default gateway question

Hi,

I noticed that my router's default gateway is 192.168.0.1 - that's ok i
understand about ip's reserved for lans. However the router says in its
setup that I have another default gateway which is my IP with the last
octet as 1 ie a.b.c.1 where my ip is a.b.c.d

Ok, what's the point of this one?

thanks.

On Wed, 19 Dec 2007 09:26:32 +0000, strangelove wrote:

>
> Hi,
>
> I noticed that my router's default gateway is 192.168.0.1 - that's ok i
> understand about ip's reserved for lans. However the router says in its
> setup that I have another default gateway which is my IP with the last
> octet as 1 ie a.b.c.1 where my ip is a.b.c.d
>
> Ok, what's the point of this one?
>
> thanks.

BY IP I mean my router's WAN IP.

"strangelove" <(E-Mail Removed)> wrote in message
news:fkao48$otp$(E-Mail Removed)...
>
> Hi,
>
> I noticed that my router's default gateway is 192.168.0.1 - that's ok i
> understand about ip's reserved for lans. However the router says in its
> setup that I have another default gateway which is my IP with the last
> octet as 1 ie a.b.c.1 where my ip is a.b.c.d
>
> Ok, what's the point of this one?

There are two quite separate networks, and the function of your router is to
join them together.

On the "inside" of your router, your Local Area Network (LAN) comprises a
port on the router, and the various computers you have connected to the
router. In the router a function called the DHCP server issues IP addresses
to the computers on the LAN. The IP address of the router is fixed in its
setup screen. The DHCP server issues several paramaters to the requesting
computer, amongst which are:

1) the IP address for that computer
2) the IP address that the computer must use as its "default gateway". This
is the address that the computer uses when it recognises that it needs to
send a packet to another computer not on the Local Network. This is the IP
address of the router.

On the "outside" of your router, the Wide Area Network (WAN) comprises
another port on the router and the connection to your ISP. (Logically
speaking) at your ISP there is another DHCP server. It responds to your
router by issuing it with an IP address, and a default gateway on the ISP's
network. Your router therefore sends packets addressed to other computers
not on the WAN to this default gateway, where in turn another (more
sophisticated) router works out how to forward your packet to the correct
destination. Google for a more detailed and accurate description of theis
process.

The job of your router is to forward packets arriving on its internal LAN
port (from a local computer) across itself and out of the WAN port. This is
what the word "route" means. The router also keeps details of the recently
forwarded packets. When incoming packets arrive at the WAN port, the router
checks that they are legitimate responses to outgoing packets and forwards
them to the computer on the LAN which made the original request. In this
the router functions as a simple firewall: it only allows in packets which
are legitimate responses to outgoing traffic.

--
Graham J

On Wed, 19 Dec 2007 10:09:45 +0000, Graham J wrote:

Now answer my question instead of cutting and pasting bollox. And remember
I am familiar with lans and the use of internal IP's.



>
> "strangelove" <(E-Mail Removed)> wrote in message
> news:fkao48$otp$(E-Mail Removed)...
>>
>> Hi,
>>
>> I noticed that my router's default gateway is 192.168.0.1 - that's ok i
>> understand about ip's reserved for lans. However the router says in its
>> setup that I have another default gateway which is my IP with the last
>> octet as 1 ie a.b.c.1 where my ip is a.b.c.d
>>
>> Ok, what's the point of this one?
>
> There are two quite separate networks, and the function of your router is to
> join them together.
>
> On the "inside" of your router, your Local Area Network (LAN) comprises a
> port on the router, and the various computers you have connected to the
> router. In the router a function called the DHCP server issues IP addresses
> to the computers on the LAN. The IP address of the router is fixed in its
> setup screen. The DHCP server issues several paramaters to the requesting
> computer, amongst which are:
>
> 1) the IP address for that computer
> 2) the IP address that the computer must use as its "default gateway". This
> is the address that the computer uses when it recognises that it needs to
> send a packet to another computer not on the Local Network. This is the IP
> address of the router.
>
> On the "outside" of your router, the Wide Area Network (WAN) comprises
> another port on the router and the connection to your ISP. (Logically
> speaking) at your ISP there is another DHCP server. It responds to your
> router by issuing it with an IP address, and a default gateway on the ISP's
> network. Your router therefore sends packets addressed to other computers
> not on the WAN to this default gateway, where in turn another (more
> sophisticated) router works out how to forward your packet to the correct
> destination. Google for a more detailed and accurate description of theis
> process.
>
> The job of your router is to forward packets arriving on its internal LAN
> port (from a local computer) across itself and out of the WAN port. This is
> what the word "route" means. The router also keeps details of the recently
> forwarded packets. When incoming packets arrive at the WAN port, the router
> checks that they are legitimate responses to outgoing packets and forwards
> them to the computer on the LAN which made the original request. In this
> the router functions as a simple firewall: it only allows in packets which
> are legitimate responses to outgoing traffic.

