Re: DNS Over a Segment

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Bill (Bill_at_discussions.microsoft.com)
Date: 02/22/05 

Date: Tue, 22 Feb 2005 06:27:01 -0800

"Roland Hall" wrote:

> "Bill" wrote in message
> news:F2BA7E02-937A-4BCD-8829-3401BABE26D7@microsoft.com...
>
> : I'm not sure what your asking about physical connections being correct.
> On
> : segment-1, the ISP Router, Cisco-Router-1, and the DC/DNS all plug into
> the
> : same switch. On segment-2, the router & all PC's connect to the same
> switch.
> :
> : I do not have assigned addresses from my ISP. I have a static IP on my
> LAN
> : side.
> :
> : On the ISP Router WAN side the settings are
> : IP 209.143.5.191,
> : Subnet 255.255.255.0,
> : Default Gateway 209.143.5.1,
> : DNS 209.143.0.10
>

> What is the LAN side of the ISP's router? The WAN side was not needed.
> Why do you need two routers for two networks?

I was told by the ISP I needed an additional router to attach to our
network. Could we have connected the Internet Modem to our CISCO router via
the switch?

> It appears you have a router from the ISP at your location but it's fuzzy
> from there. Does the ISPs LAN connection connect to a switch? You have a
> 192.168.x.x network Serial-Serial between your two routers. You have two
> different Class B networks with two routers. So, the ISPs LAN side address
> is probably on the same subnet as Router1.

Yes, the router from the ISP connects to a switch, the same switch as
Router-1 and the DC/DNS server.

The 192.168.x.x was there when I inherited the system. I'm not sure if it
was used for anything or was just a default entry. The only connection
between the routers is the Fastethernet0/0. Does that mean the Serial-Serial
setup is ignored?

Yes, the ISPs LAN side address is the same subnet as Router1 and also the
DC/DNS server.

>
> Is this what you have:
>
> ISP ROUTER] (LAN IP? 172.20.100.200 maybe?) -> [switch] -> 172.20.100.10/16
> [Router1] 192.168.1.1/24 -> 192.168.1.2/24 [Router2] 172.21.100.10/16 ->
> [switch]

Yes, that looks pretty much right. We are using the Fastethernet0/0 so I
don’t think the 192.168.x.x (serial) applies here but I could be very wrong!

>
> Router1's DFG is 192.168.1.2 WHY? Appears to be wrong. If 172.20.100.200
> is the ISPs LAN IP address, then it should be that: 172.20.100.200
Good question! I’ll try changing this.

> Router2's DFG is 192.168.1.1 which appears to be correct.
OK

>
> Host: RM16 - remove 2nd gateway 172.20.100.10 You're not routing through
> Router1 to get to the net.

OK, I think this was setup this was to allow the HAT’s-Dell-2 to access a PC
on the second gateway in addition to accessing the internet.

> Host: Hats-Dell-2 - remove 2nd gateway 172.20.100.200 Your DFG is the LAN
> side of Router2, not the LAN side of the ISPs router.

OK, I’ll make the change!

>
> Also, you need a route back to the 172.21.0.0/16 network on the ISPs router.
> Otherwise it will think you are on the Internet and never route back to you.
> Your border router needs to know about all of your private networks. The
> private networks only need to know neighbors.

OK, I’m not sure how to configure this in the ISP router but will work on it!
>

> If LAN1 and LAN2 are connecting to the same switch, you have other issues.

Should be ok here, they connect to two separate switches on either side of
the T-1.

>
> Don't forget to change your enable secret passwords on your routers
> immediately. If you don't control your ISPs router at your location, you
> need to notify them right away to make config changes.

Taken care of!

Many thanks!!!

>
> --
> Roland Hall
> /* This information is distributed in the hope that it will be useful, but
> without any warranty; without even the implied warranty of merchantability
> or fitness for a particular purpose. */
> Online Support for IT Professionals -
> http://support.microsoft.com/servicedesks/technet/default.asp?fr=0&sd=tech
> How-to: Windows 2000 DNS:
> http://support.microsoft.com/default.aspx?scid=kb;EN-US;308201
> FAQ W2K/2K3 DNS:
> http://support.microsoft.com/default.aspx?scid=kb;EN-US;291382
>
>
>

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