DHCP and Win7
Sten Carlsen
stenc at s-carlsen.dk
Tue Feb 26 16:36:44 UTC 2013
Just a thought: Rogue DHCP server?
Server logs, will contain info if discover is received.
sniffing at the server to see if any discover packets arrive.
On 26/02/13 16:57, Héctor Herrera wrote:
> I had tested with static. It works. Both cards (in the DHCP server)
> are working fine. And also I tried to catch with a sniffer in the
> network between Win7 and my DHCP server, and I got nothing :(
>
>
> 2013/2/26 ?ukasz Siemiradzki <lukasz.siemiradzki at gmail.com
> <mailto:lukasz.siemiradzki at gmail.com>>
>
> Hello!
> Are you sure that your problem lies on DHCP level? Have you tested
> the connectivity between windows 7 client and the dhcp server
> using static addresses?
> If so and there is connectivity - can you start sniffer (i.e.
> wireshark) on Win7, configure it to listen on an active interface
> and gather data?
> BR
> ?S
>
>
> 2013/2/26 Héctor Herrera <hherreraa at gmail.com
> <mailto:hherreraa at gmail.com>>
>
> Well, I assume the trouble here is Win7. But, why? That's my
> question. I don't understand why Win7 isn't asking the DHCP
> server for an IP address. (Or maybe is the DHCP server the
> trouble? I don't really understand it, that's why isn't so
> clear my question)
>
> I'm trying to collect information in the network between my
> Win7 test machine and the server. The network is dead, I
> haven't received any information. And I'm renewing all the
> connections in Win7 (ipconfig /renew).
>
> BTW, I tried with both ethernet interfaces for the IP
> information (I configured the server on eth0 and eth1),
> without good results. I dunno what else can I do. Do you have
> any ideas?
>
>
> 2013/2/26 Oskar Berggren <oskar.berggren at gmail.com
> <mailto:oskar.berggren at gmail.com>>
>
> You started with "unable to send IP addresses to Win7" but
> with your
> latest info it seems like the proper question is the
> reverse: "why
> can't win7 send DHCP requests to my DHCP server?".
>
> Is Win7 configured to use DHCP?
> If you use wireshark or tcpdump on Win7 and on the DHCP
> server, do you
> see any DHCPDISCOVER from the Win7 machine?
>
> /Oskar
>
>
> 2013/2/26 Héctor Herrera <hherreraa at gmail.com
> <mailto:hherreraa at gmail.com>>:
> > That´s the trouble, I haven't any information about
> Windows 7 asking for an
> > IP to my server.
> >
> > This is my dhcpd.conf. It's really basic because I want,
> first of all, the
> > service working:
> >
> > option domain-name "galatea.cl <http://galatea.cl>";
> > option domain-name-servers 8.8.8.8, 200.62.222.222;
> > option routers 192.168.1.1;
> > default-lease-time 600;
> > max-lease-time 7200;
> > server-identifier 192.168.1.1;
> > #ddns-update-style none;
> > authoritative;
> > log-facility local7;
> >
> > subnet 192.168.1.0 netmask 255.255.255.0 {
> > range 192.168.1.15 192.168.1.100;
> > }
> >
> > I have some rules on iptables too:
> >
> > Generated by iptables-save v1.4.8 on Tue Feb 26 11:48:15
> 2013
> > *nat
> > :PREROUTING ACCEPT [4:312]
> > :POSTROUTING ACCEPT [0:0]
> > :OUTPUT ACCEPT [0:0]
> > -A PREROUTING -s 192.168.0.0/24 <http://192.168.0.0/24>
> -p tcp -m tcp --dport 80 -j REDIRECT
> > --to-ports 3128
> > -A PREROUTING -s 192.168.1.0/24 <http://192.168.1.0/24>
> -p tcp -m tcp --dport 80 -j REDIRECT
> > --to-ports 3128
> > COMMIT
> > # Completed on Tue Feb 26 11:48:15 2013
> > # Generated by iptables-save v1.4.8 on Tue Feb 26
> 11:48:15 2013
> > *filter
> > :INPUT ACCEPT [27:2066]
> > :FORWARD ACCEPT [0:0]
> > :OUTPUT ACCEPT [13:1324]
> > -A INPUT -i eth1 -p tcp -m state --state NEW -m tcp
> --dport 3128 -j ACCEPT
> > COMMIT
> > # Completed on Tue Feb 26 11:48:15 2013
> >
> > I don't have any other information. As I said, the logs
> doesn't show me
> > information about Win7. Oh, and Win7 hasn't active the
> Firewall Service.
> >
> >
> > 2013/2/26 Steven Carr <sjcarr at gmail.com
> <mailto:sjcarr at gmail.com>>
> >>
> >> Can you see the requests coming in to the DHCP server
> from the Windows
> >> 7 client? and can you also perform a packet capture on
> the Windows 7
> >> machine to see if it is receiving the responses from
> the DHCP server.
> >> If you can upload the logs (sanitised) and the packet
> capture then I
> >> can have a look.
> >>
> >> Steve
> >>
> >>
> >> On 26 February 2013 13:10, Héctor Herrera
> <hherreraa at gmail.com <mailto:hherreraa at gmail.com>> wrote:
> >> > Greetings to all!
> >> >
> >> > I have an issue with DHCP and Win7. I'm working with
> Debian 6.0.6, and
> >> > I''m
> >> > trying to mount a DHCP server on it (DHCP ver.
> 4.1.1). But I'm unable to
> >> > send IP addresses to Win7 machines. I tried with
> other OS (specifically
> >> > Arch
> >> > Linux and WinXP), and the server sends IP addresses
> to them, but with
> >> > Win7... I cannot
> >> >
> >> > May someone knows how to handle it? And if it so, can
> someone send some
> >> > information?
> >> >
> >> > Thanks to all!
> >> >
> >> > P.D: Sorry about the English, it isn't my first
> language :P
> >> >
> >> > --
> >> > Saludos
> >> >
> >> > Héctor Herrera Anabalón
> >> > Egresado ICCI UNAP
> >> > Servicio Arquitectura Galatea - Oficina Técnica
> http://www.galatea.cl
> >> > Miembro USoLIX Victoria
> >> > Registered User #548600 (LinuxCounter.net)
> >> >
> >> > _______________________________________________
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> <mailto:dhcp-users at lists.isc.org>
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> >
> >
> >
> >
> > --
> > Saludos
> >
> > Héctor Herrera Anabalón
> > Egresado ICCI UNAP
> > Servicio Arquitectura Galatea - Oficina Técnica
> http://www.galatea.cl
> > Miembro USoLIX Victoria
> > Registered User #548600 (LinuxCounter.net)
> >
> > _______________________________________________
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>
>
>
> --
> Saludos
>
> *Héctor Herrera Anabalón*
> Egresado ICCI UNAP
> Servicio Arquitectura Galatea - Oficina Técnica
> http://www.galatea.cl
> Miembro USoLIX Victoria
> Registered User #548600 (LinuxCounter.net)
>
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>
>
> --
>
> "Omnes homines natura scire desiderant"
> Aristotelis
>
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>
> --
> Saludos
>
> *Héctor Herrera Anabalón*
> Egresado ICCI UNAP
> Servicio Arquitectura Galatea - Oficina Técnica http://www.galatea.cl
> Miembro USoLIX Victoria
> Registered User #548600 (LinuxCounter.net)
>
>
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--
Best regards
Sten Carlsen
No improvements come from shouting:
"MALE BOVINE MANURE!!!"
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