Fwd: LAN-LAN VPN using PIXes and a dialup connection

[Stefan Pantke <seaside.ki () mac com>]

Am 25.06.2004 um 14:48 schrieb Melson, Paul:

> > -----Original Message-----
> > I have two LANs which are connected by a IPsec VPN tunnel
> > through 2 PIX 501 which connect to the internet by some
> > dialup line (ISDN).
> >
> > The tunnel itself performs well. Traffic passes correctly.
> >
> > The problem: Even if both LANs are switched off, the dialup
> > routers establish new connections. Since this is traffic on
> > IP protocol 50, it should be related to the IPsec connection.
> >
> > The questions:
> >
> > - Why do the PIXes establish VPN connections, even if no LAN
> > traffic has to be router through the VPN to the ohter LAN?
> >
> > - How to configure the PIXes for a VPN tunnel using a leased line -
> >    and not to connect each minute again...
>
> Why are you so sure that there's no LAN traffic reaching the PIX that
> would trigger the VPN tunnel to come up?

Because I use the nets 192.168.1.0/24 and 192.168.0.0/24 on the
both connected LANs.

Thus, I supposed, NetBIOS broadcasts will not be propagated to
the remote LAN.

Traffic appears as well during nights, when only one Linux Server
is running in each LAN.

On this server, SAMBA, Lotus Notes and BIND.8 are executed:

- the SAMBA servers are not connected to each other
- Lotus Notes does it's replication each 4 hours
- BIND is authoritative for 2 local zones and does not
  answer requests from the internet.

> It's going to depend on your
> crypto map match access-list, but dumb things like NetBIOS broadcasts,
> routing protocols, routing errors, etc. cause a tunnel to come up 
> and/or
> stay up.  If you run 'show crypto ipsec sa' on the PIX after the tunnel
> comes up and you don't think it should've, what SAs are you seeing?
> That ought to help you find the culprit.

Will be done this weekend and then posted...

Stefan

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