EMac 10.4.11 connected to iMac 10.6.6 via ethernet loses connection?

My iMac is connected wirelessly to my router and my old eMac is connected to my iMac with an ethernet cable, though I rarely use the eMac on the internet.
Both yesterday and today when I tried to access the internet on my eMac, there was no connection.
I looked in the iMac's System Preferences>Sharing and saw that the "Internet Sharing" option was still selected.
After a bit of puzzling I switched the Internet Sharing off and back on again.
On both occasions the internet connection was restored immediately.
Any ideas why the connection could be getting lost?
I don't want to open my iMac's System Preferences every time I use my eMac for web surfing.

This question was answered in another thread. The solution is here:
http://discussions.apple.com/thread.jspa?messageID=12694507
Thank you Julie.

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dpm,
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I have a 2004 lamshade G4 800mhz imac running 10.4.11
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Is there any way to connect the imac to the macbook with an ethernet cable and use the macbooks internet on the imac? If so, can you give me the step by step directions?

Connect an ethernet cable from the MacBook to the iMac.
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Set the options so they look like this:
except click the checkbox so internet sharing is "on." (I didn't turn it on when I made the screnshot.)
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We have a small office network connected to an Efficient Networks DSL router that's managed by our isp. The router has 4 ports and a linksys 8 port switch is connected to one of those ports. Another D-Link wireless router/switch is connected to another port.
2 i-macs connect without problem via ethernet cable. They are set to DHCP and get 192.xx private addresses. Both run 10.4.5. Another older imac running 9.2.2. also has no problems.
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Tim,
Thanks for your help. Here's what I've done before reading your e-mail. The D-Link DI-524 wireless router is connected to the Effiicent Neworks DSL router as you mentioned. One ethernet port of the EFF.Net. router is connected to the WAN port of the DI-514.
Because I have a D-Link router at home which works flawlessly with my powerbook, I decided to connect the ethernet cable of the powerbook to the D-Link which has 4 ethernet ports. Lo and behold, the powerbook acquired a private ip address and connected to the LAN and internet!
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Having spent hours reading about network problems, I think it's safe to say that macs have problems with certain routers. Why a G5 works and a powerbook G4 doesn't is beyond me, but clearly software must play a role.

EMac 10.4.11 connected to iMac 10.6.6 via ethernet loses connection?

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