Loosing Internet (only) connectivity on an iMac C2D through ethernet

Hello there,
I've just got a iMac C2D 20" and it's connected to the network in the office through an SMC Gigabit Switch... Every computer has internet and so the iMac, but randomly every day at least once, it loses the internet (just the internet) meanwhile the internet is up and others are on it)...
I can ping other stations, and do local stuff on the network, but not with internet... and it only solves when I reboot...
Does anybody have a hint on this?
Best regards,
Cy

I am still having that problem. I called Applecare and the guy told me to Install an antivirus... I am serious... So he just recommended me that or to format the Hard Disk.
I thought that was just at the windows world

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Ok appears I solved my problem but not sure why.
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I purchased my first apple computer/imac this past week. My apple computer/mac knowledge is limited........
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Please test after taking each of the following steps that you haven't already tried. Stop when the problem is resolved. Back up all data before making any changes.
Step 1
Take the applicable steps in this support article. The Wireless Diagnostics program generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
Step 2
Disconnect all USB 3 devices. If you don't know which are USB 3, disconnect all USB devices except keyboard and mouse.
Step 3
If you're not using a wireless keyboard or trackpad, disable Bluetooth by selecting Turn Bluetooth Off from the menu with the Bluetooth icon. If you don't have that menu, open the Bluetooth preference pane in System Preferences and check the box marked Show Bluetooth in menu bar. Test. If you find that Wi-Fi works better with Bluetooth disabled, you should use the 5 GHz Wi-Fi band. Your router may not support it; in that case, you need a new router.
Step 4
Open the Network pane in System Preferences and make a note of your settings in the Wi-Fi service. It may be helpful to take screenshots of the various tabs in the preference pane. If the preference pane is locked, unlock it by clicking the padlock icon and entering your administrator password. Delete Wi-Fi from the service list on the left by selecting it and clicking the minus-sign button at the bottom. Then recreate the service by clicking the plus-sign button and following the prompts.
Step 5
Reset the System Management Controller.
Step 6
Reset the PRAM.
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Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first.
Step 8
Make a "Genius" appointment at an Apple Store, or go to another authorized service center.

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Can anyone help with this as it's driving me crazy. my new iMac keeps loosing it's Internet connection even though it remains connected to the Modem Router and reports great signal strength with the Wi-Fi signal.
A Bit of Background Info
3 days ago I bought a new 27" iMac this is the 3.1GHz Quad-Core Intel Core i5 model and currently has 4GB of RAM which I'll be updating to 16GB in a couple fo days. This machine came pre-installed with Lion.
I bought this to replace my older iMac a 2006 model which is running Snow Leopard. I also have a MBP which is around 6 months old (I bought it just before Lion was released) and this also has Snow Leopard on it. On top of this I have an iPhone 4 and my wife has an iPhone 3G.
All of these computers and phones connect to my Wi-Fi network which uses a Belkin N300 Wireless Modem Router. This router itself is only about 3 weeks old and replaced a much older Netgear one that just failed one day.
When I was setting up the new iMac I used Migration Assistant to move accounts, documents, settings, everything from the old Snow Leopard iMac to the new Lion iMac.There were a few problems at first in doing this which may or may not be the cause of the problem I'm now experiencing. I'm going from memory here so I'm not 100% sure of the precise details but I'm pretty sure it went something like this:
1. Turned on new iMac for the first time and was prompted to add it to my Wireless Network which I did.
2. Connected a CAT5 cable between both Macs
3. Ran Migration Assistant but it failed to detect the old iMac
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7. Aborted the migration but then both iMacs completely crashed and had to be rebooted by holding down the power button.
8. Rebooted new iMac but chose not to set-up Wi-Fi first and re-ran migration assistant with CAT5 cable attached. Transfer then worked taking around 3hrs.
9. On completion got a report saying that two programs hadn't been copied because they weren't compatible with Lion but both of these were programs I had previously uninstalled on the old iMac and this message was just referring to left over folders that hadn't been deleted.
10. Added the new iMac to my Wi-Fi network.
The Problem
The Modem Router is in the same room as the iMac (and all the other computers and phones for that matter) and is around 3 meters away from it with just a TV in between them and as such the Wi-Fi signal strength is always very strong on the new iMac (and all devices). However several times a day the new iMac just stops being able to access the Internet yet it remains connected to the Wi-Fi network. This happens whether I'm using the Internet on the new iMac at that time like surfing the web or downloading files or if I've just left the iMac on but am not using it. The cure is always the same and that is to right click on the Wi-Fi signal icon at the top of the screen, select Turn Off Wi-Fi and then turn it back on again. The length of time that I have working Interent on the new iMac can be a few minutes or a few hours it just seems pretty random.
When I do loose the Internet on the new iMac all the other computers and phones can still access the Internet and if I can still log into the router ON the new iMac and the routers status shows that it is still connected to the Internet. So the new iMac is connected to the router via Wi-Fi, the router is connected to the Internet but for some reason the new iMac just isn't getting the Internet anymore but if I turn Wi-Fi off and back on again on the new iMac it starts working again!
Things I've Tried
All the following are things I've tried without success.
1. Reboot the new iMac
2. Reboot the router
3. Turned of Wi-Fi on the new iMac, deleted my network from it's preferred network list, deleted all Airport passwords from my Keychain
I did notice the first time I did this that I had two Airport passwords listed under both Login and System (possibly caused when I first added the new iMac to the network before the successful migration?) but I deleted all of them and when I connected the iMac back to the network I now have one listed under Login and one under System
4. Added a new Network Location
5. Turned off Firewall on the router
6. Turned off Firewall on the iMac
7. I tried to use a Manual IP address but could not get this to work at all. If I used "DHCP with manual IP address” in Network > Advanced > TCP/IP settings and entered the same IP address that was automatically assigned to the iMac, 192.168.2.7, then it wouldn't even connect to the router at all. Setting it back to auto would make things work again but obviously still resulting in the dropped Internet connection.
Have I got a dud iMac, is there something I've missed, something else I can try?

