Teksavvy cable modems

[Ansar Mohammed]

So anyway I figured out what the issue was.
I had thee systems connected on the external VLAN (Cable modem,
existing firewall and my new firewall). The new firewall will not get
a DHCP lease if the old one still has a valid lease. It seems that
Teksavvy won't allow more than one system with a public IP behind the
cable modem.

I had to set the existing firewall with a static IP and power recycle
the cable modem.

Just a bit of a background: My new firewall is a thin client running
FreeBSD 8.2 with a single 100Mb/s interface. I use VLAN trunking to
the thin client and then create psuedo-interfaces on FreeBSD.

On Sat, Mar 10, 2012 at 3:31 PM, James Knott <james.knott-bJEeYj9oJeDQT0dZR+AlfA at public.gmane.org> wrote:
> Ansar Mohammed wrote:
>>
>> Thats pretty much my exact configuration.One additional note, I am
>> using 801.q VLANs. If you are having issues getting the GS108E to work
>> ping me offline and I will show you my config. I do have VLAN trunking
>> enabled.
>>
>> I tested the VLANs without the router and they appear to be properly
>> configured.
>>
>> I guess the fundamental questions here are
>> 1. If I plug my Cable modem and firewall into a hub or switch, will
>> they work just as if i connected them "back to back". i.e. I am issued
>> a non RFC 1918 address and I am "on" the internet.
>> 2. If I plug my cable modem onto a network segment with more than one
>> system that is configured with DHCP how many IP Addresses will
>> Teksavvy issue to me?
>
>
> The fundemental question is how is the port the modem is connected to
> configured?  If a "trunk" port, then it will passs VLAN tags, which may
> confuse the modem.  If an "edge" or "access" port, then it's assigned to a
> specific VLAN and will not pass the tag to the modem.
>
>
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