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List:       user-mode-linux-user
Subject:    RE: [uml-user] UML Bridging and subnets
From:       "Brock, Anthony - NET" <Anthony.Brock () oregonstate ! edu>
Date:       2005-12-12 22:19:21
Message-ID: 7B4268E5ACB878429B58D4BE5B780E8336FC0E () NWS-EXCH2 ! nws ! oregonstate ! edu
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Sorry, I sent the wrong bridging interface. Here is the output from my
"public" bridge:

~# brctl show
bridge name     bridge id               STP enabled     interfaces
br2             8000.00e0815a0ebc       no              apache-prod
                                                        eth0
                                                        mail-prod
~# 

Tony


> -----Original Message-----
> From: user-mode-linux-user-admin@lists.sourceforge.net 
> [mailto:user-mode-linux-user-admin@lists.sourceforge.net] On 
> Behalf Of Brock, Anthony - NET
> Sent: Monday, December 12, 2005 2:13 PM
> To: user-mode-linux-user@lists.sourceforge.net
> Subject: RE: [uml-user] UML Bridging and subnets
> 
> Are you setup to forward IP packets on the host? Something like:
> 
> ~$ cat /proc/sys/net/ipv4/conf/all/forwarding
> 1
> ~$ 
> 
> This assumes that you're using your host as a gateway. 
> Alternatively, is
> br0 connected to a physical device? For example:
> 
> ~# brctl show
> bridge name     bridge id               STP enabled     interfaces
> br0             8000.00e0815a0eba       no              apache-test
>                                                         mail
> ~# 
> 
> In this case, I don't need (or want) the 'forwarding' flag. 
> The bridging
> interface will automatically forward packets out eth0.
> 
> Tony
> 
> 
> > -----Original Message-----
> > From: user-mode-linux-user-admin@lists.sourceforge.net 
> > [mailto:user-mode-linux-user-admin@lists.sourceforge.net] On 
> > Behalf Of dfleming@swings.2y.net
> > Sent: Monday, December 12, 2005 1:25 PM
> > To: user-mode-linux-user@lists.sourceforge.net
> > Subject: [uml-user] UML Bridging and subnets
> > 
> > Hello,
> > 
> > I'm usually pretty good at finding answers on my own, but 
> > I've only been
> > able to find information in regard to private UML networks 
> > and NAT etc.
> > 
> > I have some UMLs that are unable to access the network beyond 
> > the host.
> > Here is the scenario:
> > 
> > (Sorry about the "999", I'm using routable IPs)
> > 
> > Host IP (br0): 999.999.165.229
> > UML IP (tap1): 999.999.165.231
> > UML IP (tap2): 999.999.160.52
> > 
> > Now the first UML instance, tap1 165.231, can get to the 
> > network beyond
> > the host, but the second cannot.
> > 
> > While searching the net for my answer, I did find some info 
> > that seemed
> > to imply I must alias a similar IP to the bridge so I did, 
> Host br0:1
> > 999.999.160.49.  Now the host and the second UML can reach 
> each other,
> > but it still can't get beyond the host.
> > 
> > Must the host be setup as a gateway?  Do I need to use iptables etc?
> > 
> > Thank-you,
> > 
> > ---Dan 
> > 
> > 
> > 
> > 
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> 
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