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Comcast Bussiness Class and GRE Tunnels

On Tue, Jul 26, 2011 at 11:38 AM, PC <paul4004 at gmail.com> wrote:

> I have GRE tunnels and l2tp tunnels over those comcast boxes.  l2tp is less
> hassle because it handles NAT, but you can do GRE instead -- just make sure
> you assign yourself a public static IP.
> First, go into the gateway and make sure all firewalls are disabled (it has
> a web GUI).
> Second, if it's the comcast SMC 4 port "gateway" thing I think it is, the
> device is somewhat retarded.  You plug into the switch and pull DHCP, and
> you get a natted address and it routes.
> You can plug into the same switch and set a static IP on your device
> (internet public IP), and it will work without NAT, assuming your account
> has a static IP.
> Set said static IP on your microtik box and it should pass end-to-end
> without drops.
Was working on the same reply as Paul.  You assign your static to your
Mircotik box and check the box in the WebGUI (default is
to "Disable Firewall for True Static IP Subnet Only" on the firewall tab.