29 Jun
2008
29 Jun
'08
9:14 a.m.
Hi,
I am trying to setup network to access the guest running on
VirtualBox from internet. My current setup is as follows :-
eth1 - Internet
eth0 - LAN
I set up network to work properly on VirtualBox following the how-to on
gentoo-wiki[1] and was able to access the guest from outside. But, since
eth0 is bridged to br0, the other PC on the LAN isn't able to access the
internet. I don't have any more network cards. What would be the best
way to tackle this? Should I create eth1:0? Any other solutions?
[1] http://www.gentoo-wiki.com/HOWTO_VirtualBox
--
I thrive on change... I thrive on making other people change.
-- Calvin
29 Jun
29 Jun
5:37 p.m.
Mehul Ved wrote:
Hi,
I am trying to setup network to access the guest running on
VirtualBox from internet. My current setup is as follows :-
eth1 - Internet
eth0 - LAN
I set up network to work properly on VirtualBox following the how-to on
gentoo-wiki[1] and was able to access the guest from outside. But, since
eth0 is bridged to br0, the other PC on the LAN isn't able to access the
internet. I don't have any more network cards. What would be the best
way to tackle this? Should I create eth1:0? Any other solutions?
[1] http://www.gentoo-wiki.com/HOWTO_VirtualBox
Which is the other PC on the LAN? Are you referring to the host OS? If
your guest OS can access the net, your host using br0 will also do it as
br0 is the common passage.
BTW, how did you link eth1 for Internet Connection Sharing? I have
always wondered how ICS is done in GNU/Linux.
--
Regards,
Rony.
GNU/Linux !
No Viruses
No Spyware
Only Freedom.
7:33 p.m.
On Sun Jun 29, 2008 at 11:07:16PM +0530, Rony wrote:
Which is the other PC on the LAN?
Other PC is my sister's PC, which receives internet connection through
my PC.
----->Cable Modem--->My Pc(eth1)--->My PC(eth0) ---->Sister's PC
Are you referring to the host OS?
Host OS is sabayon and guest OS is Arch, running within VirtualBox on
Sabayon.
BTW, how did you link eth1 for Internet Connection
Sharing? I have
always wondered how ICS is done in GNU/Linux.
1) Set up my static IP on eth1
2) Gave an IP of 192.168.0.1 to eth0 and 192.168.0.2 to the PC on the LAN.
3) Made sure that the PC's on the LAN ping each other.
4) Set up Masqueading with IP Tables
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j MASQUERADE
I believe this can be done by GUI tools too but never looked into them.
5) Enable ip forwarding
echo "1" > /proc/sys/net/ipv4/ip_forward
This will allow packets to pass b/w interfaces.
--
"All this modern technology just makes people try to do everything at once."
-Hobbes
30 Jun
30 Jun
11:59 a.m.
Mehul Ved wrote:
Wow I didn't know it was that simple, only one line. Since the internet
device and the LAN device is not mentioned in your command line, does
the system assume internet device as the one which has default route and
the LAN is the one that matches subnet?
On Sun Jun 29, 2008 at 11:07:16PM +0530, Rony wrote:
So now br0 is your interface that will talk to your LAN pcs. Are br0 and
your LAN pcs on the same subnet?
Which is the other PC on the LAN?
Other PC is my sister's PC, which receives internet connection through
my PC.
----->Cable Modem--->My Pc(eth1)--->My PC(eth0) ---->Sister's PC
Are you referring to the host OS?
Host OS is sabayon and guest OS is Arch, running within VirtualBox on
Sabayon.
BTW, how did you link eth1 for Internet
Connection Sharing? I have
always wondered how ICS is done in GNU/Linux.
1) Set up my static IP on eth1
2) Gave an IP of 192.168.0.1 to eth0 and 192.168.0.2 to the PC on the LAN.
3) Made sure that the PC's on the LAN ping each other.
4) Set up Masqueading with IP Tables
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j MASQUERADE
I believe this can be done by GUI tools too but never looked into them.
5) Enable ip forwarding
echo "1" > /proc/sys/net/ipv4/ip_forward
This will allow packets to pass b/w interfaces.
Just curious to know, after IP forwarding eth1 (internet) does your host
OS have access to the net?
--
Regards,
Rony.
GNU/Linux !
No Viruses
No Spyware
Only Freedom.
12:50 p.m.
On Mon Jun 30, 2008 at 05:29:58PM +0530, Rony wrote:
You need not mention the device cos NAT handles all the request
originating from 192.168.0.0/24 and Masquerade's them. Iptables will
take care of the NAT tables. So, no need to specify interfaces.
Yes, after the above steps, both the PC's are online. Only the requests
originating from 192.168.0.0/24(in this case) are forwarded, not the
others.
But, this method has a drawback that the PC doing the forwarding needs to
stay online when other PC's need to go online. So, this isn't the ideal
setup in most cases but it will work fine in my case since my PC is on
24/7.
--
"All this modern technology just makes people try to do everything at once."
-Hobbes
iptables -t
nat -A POSTROUTING -s 192.168.0.0/24 -j MASQUERADE
I believe this can be done by GUI tools too but never looked into them.
Wow I didn't know it was that simple, only one line. Since the internet
device and the LAN device is not mentioned in your command line, does
the system assume internet device as the one which has default route and
the LAN is the one that matches subnet? 5) Enable ip
forwarding
echo "1" > /proc/sys/net/ipv4/ip_forward
This will allow packets to pass b/w interfaces.
Just curious to know, after IP forwarding eth1 (internet) does your host
OS have access to the net?
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Mehul Ved -
Rony