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Re: fqdn, dhclient.conf and networkmanager ?

Hi, 

Monday and I'm still stuck with this. However I'm not giving up, the
thing is that i need this working. There a possible workaround for me
until we get this understood. I'm thinking, dhclient-scripts, that's
what I've used before to manually update the dns's with nsupdate. But
that shouldn't be necessary. 

Anyway, back to my problem again. I have noticed when I'm looking
through the logs from wireshark that when dhclient is used from the
commandline, that it looks like this, 

-------------------------------------------
Source             Destination           Protocol Info
CompalIn_f1:ed:84  Broadcast             ARP      Who has 10.64.0.1?
Tell 10.64.4.89
Source             Destination           Protocol Info
Cisco_31:9c:43     CompalIn_f1:ed:84     ARP      10.64.0.1 is at
00:1e:f6:31:9c:43
Source             Destination           Protocol Info
10.64.4.89         172.16.0.40           DNS      Standard query SOA
nrlx038.dyn.smhi.se
Source             Destination           Protocol Info
172.16.0.40        10.64.4.89            DNS      Standard query
response
Source             Destination           Protocol Info
10.64.4.89         172.16.0.40           DNS      Standard query NS
dyn.smhi.se
Source             Destination           Protocol Info
172.16.0.40        10.64.4.89            DNS      Standard query
response NS adde.ad.smhi.se NS adele.ad.smhi.se NS adrian.ad.smhi.se
Source             Destination           Protocol Info
10.64.4.89         172.16.0.40           DNS      Dynamic update SOA
dyn.smhi.se
-------------------------------------------
Notice the ARP question and the DNS querying. 

This is never done when i use NetworkManager, there is neither an ARP
question or DNS querying. 
Why that is, i have no idea ??


I cannot come to any other conclusion that this is a bug from
NetworkManagers side, I'm feeling like Ive tried everything now and I'm
running empty on suggestion. 

