From: "John A. Sullivan III" <jsullivan@opensourcedevel.com>
To: rgarrido.l@gmail.com
Cc: netfilter@lists.netfilter.org
Subject: Re: NetBIOS dgm NAT Helper
Date: Fri, 16 Sep 2005 22:21:08 -0400 [thread overview]
Message-ID: <1126923668.6687.25.camel@localhost> (raw)
In-Reply-To: <2b8e1997050916175339d88351@mail.gmail.com>
Thank you but I don't think this helps. It looks like it is for the
name service rather than the datagram service. I would think such a
help would need to rewrite the embedded IP in the NetBIOS header and
recalculate any checksumming - John
On Sat, 2005-09-17 at 02:53 +0200, Rafa Garrido wrote:
> It can that this patch of the last week help you:
> http://patchwork.netfilter.org/netfilter-devel/patch.pl?id=2859
> It will be necessary to hope to that stable kernel appears.
> Greetings.
>
>
> On 9/16/05, John A. Sullivan III <jsullivan@opensourcedevel.com> wrote:
> > We have encountered an unusual situation where NetBIOS datagram packets
> > (138/udp) are being passed through an IPSec tunnel on an iptables
> > firewall but they are also being NATted by the same firewall. It
> > appears there is IP information embedded in the NetBIOS header. Thus
> > NAT causes this protocol to break because the reply packets are sent to
> > the original IP address in the NetBIOS header rather than the NAT IP
> > address in the IP header.
> >
> > I believe Cisco does have a NAT helper for NetBIOS but I have not seen
> > anything for iptables. Is there such a helper? Is there anyway for an
> > iptables firewall to NAT NetBIOS datagram packets? Thanks - John
> > --
> > John A. Sullivan III
> > Open Source Development Corporation
> > +1 207-985-7880
> > jsullivan@opensourcedevel.com
> >
> > If you would like to participate in the development of an open source
> > enterprise class network security management system, please visit
> > http://iscs.sourceforge.net
> >
> >
> >
>
--
John A. Sullivan III
Open Source Development Corporation
+1 207-985-7880
jsullivan@opensourcedevel.com
Financially sustainable open source development
http://www.opensourcedevel.com
next prev parent reply other threads:[~2005-09-17 2:21 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-16 18:38 NetBIOS dgm NAT Helper John A. Sullivan III
2005-09-17 0:53 ` Rafa Garrido
2005-09-17 2:21 ` John A. Sullivan III [this message]
2005-09-17 12:01 ` Rafa Garrido
2005-09-17 16:21 ` John A. Sullivan III
2005-09-17 20:15 ` Rafa Garrido
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