Re: [Vserver] Re: About the tcp/ip stack ...

From: Avery Pennarun <>
Date: Fri 26 May 2006 - 15:08:26 BST
Message-ID: <>

On Fri, May 26, 2006 at 06:18:39AM -0400, Andrew Schulman wrote:

> > "I don`t try this but it`s can be don`t work with FreeVPS.
> > dhcpd use bpf for get requests, but bpf level very poor virtualizated at
> > FreeVPS.
> > I have plan to rewrite vnetdev module for use L2 address for separate
> > packets between contexts and ability use any vps as default gateway for
> > all other, but it`s not for 1.5 branch.
> > At current time separate packets between contexts work with L3 addresses
> > (IPv4/v6)."
> Sorry if this is OT for this list, but let me see if I understand: are you
> saying that FreeVPS' virtual network interfaces isolate TCP traffic, but not
> UDP? And therefore dhcpd won't run in a FreeVPS VPS? Can this really be
> true? I can't find any other mention of it, and
> says that FreeVPS has "private udp
> socket lists".
> If this is true it's very bad for FreeVPS.

Although dhcp packets use UDP, they're very weird UDP packets because the
client doesn't necessarily have an IP address at the time it needs to
receive them. Thus, dhcpd uses a different socket layer than normal
UDP/TCP, which I gather from the above is not divided between contexts in

Almost nothing uses that socket layer except things like tcpdump, dhcpd,
some intrusion detection systems, and so on.

Have fun,

Vserver mailing list
Received on Fri May 26 15:09:20 2006

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