'Re: dhclient with alias IP addresses?'

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List:       dhcp-client
Subject:    Re: dhclient with alias IP addresses?
From:       Anthony Ewell <aewell () gbis ! com>
Date:       2001-09-04 1:22:19
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Hi Matthew,

    Well, there goes that idea.

    I was hoping you were going to say 255.255.255.252 (FF.FF.FF.FC).
That would have meant that your ISP misunderstood there equipment
and that your other six address were actually fixed addresses.

   I had to deal with a few ISP's that routinely assigned ff.ff.ff.fc
as a mask and assigned 7 addresses to each DSL user.  They next to
called me an idiot when I asked for a single, dynamic IP.
(I didn't have the heart to tell them that my ISP routinely
gives out dynamic IP's to its DSL accounts and yes it was possible.
3.00 U$D cheaper per month too.)

   I think you are going to have to come up with a way to temporarily
stick your other computers directly on the internet when you want
to game.  (Do not forget to firewall each unit!)

Good luck,
--Tony


Matthew Hagerty wrote:

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> 
> 
> It is kind of screwy, but this is what they told me: 255.255.254.0
> 
> It works...
> 
> Matthew
> 
> At 12:03 PM 9/3/2001 -0700, you wrote:
> 
>>   *** From dhcp-client -- To unsubscribe, see the end of this message. ***
>>
>>
>>Hi Matt,
>>
>>    I am stumped.
>>
>>    Just out of curiosity, what is your subnet mask on
>>your static IP?
>>
>>--Tony
>>
>>
>>
>>Matthew Hagerty wrote:
>>
>>
>>>   *** From dhcp-client -- To unsubscribe, see the end of this message. ***
>>>
>>>
>>>Tony,
>>>
>>>Sure thing.  Basically I have a cable modem that plugs into a dual-homed
>>>router machine running FreeBSD.  This machine is currently running NATd 
>>>
>>and
>>
>>>acts as the gateway for my internal network.  The second NIC card plugs
>>>into my hub, as do my workstations and internal servers.  It is all 
>>>
>>running
>>
>>>fine, the addresses on the router are currently manually configured since
>>>my ISP gives their business class customers a static IP (boy do I feel
>>>*privileged*!! <smirk>), and the internal address is a non-routable
>>>(10.x.x.x) static IP as well.
>>>
>>>What I would like to do is this.  I am *allowed* 6 dynamic IP addresses as
>>>well as my 1 static IP,   and since the router box is the only machine
>>>connected to the cable modem side of things, it is this machine that I 
>>>
>>need
>>
>>>to use to grab the 6 dynamic addresses.  If I run dhclient on the external
>>>interface of my router it works fine, but I lose my static IP
>>>address.  Also, I only get one IP.  So, I'm looking for a way to use
>>>dhclient to assign 1 or more dynamic IP addresses to the external 
>>>
>>interface
>>
>>>without interfering with the static IP configuration or the 
>>>
>>routing.  These
>>
>>>additional addresses should be added as alias addresses to the external
>>>interface, basically just another IP that the machine will respond to.  I
>>>know how to do this manually when static IP addresses are being used, 
>>>
>>but I
>>
>>>have no idea how I might do this with dhclient.  I had a look through the
>>>dhclient script and read the dhclient.conf man page, but I'm still not 
>>>
>>sure
>>
>>>exactly what is going on in there.
>>>
>>>The reason for needing the additional IP addresses is two fold.  First, I
>>>can do a 1 to 1 NATd mapping to an internal machine, if needed, to use
>>>certain programs that don't like NATd or Firewalls, i.e. Netmeeing and
>>>other video conference software, etc.  The other reason is, well, uhm,
>>>games <grin>.  A couple of times each month I host a game session and we
>>>play online.  One of the games we play won't allow more than 4 connections
>>>from the same IP address, so we are out of luck with 5 or more players.  I
>>>know, I know, it seems like a sorry reason, but it's nice to have a little
>>>fun once in a while, and the socialization is great!  Anyway, being 
>>>
>>able to
>>
>>>grab just one or two more dynamic IPs in addition to my static IP would 
>>>
>>fit
>>
>>>the bill nicely.
>>>
>>>Thanks,
>>>Matthew
>>>
>>>At 10:09 AM 8/31/2001 -0700, Anthony Ewell wrote:
>>>
>>>
>>>>  *** From dhcp-client -- To unsubscribe, see the end of this message. ***
>>>>
>>>>
>>>>Hi Matthew,
>>>>
>>>>   What is it you are trying to do with the six dynamic IP addresses?
>>>>Do you want to run six additional computers off your cable modem?
>>>>Would you describe your topology in a little greater detail to help
>>>>us understand what your desired end product is suppose to be?
>>>>
>>>>Many thanks,
>>>>--Tony
>>>>
>>>>
>>>>
>>>>Matthew Hagerty wrote:
>>>>
>>>>
>>>>
>>>>>  *** From dhcp-client -- To unsubscribe, see the end of this 
>>>>>
>>message. ***
>>
>>>>>Greetings,
>>>>>
>>>>>I have a cable modem connected to a gateway box (running FreeBSD-4.3 and
>>>>>NATd) and one assigned static IP address, however I am allowed an
>>>>>additional 6 dynamic IP addresses.  My cable provider uses DHCP to
>>>>>configure the additional IP addresses and I was wondering if anyone could
>>>>>give me some insight as to how I might use dhclient to assign more dynamic
>>>>>IPs to my interface without disturbing the manually configured static
>>>>>IP?  I am familiar with adding alias addresses to the interface 
>>>>>
>>manually in
>>
>>>>>the rc.conf, but not via dhclient.  Any assistance would be greatly
>>>>>appreciated.
>>>>>
>>>>>Thank you,
>>>>>Matthew
>>>>>
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>>>
>>>
>>>
>>>
>>>
>>
>>--
>>-------------------------
>>I Fish.  Therefore, I am.
>>-------------------------
>>
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-- 
-------------------------
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