@ Phreak777
You posted on an inactive thread. It's been over 8 months.
Please start a new topic about your issue so it can receive more focused attention.
==========================
When posting in Apple Communties/Forums/Message Boards.......It would help us to know which iMac model you have, which OS & version you're using, how much RAM, etc. You can have this info displayed on the bottom of every post by completing your system profile and filling in the information asked for.
CLICKY CLICK-----> Help us to help you on these forums
***This will help in providing you with the proper and/or correct solutions.***

Can only connect to Internet from one computer at a time on network

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I'd consider that a 3 computer network, Parallels being a virtual machine would alias the ethernet interface and need its own IP address. That may or may not have anything to do with your problem. Actually, the way you've described things, it sounds like a lot has to do with your contract with ATT. Is there a routing device at your end?
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Hi,
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DropBox is another possibility for sharing files and it is free for the first 2GB of storage.
Lou Picinich
Member Apple Developers Network
Certified Member Apple Consultants Network
ACSP 10.5 → 10.7, ACTC 10.5 → 10.7
ACS Security & Mobility 10.6
Mobility Technical Competency
[email protected]
www.SystemXperts.com
(623) 512-8992

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Hello Support Community,
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64 bytes from 10.0.1.5: icmp_seq=181 ttl=64 time=167.427 ms
64 bytes from 10.0.1.5: icmp_seq=182 ttl=64 time=189.954 ms
64 bytes from 10.0.1.5: icmp_seq=183 ttl=64 time=110.766 ms
64 bytes from 10.0.1.5: icmp_seq=184 ttl=64 time=134.041 ms
Request timeout for icmp_seq 185
Request timeout for icmp_seq 186
Request timeout for icmp_seq 187
Request timeout for icmp_seq 188
Request timeout for icmp_seq 189
Request timeout for icmp_seq 190
Request timeout for icmp_seq 191
36 bytes from 10.0.1.1: Redirect Host(New addr: 10.0.1.5)
Vr HL TOS Len   ID Flg off TTL Pro cks      Src      Dst
4 5 00 0054 57b0   0 0000 40 01 0cf3 10.0.1.2 10.0.1.5
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36 bytes from 10.0.1.1: Redirect Host(New addr: 10.0.1.5)
Vr HL TOS Len   ID Flg off TTL Pro cks      Src      Dst
4 5 00 0054 c6b3   0 0000 40 01 9def 10.0.1.2 10.0.1.5
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Your screenshot is blank and even clicking on it just brings up an error.. the site is having issues.. has done so since the latest Apple update.
Same with your Yosemite installed OS. It is bug farm. There are lots of issues and it is hard to get things working in a consistent way on the network.
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http://www6.nohold.net/Cisco2/ukp.aspx?pid=93&login=1&vw=1&app=search&articleid=3760&userrole=Linksy...
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Loosing Internet (only) connectivity on an iMac C2D through ethernet

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