I have 2 computers running Ubuntu 12.04 connected to a router on the 192.168.3 subnet. This router is connected to another router via the first router's modem port, so the 192.168.3 router has access to the 192.168.2 subnet. The .2 router is connected to the internet. I will call the 2 computers A and B. Computer A can ping itself, computer B, the .3 and .2 routers, and www.google.com. Computer B can ping itself, computer A, the .3 and .2 routers, but CAN NOT ping www.google.com. I essentially have no internet on computer B.
~$ ping www.google.com
ping: unknown host www.google.com
Output from ifconfig: Computer A
eth0 Link encap:Ethernet HWaddr 00:05:b7:dd:87:63
inet addr:192.168.3.135 Bcast:192.168.3.255 Mask:255.255.255.0
inet6 addr: fe80::205:b7ff:fedd:8763/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3940 errors:0 dropped:0 overruns:0 frame:0
TX packets:2216 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3365434 (3.3 MB) TX bytes:262362 (262.3 KB)
Interrupt:20 Memory:f7c00000-f7c20000
eth1 Link encap:Ethernet HWaddr 00:05:b7:dd:87:64
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:17 Memory:f7940000-f7960000
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:16436 Metric:1
RX packets:426 errors:0 dropped:0 overruns:0 frame:0
TX packets:426 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:35063 (35.0 KB) TX bytes:35063 (35.0 KB)
Output from ifconfig: Computer B
eth0 Link encap:Ethernet HWaddr 00:05:b7:dd:87:43
inet addr:192.168.3.136 Bcast:192.168.3.255 Mask:255.255.255.0
inet6 addr: fe80::205:b7ff:fedd:8743/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:737 errors:0 dropped:0 overruns:0 frame:0
TX packets:551 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:73299 (73.2 KB) TX bytes:97661 (97.6 KB)
Interrupt:20 Memory:f7e00000-f7e20000
eth1 Link encap:Ethernet HWaddr 00:05:b7:dd:87:44
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:17 Memory:f7d40000-f7d60000
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:336 errors:0 dropped:0 overruns:0 frame:0
TX packets:336 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:20796 (20.7 KB) TX bytes:20796 (20.7 KB)
Output from route: Computer A
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.3.1 0.0.0.0 UG 0 0 0 eth0
link-local * 255.255.0.0 U 1000 0 0 eth0
192.168.3.0 * 255.255.255.0 U 1 0 0 eth0
Output from route: Computer B
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.3.1 0.0.0.0 UG 0 0 0 eth0
link-local * 255.255.0.0 U 1000 0 0 eth0
192.168.3.0 * 255.255.255.0 U 1 0 0 eth0
The only difference I can find is in the resolv.conf file
Resolv.conf for Computer A
# 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 ampedwireless
ampedwireless is the domain name for the DHCP server on the .2 router.
Resolv.conf for Computer B
# Generated by NetworkManager
nameserver 127.0.0.1
I believe computer B's resolv.conf used to b an exact copy of computer A's EXCEPT for the last line (search ampedwireless), but I tried to apply someone's recommended fix as follows:
sudo apt-get remove --purge resolvconf
sudo /etc/init.d/networking restart
and this fix I believe removed the comment, but not my problem. When I try to manually add "search ampedwireless" to computer B's resolv.conf, it gets overwritten.
I've tried to search google, but unfortunately everything I've seen has a slightly different problem and the fix doesn't help. I think trying to follow that one page's advice has actually set me backwards by removing resolvconf, which I can no longer install because I don't have internet access. Please let me know if any additional information will help. Thanks in advance.
Edit to add info requested by Mark: nm-tool on Computer A
~$ nm-tool
** (process:3218): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: Rejected send message, 2 matched rules; type="method_call", sender=":1.45" (uid=1000 pid=3218 comm="nm-tool ") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination="org.freedesktop.NetworkManager" (uid=0 pid=912 comm="NetworkManager ")
NetworkManager Tool
State: unknown
** (process:3218): WARNING **: error: could not connect to NetworkManager
nm-tool on Computer B (they look the same to me):
~$ nm-tool
** (process:1965): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: Rejected send message, 2 matched rules; type="method_call", sender=":1.40" (uid=1000 pid=1965 comm="nm-tool ") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination="org.freedesktop.NetworkManager" (uid=0 pid=909 comm="NetworkManager ")
NetworkManager Tool
State: unknown
** (process:1965): WARNING **: error: could not connect to NetworkManager
dig on Computer A:
~$ dig @8.8.8.8 google.com
; <<>> DiG 9.8.1-P1 <<>> @8.8.8.8 google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46307
;; flags: qr rd ra; QUERY: 1, ANSWER: 11, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;google.com. IN A
;; ANSWER SECTION:
google.com. 299 IN A 173.194.46.66
google.com. 299 IN A 173.194.46.69
google.com. 299 IN A 173.194.46.70
google.com. 299 IN A 173.194.46.68
google.com. 299 IN A 173.194.46.64
google.com. 299 IN A 173.194.46.65
google.com. 299 IN A 173.194.46.78
google.com. 299 IN A 173.194.46.73
google.com. 299 IN A 173.194.46.72
google.com. 299 IN A 173.194.46.71
google.com. 299 IN A 173.194.46.67
;; Query time: 40 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu May 22 12:00:58 2014
;; MSG SIZE rcvd: 204
dig on Computer B:
~$ dig @8.8.8.8 google.com
; <<>> DiG 9.8.1-P1 <<>> @8.8.8.8 google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16939
;; flags: qr rd ra; QUERY: 1, ANSWER: 11, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;google.com. IN A
;; ANSWER SECTION:
google.com. 41 IN A 74.125.225.110
google.com. 41 IN A 74.125.225.102
google.com. 41 IN A 74.125.225.96
google.com. 41 IN A 74.125.225.99
google.com. 41 IN A 74.125.225.104
google.com. 41 IN A 74.125.225.98
google.com. 41 IN A 74.125.225.101
google.com. 41 IN A 74.125.225.105
google.com. 41 IN A 74.125.225.100
google.com. 41 IN A 74.125.225.103
google.com. 41 IN A 74.125.225.97
;; Query time: 39 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu May 22 12:00:37 2014
;; MSG SIZE rcvd: 204