Patrik Martinsson 
ITi
SMHI
Patrik Martinsson smhi se


On Fri, 2008-11-21 at 13:17 +0100, Patrik.Martinsson wrote:
> Hi again,
> 
> I'm still stuck with the same problem, I've now gotten a step deeper and
> started to dig around with strace. Ive also updated to fedora 10 to try
> it out with the latest versions and give you the results from there.
> I have totally disabled IPV6 and do not seem to have any of those
> packets anymore when i look with wireshark. 
> However, i still face the same behavior and my problem remains.  
> 
> I'm attaching parts of the strace logs from the
> successful /sbin/dhclient and the unsuccessful /usr/sbin/NetworkManager,
> and maybe you guys can figure it out why it acts different depending on
> from where its called. 
> 
> Maybe i can raise the question somewhere else to, i have no idea where
> thou ? 
> 
> Suggestions are more then welcome. 
> 
> Patrik Martinsson 
> ITi
> SMHI
> Patrik Martinsson smhi se
> 
> 
> On Wed, 2008-11-19 at 11:39 -0500, Dan Williams wrote:
> > On Wed, 2008-11-19 at 15:49 +0100, Patrik.Martinsson wrote:
> > > On Tue, 2008-11-18 at 11:08 -0500, Dan Williams wrote:
> > > > On Tue, 2008-11-18 at 10:25 +0100, Patrik.Martinsson wrote:
> > > > > Hello all !
> > > > > 
> > > > > I have a question regarding using NetworkManager and
> > dhclient.conf, 
> > > > > maybe i don't understand this right, but however. 
> > > > > 
> > > > > I would like to use NetworkManager but it seems like im not able
> > to
> > > > > apply the same commands to the dhcp server as with dhclient, is
> > > > > NetworkManager using dhclient or does it gets its ip in some
> > other
> > > > > way ? 
> > > > > 
> > > > > I need the same behavior with NetworkManager as a have with
> > dhclient,
> > > > > regarding the options for dynamic update. This is how my
> > dhclient.conf
> > > > > looks today, and i need Networkmanagar to act the same, 
> > > > > 
> > > > > send fqdn.fqdn "hostname.";
> > > > > send fqdn.encoded off;
> > > > > send fqdn.server-update off;
> > > > > append domain-search "foo.bar.com","foo2.bar.com";
> > > > 
> > > > domain-search can be configured in the 'searches' option in the
> > UI,
> > > > either with static or "Automatic (addresses only)".
> > > > 
> > > > So does the DHCP server no honor the send-hostname directive?
> > That may
> > > > be a Microsoft DNS only option, but I was under the impression
> > that the
> > > > ISC dhcp server supported that as well.
> > > > 
> > > > If not, maybe we need to send the other 3 as well, though the
> > comment in
> > > > 'man dhclient.conf' about encoded on/off doesn't sound very
> > promising.
> > > > 
> > > > In the end, you should be able to put these options
> > > > in /etc/dhclient-eth0.conf (or whatever the interface name is) and
> > have
> > > > them merged in by NetworkManager.
> > > > 
> > > > Dan
> > > 
> > > Hello, again !
> > > 
> > > I've spent almost 2 days on this particular problem now, and come up
> > > with some conclusions about whats going on and why it's not behaving
> > > like i want it to. 
> > > 
> > > I take this from beginning again shortly, just so we are on the same
> > > side here. 
> > > My problem is that, when i manually run dhclient from commandline,
> > my
> > > dns server gets updated, BUT when dhclient is invoked from
> > > NetworkManager, my dns server DON'T get updated. 
> > > 
> > > First i thought the problem was that the fqdn options that I've
> > > specified in my dhclient.conf didn't get to the dhclient when it was
> > > invoked by the NetworkManager, this is, (of course i realize now in
> > > after-hand) totally wrong.
> > > 
> > > It doesn't matter if we call it from commandline or trough
> > > NetworkManager, the 
> > > DHCPDISCOVER
> > > DHCPOFFER,
> > > DHCPREQUEST
> > > DHCPACK 
> > > packages looks EXACTLY the same (not timestamps of course, but the
> > > relevant information). Ive checked this with wireshark and compared
> > the
> > > different results with vimdiff. 
> > > They are the same ! Cool, at least the problem isn't there. 
> > > 
> > > However the problem comes after it gets its DHCPACK, when i call
> > > dhclient from the commandline this gets done, logs from wireshark
> > >
> > ---------------------------------------------------------------------
> > > Source      Destination  Protocol Info
> > > XX.XX.X.XX  XXX.XX.X.XX  DNS      Standard query SOA
> > myhostname.foo.bar
> > > 
> > > Source      Destination  Protocol Info
> > > XXX.XX.X.XX XX.XX.X.XX   DNS      Standard query response
> > > 
> > > Source      Destination  Protocol Info
> > > XX.XX.X.XX  XXX.XX.X.XX  DNS      Standard query NS foo.bar
> > > 
> > > Source      Destination  Protocol Info
> > > XXX.XX.X.XX XX.XX.X.XX   DNS      Standard query response NS
> > > dns1.foo.bar dns2.foo.bar dns3.foo.bar 
> > > 
> > > Source      Destination  Protocol Info
> > > XX.XX.X.XX  XXX.XX.X.XX  DNS      Dynamic update SOA foo.bar
> > >
> > ----------------------------------------------------------------------
> > > and my dns, as i stated earlier gets updated correctly. 
> > > 
> > > 
> > > BUT, if invoked from the NetworkManager, this is what gets done, 
> > >
> > ----------------------------------------------------------------------
> > > Source      Destination  Protocol Info
> > > XX.XX.X.XX  XXX.XX.X.XX  DNS      Standard query AAAA dns3.foo.bar
> > > 
> > > Source      Destination  Protocol Info
> > > XXX.XX.X.XX XX.XX.X.XX   DNS      Standard query response
> > > 
> > > Source      Destination  Protocol Info
> > > XX.XX.X.XX  XXX.XX.X.XX  DNS      Standard query AAAA
> > > dns3.foo.bar.foo.bar (No typo here) 
> > > 
> > > Source      Destination  Protocol Info
> > > XXX.XX.X.XX XX.XX.X.XX   DNS      Standard query response, No such
> > name
> > >
> > -----------------------------------------------------------------------
> > > And this is not right. For some reason it tries with some IPV6
> > query's?
> > > and everything gets wrong, if i understand these logs right ? 
> > 
> > Looks like IPv6, yes, but NM doesn't explicitly do anything with IPv6,
> > and there's a completely separate IPv6 DHCP client called dhcp6.  What
> > options are you invoking dhclient with manually?  -4 perhaps?
> > 
> > We may want to force -4 anyway, because we'll have completely separate
> > support for IPv6 later using dhcp6.
> > 
> > Dan
> > 
> > > Ive followed what i found about turning IPV6 off, i don't have such
> > a
> > > interface, modules aren't loaded and i have this in
> > > my /etc/syconfig/network 
> > > NETWORK_IPV6=NO 
> > > and in my /etc/sysconfig/network-scritps/ifcfg-eth0
> > > IPV6INIT=no
> > > IPV6_AUTOCONF=no
> > > 
> > > NetworkManager does something with something to make it behave like
> > > this, i have no idea why IPV6 is in the picture. 
> > > Or maybe I'm totally off here ? What do guys think ? 
> > > 
> > > Ive looked around a bit and found this document about IPV6
> > > http://v6fix.net/docs/wide-draft-v6fix.en
> > > where they quite in the beginning have an intersting point that
> > could
> > > have something to do with this. 
> > > 
> > > 1.2.1 Looking up DNS with a given name
> > > 
> > >     When an application can use both IPv4 and IPv6, it should
> > resolve
> > >     both A RR and AAAA RR with a given name.
> > > 
> > >     A mis-implemented resolver resolves AAAA RR even if IPv6 is not
> > >     available. (Since IPv6 cannot be used, the resolution of AAAA RR
> > is
> > >     wasting. Also it gives chances to make mistakes to
> > applications.)
> > > 
> > >     The cause of this problem can be found in the DNS server side.
> > For
> > >     instance, when a query of AAAA RR is received, the DNS server
> > >     replies with a wrong answer.
> > > 
> > > 
> > > 
> > > Any suggestions, tips, advices are welcome, I'm really trying to
> > figure
> > > this out. 
> > > 
> > > Best regards,
> > > Patrik Martinsson, Sweden.
> > > 
> > > 
> > > 
> > 
> > 
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