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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'>We are using the spawn configuration, but allowing two IP addresses
each. I see a second IP address for 6.2% of our population. For
that volume, it’s worth the savings in helpdesk calls.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'>That said, I would welcome using “option matching"
once I can upgrade to that version.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'>Frank<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
dhcp-users-bounces+frnkblk=iname.com@lists.isc.org
[mailto:dhcp-users-bounces+frnkblk=iname.com@lists.isc.org] <b>On Behalf Of </b>Marc
Perea<br>
<b>Sent:</b> Thursday, March 11, 2010 9:48 AM<br>
<b>To:</b> dhcp-users@lists.isc.org<br>
<b>Subject:</b> Re: Option 82 & limit lease 1<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Hi Terry,<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>we also map a
specific public address to each individual port in an ISP environment. We've
had no calls from subscribers who aren't able to get a DHCP assignment, but
plenty of calls when we swap the customer modem since the lease is tied to the
MAC address instead of the option 82 info. We get plenty of calls related to
BRAS trouble, but that's fuel for a different list discussion.<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>What's the reason
that you're finding no lease is available for a particular subscriber? I don't
understand how that scenario is occurring and would like to help if I can, but
in our environment as long as the same MAC asks for DHCP from the same location
(agent.circuit-id), it always gets the same IP and we only see no free lease
errors when a customer is trying to bridge to us instead of using our
residential gateway. What is the situation that causes your need to worry about
freeing the lease?<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>What I would worry
about using option 1 is, let's consider that you did have a customer bridge and
the first device grabs the IP for the circuit and ties its MAC to DHCP. Then,
another device on the customer LAN asks for DHCP, and your scheme as outlined
would turn off service from the server perspective for the first MAC by
freeing the lease and potentially let the second device get the lease
(depending on how you use omshell), at which point you'd have duplicate IPs on
the customer equipment and an inconsistent lease.<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>In our scenario, we
just deny any device beyond the first that asks for DHCP, so we should still
get a call - at which point we tell the customer to install our RG and we run
the clear lease process while the customer is on the phone and hooking it up
correctly. Otherwise, at least one of the customer devices will work and we'll
have a valid record of the lease for it.<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Of your 3 ideas, I
would definitely stick with option 1, but I am still curious what this process
will "fix" for you? I get the impression that 2) won't work
because of the way the server handles DISCOVER errors, and I agree that 3) is a
poor choice.<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>I'm still getting to
the 4.2 environment in our lab, but we have high hopes.<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>In your config, you
are using spawn with option agent.remote-id. Is there any particular reason for
doing so?<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Cheers!<o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>--Marc<o:p></o:p></span></p>
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