Strange problem with network when vmware process is working

froff · 11-06-2009, 04:56 AM

Hello
I have strange problem with network connection.
When vmware is not started (I mean vmware process, not running guest) network works normal. It is WiFi on DWL-122 USB HUB.
Also under MS Windows it works without problems.

When vmware is started (via rcX.d on startup) computer normally connects to router, obtains IP by DHCP, and shows notification, that is connected (in tray). But communication does not work

Even ping by ip to router. Nothing!
To solve this problem I have to unplug WiFi hub from USB and plug it again. Computers connects again and everything works.

But when I start vmware guest (with NAT mechanizm for network) network stops to work under host, but sill works on guest.
When I stop guest network never works on host again. Even I kill vmware processes, replug USB hub, no way. I have to restart computer to make it working again.

I'm near desperate.

route command says:

Code:

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.128.0   *               255.255.255.0   U     0      0        0 vmnet1
192.168.0.0     *               255.255.255.0   U     2      0        0 wlan0
172.16.199.0    *               255.255.255.0   U     0      0        0 vmnet8
link-local      *               255.255.0.0     U     1000   0        0 wlan0
default         192.168.0.1     0.0.0.0         UG    0      0        0 wlan0

It is interesting that the last line appears 20 seconds after starting route. I have no idea what does mean that long delay.
"link-local" is ip 196.254.0.0

I can't see any conflict

192.168.0.1 is proper router address.
IP from DHCP is 192.168.0.169

Can anybody help?
I'm not a linux nor network expert

P.S.
System: Ubuntu 8.10

P.S.2
dmesg tail:

Code:

[  134.509825] bridge-wlan0: is a Wireless Adapter
[  134.509830] bridge-wlan0: up
[  134.509833] bridge-wlan0: attached
[  138.924264] NET: Registered protocol family 10
[  138.926732] lo: Disabled Privacy Extensions
[  138.927740] ADDRCONF(NETDEV_UP): eth0: link is not ready
[  149.080073] vmnet1: no IPv6 routers present
[  149.372050] wlan0: no IPv6 routers present
[  149.436030] vmnet8: no IPv6 routers present
[  196.576531] type=1503 audit(1255378113.053:6): operation="inode_permission" requested_mask="w::" denied_mask="w::" fsuid=0 name="/dev/ttyUSB0" pid=6748 profile="/usr/sbin/cupsd"

luck.anshu · 11-06-2009, 11:37 AM

I want to know following things:

1. Which interface you for using? (vmnet1/vmnet2...)
2. What's the IP address (with subnet mask) of that interface on your host machine.

froff · 11-06-2009, 04:58 PM

Quote:

Originally Posted by luck.anshu

I want to know following things:

1. Which interface you for using? (vmnet1/vmnet2...)
2. What's the IP address (with subnet mask) of that interface on your host machine.

Hi
thank's for response

vmnet1 and vmnet8 (not 2) are interfaces "established" by vmware, I do not exactly know what is their role.
I use wlan0 intreface to connect network.

My IP form DHCP is 192.168.0.169, my router (also DHCP serwer) is at 192.168.0.1; subnet mask: 255.255.255.0

route and ifconfig give the same result before and after replugging usb hub.

traceroute to router 192.168.0.1 gives result:

Code:

traceroute to 192.168.0.1 (192.168.0.1), 30 hops max, 40 byte packets
 1  hebel.local (192.168.0.169)  3002.583 ms !H  3002.586 ms !H *

very very long times!!!

and after replugging hub:

Code:

 1  192.168.0.1 (192.168.0.1)  1.654 ms  2.085 ms  3.185 ms

luck.anshu · 11-07-2009, 09:14 AM

1st of all check whether vmnet1 and vmnet is configured in same subnet or not, it can conflict your IP address, which you are getting from dhcp server.
If you don't want connectivity for your guest vmware machine then down vmnet1 and vmnet2.
These 2 interface are provided during installation if you want to connect your machine with your host.

If you want to connect guest with your host then bind vmnet1 on your vmware and then configure IP address in my guest machine which should be configured in same subnet of vmnet1
Now create following firewall rules to access host machine and internet

iptables -I INPUT -s <ip address of guest machine> -j ACCEPT
iptables -I POSTROUTING -s <ip address of guest machine> -j MASQUERADE

froff · 11-07-2009, 03:33 PM

As we can see in route result there is no subnets conflict. Or maybe I do not understand its output

Is it any way to check why traceroute shows those very long times when connecting to router?
Now I think that network theoretically works but something makes this long delay for every packet so each communication ends on timeout. I have no idea how to investigate what makes this delay and why.