Insane issue with ethernet hub

I am back again. Today, I set up a 3 computer Ethernet hub. 2 of the computers run Linux and the other computer runs Windows 8.1. The problem: Whenever the Ethernet hub is running, the rest of the computers (on Wifi) cannot access the internet. Can anybody tell me why this is happening and how to fix it? Thanks for your advice!
 
Is this simple hub, or a switch, or a router?
There is a chance when you turn your hub on, the ethernet connections on your computers get live, and reroute their default gateway thru ethernet instead of WiFi. So, please post for every PC (when you turn the hob ON) results from:
- for Windwos PC:
Code:
ipconfig /all
route print

for Linux PCs:
Code:
ifconfig
cat /etc/resolv.conf
route -n
 

My Windows compter gives off this:

Microsoft Windows [Version 6.3.9600]
(c) 2013 Microsoft Corporation. All rights reserved.

C:\Users\The Computer Geek>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : ComputerGeek-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : home

Ethernet adapter Network Bridge:

Connection-specific DNS Suffix . : lan
Description . . . . . . . . . . . : Microsoft Network Adapter Multiplexor Dri
ver
Physical Address. . . . . . . . . : 40-16-7E-06-2C-B6
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2600:100c:b21f:cc0e:68cd:e29b:3c42:ea67(P
referred)
IPv6 Address. . . . . . . . . . . : fd00::68cd:e29b:3c42:ea67(Preferred)
Temporary IPv6 Address. . . . . . : 2600:100c:b21f:cc0e:3505:366:f4b3:f5f7(Pr
eferred)
Temporary IPv6 Address. . . . . . : fd00::3505:366:f4b3:f5f7(Preferred)
Link-local IPv6 Address . . . . . : fe80::68cd:e29b:3c42:ea67%30(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.41(Duplicate)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Monday, June 2, 2014 2:21:57 PM
Lease Expires . . . . . . . . . . : Monday, June 9, 2014 2:21:56 PM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.254
DHCPv6 IAID . . . . . . . . . . . : 876615294
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-DB-F1-2C-40-16-7E-06-2C-B6

DNS Servers . . . . . . . . . . . : 2001:4888:47:ff00:406:d::
2001:4888:41:ff00:404:d::
NetBIOS over Tcpip. . . . . . . . : Enabled
Connection-specific DNS Suffix Search List :
home

Ethernet adapter Bluetooth Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
Physical Address. . . . . . . . . : FC-F8-AE-E5-95-5B
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Local Area Connection* 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter
Physical Address. . . . . . . . . : FC-F8-AE-E5-95-58
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter VirtualBox Host-Only Network:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : VirtualBox Host-Only Ethernet Adapter
Physical Address. . . . . . . . . : 08-00-27-00-E4-6A
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::68e1:a19c:3457:faa1%27(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.56.1(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 487063591
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-DB-F1-2C-40-16-7E-06-2C-B6

DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled

C:\Users\The Computer Geek>route print
===========================================================================
Interface List
30...40 16 7e 06 2c b6 ......Microsoft Network Adapter Multiplexor Driver
7...fc f8 ae e5 95 5b ......Bluetooth Device (Personal Area Network)
5...fc f8 ae e5 95 58 ......Microsoft Wi-Fi Direct Virtual Adapter
27...08 00 27 00 e4 6a ......VirtualBox Host-Only Ethernet Adapter
1...........................Software Loopback Interface 1
===========================================================================

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
192.168.56.0 255.255.255.0 On-link 192.168.56.1 276
192.168.56.1 255.255.255.255 On-link 192.168.56.1 276
192.168.56.255 255.255.255.255 On-link 192.168.56.1 276
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 192.168.56.1 276
224.0.0.0 240.0.0.0 On-link 1e 266
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 192.168.56.1 276
255.255.255.255 255.255.255.255 On-link 1e 266
===========================================================================
Persistent Routes:
None

IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
1 306 ::1/128 On-link
30 266 2600:100c:b21f:cc0e::/64 On-link
30 266 2600:100c:b21f:cc0e:3505:366:f4b3:f5f7/128
On-link
30 266 2600:100c:b21f:cc0e:68cd:e29b:3c42:ea67/128
On-link
30 266 fd00::/64 On-link
30 266 fd00::3505:366:f4b3:f5f7/128
On-link
30 266 fd00::68cd:e29b:3c42:ea67/128
On-link
27 276 fe80::/64 On-link
30 266 fe80::/64 On-link
30 266 fe80::68cd:e29b:3c42:ea67/128
On-link
27 276 fe80::68e1:a19c:3457:faa1/128
On-link
1 306 ff00::/8 On-link
27 276 ff00::/8 On-link
30 266 ff00::/8 On-link
===========================================================================
Persistent Routes:
None

 
My Debian computer gives off this:
donna@debian:~$ ifconfig
bash: ifconfig: command not found
donna@debian:~$ cat /etc/resolv.conf
# Generated by NetworkManager
domain lan
search lan home.
nameserver 2001:4888:47:ff00:406:d::
nameserver 2001:4888:41:ff00:404:d::
donna@debian:~$ route -n
bash: route: command not found
donna@debian:~$
 
My Ubuntu 14.10 computer gives off this:
william@william-G41MT-S2PT:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 90:2b:34:2d:12:42
inet addr:192.168.1.17 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: 2600:100c:b21f:cc0e:922b:34ff:fe2d:1242/64 Scope:Global
inet6 addr: 2600:100c:b21f:cc0e:9c0d:cda1:6c1b:a868/64 Scope:Global
inet6 addr: fd00::9c0d:cda1:6c1b:a868/64 Scope:Global
inet6 addr: fd00::922b:34ff:fe2d:1242/64 Scope:Global
inet6 addr: fe80::922b:34ff:fe2d:1242/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:558360 errors:0 dropped:0 overruns:0 frame:0
TX packets:1959 errors:0 dropped:0 overruns:0 carrier:1
collisions:0 txqueuelen:1000
RX bytes:266308049 (266.3 MB) TX bytes:216364 (216.3 KB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:976 errors:0 dropped:0 overruns:0 frame:0
TX packets:976 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:84386 (84.3 KB) TX bytes:84386 (84.3 KB)

william@william-G41MT-S2PT:~$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
search lan home
william@william-G41MT-S2PT:~$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0
william@william-G41MT-S2PT:~$
 
On first look:
- I don't see WIndows and Ubuntu box to have WiFi connected.
- your Windows box has strange IP config. It's IP address is listed as Duplicate, and there is no default gateway in the routing table. There is also no IPv4 DNS server assigned to that box. Apart from that router, and that switch, do you have any other equipment (e.g. servers, NAS boxes etc)?
- on Debian, it seems that one need "sudo ifconfig" and "sudo route -n" in order to get the IP configuration. There is also no DNS server assigned.
- your Ubuntu box does not have DNS configuration.

So, it seems your problem is in the DNS addresses assigned in your router. How it is configured?
 
I do have a bridged adatper for my XBOX and I also have VirtualBox chewing another virtual port. WiFi is disabled to ensure that the computers run on Ethernet only. My Ubuntu box has no wireless adapter and I do not have anything else connected to the D-Link switch EXCEPT the Verzion Fusion on port 1. My Ubuntu box is on port 2, then the Debian 32-bit computer on port 3 and my Windows 8.1 laptop on port 4. Port 5 is empty.
 
The Verizon Fusion is a modem + a router. It has 4 Ethernet ports on the back. The D-Link DGS-1005G is plugged into one of those ports. The Verizon Fusion is on port 1. My Ubuntu box is on port 2. The Debian 32-bit box is on port 3. My Windows 8.1 box is on port 4. Port 5 is empty. WiFi is disabled to ensure that the computers run on Ethernet only. My Ubuntu 14.04 box has no wireless adapter. I do have a bridged adatper for my XBOX and I also have VirtualBox chewing another virtual port.