Re: [uml-user] bridge/gateway

[David J. <jo...@mc...>]

Goetz,

I actually figured this out earlier today and my problem was that I was 
using the setup for scenario 2 when in fact I should've been using 
scenario 1.  I have my umls using the bridge correctly now.

Thanks,
Dave


On Thu, 4 Sep 2003, Goetz Bock wrote:

> 
> 
> On Wed, Sep 03 '03 at 16:49, David Jones wrote:
> > I thought I'd give bridging a try with uml. [ ... but it does now work
> > ... ]
> Scenario 1:
> 1 host, that has the IP 1.2.3.4 and is the destination for 1.2.4.0/28
>   (e.g. the upstream router knows that all IPs in 1.2.4/28 are
>    reacheable via 1.2.3.4, host uses 1.2.4.14 as gw in 1.2.4.0/28)
>   
> 4 uml hosts: foo, bar, baz, gone
> 
> Setup:
> - on the host:
>     ifconfig eth0 inet 1.2.3.4 netmask $NETMASK broadcast $BROADCAST
>     route add default $GATEWAY
>     brctl addbr br0
>     brctl stp br0 off
>     for i in foo bzr baz gone ; do
>         tunctl -b -u $i -t $i
>         ifconfig $i inet 0.0.0.0 up
>         brctl addif br0 $i
>     done
>     ifconfig br0 inet 1.2.4.14 netmask 255.255.255.240 broadcast 1.2.4.15
> - on each uml:
>     (boot e.g. foo with ... eth0=tuntap,foo,fe:fd:01:02:04:01 ...)
>     ifconfig eth0 inet 1.2.4.1 netmask 255.255.255.240 broadcast 1.2.4.15
>     route add default gw 1.2.4.14
>     (repeat for bar, baz and gone, with different IP)
> 
> After the bridge has learned where the MACs are you sould be able to
> ping as you like. the rest of the network will work too.
> 
> Note:
> - the bridge needs a different mac for each interface, so boot the uml
>   with a MAC. The range: fe:fd:$a:$b:$c:$d is reserved for "private"
>   use. Generaly $a:$b:$c:$d is the hexadecimal version of the four IP
>   address parts.
> - $NETMASK, $BROADCAST, $GATEWAY are the same values you use to connect
>   the normal host
> 
> Scenario 2:
> 1 host, it has an Ip 1.2.3.4, and the UML hosts should have an IP in the
>   same network (e.g. 1.2.3.5 - 1.2.3.8)
> 
> 3 uml hosts: foo, bar, baz, gone
> 
> Setup:
> - on the host
>     brctl addbr br0
>     brctl stp br0 off
>     ifconfig eth0 inet 0.0.0.0 up
>     for i in foo bzr baz gone ; do
>         tunctl -b -u $i -t $i
>         ifconfig $i inet 0.0.0.0 up
>         brctl addif br0 $i
>     done
>     ifconfig br0 inet 1.2.3.4 netmask $NETMASK broadcast $BROADCAST
>     route add default $GATEWAY
> - on each uml:
>     (boot e.g. foo with ... eth0=tuntap,foo,fe:fd:01:02:03:05 ...)
>     ifconfig eth0 inet 1.2.3.5 netmask $NETMASK broadcast $BROADCAST
>     route add default $GATEWAY
>     (repeat for bar, baz and gone, with different IP)
> 
> Now it should all work.
> 
> Note:
> - see above
> - if you don't configure the br0 on the host to have an ip, you can
>   create an invisible bridge.
> - the bridge must be up to work. so either
>     ifconfig br0 inet 0.0.0.0 up
>   or just use the correct ip as done above.
> 
> 
> BTW: all written from memory. I've "powerfull" shellscripts to do all
>      the leg work. And they "just work".
> 
> BTW2: IF anyone can tell me a good, simple, working text2html converter
>       that takes a wiki like syntax, I'll evantauly make a webpage for
>       it. (no Et/Text is not sufficient)
> -- 
> /"\ Goetz Bock at blacknet dot de  --  secure mobile Linux everNETting
> \ /                     (c) 2003 as GNU FDL 1.1
>  X   [ 1. Use descriptive subjects - 2. Edit a reply for brevity -  ]
> / \  [ 3. Reply to the list - 4. Read the archive *before* you post ]
> 
> 
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