Re: Hidden ISP firewall/filtering

[Kurt Buff <kurt.buff () gmail com>]

On Wed, May 26, 2010 at 09:54, Jerrod Fuller <jfuller () whitesboots net> wrote:
> I recently purchased a Watchguard XTM2 to handle our firewall and VPN with
> IPSec, but when attempting to connect via VPN with IPSec, it gives a message
> of “VPN gateway not responding (waiting for MSG2)”  I have removed our
> watchguard from the network and when I do a “shields up” scan it shows all
> ports being closed.  Long story short . . . does anyone know if there is a
> way to find out if our ISP actually has a firewall/filtering in place, or b)
> have any other thoughts.

Layer 4 traceroute (http://pwhois.org/lft/) comes to mind, or nmap,
against a remote target controlled by you.

Kurt
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