might be mpd, and so switched to 
userland PPP with PoPToP -- a combination that has worked for me 
before. But I saw similar messages:

Feb  2 18:22:35 <user.notice> testgate ppp[1184]: tun2: testuser 
pptpnocrypto connected as 172.18.4.26
Feb  2 18:22:39 <daemon.warn> testgate ppp[1187]: tun3: Warning: 
iface add: ioctl(SIOCAIFADDR, 172.18.0.1 -> 172.18.4.8
9): File exists
Feb  2 18:22:39 <kern.info> testgate kernel: 
ifa_add_loopback_route: insertion failed
Feb  2 18:22:39 <kern.info> testgate kernel: 
ifa_del_loopback_route: deletion failed

Ideas?

--Brett Glass

P.S. -- Please copy me directly on all responses, as I am not 
currently subscribed to the list.