Re: gateway IP address
- From: "erik.freitag@xxxxxxxxx" <erik.freitag@xxxxxxxxx>
- Date: 5 Jul 2006 04:09:29 -0700
mike7411@xxxxxxxxx wrote:
Could someone refer me to a good explanation of how the gateway IP
address is used in
networking?
A good reference would be Comer's Internetworking with TCP/IP, Volume
I, Principles, Protocols and Architecture. Relevant chapters would be
Chapter 5 Mapping Internet Addresses To Physical Addresses (ARP), and
the Routing chapters.
I have a Cisco ATA186 analog telephone adapter, and it requires me to
configure gateway IP address. It only has one RJ45 Ethernet port, so
shouldn't it just be sending all the packets out of the port? Why
would it need a gateway IP address?
The gateway IP tells the client (the ATA186 in this case) where to send
packets that are not on the same subnet or subnets as directly attached
interfaces. In this case, since there is only one interface there will
likely be only one attached subnet. The gateway IP tells the client
where to send packets that are not on that subnet.
Since a router attached to a subnet can pretend to be any host not on
the same subnet if proxy-arp is enabled, a gateway IP is not always
necessary, even when the client has multiple interfaces.
If you are always sending packets to the same subnet, neither a gateway
IP nor proxy-arp is needed, although it sounds like your client still
wants you to enter one.
In any case, the gateway IP has nothing to do with the number of
interfaces your device has.
.
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