Alan Dayley said:
> I have a network configuration problem.  Not being an experienced admin
> with IP addresses and the like, I am not sure what I am doing wrong.
> Here is the setup:
>
> Internet----DSLRouter----Switch----LocalDNSServer
>                            | \-----LocalDHCPServer
>                            \-------LocalWorkstations...
>
> The DSLRouter is set to give a fixed IP to the switch, say
> 192.168.0.254. The DNSServer and DHCPServer provide those services to
> the Workstations.  They have IP addresses, let's say, of 192.168.0.1 and
> 192.168.0.2. The DNSServer and DHCPServer are configured to use
> 192.168.0.254 as the default gateway, which is also passed on to the
> Workstations.
> The netmask throughout all of this is 255.255.255.0.
>
> What I want to do is this:
>
> Internet----DSLRouter----Firewall----Switch----LocalDNSServer
>                                        | \-----LocalDHCPServer
>                                        \-------LocalWorkstations...
>
> The Firewall will have fixed IPs on both connections, outside the
> DHCPServer range.  We'll say that the connection to the DSLRouter is
> 192.168.0.253 and to the switch is 192.168.0.3.
>
> The problem is that when I put the firewall in the path, I get now
> Internet access anywhere.  If I set the gateway on DNSServer and
> DHCPServer to 192.168.0.3, I still get nothing.  Assuming the firewall
> iptables are configured right (it is an IPCop install), what is wrong
> here?  Are my IP addresses messed up somehow?  Perhaps I should enable
> DHCP in the DSLRouter and let the firewall get the IP on that interface
> via DHCP?
>
> I want to get this done tonight so any quick help would be appreciated.

I have solved this problem.

What I did (after the light went on) was set the IP of the firewall on the
Switch side to the IP that the DSLRouter had on the switch side.  I
changed the DSLRouter IP to something else (didn't matter what).  Now, all
is happy without having to change anything on the servers.  Now, finally,
I can go home.

Alan



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