A Very Simple Question

[ps]

in article cu8g5i$chc$1 at sf1.isc.org, oh_cmon_thats_bullshit at yahoo.com at
oh_cmon_thats_bullshit at yahoo.com wrote on 2/6/05 6:56 AM:

> I have a static IP Address which is listed below.  My setup behind an
> SMC7004 NAT Router was as follows:
> 
> IP Address: XXX.YYY.154.236
> Subnet Mask: 255.255.255.0
> GateWay: XXX.YYY.152.1
> 
> Domain: AAA.BBB.64.222, AAA.BBB.64.223
> 
> The SMC wanted you to access him at 192.168.123.1
> 
> I then routed Port 80 to 192.168.123.254 which was a Linux webserver
> which had been assigned that IP address.
> 
> Ok, I decide to replace the aging SMC7004 and buy a NETGEAR WGT624
> (probably my first mistake) which wants to be accessed on 192.168.0.1.
> 
> So, I change the web servers IP to 192.168.0.200 and begin to configure
> the router using *the* *same* *exact* *parameters* as listed above.
> However it will not let me enter the Gateway address because its not
> the same at the third level.  It wants something in the XXX.YYY.154.xxx
> range.  So, I have to let it pick its own and therein must lie the
> problem I am guessing.
> 
> Not what is odd is that I get Internet service just fine (The WWW that
> is) but I cannot ping myself?  I have gone to www.whatismyip.com and it
> says I am at the address I am trying to ping.  Therefore, when I go to
> find my website via the Internet, it cannot be found via
> XXX.YYY.154.AAA.
> 
> I have had DSL since the early days and at that time Verizon provided
> the signal and a small company that has since become Isomedia provides
> the ISP service.  So, I call the ISP and the guy says I am NOT static
> IP which is a bold faced lie.  I prefaced the call by saying I was
> having trouble setting up my NAT router configuration, so he probably
> had lots of reasons not to talk to me, but still I am paying $32 to
> Verizon and 17.50 to Isomedia, so if I lose my static IP over this, so
> be it, the wesites are not high traffic and if my DSL drops to $30 a
> month, I can probably manage with a dynamic IP.
> 
> But I really want to know:
> 
> 1.  Why would SMC allow me to configure that way and not the new
> NETGEAR router?
> 

Because with a subnet mask of 255.255.255.0, the address XXX.YYY.154.236 is
not in the same subnet as the gateway you are trying to configure,
XXX.YYY.152.1. The SMC apparently doesn't do any kind of input validation,
while the Netgear does.