Page 1 of 1
Can't ping without gateway
Posted: 30. Mar 2011, 15:34
by smarks
I'll make it short
Host: Windows Server 2008 R2
IP: 192.168.1.2/24
VB Version: 3.2.12
Guest: Windows Server 2008 R2
IP: 192.168.1.3/24
Virtual Networking Type: Bridged networking to my physical NIC.
The problem is unless I configure a gateway 192.168.1.1(set to my dsl router) in both host and guest NIC I am unable to ping between them. I thought gateway is optional for communication in a same subnet. Is there any alternate setup I could use without using gateways?
Thanks in advance.
Re: Can't ping without gateway
Posted: 30. Mar 2011, 15:38
by vbox4me2
Both gw set to blank, what does a route print and a tracert say?
Re: Can't ping without gateway
Posted: 31. Mar 2011, 09:41
by smarks
Tracerts to either OS timeout from the very first hop. Here are the results from route print
Host:
Code: Select all
===========================================================================
Interface List
11...e1 ca 7c 53 d1 2d ......NVIDIA nForce Networking Controller
1...........................Software Loopback Interface 1
13...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
16...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #3
===========================================================================
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
192.168.1.0 255.255.255.0 On-link 192.168.1.2 276
192.168.1.2 255.255.255.255 On-link 192.168.1.2 276
192.168.1.255 255.255.255.255 On-link 192.168.1.2 276
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 192.168.1.2 276
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 192.168.1.2 276
===========================================================================
Persistent Routes:
None
IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
1 306 ::1/128 On-link
1 306 ff00::/8 On-link
===========================================================================
Persistent Routes:
None
Guest:
Code: Select all
===========================================================================
Interface List
11...08 00 27 8b 1b 02 ......Intel(R) PRO/1000 MT Desktop Adapter
1...........................Software Loopback Interface 1
12...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter
13...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
===========================================================================
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
192.168.1.0 255.255.255.0 On-link 192.168.1.3 266
192.168.1.3 255.255.255.255 On-link 192.168.1.3 266
192.168.1.255 255.255.255.255 On-link 192.168.1.3 266
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 192.168.1.3 266
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 192.168.1.3 266
===========================================================================
Persistent Routes:
None
IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
1 306 ::1/128 On-link
1 306 ff00::/8 On-link
===========================================================================
Persistent Routes:
If Metric Network Destination Gateway
0 4294967295 ::/0 fd00::1
===========================================================================
Btw my host CAN ping guest even if a
gateway was not configured on itself but as soon as I clear the
gateway entry in guest the ping breaks. Same way the other way around. It looks like in-order to ping the remote OS the
gateway must be configured on the other side even if they are on the same subnet.
Re: Can't ping without gateway
Posted: 31. Mar 2011, 11:39
by vbox4me2
Re: Can't ping without gateway
Posted: 31. Mar 2011, 11:47
by smarks
Thanks for the reply but that didn't answer my question
. My question is not to setup communication between different subnets. My host and guest is running in a 192.168.1.0 network and I don't seem understand why I should supply
gateway/default_gw for communication to take place. I want the ping to work by supplying just only two fields, IP and Mask. I was wondering if this is an issue with bridged networking in virtualbox.
Re: Can't ping without gateway
Posted: 31. Mar 2011, 20:30
by Sasquatch
The problem what's going on, is that with Windows 2008 and above, the firewall blocks ICMP echo (aka ping) when the network is unknown or public. This happens when there is no gateway set, the network is unknown. Once you enter a gateway, the network suddenly becomes a known network and will be configured for home or office firewall rules. These rules allow ICMP echo requests.
Re: Can't ping without gateway
Posted: 1. Apr 2011, 06:36
by smarks
Spot on Sasquatch. Its switching my firewall profile to public the moment I clear the default
gateway. Can't believe I missed that.
Thanks a lot
