Ralph Johns

iChat Information Pages

iChat Icon

iChat

These pages are about iChat.

They consist of old info about iChat 1, 2 (AV), 3 as well as new stuff about the latest incarnation, iChat 5.

The info in these pages has been somewhat reorganized. I hope to make sure that things are grouped in a more logical order to explain somewhat how iChat has got from iChat (ver 1) though to the current iChat 5.x.x

The Menu at the top will contain everything but may change from page to page.

iChat, DHCP And overlapping LANs

This page contains two pictures and that essentially is it purpose.

The first shows a Modem and then a LAN. This is for Modem that routes.

The first picture, in terms of IP addresses, would apply where a modem that did not route, such as a Cable modem, was used with a Router

The second picture looks at the overlapping subnets and effectively hidden IP addresses when a modem routes and is used with a router when both are doing DHCP. The Picture is a layered .gif that builds slowly to hopefully demonstrate the issue more clearly.

This is not to say that a modem that routes and a router can not be used together but it is about how they are set up to work together.

Pictorial Representation of Home Network

This is about devices that route. Mainly about the pitfalls of adding a DHCP router to a LAN that has a DHCP Modem already.


Back to page 3
MOdem that Routes picture


The actual pictures that make up this diagram are for you to gain an idea only. Your computers and modem are likely to look different.


Back to page 3

Representation of a Modem and Router Network

Animated .gif Showing problems with overlapping DHCP servers

If it is too fast then Click and Drag it to your Desktop and open in a Graphics applictaion.

modem and Router overlap Animated gif

Back to page 3

Up Arrow and text icon

© 2005 Ralph Johns Edited 24/9/2005, 5/5/2006, 25/08/2007
Updated September 2006. Moved to Gargoyles and edited Mar 2007
Edited slightly for new Layout 8:47 PM Sunday; September 21, 2008
Major revision and Edit moving towardss HTML 5 in November 2024

Information Block

This site is about iChat from Version 1 through to iChat 5.x.x
It has had a major Edit in September 2024 moving towards being HTML 5 complaint. It has essentially become an Historical document on how things could be done in iChat.

It has a mixture of basic info and problem solving help.

The setions below will change for Specifics about info on the page on view

About This Page

Two pics looking at the pitfalls of adding a Second Routing device doing DHCP to a LAN that already has a DHCP server.

Compatibility

As mentioned above this has had a major Edit/Update in September 2024 meaning that the Browsers listed at the bottom are likely to no longer work.

I have tested in Safari 18.1, Firefox 130.x and 131.0, Vivaldi 6.9.3447.48 and iCab 6.2.3 (All Mac Browsers) I don't have access to a PC let alone multiple browsers to test on.

The original pages worked with Win/IE 5.5 and later (should work in 5.0, but not confirmed), Firefox 2, Safari 3, Opera 9, iCab 3.02 and later, Mac/IE 5, Netscape 6 and later

Old browsers (IE version 4 or earlier, Netscape 4 or earlier) should only see a text-based page which, while not the prettiest option, is still entirely usable.

Up Arrow and text icon