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Old 11-14-2009, 09:19 AM   #1
billyjones26@gmail.com
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Registered: Apr 2009
Posts: 4
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Unhappy VM unable to access internet. Net config help

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Hi folks,

This is a little bit of virtualization and networing.

I have ubuntu os running user-mode linux which runs a ubuntu os as a guest. Something has happened to my network config as i can no longer access anything past the gateway

My setup uses a tap interface on the host. Here are the details:

eth0 (host)

ip address: 192.168.1.8
netmast: 255.255.255.0
Bcast: 192.168.1.255
Default route: 192.168.1.1


tap2 (host)

ip address 192.168.1.5
mask: 255.255.255.255
Bcast: 192.168.1.255

eth0 (guest vm)

ip address: 192.168.1.6
netmast: 255.255.255.0
gateway: 192.168.1.1
bcast: 192.168.1.255
network: 192.168.1.0

Have i configured the guest wrongly? should the gw be the tap interface ip?

I can ping the hosts interface and the gateway at 192.168.1.1 but i cannot get any further than that


Any help most appreciated!

/Jonesy
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Old 11-14-2009, 03:12 PM   #2
manwichmakesameal
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Registered: Aug 2006
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Can you ping external ip's? e.g. 208.67.220.220. If so, then it sounds like a dns issue on the guest machine. Also, try not using an ip on the tap adapter. Mine are set up like this:
Code:
br0       Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet6 addr: fe80::204:4bff:fe16:469c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1345913 errors:0 dropped:0 overruns:0 frame:0
          TX packets:456618 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1201449794 (1.1 GiB)  TX bytes:30545689 (29.1 MiB)

eth0      Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet addr:192.168.2.3  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::204:4bff:fe16:469d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1019203 errors:0 dropped:0 overruns:0 frame:0
          TX packets:585525 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:956767713 (912.4 MiB)  TX bytes:2045010745 (1.9 GiB)
          Interrupt:27 Base address:0xe000

eth1      Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet6 addr: fe80::204:4bff:fe16:469c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2152730 errors:0 dropped:0 overruns:0 frame:0
          TX packets:533592 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2554212079 (2.3 GiB)  TX bytes:43580508 (41.5 MiB)
          Interrupt:28 Base address:0xe000
Notice I don't have an ip on my br0 adapter or my eth1. I have my network set up with static ip's, so I assign it in the guest os.
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Old 11-15-2009, 10:45 AM   #3
billyjones26@gmail.com
LQ Newbie
 
Registered: Apr 2009
Posts: 4
Thanked: 0

Original Poster
Quote:
Originally Posted by manwichmakesameal View Post
Can you ping external ip's? e.g. 208.67.220.220. If so, then it sounds like a dns issue on the guest machine. Also, try not using an ip on the tap adapter. Mine are set up like this:
Code:
br0       Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet6 addr: fe80::204:4bff:fe16:469c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1345913 errors:0 dropped:0 overruns:0 frame:0
          TX packets:456618 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1201449794 (1.1 GiB)  TX bytes:30545689 (29.1 MiB)

eth0      Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet addr:192.168.2.3  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::204:4bff:fe16:469d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1019203 errors:0 dropped:0 overruns:0 frame:0
          TX packets:585525 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:956767713 (912.4 MiB)  TX bytes:2045010745 (1.9 GiB)
          Interrupt:27 Base address:0xe000

eth1      Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet6 addr: fe80::204:4bff:fe16:469c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2152730 errors:0 dropped:0 overruns:0 frame:0
          TX packets:533592 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2554212079 (2.3 GiB)  TX bytes:43580508 (41.5 MiB)
          Interrupt:28 Base address:0xe000
Notice I don't have an ip on my br0 adapter or my eth1. I have my network set up with static ip's, so I assign it in the guest os.

Hi thanks for your reply,

I can ping external IP's so yes it seems to be a DNS issue. I thought the gateway would handle DNS? Any suggestions to fix this?

Rgrds,

Billy
macos billyjones26@gmail.com is offline     Reply With Quote
Old 11-15-2009, 10:54 AM   #4
billyjones26@gmail.com
LQ Newbie
 
Registered: Apr 2009
Posts: 4
Thanked: 0

Original Poster
Thumbs up BOOM!
Quote:
Originally Posted by manwichmakesameal View Post
Can you ping external ip's? e.g. 208.67.220.220. If so, then it sounds like a dns issue on the guest machine. Also, try not using an ip on the tap adapter. Mine are set up like this:
Code:
br0       Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet6 addr: fe80::204:4bff:fe16:469c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1345913 errors:0 dropped:0 overruns:0 frame:0
          TX packets:456618 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1201449794 (1.1 GiB)  TX bytes:30545689 (29.1 MiB)

eth0      Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet addr:192.168.2.3  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::204:4bff:fe16:469d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1019203 errors:0 dropped:0 overruns:0 frame:0
          TX packets:585525 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:956767713 (912.4 MiB)  TX bytes:2045010745 (1.9 GiB)
          Interrupt:27 Base address:0xe000

eth1      Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet6 addr: fe80::204:4bff:fe16:469c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2152730 errors:0 dropped:0 overruns:0 frame:0
          TX packets:533592 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2554212079 (2.3 GiB)  TX bytes:43580508 (41.5 MiB)
          Interrupt:28 Base address:0xe000
Notice I don't have an ip on my br0 adapter or my eth1. I have my network set up with static ip's, so I assign it in the guest os.


Hi again!

Thanks for hinting at a DNS issue. I looked at resolved.conf and notices the nameserver was on the wrong subnet.

Its all fixed now

Thanks again!

Rgrds,

/Jonesy
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