Re: Configuring Diald on gateway

[http://dummy.us.eu.org/robert (robert)]

 > From: "zoqix" <http://www.yahoo.com/~zoqix>
 > Date: Tue, 7 Nov 2000 10:12:17 +0800
 >
 > >  > How do I resolve that then? (my client tried to get a
 > >  > dhcp lease or ftp
 > >  > using ip address to my server, my server activate the
 > >  > link)
 > >
 > > OK, then probably something else is wrong.
 > >
 > > 1) Is your Linux host trying to do a reverse-lookups?  The way to see this
 > >    is to run "tcpdump" and look for both TCP & UDP traffic with port 53.
 > 
 > I'm not sure whether it's reverse-lookup but link is activated by UDP
 > traffic with port 53.
 > Activated by the filter udp.dest=udp.domain.
 > By the way, I'm using diald version 0.99-4 but I don't think it makes any
 > difference cos the setup is the same  :)

Try doing "tcpdump eth0 -s 8192 -w - udp port 53 | strings" while you
do the connect.  You should be able to see the address it's trying to look
up.

 > > 2) Are you running IP masquerading?
 > 
 > Yes, I'm running IP masquerading.
 > 
 > >  > Later, if I intend to add in local dns, won't that be
 > >  > even more problematic?
 > >
 > > I run dnrd, Domain Name Relay Daemon, and it works like a charm.  (It's
 > > not a real DNS server, 'though.)
 > 
 > I'm running named

Do you have any forwards in your named.conf?

 > with dhcp-ddns and it keeps activating my link.

Also, how is routing set up?  (Do "route -n".)

Also, where did you get your IP masquerading rules from?  I assume you are
using ipchains.

 > I think it's because it trys to update my local dns with external ones.

Unless you have forwarding set up, I doubt it.

What does your /etc/host.conf look like?

 > Do you know any way to set the refresh mode of this off? This may not solve
 > the whole problem of my diald. But it solve at least one.
 > 
 > >
 > >  > -----Original Message-----
 > >  > From: robert <http://dummy.us.eu.org/robert>
 > >  > To: zoqix <http://www.yahoo.com/~zoqix>
 > >  > Date: Friday, November 03, 2000 10:34 PM
 > >  > Subject: Re: Configuring Diald on gateway
 > >  >
 > >  > > > From: "zoqix" <http://www.yahoo.com/~zoqix>
 > >  > > > Date: Fri, 3 Nov 2000 07:40:35 +0800
 > >  > > >
 > >  > > > Hi Robert,
 > >  > > >
 > >  > > > I know what went wrong now. Becos I cut and paste
 > >  > your standard filter
 > >  > from
 > >  > > > WinWord and therefore it end up as an invalid file
 > >  > for Linux.
 > >  > > > I've solved that and tried out your
 > >  > standard.filter on my system.
 > >  > However,
 > >  > > > there's still the same problem. When my client
 > >  > tried to get a dhcp lease
 > >  > or
 > >  > > > ftp to my server, my server activate the link.
 > >  > > >
 > >  > > > Even if I do a "ftp 192.168.5.1" from my client
 > >  > (192.168.5.2). Has it
 > >  > got
 > >  > > > something to do with dns lookups?
 > >  > >
 > >  > >I suspect so.
 > >  > >
 > >  > > > But I'm using ip addr here, not name.
 > >  > >
 > >  > >It doesn't matter.
 > >  > >
 > >  > > > How
 > >  > > > do I resolve that?
 > >  > >
 > >  > >Did you feed in the .reg file that I sent?
 > >  > >
 > >  > > >
 > >  > > > And what if later I want to use something like
 > >  > "ftp pc1" (pc1 is the
 > >  > > > server), do I have to edit the filter to take into
 > >  > account dns lookup at
 > >  > > > local network?
 > >  > >
 > >  > >No.  It shouldn't matter.
 > >  > >
 > >  > > >
 > >  > > > May I know what is the meaning of the following
 > >  > statements?
 > >  > > >
 > >  > > > ignore udp
 > >  > udp.dest=udp.domain,udp.source=udp.domain
 > >  > > > accept udp 90 udp.dest=udp.domain
 > >  > > > ignore udp udp.source=udp.domain
 > >  > >
 > >  > >This says to bring up the line for a DNS lookup,
 > >  > unless either both the
 > >  > >source is a domain lookup (i.e., a zone transfer is
 > >  > happening, although
 > >  > >most zone transfers happens via TCP, not UDP).
 > >  > >