DHCP and Win7

Héctor Herrera hherreraa at gmail.com
Tue Feb 26 17:07:53 UTC 2013


@Grace: The wired network it works. It has the IP 169.254.150.144. And I'm
sure the cable works properly, when I tried static IP configuration on my
PC and on the server, I can connect the server by SSH.

@Sten: What do you mean by 'Rogue server'?
About the logs, I have only information about listening in eth0. Here's the
log of /var/log/messages:

Feb 26 11:46:42 communication-server kernel: [ 5842.440825] eth0: link down
Feb 26 11:46:54 communication-server kernel: [ 5853.997185] eth0: link up,
100Mbps, full-duplex, lpa 0xCDE1
Feb 26 11:47:47 communication-server kernel: [ 5907.387040] ip_tables: (C)
2000-2006 Netfilter Core Team
Feb 26 11:48:04 communication-server kernel: [ 5923.659054] nf_conntrack
version 0.5.0 (16139 buckets, 64556 max)
Feb 26 11:48:04 communication-server kernel: [ 5923.659917]
CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Please use
Feb 26 11:48:04 communication-server kernel: [ 5923.659922]
nf_conntrack.acct=1 kernel parameter, acct=1 nf_conntrack module option or
Feb 26 11:48:04 communication-server kernel: [ 5923.659925] sysctl
net.netfilter.nf_conntrack_acct=1 to enable it.
Feb 26 12:23:26 communication-server kernel: [ 8045.972235] device eth0
entered promiscuous mode
Feb 26 12:23:36 communication-server kernel: [ 8055.894186] eth0: link down
Feb 26 12:23:41 communication-server kernel: [ 8060.958909] eth0: link up,
100Mbps, full-duplex, lpa 0xCDE1
Feb 26 12:58:15 communication-server kernel: [10134.684416] device eth0
left promiscuous mode


Should I use eth0 on promiscuous mode? I've tried that, but isn't
working... And about the sniffing, my server listens for any DHCP query on
eth0, so I used ngrep -d eth0 (listen all the traffic on eth0), and
nothing...


2013/2/26 Sten Carlsen <stenc at s-carlsen.dk>

>  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 Łukasz Siemiradzki <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
>> ŁS
>>
>>
>> 2013/2/26 Héctor Herrera <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>
>>>
>>>> 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>:
>>>>  > 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";
>>>> > 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 -p tcp -m tcp --dport 80 -j REDIRECT
>>>> > --to-ports 3128
>>>> > -A PREROUTING -s 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>
>>>> >>
>>>> >> 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>
>>>> 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)
>>>> >> >
>>>> >> > _______________________________________________
>>>> >> > dhcp-users mailing list
>>>> >> > dhcp-users at lists.isc.org
>>>> >> > https://lists.isc.org/mailman/listinfo/dhcp-users
>>>> >> _______________________________________________
>>>> >> dhcp-users mailing list
>>>> >> dhcp-users at lists.isc.org
>>>> >> https://lists.isc.org/mailman/listinfo/dhcp-users
>>>> >
>>>> >
>>>> >
>>>> >
>>>> > --
>>>> > 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)
>>>
>>> _______________________________________________
>>> dhcp-users mailing list
>>> dhcp-users at lists.isc.org
>>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>>
>>
>>
>>
>> --
>>
>>  "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)
>
>
> _______________________________________________
> dhcp-users mailing listdhcp-users at lists.isc.orghttps://lists.isc.org/mailman/listinfo/dhcp-users
>
>
> --
> Best regards
>
> Sten Carlsen
>
> No improvements come from shouting:
>
>        "MALE BOVINE MANURE!!!"
>
>
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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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