strangelove wrote:
> On Wed, 19 Dec 2007 10:09:45 +0000, Graham J wrote:
>
> Now answer my question instead of cutting and pasting bollox. And remember
> I am familiar with lans and the use of internal IP's.
>
>

In that case you should know the answer.

PeeGee
--
The reply address is a spam trap. All mail is reported as spam.
"Nothing should be able to load itself onto a computer without the
knowledge or consent of the computer user. Software should also be able
to be removed from a computer easily."
Peter Cullen, Microsoft Chief Privacy Strategist (Computing 18 Aug 05)

strangelove writes:

> Now answer my question instead of cutting and pasting bollox. And remember
> I am familiar with lans and the use of internal IP's.

Your PC(s) needs to know where to send packets outside of your local IP
address range - presumably destined to the Internet, so this is your
router. Default gateway on your PC is therefore 192.168.0.1.

Your router needs to know where to send packets outside of your local IP
address range. The default gateway is your public IP with .1 (but not
necessarily .1) in place of the final number.

"strangelove" <(E-Mail Removed)> wrote in message
news:fkas1t$tkf$(E-Mail Removed)...
> On Wed, 19 Dec 2007 10:09:45 +0000, Graham J wrote:
>
> Now answer my question instead of cutting and pasting bollox. And remember
> I am familiar with lans and the use of internal IP's.
>

What a rude, ungrateful prat you are.

"strangelove" <(E-Mail Removed)> wrote in message
news:fkas1t$tkf$(E-Mail Removed)...
> On Wed, 19 Dec 2007 10:09:45 +0000, Graham J wrote:
>
> Now answer my question instead of cutting and pasting bollox. And remember
> I am familiar with lans and the use of internal IP's.
>
>


Then you will know the answer. Why don't you google it instead of flaming
the person who tried to help you.

strangelove wrote:
> On Wed, 19 Dec 2007 09:26:32 +0000, strangelove wrote:
>
>> Hi,
>>
>> I noticed that my router's default gateway is 192.168.0.1 - that's ok i
>> understand about ip's reserved for lans. However the router says in its
>> setup that I have another default gateway which is my IP with the last
>> octet as 1 ie a.b.c.1 where my ip is a.b.c.d
>>
>> Ok, what's the point of this one?
>>
>> thanks.
>
> BY IP I mean my router's WAN IP.
>
Every networkable device on te internet has to know a route to here it
wants to send data. That changes according to where it is.

Your local net forwards all (non local) stuff to 192.168.0.1,because
that is your router.,

Your router howeever,needs to forward all its non localt stuff not to
itself, but up the line to your ISP. So IT has a default route pointing
there.

Once inside the ISP, the routers there will in all probability run OSPF
which they will use to carry routing tables around inside the network,
and then probably have one or more default routes to other ISPs via one
or more boundary routers that WILL carry full internet wide routing
tables and use BGP to interface to other ISPS.

Thank your starts you don't have to know anything about all that, and
have only two default routes to worry about..

On Wed, 19 Dec 2007 10:33:33 UTC, strangelove
<(E-Mail Removed)> wrote:

> On Wed, 19 Dec 2007 10:09:45 +0000, Graham J wrote:
>
> Now answer my question instead of cutting and pasting bollox. And remember
> I am familiar with lans and the use of internal IP's.

Then do it yourself instead of being objectionable.

--
[ 7'ism - a condition by which the sufferer experiences an inability
to give concise answers, express reasoned argument or opinion.
Usually accompanied by silly noises and gestures - incurable, early
euthanasia recommended. ]