Date: Fri, 9 Sep 2011 22:15:29 +0100 From: "Torsten Kersandt" <torsten@cnc-london.net> To: <freebsd-pf@freebsd.org> Subject: RE: VPN problem Message-ID: <033001cc6f35$9a68efe0$cf3acfa0$@net> In-Reply-To: <201109091646.15327.lobo@bsd.com.br> References: <201109091646.15327.lobo@bsd.com.br>
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HI Mario
I don't know what the experts are suggesting and I would like to get
educated as well but I use a table for the VPN addresses
To allow nat but block them from using the server as gateway ("use as
default gateway" in VPN disabled in windows)
I add the rules dynamically using mpd if-up and if-down scripts
All I have in my rules is GRE pass anywhere and "nat <table> to and from"
where ever
Regards
Torsten
-----Original Message-----
From: owner-freebsd-pf@freebsd.org [mailto:owner-freebsd-pf@freebsd.org] On
Behalf Of Mario Lobo
Sent: 09 September 2011 20:46
To: freebsd-pf@freebsd.org
Cc: freebsd-questions@freebsd.org
Subject: VPN problem
Hi;
I've been having this problem establishing a VPN behind a FreeBSD 8-STABLE
with pf.
I have this scenario:
home LAN ---- FBSD+pf home ---- INTERNET --- FBSD+pf work --- work LAN
MPD VPN server
nat rules on FBSD+pf home:
nat on $ext_if from $int_if:network to any -> ($ext_if) port 1024:65535
# nat on $ext_if from any to any -> ($ext_if) port 1024:65535
obs- it makes no difference which nat rule I use. The problem persists.
These are the first 5 pf rules on FBSD+pf home:
# pass quick all
pass quick on lo0 all
# my whole home lan is free
pass in quick on $int_if from $int_if:network to any
#--- Allow networks to see themselves and dns
pass quick from $int_if:network to $int_if:network
#--- Allow vpns from anywhere to anywhere
pass in quick log on $int_if proto gre from any to any keep state
pass in quick log on $int_if proto tcp from any to any port pptp flags
S/SA
keep state
On any attempt to connect to the FBSD+pf work VPN Server from home LAN,
I get this (even if I uncomment pass quick all):
#>mpd5
Multi-link PPP daemon for FreeBSD
process 98799 started, version 5.5 (root@Papi 16:55 3-Sep-2011)
CONSOLE: listening on 127.0.0.1 5005
web: listening on 127.0.0.1 5006
[B1] Bundle: Interface ng0 created
[L1] [L1] Link: OPEN event
[L1] LCP: Open event
[L1] LCP: state change Initial --> Starting
[L1] LCP: LayerStart
[L1] PPTP call successful
[L1] Link: UP event
[L1] LCP: Up event
[L1] LCP: state change Starting --> Req-Sent
[L1] LCP: SendConfigReq #1
[L1] ACFCOMP
[L1] PROTOCOMP
[L1] ACCMAP 0x000a0000
[L1] MRU 1486
[L1] MAGICNUM 2d08ae01
[snip..]
[L1] LCP: SendConfigReq #10
[L1] ACFCOMP
[L1] PROTOCOMP
[L1] ACCMAP 0x000a0000
[L1] MRU 1486
[L1] MAGICNUM 2d08ae01
[L1] LCP: parameter negotiation failed
[L1] LCP: state change Req-Sent --> Stopped
[L1] LCP: LayerFinish
[L1] PPTP call terminated
[L1] Link: DOWN event
[L1] LCP: Close event
[L1] LCP: state change Stopped --> Closed
[L1] LCP: Down event
[L1] LCP: state change Closed --> Initial
BUT, on the 9th or 10th attempt, without touching any setting anywhere, the
VPN MAY BE established. out of nothing ! Machines (Windows, Unix, whatever)
behind both FBSD+pfs ALSO have the same problem when trying to close VPN
tunnels to outside sites.
Sometimes, opening an ssh session from my workstation to FBSD+pf work may
"help" in establishing the VPN.
The FBSD+pf work VPN Server is working fine. My colleagues can connect to it
from their homes (NATted cable modems or 3G modems) without problems. I am
the
only one behind a FBSD+pf router.
I installed MPD5 on FBSD+pf home, and copied mpd.conf from my home
workstation
to it.
Without touching a single setting on mpd.conf, the VPN is established
from FBSD+pf home (as a client) to FBSD+pf work WITHOUT any hiccups on EVERY
SINGLE attempt! even I bring it up/down 200 times!
And yet, if the FBSD+pf combo is out of the way, (i.e. no NAT!, as is the
case
of FBSD+pf home as a client) or if I let my cable modem do the NAT/routing,
the problem is GONE!.
FreeBSD work
FreeBSD 8.2-STABLE #0: Mon Aug 22 14:50:42 BRT 2011 amd64
FreeBSD Home
FreeBSD FreeBSD 8.2-STABLE #0: Wed May 18 16:53:26 BRT 2011 i386
Any suggestions?
Thanks,
--
Mario Lobo
http://www.mallavoodoo.com.br
FreeBSD since 2.2.8 [not Pro-Audio.... YET!!] (99% winblows FREE)
--
Mario Lobo
http://www.mallavoodoo.com.br
FreeBSD since 2.2.8 [not Pro-Audio.... YET!!] (99% winblows FREE)
Mario Lobo
http://www.mallavoodoo.com.br
FreeBSD since 2.2.8 [not Pro-Audio.... YET!!] (99% winblows FREE)
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