Comcast Bussiness Class and GRE Tunnels

Tue Jul 26 15:45:30 UTC 2011

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 http://10.1.10.1)
to "Disable Firewall for True Static IP Subnet Only" on the firewall tab.

-Jon