Internet slow down due to my IMac

I have been experiencing major problems with my Internet connection, for a couple of weeks and after long troubleshooting hours I concluded that my IMac is causing the problem. Here is my set up:
Road Runner modem --> Vonage V modem --> Netgear Gigabit Switch ----> Cat6 wiring into my home ---> Dlink Gigabit switch in my home office and Linksys wireless router on the 1st floor ---> Imac, PC and an OKI laser connected to the Dlink in my office, all other computers connected to the system either through the Cat6 wiring or through wireless. Xbox 360, Wii, and a Dlink media streamer connected to the by wire to the Linksys router on the 1st floor
I verified the Road Runner modem by connecting directly to it and the speed is amazing, I disconnected the whole network (Removed netgear switch offline) and connected a computer to the Vonage V-modem through the cable modem, again speed was amazing, I started connecting all the other components one at a time, everything worked fine until my IMac came online speed dropped drastically on the whole network (Including my VOIP phone) I did this 3 times with the same results. I now have my Imac Ethernet port deactivated in order to use the rest of the system.
I did a check through the network utility and found the following:
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 192.168.15.1 UGSc 12 3 en0
127 localhost UCS 0 0 lo0
localhost localhost UH 2 5983 lo0
169.254 link#4 UCS 0 0 en0
172.16.146/24 link#7 UC 2 0 vmnet8
172.16.146.1 0:50:56:c0:0:8 UHLW 0 53 lo0
172.16.146.255 ff:ff:ff:ff:ff:ff UHLWb 2 13 vmnet8
172.16.252/24 link#8 UC 2 0 vmnet1
172.16.252.1 0:50:56:c0:0:1 UHLW 0 314 lo0
172.16.252.255 ff:ff:ff:ff:ff:ff UHLWb 2 13 vmnet1
192.168.15 link#4 UCS 4 0 en0
192.168.15.1 0:23:4d:1:f0:50 UHLW 12 32 en0 1195
192.168.15.2 0:12:17:bb:a1:85 UHLW 0 0 en0 1195
192.168.15.245 localhost UHS 0 0 lo0
192.168.15.250 0:1c:f0:ca:92:44 UHLW 3 96 en0 1197
192.168.15.255 ff:ff:ff:ff:ff:ff UHLWb 2 15 en0
Internet6:
Destination Gateway Flags Netif Expire
localhost link#1 UHL lo0
fd92:2cbe:3cf4:851 link#1 UHL lo0
fe80::%lo0 localhost Uc lo0
localhost link#1 UHL lo0
fe80::%en0 link#4 UC en0
pierres-imac.local 0:1e:c2:6:e:c0 UHL lo0
fe80::%en1 link#6 UC en1
ff01:: localhost U lo0
ff02:: localhost UC lo0
ff02:: link#6 UC en1
192.168.15.245 is my IMac
192.168.15.250 is my Windows Home Server
192.168.15.255 I am not sure
I have no idea what the 169... are or the 172... they are all on my Imac
Any ideas on what I need to do? I am totally stuck.
Pierre
Message was edited by: pwsabm
Message was edited by: pwsabm

The IP starting with 169 is a self-assigned IP on a machine that cannot connect to the network.
http://forums.whirlpool.net.au/forum-replies-archive.cfm/438733.html
It seems you have two routers at work here.
One is assigning IP address of 172. and the other 192.
These are both private IPs assigned by routers.
The 192 is most common
The 172 is less common
Apple uses the 10.
http://www.duxcw.com/faq/network/privip.htm
So first you have to find out why you have two separate DHCP systems:
192 and 172
Then you have to address the issue of why the box with the 169. IP is not getting a connection.
The 192.168.15.255 address is most likely the gateway address of the 192.xxx router

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