Re: no DHCP offer

Often when people do what I said previously they will guess at a mac
address that is similar to their own. In the rare event that someone
just happened to pick yours what they are saying can definately occur.
 It could also be that the manufacturer sold multiple PC's with the
same MAC and someone happened to purchase it somehwere near your home.
 Although this isn't supposed to occur it does happen at times. The
probability is very low, so I guess it is your lucky day. :)

On Fri, Jan 29, 2010 at 10:51 AM, ospfv2 <ospfv2_at_gmail.com> wrote:
> ISP told me it could be someone clone client mac address
> the workaround is to change the mac-address
> i did what they told and it works
>
> any explanation ?
>
> On Thu, Jan 28, 2010 at 12:12 AM, Tyson Scott <tscott_at_ipexpert.com> wrote:
>>
>> Many ISP's use some type of Port Security feature to prevent you from
>> plugging in different devices.
>>
>> Either reboot the cable modem or change the MAC on your PC to mimic the
>> last
>> device plugged in... Vuala it will work for you.
>>
>> If that is not the case then contact the ISP. Possibly it is configured
>> for
>> static, thus no DHCP.
>>
>> Regards,
>>
>> Tyson Scott - CCIE #13513 R&S, Security, and SP
>> Technical Instructor - IPexpert, Inc.
>> Mailto: tscott_at_ipexpert.com
>> Telephone: +1.810.326.1444, ext. 208
>> Live Assistance, Please visit: www.ipexpert.com/chat
>> eFax: +1.810.454.0130
>>
>>
>>
>> -----Original Message-----
>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> Sadiq Yakasai
>> Sent: Wednesday, January 27, 2010 11:53 AM
>> To: ospfv2
>> Cc: Cisco certification
>> Subject: Re: no DHCP offer
>>
>> ip helpper address?
>>
>> On Wed, Jan 27, 2010 at 4:28 PM, ospfv2 <ospfv2_at_gmail.com> wrote:
>>
>> > Hi Experts
>> >
>> > when using cable modem, client (winXP pro) doesn't get ip address from
>> DHCP
>> > server.
>> > using wireshark i see no DHCP offer from ISP site. client did send DHCP
>> > discover.
>> >
>> > i believe the problem is on ISP site, i just don't know how to prove
>> > it.
>> > client succesfully get ip from other DHCP servers.
>> >
>> > i wonder why there is no DHCP offer ?
>> >
>> > Rgds
>> >
>> >
>> > Blogs and organic groups at http://www.ccie.net
>> >
>> > _______________________________________________________________________
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>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>> --
>> CCIE #19963
>>
>>
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>>
>> _______________________________________________________________________
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>>
>>
>>
>>
>>
>>
>>
>>
>
>

-- 
Tyson Scott - CCIE #13513 R&S, Security, and SP
Technical Instructor - IPexpert, Inc.
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
Mailto:  tscott_at_ipexpert.com
Blogs and organic groups at http://www.ccie.net