Re: [vserver] Question on the FAQ

From: Herbert Poetzl <herbert_at_13thfloor.at>
Date: Tue 18 Dec 2007 - 22:47:14 GMT
Message-ID: <20071218224714.GA18874@MAIL.13thfloor.at>

On Tue, Dec 18, 2007 at 11:56:10AM -0800, Ng, Cheon-woei wrote:
> Hi All,
>
> This is my first time visiting the vserver site. Upon reading the FAQ,
> I came across this question:
>
> http://linux-vserver.org/Frequently_Asked_Questions#Trying_to_connect_to
> _a_vserver_from_the_host_or_another_vserver_on_the_same_host_fails
>
>
>
> Below is the copy of the question and answer:
>
>
> Trying to connect to a vserver from the host or another vserver on the
> same host fails
>
>
> strace shows
>
>
> sin_addr=inet_addr("xx.xx.xx.xx")}, yy) = -1 EINVAL (Invalid argument)
>
> A: The host/guest cannot communicate with another guest on same host.
>
> * check all netmasks on all interfaces (do they overlap) ?
> * check policy routing (disable it temporary) ?
> * check that lo is up (Networking within a host/guest always
> uses lo interface)
>
> The answer has this line:
>
> The host/guest cannot communicate with another guest on same host
>
> Is this answer just a rephrasing of the question?

I would say, the person adding this FAQ, did mess up the
formatting a little, and this is the question/observation
while the points above might be good reasons ...

personally I'm missing firewalling there, because my best
bet would be too restrictive iptables rule

> Or is this a true vserver's limitation?

no, there is no such limitation. Linux-VServer networking
happens on the host, so that would be equivalent to saying
a Linux box cannot connect with itself (via IP)

> Thank you!

HTC,
Herbert

> Sincerely,
>
> Woei Ng
>
>
>
>
>
Received on Tue Dec 18 22:47:29 2007

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