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gibsond7
Member since:
2002-08-27 16:14:10 |  posted: 2002-08-28 05:39:43
VPN problems
----------
I tied to set up a VPN
and it is not working.
Win XP tells me that it
is unable to establish
the VPN becaues the
server may be unreachable
or security parameters
may not be properly
configured.
Let me
tell you my setup so you
will hopefully be able to
help me better. I am
with a city government
and I have the server in
my building running Win
2000 Server. We connect
to the internet via an
ISDN line which has a
fire wall. I had the
port 1723 forwarded to
get past the firewall in
the ISDN router. My
network is set up using
NAT. I plan to have
around 15 people dial in
to my server when
completed. Can you help
me figure out what might
be the problem. I have
no real knowldege of
VPNs, but i did try to
install it on my server.
I would appreciate any
help. Thanks - David | Thomas
Member since:
2002-09-06 01:43:02 |  posted: 2002-09-06 01:57:17
NAT is the problem
----------
I was trying the same
thing some weeks
ago.
It was not
possible to forward all
needed traffic to the
VPN-Server behind the NAT
router.
Both sides are
sending GEP (or something
like that) packets which
can not be forwarded
easily.
Some hardware
routers support VPN
forwarding as a special
feature. Linux router
will need a kernel patch
and some additional
software.
Thomas | metro305
Member since:
2002-09-12 02:53:48 | posted: 2002-09-12 03:17:14
GRE Protocol 47?? Put a
sniffer and see whats
going on www.ethereal.com
----------
Perhaps an edge device
like router/ISDN TA or
even your ISP do not pass
protocol 47 traffice this
MAY BE preventing the
actual tunneling to
occur.
The ports
1723 initiate and
coordinate the PPTP
connection then this is
followed by encapsulation
of VPN data into GRE
packets. GRE IS A
PROTOCOL not a PORT - a
common mistake.
Here is some a
link about
it.
http://support.mic
rosoft.com/default.aspx?s
cid=KB;EN-US;Q241251&
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