Ubuntu – LAN works but Internet gone after going to static IP

I had a perfectly functioning Ubuntu 12.04 system. I saw a YouTube video from DEFCON where a guy was discussing attacking home routers. In an Internet search of home router security I found a 2011 CERT paper on strengthening SOHO routers. One tip was to reduce the number of IPs on the LAN and to use static IPs.

I went into my 12.04 machine. I set up the static IP address, 192.168.1.7, that I had prepared at the router and lost Internet access. The LAN still works. When I boot to Windows 7, Windows 7 has Internet access. When I go back to DCHP in Ubuntu, reboot, and check I again have LAN access but no Internet access – different IP [192.168.1.11] from DHCP.

I completely reinstalled Ubuntu from a CD – same problem.

I did a search on askubuntu and found 2 previous posts

Wired Internet doesn't work on ubuntu 12.04 from April 29
internet access problem in 12.04 from April 28

I tried those things and they didn't work.

Any ideas, strategies, and tactics for troubleshooting this issue would be much appreciated.

Here are some diagnostics which may be helpful:

ifconfig eth0
eth0      Link encap:Ethernet  HWaddr e0:cb:4e:b1:26:dc  
      inet addr:192.168.1.11  Bcast:192.168.1.255  Mask:255.255.255.0 
      inet6 addr: fe80::e2cb:4eff:feb1:26dc/64 Scope:Link 
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 
      RX packets:1816 errors:0 dropped:0 overruns:0 frame:0 
      TX packets:2168 errors:0 dropped:0 overruns:0 carrier:0 
      collisions:0 txqueuelen:1000 
      RX bytes:162945 (162.9 KB)  TX bytes:162147 (162.1 KB) 
      Interrupt:49 


route
Kernel IP routing table 
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface 
default         192.168.1.1     0.0.0.0         UG    0      0        0 eth0 
link-local      *               255.255.0.0     U     1000   0        0 eth0 
192.168.1.0     *               255.255.255.0   U     1      0        0 eth0

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 127.0.0.1 
search charter.net 

ping -c 4 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. 
--- 8.8.8.8 ping statistics --- 
4 packets transmitted, 0 received, 100% packet loss, time 3024ms 


The output of nm-tool:
NetworkManager Tool 

State: connected (global) 

- Device: eth0  [Wired connection 1] ------------------------------------------- 
  Type:              Wired 
  Driver:            jme 
  State:             connected 
  Default:           yes 
  HW Address:        E0:CB:4E:B1:26:DC 

  Capabilities: 
    Carrier Detect:  yes 
    Speed:           1000 Mb/s 

  Wired Properties 
    Carrier:         on 

  IPv4 Settings: 
    Address:         192.168.1.11 
    Prefix:          24 (255.255.255.0) 
    Gateway:         192.168.1.1 

    DNS:             208.67.222.222 
    DNS:             208.67.220.220 
    DNS:             192.168.1.1 

Results of ping -c 4 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.

— 192.168.1.1 ping statistics —
4 packets transmitted, 0 received, 100% packet loss, time 3024ms

Note: This non-response by the router may be because I have set under Security | Firewall | Attack Check | Respond to Ping on Internet Ports [unchecked]. 192.168.1.1 brings up the router login screen on the laptop running Ubuntu 12.04.

I fixed it. Thank you for your assistance. I really appreciate your input on where to look as I tried to resolve this issue.

I went into the UP|Down arrow Icon on the menu bar. This brings up Network Connections. Under the Wired tab I picked Wired Connection 1 and choose [Edit]. That bring up a new options list with 4 tabs. I choose the 3rd Tab [IPv4 Settings].

Choices
Method:Manual
Addresses [Add] Address:192.168.1.7, Netmask:255.255.255.0 Gateway:192.168.1.1
DSN Servers: 208.67.222.222, 208.67.220.220, 192.168.1.1
Search Domains: charter.net
DHCP Client ID: blank – no entry, no change
Require IPv4 addressing for this connection to complete: unchecked – no entry, no change
Routes – brings up a new options listing [Add] Address:192.168.1.7 Netmask:255.255.255.0 Gateway:192.168.1.1 – I left the 2 check box options blank and clicked OK.
Back one screen "Available to all users" [checked] – no change, no entry
Save
Back one screen to Network Connections | Wired
Close

Please excuse me if this fix explanation is too long or detailed. Having searched this resource for answers to questions in the past I know I appreciated when there was more detail. I am new to this forum and don't want to raise the ire of the Sys Admins, Power Users, and the like.