Re: swbell DSL bug ?

[jamie.phillips () NS SYMPATICO CA (J . Phillips)]

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Absolutley,  my DSL provider's DHCP will only assign an IP to the MAC
address on the NIC they provided, and it is always the same internal
IP.  There are however ways to change the burned in address, with
which you could theoretically borrow someone else's IP on the same
subnet, provided they did not have an IP already leased.(or perhaps
even if they do??.)

Jamie

- -----Original Message-----
From: VULN-DEV List [mailto:VULN-DEV () SECURITYFOCUS COM]On Behalf Of
Seth
R Arnold
Sent: May 7, 2000 9:57 PM
To: VULN-DEV () SECURITYFOCUS COM
Subject: Re: swbell DSL bug ?

Ryan, that just means they don't keep good enough track of things --
dhcp servers can be configured to assign leases only for certain
MACs.

* Ryan Sweat <batrox () SWBELL NET> [000507 17:13]:
>      Southwester Bell is a big provider of dsl access in some parts
> of the US.  Dhcp provides an IP address and the lease expires in
> about 72 hours.  They claim the IP cannot be changed, however when
> playing around last night, I found if you install another ethernet
> card, and switch the cable to the new card, it happily gives you
> another IP address.  The dhcp server must rely on mac address when
> providing a lease for an ip.  This could pose many problems.  How
> can accounting be kept when a user can change his ip whenever he
> likes?  I have more testing to do, but I do not see why you couldnt
> install a few nic cards and get ip address for each one, which
> swbell would like to charge you much more money for.  I am looking
> into a way to change the mac address in windows. I know it can be
> done in linux through ifconfig.  Maybe somone has experience in
> this ??
>
> batrox () swbell net

- --
Seth Arnold | http://www.willamette.edu/~sarnold/
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