ralphjohns.co.uk/

Historical Document

These pages have sat here since 2008 with no update. In that time the AIM servers have been closed down (2017) and iChat has been superseded by Messages. That effectively make this a sort of Historical Document of how it worked.

I will make attempts to renew and refresh Links to either the most current site or use the Way Back Machine Archive so that people can at least look at what was used. I will make Edit Notes on this and on those where I can find no link to replace the older one as I go through the document.

Modem and Routers

iChat In Pictures >> You are in Folder 8_Modem:Router And it's Sub Folder Linksys Router >> Page: LAN Side DHCP

2[5]

2 Router DHCP LAN (computer) Side

02-10-2006

This is the bottom of the previous picture in this series. It shows the LAN settings. From the router (this device), to the computers.

Again DHCP is turned off. (Arrow 2) This means the computers will have to be set to Static Routing. I did this on mine to increase security and for little other purpose as this device has UPnP and could have been left doing DHCP with UPnP enabled.

It shows that this device can change the range of it's DHCP issued IPs and the number of those IPs in the DHCP range if it is on. For your computer you can then choose, when setting Static IPs any number for this device that starts 192.168.1. The last number can be anywhere between 1 and 255 except the one the device has itself (192.168.1.1 in this case - Arrow 1). To help avoid confusion the DHCP range normally starts at .100 (Arrow 3)

A note about LAN IP ranges. There are three reserved ranges for LANs. The one this modem uses of 192.168.xxx.xxx, the one the modem in this set up uses of 10.xxx.xxx.xxx and a leesser used 172.16.xxx.xxx to 172.32.xxx.xxx

Most commonly the modem or router is the "number one" device as in 192.168.1.1 or 10.0.0.1 but in some cases the device uses an IP that appears more Out-of-the-way as this one does with 10.0.0.138 hence me saying "except the one the Device uses" above.

Why Did I Do This ?

If you leave two devices that can do DHCP actually doing it the computers on your LAN get an IP issued from both. The confusion comes from the computer only displaying one of these. In some cases you might your Airport card to join one network and the Ethernet to join another. The problem is not many applications have been written to pick one over another and iChat certainly has problems when it can "See" two Networks.

Turing DHCP Off in the Modem and setting that side of the router to Static means that that subnet now only uses two IPs the modem's own and the one the router is using. As the router is a Wireless device using specific IPs for just my computers means it is difficult for other outsiders to get on to my network.

At the bottom of the picture is where the time is set in the form of a Time Zone. This one does not have a tick box for Daylight Saving adjustments so you have to make manual 1 hour shifts at times.

Next:- Port Forward settings

Upward Arrow saying Top Top of page

Created with JAlbum 4.0.6

© 2005 Ralph Johns: Edited 24/9/2005, 5/5/2006
Updated September 2006
Updated October 2008. Reviewed and Updated to HTML 5 October 2024

Information Block

This site is about iChat from Version 1 through to iChat 5.x.x
Mostly this is kept as an Historical Document. Some small tense changes have been made but the content is by and large untouched.

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

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

Options to This Page

To the right you can resize or colour the page as well as choose one of three Fonts.

About This Page

Where to turn Off DHCP in the Router. In this device the WAN (Internet side) and the LAN (Computer side) are top and bottom of the same page. You may have two separate pages to do the things in this and the previous picture.

This page also talks about (again) the groups of Private IP addresses.

It also highlights that this device's access point in the 192.168.1.1 address but DHCP would normally start at the .100 point. It also then has a default 50 set as the number of IP adressed that can be used. It confirms the range that will be used.

A note about connecting to a Time Sever is made as well as Daylight Saving tick box which this does not have.

Compatibility

Much of this page has been altered to be as HTML 5 compatible as possible. This may cause issues with any of the Browser below.

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.

Previously confirmed to work 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) may only see a text-based page which, while not the prettiest option, is still entirely usable.