Re: [Xen-users] DomU bridge network only works in private network

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Jintack Lim <jintack@xxxxxxxxxxxxxxx> wrote:

> However, when I connected to a school router,
> then dom0 gets a public ip address that I can access via ssh from anywhere.
> However domU's network is not working.
> More specifically, "dhclient eth0" never returns.
> I'm using a static ip address for dom0,
> and it is assigned automatically by the router since dom0's MAC
> address is registered.
> 
> Is there anyway that I can get a public ip address for domU without
> using my own router?

Sounds like the school network has some form of access control and your DomU 
isn't registered.

You may have to assign it a static MAC and "sign in" that MAC to the school's 
network system.

Or there may be access controls that limit the MACs allowed on a single switch 
port - in which case you'll be restricted to one "device" with networking 
connected to that port. In that case, you'd need to use NAT (MASQ) to hide all 
nut one device behind one IP & MAC - unless you can get the network admin to 
lift the restriction.

IN any case, depending on the network admins, it may be worth talking to them 
about it. *IF* they are clued up about networking then they may well be able to 
tell you what the problem & solution is. On the other hand, they may know 
nothing about networking (other than how to manage the admin system on it) and 
be completely unable to help. Sadly, I've come across "a few" network admins 
who make me wonder how they got the job (how do you become a network admin if 
you don't even know the basics of IP addressing) :-/


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