Digital Subscriber Line PPPoA and bridging DSL modems

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Subject Author Date
PPPoA and bridging DSL modems dave 02-16-06
Posted by on February 16, 2006, 1:07 am
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Hi,

Do you know if it is possible to bridge a modem doing PPPoA to a router
that supports PPPoE? Will the modem pass the authentication
information along?

I will be working with an Actiontec GT701-wg DSL modem and a Sonicwall
TZ170. The Sonicwall can do PPPoE but the DSL account will be DHCP and
PPPoA. I want the Sonicwall's external interface to be assigned the
public IP. Is this doable?

Thanks,
Dave


Posted by on February 16, 2006, 1:12 am
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A better question might be can I put the modem in bridged mode, have
the modem do PPPoA and the firewall receive the dynamic IP?

Thanks.


Posted by Jim on February 16, 2006, 2:41 pm
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dave@berryhillsoftware.com wrote on 2/16/2006 1:07 AM:
> Hi,
>
> Do you know if it is possible to bridge a modem doing PPPoA to a router
> that supports PPPoE? Will the modem pass the authentication
> information along?
>
> I will be working with an Actiontec GT701-wg DSL modem and a Sonicwall
> TZ170. The Sonicwall can do PPPoE but the DSL account will be DHCP and
> PPPoA. I want the Sonicwall's external interface to be assigned the
> public IP. Is this doable?
>
> Thanks,
> Dave
>
You cannot bridge oA to any router. What you can do is use the oA on the
Actiontec and then tie off to the Sonicwall WAN port with no NAT. Set up
rules as appropriate.

Unless this is a business, that is overkill. Are you hosting any
servers? If not, just use NAT. Any hacker would have to hack your WAN
management on the Actiontec (if there is any) in order to gain access.
Your biggest security hole is when you start hosting servers and
allowing people access to internal resources.

Jim

Posted by on February 16, 2006, 8:37 pm
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Hi, Thanks for the reply. I need to create a VPN between a bookmobile
and a library. The bookmobile makes stops at various locations. Half
of the locations will get DSL from one provider and half from another.
I'm using the SonicWall to create the VPN. I want to be as sure as
possible that the SonicWall will be able to build the VPN. I'm pretty
sure if I use aggressive mode on the VPN that all will be well. We
want to minimize setup by the bookmobile staff. Ideally they would
just swap out DSL modems and power up the sonicwall. A few pings of
the server should rebuild the VPN. Hopefully....


Posted by Jim on February 16, 2006, 9:15 pm
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dave@berryhillsoftware.com wrote on 2/16/2006 8:37 PM:
> Hi, Thanks for the reply. I need to create a VPN between a bookmobile
> and a library. The bookmobile makes stops at various locations. Half
> of the locations will get DSL from one provider and half from another.
> I'm using the SonicWall to create the VPN. I want to be as sure as
> possible that the SonicWall will be able to build the VPN. I'm pretty
> sure if I use aggressive mode on the VPN that all will be well. We
> want to minimize setup by the bookmobile staff. Ideally they would
> just swap out DSL modems and power up the sonicwall. A few pings of
> the server should rebuild the VPN. Hopefully....
>
Aggressive mode is difficult through a NAT router. Sonicwall may have a
way of doing it by now.

There are also IKE keep alives you could look into.

Jim

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